├── LivelyGIFs.xcodeproj
    ├── project.pbxproj
    ├── project.xcworkspace
    │   ├── contents.xcworkspacedata
    │   └── xcuserdata
    │   │   └── XueYu.xcuserdatad
    │   │       └── UserInterfaceState.xcuserstate
    └── xcuserdata
    │   └── XueYu.xcuserdatad
    │       ├── xcdebugger
    │           └── Breakpoints_v2.xcbkptlist
    │       └── xcschemes
    │           ├── LivelyGIFs.xcscheme
    │           └── xcschememanagement.plist
├── LivelyGIFs
    ├── AppDelegate.swift
    ├── Assets.xcassets
    │   └── AppIcon.appiconset
    │   │   └── Contents.json
    ├── Base.lproj
    │   ├── LaunchScreen.storyboard
    │   └── Main.storyboard
    ├── GifExt.swift
    ├── Info.plist
    ├── LivePhotoVC.swift
    ├── PhotoCollectionVC.swift
    ├── PhotoCollectionViewCell.swift
    └── Regift.swift
├── ReadMe.md
└── demo.gif


/LivelyGIFs.xcodeproj/project.pbxproj:
--------------------------------------------------------------------------------
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8 | 


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55 |          runnableDebuggingMode = "0">
56 |          <BuildableReference
57 |             BuildableIdentifier = "primary"
58 |             BlueprintIdentifier = "C80883441E940D1B00939B75"
59 |             BuildableName = "LivelyGIFs.app"
60 |             BlueprintName = "LivelyGIFs"
61 |             ReferencedContainer = "container:LivelyGIFs.xcodeproj">
62 |          </BuildableReference>
63 |       </BuildableProductRunnable>
64 |       <AdditionalOptions>
65 |       </AdditionalOptions>
66 |    </LaunchAction>
67 |    <ProfileAction
68 |       buildConfiguration = "Release"
69 |       shouldUseLaunchSchemeArgsEnv = "YES"
70 |       savedToolIdentifier = ""
71 |       useCustomWorkingDirectory = "NO"
72 |       debugDocumentVersioning = "YES">
73 |       <BuildableProductRunnable
74 |          runnableDebuggingMode = "0">
75 |          <BuildableReference
76 |             BuildableIdentifier = "primary"
77 |             BlueprintIdentifier = "C80883441E940D1B00939B75"
78 |             BuildableName = "LivelyGIFs.app"
79 |             BlueprintName = "LivelyGIFs"
80 |             ReferencedContainer = "container:LivelyGIFs.xcodeproj">
81 |          </BuildableReference>
82 |       </BuildableProductRunnable>
83 |    </ProfileAction>
84 |    <AnalyzeAction
85 |       buildConfiguration = "Debug">
86 |    </AnalyzeAction>
87 |    <ArchiveAction
88 |       buildConfiguration = "Release"
89 |       revealArchiveInOrganizer = "YES">
90 |    </ArchiveAction>
91 | </Scheme>
92 | 


--------------------------------------------------------------------------------
/LivelyGIFs.xcodeproj/xcuserdata/XueYu.xcuserdatad/xcschemes/xcschememanagement.plist:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>SchemeUserState</key>
 6 | 	<dict>
 7 | 		<key>LivelyGIFs.xcscheme</key>
 8 | 		<dict>
 9 | 			<key>orderHint</key>
10 | 			<integer>0</integer>
11 | 		</dict>
12 | 	</dict>
13 | 	<key>SuppressBuildableAutocreation</key>
14 | 	<dict>
15 | 		<key>C80883441E940D1B00939B75</key>
16 | 		<dict>
17 | 			<key>primary</key>
18 | 			<true/>
19 | 		</dict>
20 | 	</dict>
21 | </dict>
22 | </plist>
23 | 


--------------------------------------------------------------------------------
/LivelyGIFs/AppDelegate.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  AppDelegate.swift
 3 | //  LivelyGIFs
 4 | //
 5 | //  Created by Xue Yu on 4/4/17.
 6 | //  Copyright © 2017 XueYu. All rights reserved.
 7 | //
 8 | 
 9 | import UIKit
10 | 
11 | @UIApplicationMain
12 | class AppDelegate: UIResponder, UIApplicationDelegate {
13 | 
14 |     var window: UIWindow?
15 | 
16 | 
17 |     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
18 |         // Override point for customization after application launch.
19 |         return true
20 |     }
21 | 
22 |     func applicationWillResignActive(_ application: UIApplication) {
23 |         // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
24 |         // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
25 |     }
26 | 
27 |     func applicationDidEnterBackground(_ application: UIApplication) {
28 |         // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
29 |         // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
30 |     }
31 | 
32 |     func applicationWillEnterForeground(_ application: UIApplication) {
33 |         // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
34 |     }
35 | 
36 |     func applicationDidBecomeActive(_ application: UIApplication) {
37 |         // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
38 |     }
39 | 
40 |     func applicationWillTerminate(_ application: UIApplication) {
41 |         // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
42 |     }
43 | 
44 | 
45 | }
46 | 
47 | 


--------------------------------------------------------------------------------
/LivelyGIFs/Assets.xcassets/AppIcon.appiconset/Contents.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "images" : [
 3 |     {
 4 |       "idiom" : "iphone",
 5 |       "size" : "20x20",
 6 |       "scale" : "2x"
 7 |     },
 8 |     {
 9 |       "idiom" : "iphone",
10 |       "size" : "20x20",
11 |       "scale" : "3x"
12 |     },
13 |     {
14 |       "idiom" : "iphone",
15 |       "size" : "29x29",
16 |       "scale" : "2x"
17 |     },
18 |     {
19 |       "idiom" : "iphone",
20 |       "size" : "29x29",
21 |       "scale" : "3x"
22 |     },
23 |     {
24 |       "idiom" : "iphone",
25 |       "size" : "40x40",
26 |       "scale" : "2x"
27 |     },
28 |     {
29 |       "idiom" : "iphone",
30 |       "size" : "40x40",
31 |       "scale" : "3x"
32 |     },
33 |     {
34 |       "idiom" : "iphone",
35 |       "size" : "60x60",
36 |       "scale" : "2x"
37 |     },
38 |     {
39 |       "idiom" : "iphone",
40 |       "size" : "60x60",
41 |       "scale" : "3x"
42 |     },
43 |     {
44 |       "idiom" : "ipad",
45 |       "size" : "20x20",
46 |       "scale" : "1x"
47 |     },
48 |     {
49 |       "idiom" : "ipad",
50 |       "size" : "20x20",
51 |       "scale" : "2x"
52 |     },
53 |     {
54 |       "idiom" : "ipad",
55 |       "size" : "29x29",
56 |       "scale" : "1x"
57 |     },
58 |     {
59 |       "idiom" : "ipad",
60 |       "size" : "29x29",
61 |       "scale" : "2x"
62 |     },
63 |     {
64 |       "idiom" : "ipad",
65 |       "size" : "40x40",
66 |       "scale" : "1x"
67 |     },
68 |     {
69 |       "idiom" : "ipad",
70 |       "size" : "40x40",
71 |       "scale" : "2x"
72 |     },
73 |     {
74 |       "idiom" : "ipad",
75 |       "size" : "76x76",
76 |       "scale" : "1x"
77 |     },
78 |     {
79 |       "idiom" : "ipad",
80 |       "size" : "76x76",
81 |       "scale" : "2x"
82 |     },
83 |     {
84 |       "idiom" : "ipad",
85 |       "size" : "83.5x83.5",
86 |       "scale" : "2x"
87 |     }
88 |   ],
89 |   "info" : {
90 |     "version" : 1,
91 |     "author" : "xcode"
92 |   }
93 | }


--------------------------------------------------------------------------------
/LivelyGIFs/Base.lproj/LaunchScreen.storyboard:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="11134" systemVersion="15F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
 3 |     <dependencies>
 4 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="11106"/>
 5 |         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
 6 |     </dependencies>
 7 |     <scenes>
 8 |         <!--View Controller-->
 9 |         <scene sceneID="EHf-IW-A2E">
10 |             <objects>
11 |                 <viewController id="01J-lp-oVM" sceneMemberID="viewController">
12 |                     <layoutGuides>
13 |                         <viewControllerLayoutGuide type="top" id="Llm-lL-Icb"/>
14 |                         <viewControllerLayoutGuide type="bottom" id="xb3-aO-Qok"/>
15 |                     </layoutGuides>
16 |                     <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
17 |                         <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
18 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
19 |                         <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
20 |                     </view>
21 |                 </viewController>
22 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
23 |             </objects>
24 |             <point key="canvasLocation" x="53" y="375"/>
25 |         </scene>
26 |     </scenes>
27 | </document>
28 | 


--------------------------------------------------------------------------------
/LivelyGIFs/Base.lproj/Main.storyboard:
--------------------------------------------------------------------------------
  1 | <?xml version="1.0" encoding="UTF-8"?>
  2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="12118" systemVersion="16E195" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="0d4-Ep-498">
  3 |     <device id="retina4_7" orientation="portrait">
  4 |         <adaptation id="fullscreen"/>
  5 |     </device>
  6 |     <dependencies>
  7 |         <deployment identifier="iOS"/>
  8 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="12086"/>
  9 |         <capability name="Constraints to layout margins" minToolsVersion="6.0"/>
 10 |         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
 11 |     </dependencies>
 12 |     <scenes>
 13 |         <!--Live Photos-->
 14 |         <scene sceneID="1U8-Ew-TSr">
 15 |             <objects>
 16 |                 <collectionViewController id="oyN-qR-5iK" customClass="PhotoCollectionVC" customModule="LivelyGIFs" customModuleProvider="target" sceneMemberID="viewController">
 17 |                     <collectionView key="view" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" dataMode="prototypes" id="JP5-2k-scD">
 18 |                         <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
 19 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
 20 |                         <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
 21 |                         <collectionViewFlowLayout key="collectionViewLayout" minimumLineSpacing="10" minimumInteritemSpacing="10" id="Pdg-97-nQT">
 22 |                             <size key="itemSize" width="110" height="105"/>
 23 |                             <size key="headerReferenceSize" width="0.0" height="0.0"/>
 24 |                             <size key="footerReferenceSize" width="0.0" height="0.0"/>
 25 |                             <inset key="sectionInset" minX="0.0" minY="0.0" maxX="0.0" maxY="0.0"/>
 26 |                         </collectionViewFlowLayout>
 27 |                         <cells>
 28 |                             <collectionViewCell opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" reuseIdentifier="Cell" id="3IB-lI-guW" customClass="PhotoCollectionViewCell" customModule="LivelyGIFs" customModuleProvider="target">
 29 |                                 <rect key="frame" x="0.0" y="0.0" width="110" height="105"/>
 30 |                                 <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
 31 |                                 <view key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center">
 32 |                                     <rect key="frame" x="0.0" y="0.0" width="110" height="105"/>
 33 |                                     <autoresizingMask key="autoresizingMask"/>
 34 |                                     <subviews>
 35 |                                         <imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="Vir-37-3tt">
 36 |                                             <rect key="frame" x="0.0" y="-3" width="110" height="108"/>
 37 |                                             <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
 38 |                                         </imageView>
 39 |                                     </subviews>
 40 |                                 </view>
 41 |                                 <connections>
 42 |                                     <outlet property="photoImageView" destination="Vir-37-3tt" id="zJp-HQ-fzo"/>
 43 |                                     <segue destination="UUH-RO-AOl" kind="show" id="yik-aA-DEG"/>
 44 |                                 </connections>
 45 |                             </collectionViewCell>
 46 |                         </cells>
 47 |                         <connections>
 48 |                             <outlet property="dataSource" destination="oyN-qR-5iK" id="OcC-LF-ugT"/>
 49 |                             <outlet property="delegate" destination="oyN-qR-5iK" id="zBB-Bi-LF6"/>
 50 |                         </connections>
 51 |                     </collectionView>
 52 |                     <navigationItem key="navigationItem" title="Live Photos" id="9Is-VD-zXj"/>
 53 |                 </collectionViewController>
 54 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="Oi1-lD-8Sv" userLabel="First Responder" sceneMemberID="firstResponder"/>
 55 |             </objects>
 56 |             <point key="canvasLocation" x="1076" y="95.802098950524751"/>
 57 |         </scene>
 58 |         <!--Live PhotoVC-->
 59 |         <scene sceneID="1OU-q0-3ab">
 60 |             <objects>
 61 |                 <viewController id="UUH-RO-AOl" customClass="LivePhotoVC" customModule="LivelyGIFs" customModuleProvider="target" sceneMemberID="viewController">
 62 |                     <layoutGuides>
 63 |                         <viewControllerLayoutGuide type="top" id="22j-ox-MBa"/>
 64 |                         <viewControllerLayoutGuide type="bottom" id="BzO-C7-RJj"/>
 65 |                     </layoutGuides>
 66 |                     <view key="view" contentMode="scaleToFill" id="Wvc-iN-hcc">
 67 |                         <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
 68 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
 69 |                         <subviews>
 70 |                             <segmentedControl opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="top" segmentControlStyle="plain" selectedSegmentIndex="0" translatesAutoresizingMaskIntoConstraints="NO" id="P1r-he-1J4">
 71 |                                 <rect key="frame" x="16" y="104" width="343" height="29"/>
 72 |                                 <segments>
 73 |                                     <segment title="Small"/>
 74 |                                     <segment title="Medium"/>
 75 |                                     <segment title="Large"/>
 76 |                                 </segments>
 77 |                                 <connections>
 78 |                                     <action selector="segmentedControlClicked:" destination="UUH-RO-AOl" eventType="valueChanged" id="6Wi-aV-dE6"/>
 79 |                                 </connections>
 80 |                             </segmentedControl>
 81 |                             <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="fZE-cZ-nWL">
 82 |                                 <rect key="frame" x="66" y="557" width="240" height="60"/>
 83 |                                 <color key="backgroundColor" red="0.90196079019999997" green="0.90196079019999997" blue="0.90196079019999997" alpha="1" colorSpace="calibratedRGB"/>
 84 |                                 <constraints>
 85 |                                     <constraint firstAttribute="height" constant="60" id="fQM-OL-RPC"/>
 86 |                                     <constraint firstAttribute="width" constant="240" id="zuk-6c-hsi"/>
 87 |                                 </constraints>
 88 |                                 <fontDescription key="fontDescription" style="UICTFontTextStyleHeadline"/>
 89 |                                 <state key="normal" title="Export GIF"/>
 90 |                                 <userDefinedRuntimeAttributes>
 91 |                                     <userDefinedRuntimeAttribute type="string" keyPath="layer.cornerRadius" value="10"/>
 92 |                                 </userDefinedRuntimeAttributes>
 93 |                                 <connections>
 94 |                                     <action selector="exportShareButton:" destination="UUH-RO-AOl" eventType="touchUpInside" id="lVu-WP-Mab"/>
 95 |                                 </connections>
 96 |                             </button>
 97 |                         </subviews>
 98 |                         <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
 99 |                         <constraints>
100 |                             <constraint firstItem="P1r-he-1J4" firstAttribute="top" secondItem="22j-ox-MBa" secondAttribute="bottom" constant="40" id="Zit-cS-hwb"/>
101 |                             <constraint firstItem="BzO-C7-RJj" firstAttribute="top" secondItem="fZE-cZ-nWL" secondAttribute="bottom" constant="50" id="anu-z7-Qla"/>
102 |                             <constraint firstItem="P1r-he-1J4" firstAttribute="leading" secondItem="Wvc-iN-hcc" secondAttribute="leadingMargin" id="da4-aq-G3d"/>
103 |                             <constraint firstItem="P1r-he-1J4" firstAttribute="trailing" secondItem="Wvc-iN-hcc" secondAttribute="trailingMargin" id="geA-nd-eAh"/>
104 |                             <constraint firstItem="fZE-cZ-nWL" firstAttribute="leading" secondItem="Wvc-iN-hcc" secondAttribute="leadingMargin" constant="50" id="qU2-xC-W8b"/>
105 |                         </constraints>
106 |                     </view>
107 |                     <connections>
108 |                         <outlet property="exportShareButton" destination="fZE-cZ-nWL" id="JMN-b7-cxX"/>
109 |                         <outlet property="gifSizeSegmentedControl" destination="P1r-he-1J4" id="G5I-HQ-w1j"/>
110 |                     </connections>
111 |                 </viewController>
112 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="3c7-Cs-bMb" userLabel="First Responder" sceneMemberID="firstResponder"/>
113 |             </objects>
114 |             <point key="canvasLocation" x="1941.5999999999999" y="95.802098950524751"/>
115 |         </scene>
116 |         <!--Navigation Controller-->
117 |         <scene sceneID="9hc-Pc-iZj">
118 |             <objects>
119 |                 <navigationController automaticallyAdjustsScrollViewInsets="NO" id="0d4-Ep-498" sceneMemberID="viewController">
120 |                     <toolbarItems/>
121 |                     <navigationBar key="navigationBar" contentMode="scaleToFill" id="3x9-R3-S9O">
122 |                         <rect key="frame" x="0.0" y="0.0" width="375" height="44"/>
123 |                         <autoresizingMask key="autoresizingMask"/>
124 |                     </navigationBar>
125 |                     <nil name="viewControllers"/>
126 |                     <connections>
127 |                         <segue destination="oyN-qR-5iK" kind="relationship" relationship="rootViewController" id="iQe-3P-asf"/>
128 |                     </connections>
129 |                 </navigationController>
130 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="01B-gJ-zaq" userLabel="First Responder" sceneMemberID="firstResponder"/>
131 |             </objects>
132 |             <point key="canvasLocation" x="136.80000000000001" y="95.802098950524751"/>
133 |         </scene>
134 |     </scenes>
135 | </document>
136 | 


--------------------------------------------------------------------------------
/LivelyGIFs/GifExt.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  GifExt.swift
 3 | //  GifExtDemo
 4 | //
 5 | //  Created by Xue Yu on 4/2/17.
 6 | //  Copyright © 2017 XueYu. All rights reserved.
 7 | //
 8 | 
 9 | 
10 | import UIKit
11 | import ImageIO
12 | import MobileCoreServices
13 | 
14 | extension UIImageView{
15 |     
16 |     public func loadGif(data: Data){
17 |         DispatchQueue.global().async {
18 |             let image = UIImage.gif(data: data)
19 |             DispatchQueue.main.async {
20 |                 self.image = image
21 |             }
22 |         }
23 |     }
24 |     
25 |     public func loadGif(url: URL){
26 |         DispatchQueue.global().async {
27 |             let image = UIImage.gif(url: url)
28 |             DispatchQueue.main.async {
29 |                 self.image = image
30 |             }
31 |         }
32 |     }
33 |     
34 | }
35 | 
36 | extension UIImage{
37 |     
38 |     public class func gif(data: Data) -> UIImage?{
39 |         // Create source from data
40 |         guard let source = CGImageSourceCreateWithData(data as CFData, nil) else{
41 |             print("GifExt: Source for the image doesnot exist")
42 |             return nil
43 |         }
44 |         
45 |         return UIImage.animatedImageWithSource(source)
46 |     }
47 |     
48 |     public class func gif(url: URL) -> UIImage?{
49 |         guard let imageData = try? Data(contentsOf: url) else {
50 |             print("GifExt: Cannot turn image named \"\(url)\" into NSData")
51 |             return nil
52 |         }
53 |         return gif(data: imageData)
54 |     }
55 |     
56 |     internal class func animatedImageWithSource(_ source: CGImageSource) -> UIImage?{
57 |         
58 |         // kCGImageSourceShouldCache: decode or not when storing
59 |         // kCGImageSourceTypeIdentifierHint:  source type
60 |         
61 |         let options: NSDictionary = [kCGImageSourceShouldCache as String: NSNumber(value: true), kCGImageSourceTypeIdentifierHint as String: kUTTypeGIF]
62 |         
63 |         let frameCount = CGImageSourceGetCount(source)
64 |         var images = [UIImage]()
65 |         var gifDuration = 0.0
66 |         
67 |         for i in 0..<frameCount{
68 |             guard let imageRef = CGImageSourceCreateImageAtIndex(source, i, options) else{
69 |                 print("GifExt: something wrong while get a frame of the gif")
70 |                 return nil
71 |             }
72 |             
73 |             guard let properties = CGImageSourceCopyPropertiesAtIndex(source, i, options), let gifInfo = (properties as NSDictionary)[kCGImagePropertyGIFDictionary as String] as? NSDictionary,  let frameDuration = (gifInfo[kCGImagePropertyGIFDelayTime as String] as? NSNumber) else{
74 |                 print("GifExt: something wrong while get the info of the gif")
75 |                 return nil
76 |             }
77 |             
78 |             gifDuration += frameDuration.doubleValue
79 |             let image = UIImage(cgImage: imageRef)
80 |             images.append(image)
81 |         }
82 |         
83 |         let animation = UIImage.animatedImage(with: images, duration: gifDuration)
84 |         return animation
85 |     }
86 | }
87 | 
88 | 


--------------------------------------------------------------------------------
/LivelyGIFs/Info.plist:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>CFBundleDevelopmentRegion</key>
 6 | 	<string>en</string>
 7 | 	<key>CFBundleExecutable</key>
 8 | 	<string>$(EXECUTABLE_NAME)</string>
 9 | 	<key>CFBundleIdentifier</key>
10 | 	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
11 | 	<key>CFBundleInfoDictionaryVersion</key>
12 | 	<string>6.0</string>
13 | 	<key>CFBundleName</key>
14 | 	<string>$(PRODUCT_NAME)</string>
15 | 	<key>CFBundlePackageType</key>
16 | 	<string>APPL</string>
17 | 	<key>CFBundleShortVersionString</key>
18 | 	<string>1.0</string>
19 | 	<key>CFBundleVersion</key>
20 | 	<string>1</string>
21 | 	<key>LSRequiresIPhoneOS</key>
22 | 	<true/>
23 | 	<key>UILaunchStoryboardName</key>
24 | 	<string>LaunchScreen</string>
25 | 	<key>UIMainStoryboardFile</key>
26 | 	<string>Main</string>
27 | 	<key>UIRequiredDeviceCapabilities</key>
28 | 	<array>
29 | 		<string>armv7</string>
30 | 	</array>
31 | 	<key>UISupportedInterfaceOrientations</key>
32 | 	<array>
33 | 		<string>UIInterfaceOrientationPortrait</string>
34 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
35 | 		<string>UIInterfaceOrientationLandscapeRight</string>
36 | 	</array>
37 | 	<key>UISupportedInterfaceOrientations~ipad</key>
38 | 	<array>
39 | 		<string>UIInterfaceOrientationPortrait</string>
40 | 		<string>UIInterfaceOrientationPortraitUpsideDown</string>
41 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
42 | 		<string>UIInterfaceOrientationLandscapeRight</string>
43 | 	</array>
44 | 	<key>NSPhotoLibraryUsageDescription</key>
45 | 	<string>access live photos</string>
46 | </dict>
47 | </plist>
48 | 


--------------------------------------------------------------------------------
/LivelyGIFs/LivePhotoVC.swift:
--------------------------------------------------------------------------------
  1 | //
  2 | //  LivePhotoVC.swift
  3 | //  LivelyGIFs
  4 | //
  5 | //  Created by Xue Yu on 4/4/17.
  6 | //  Copyright © 2017 XueYu. All rights reserved.
  7 | //
  8 | 
  9 | import UIKit
 10 | import Photos
 11 | import PhotosUI
 12 | import MobileCoreServices
 13 | 
 14 | class LivePhotoVC: UIViewController {
 15 |     
 16 |     var livePhotoAsset: PHAsset?
 17 |     var photoView: PHLivePhotoView!
 18 |     var gifView: UIImageView!
 19 |     var gifURL: URL?
 20 |     @IBOutlet weak var exportShareButton: UIButton!
 21 |     @IBOutlet weak var gifSizeSegmentedControl: UISegmentedControl!
 22 | 
 23 |     override func viewDidLoad() {
 24 |         super.viewDidLoad()
 25 |         
 26 |         gifSizeSegmentedControl.selectedSegmentIndex = 1
 27 |         
 28 |         photoView = PHLivePhotoView(frame: CGRect.init(x: 0, y: 0, width: self.view.bounds.width, height: self.view.bounds.width))
 29 |         photoView.contentMode = .scaleAspectFit
 30 |         
 31 |         self.view.addSubview(photoView)
 32 |         
 33 |         gifView = UIImageView(frame: CGRect.init(x: 0, y: 0, width: self.view.bounds.width, height: self.view.bounds.width))
 34 |         gifView.contentMode = .scaleAspectFit
 35 |         
 36 |     }
 37 |     
 38 |     
 39 |     override func viewDidLayoutSubviews() {
 40 |         super.viewDidLayoutSubviews()
 41 |         self.photoView.center = self.view.center
 42 |         self.gifView.center = self.view.center
 43 |     }
 44 |     
 45 |     
 46 |     override func viewWillAppear(_ animated: Bool) {
 47 |         super.viewWillAppear(animated)
 48 |         configureView()
 49 |     }
 50 |     
 51 |     func configureView() {
 52 |         if let photoAsset = livePhotoAsset {
 53 |             PHImageManager.default().requestLivePhoto(for: photoAsset, targetSize: photoView.frame.size, contentMode: .aspectFit, options: nil, resultHandler: { (photo: PHLivePhoto?, info: [AnyHashable : Any]?) in
 54 |                 
 55 |                 if let livePhoto = photo{
 56 |                     self.photoView.livePhoto = livePhoto
 57 |                     self.photoView.startPlayback(with: .hint)
 58 |                     
 59 |                     if let photoLocation = photoAsset.location {
 60 |                         let geoCoder = CLGeocoder()
 61 |                         geoCoder.reverseGeocodeLocation(photoLocation, completionHandler: { (placemark: [CLPlacemark]?, error: Error?) in
 62 |                             if error == nil {
 63 |                                 self.navigationItem.title = placemark?.first?.locality
 64 |                             }
 65 |                         })
 66 |                     }
 67 |                 }
 68 |             })
 69 |         }
 70 |     }
 71 |     
 72 |     
 73 |     @IBAction func segmentedControlClicked(_ sender: UISegmentedControl) {
 74 |         exportShareButton.setTitle("Export GIF", for: .normal)
 75 |     }
 76 |     
 77 |     
 78 |     
 79 |     @IBAction func exportShareButton(_ sender: UIButton) {
 80 |         if exportShareButton.titleLabel?.text == "Export GIF" {
 81 |             
 82 |             let resources = PHAssetResource.assetResources(for: livePhotoAsset!)
 83 |             for resource in resources {
 84 |                 if resource.type == .pairedVideo {
 85 |                     self.getMovieData(resource)
 86 |                     break
 87 |                 }
 88 |             }
 89 |         } else {
 90 |             let activityVC = UIActivityViewController(activityItems: [gifURL!], applicationActivities: nil)
 91 |             activityVC.popoverPresentationController?.sourceView = self.view
 92 |             self.present(activityVC, animated: true, completion: nil)
 93 |         }
 94 |         
 95 |     }
 96 |     
 97 |     
 98 |     func getMovieData(_ resource: PHAssetResource){
 99 |         
100 |         let movieURL = URL(fileURLWithPath: (NSTemporaryDirectory()).appending("video.mov"))
101 |         removeFileIfExists(fileURL: movieURL)
102 | 
103 |         
104 |         PHAssetResourceManager.default().writeData(for: resource, toFile: movieURL as URL, options: nil) { (error) in
105 |             if error != nil{
106 |                 print("Could not write video file")
107 |             } else {
108 |                 self.convertToGIF(movieURL)
109 |             }
110 |         }
111 |     }
112 |     
113 |     
114 |     func convertToGIF(_ movieURL: URL){
115 |         
116 |         let movieAsset = AVURLAsset(url: movieURL as URL)
117 |         
118 |         // collect the needed parameters
119 |         let duration = CMTimeGetSeconds(movieAsset.duration)
120 |         let track = movieAsset.tracks(withMediaType: AVMediaTypeVideo).first!
121 |         let frameRate = track.nominalFrameRate
122 |         
123 |         gifURL = URL(fileURLWithPath: (NSTemporaryDirectory()).appending("file.gif"))
124 |         removeFileIfExists(fileURL: gifURL!)
125 |         
126 |         var width  = 0
127 |         
128 |         switch gifSizeSegmentedControl.selectedSegmentIndex {
129 |         case 0:
130 |             width =  240
131 |         case 1:
132 |             width =  480
133 |         case 2:
134 |             width =  640
135 |         default:
136 |             width = 0
137 |         }
138 |   
139 |         
140 |         Regift.createGIFFromSource(movieURL as URL, destinationFileURL: gifURL, startTime: 0.0, duration: Float(duration), frameRate: Int(frameRate), loopCount: 0, width: width, height: width) {_ in
141 |           
142 |             exportShareButton.setTitle("Share", for: .normal)
143 |             self.gifView.loadGif(url: gifURL!)
144 |             self.photoView.removeFromSuperview()
145 |             self.view.addSubview(gifView)
146 |         }
147 |         
148 |     }
149 |     
150 | 
151 |     
152 |     func removeFileIfExists(fileURL : URL) {
153 |         let fileManager = FileManager.default
154 |         if fileManager.fileExists(atPath: fileURL.path) {
155 |             do {
156 |                 try fileManager.removeItem(at: fileURL)
157 |             }
158 |             catch {
159 |                 print("Could not delete exist file so cannot write to it")
160 |             }
161 |         }
162 |     }
163 | 
164 | 
165 | }
166 | 


--------------------------------------------------------------------------------
/LivelyGIFs/PhotoCollectionVC.swift:
--------------------------------------------------------------------------------
  1 | //
  2 | //  PhotoCollectionVC.swift
  3 | //  LivelyGIFs
  4 | //
  5 | //  Created by Xue Yu on 4/4/17.
  6 | //  Copyright © 2017 XueYu. All rights reserved.
  7 | //
  8 | 
  9 | import UIKit
 10 | import Photos
 11 | 
 12 | private let reuseIdentifier = "Cell"
 13 | 
 14 | class PhotoCollectionVC: UICollectionViewController {
 15 |     
 16 |     var livePhotoAssets: PHFetchResult<PHAsset>?
 17 |     
 18 | 
 19 |     override func viewDidLoad() {
 20 |         super.viewDidLoad()
 21 |         
 22 |         
 23 |         PHPhotoLibrary.requestAuthorization { (status:PHAuthorizationStatus) in
 24 |             switch status {
 25 |                 case .authorized:
 26 |                     self.fetchPhotos()
 27 |                 default:
 28 |                     self.showNoPhotoAccessAlert()
 29 |             }
 30 |         }
 31 | 
 32 |     }
 33 |     
 34 | 
 35 |     
 36 |     func fetchPhotos() {
 37 |         
 38 |         let sortDesciptor = NSSortDescriptor(key: "creationDate", ascending:false)
 39 |         let predicate = NSPredicate(format: "(mediaSubtype & %d) != 0", PHAssetMediaSubtype.photoLive.rawValue)
 40 |         
 41 |         let options = PHFetchOptions()
 42 |         
 43 |         options.sortDescriptors = [sortDesciptor]
 44 |         options.predicate = predicate
 45 |         
 46 |         
 47 |         DispatchQueue.global(qos: DispatchQoS.QoSClass.default).async {
 48 |             self.livePhotoAssets = PHAsset.fetchAssets(with: options)
 49 |             
 50 |             DispatchQueue.main.async {
 51 |                 self.collectionView?.reloadData()
 52 |             }
 53 |         }
 54 |     }
 55 |     
 56 |     
 57 |     func showNoPhotoAccessAlert() {
 58 |         let alert = UIAlertController(title: "No Photo Access Permission", message: "Please grant this App access your photos in Settings -- > Privacy", preferredStyle: .alert)
 59 |         
 60 |         alert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
 61 |         alert.addAction(UIAlertAction(title: "Settings", style: .default, handler:{ (action: UIAlertAction) in
 62 |             let url = URL(string: UIApplicationOpenSettingsURLString)
 63 |             UIApplication.shared.open(url!, options: ["" : ""], completionHandler: nil)
 64 |             return
 65 |         }))
 66 |         
 67 |         self.present(alert, animated: true, completion: nil)
 68 |     }
 69 | 
 70 | 
 71 |     // MARK: UICollectionViewDataSource
 72 | 
 73 |     override func numberOfSections(in collectionView: UICollectionView) -> Int {
 74 |         return 1
 75 |     }
 76 | 
 77 | 
 78 |     override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
 79 |         if let numberOfItems = livePhotoAssets?.count {
 80 |             return numberOfItems
 81 |         } else {
 82 |             return 0
 83 |         }
 84 |     }
 85 | 
 86 |     override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
 87 |         let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath) as! PhotoCollectionViewCell
 88 |         
 89 |         if let asset = livePhotoAssets?[indexPath.row]{
 90 |             let options = PHImageRequestOptions()
 91 |             options.isNetworkAccessAllowed = true
 92 |             
 93 |             let targetSize = CGSize(width: 100, height: 100)
 94 |             PHImageManager.default().requestImage(for: asset, targetSize: targetSize, contentMode: .aspectFill, options: options, resultHandler: { (image: UIImage?, info: [AnyHashable : Any]?) in
 95 |                 cell.photoImageView.image = image
 96 |             })
 97 |         }
 98 |         
 99 |         return cell
100 |     }
101 |     
102 |     
103 |     
104 |     override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
105 |         if let indexPath = collectionView?.indexPathsForSelectedItems?.first {
106 |             let photoVC = segue.destination as! LivePhotoVC
107 |             photoVC.livePhotoAsset = livePhotoAssets?[indexPath.item]
108 |         }
109 |     }
110 | }
111 | 


--------------------------------------------------------------------------------
/LivelyGIFs/PhotoCollectionViewCell.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  PhotoCollectionViewCell.swift
 3 | //  LivelyGIFs
 4 | //
 5 | //  Created by Xue Yu on 4/4/17.
 6 | //  Copyright © 2017 XueYu. All rights reserved.
 7 | //
 8 | 
 9 | import UIKit
10 | 
11 | class PhotoCollectionViewCell: UICollectionViewCell {
12 |     
13 |     @IBOutlet weak var photoImageView: UIImageView!
14 | 
15 | }
16 | 


--------------------------------------------------------------------------------
/LivelyGIFs/Regift.swift:
--------------------------------------------------------------------------------
  1 | //
  2 | //  Regift.swift
  3 | //  Regift
  4 | //
  5 | //  Created by Matthew Palmer on 27/12/2014.
  6 | //  Copyright (c) 2014 Matthew Palmer. All rights reserved.
  7 | //
  8 | //  Minor changes made by Xue Yu, add parameters for the gif width/height
  9 | // 
 10 | 
 11 | #if os(iOS)
 12 |     import UIKit
 13 |     import MobileCoreServices
 14 | #elseif os(OSX)
 15 |     import AppKit
 16 | #endif
 17 | 
 18 | import ImageIO
 19 | import AVFoundation
 20 | 
 21 | public typealias TimePoint = CMTime
 22 | 
 23 | /// Errors thrown by Regift
 24 | public enum RegiftError: String, Error {
 25 |     case DestinationNotFound = "The temp file destination could not be created or found"
 26 |     case SourceFormatInvalid = "The source file does not appear to be a valid format"
 27 |     case AddFrameToDestination = "An error occurred when adding a frame to the destination"
 28 |     case DestinationFinalize = "An error occurred when finalizing the destination"
 29 | }
 30 | 
 31 | // Convenience struct for managing dispatch groups.
 32 | private struct Group {
 33 |     let group = DispatchGroup()
 34 |     func enter() { group.enter() }
 35 |     func leave() { group.leave() }
 36 |     func wait() { let _ = group.wait(timeout: DispatchTime.distantFuture) }
 37 | }
 38 | 
 39 | /// Easily convert a video to a GIF. It can convert the whole thing, or you can choose a section to trim out.
 40 | ///
 41 | /// Synchronous Usage:
 42 | ///
 43 | ///      let regift = Regift(sourceFileURL: movieFileURL, frameCount: 24, delayTime: 0.5, loopCount: 7, width: 240, height: 240)
 44 | ///      print(regift.createGif())
 45 | ///
 46 | ///      // OR
 47 | ///
 48 | ///      let trimmedRegift = Regift(sourceFileURL: movieFileURL, startTime: 30, duration: 15, frameRate: 15)
 49 | ///      print(trimmedRegift.createGif())
 50 | ///
 51 | /// Asynchronous Usage:
 52 | ///
 53 | ///      let regift = Regift.createGIFFromSource(movieFileURL, frameCount: 24, delayTime: 0.5, loopCount: 7) { (result) in
 54 | ///          print(result)
 55 | ///      }
 56 | ///
 57 | ///      // OR
 58 | ///
 59 | ///      let trimmedRegift = Regift.createGIFFromSource(movieFileURL, startTime: 30, duration: 15, frameRate: 15, loopCount: 0, width: 240, height: 240) { (result) in
 60 | ///          print(result)
 61 | ///      }
 62 | ///
 63 | public struct Regift {
 64 |     
 65 |     // Static conversion methods, for convenient and easy-to-use API:
 66 |     
 67 |     /**
 68 |      Create a GIF from a movie stored at the given URL. This converts the whole video to a GIF meeting the requested output parameters.
 69 |      
 70 |      - parameters:
 71 |      - sourceFileURL: The source file to create the GIF from.
 72 |      - destinationFileURL: An optional destination file to write the GIF to. If you don't include this, a default path will be provided.
 73 |      - frameCount: The number of frames to include in the gif; each frame has the same duration and is spaced evenly over the video.
 74 |      - delayTime: The amount of time each frame exists for in the GIF.
 75 |      - loopCount: The number of times the GIF will repeat. This defaults to `0`, which means that the GIF will repeat infinitely.
 76 |      - width: The maximum width of generated GIF. This defaults to `0`, means not compressed.
 77 |      - height: The maximum height of generated GIF. This defaults to `0`, means not compressed. Setting width/height will not change the image aspect ratio.
 78 |      - completion: A block that will be called when the GIF creation is completed. The `result` parameter provides the path to the file, or will be `nil` if there was an error.
 79 |      */
 80 |     public static func createGIFFromSource(
 81 |         _ sourceFileURL: URL,
 82 |         destinationFileURL: URL? = nil,
 83 |         frameCount: Int,
 84 |         delayTime: Float,
 85 |         loopCount: Int = 0,
 86 |         width: Int = 0,
 87 |         height: Int = 0,
 88 |         completion: (_ result: URL?) -> Void) {
 89 |         let gift = Regift(
 90 |             sourceFileURL: sourceFileURL,
 91 |             destinationFileURL: destinationFileURL,
 92 |             frameCount: frameCount,
 93 |             delayTime: delayTime,
 94 |             loopCount: loopCount,
 95 |             width: width,
 96 |             height: height
 97 |         )
 98 |         
 99 |         completion(gift.createGif())
100 |     }
101 |     
102 |     /**
103 |      Create a GIF from a movie stored at the given URL. This allows you to choose a start time and duration in the source material that will be used to create the GIF which meets the output parameters.
104 |      
105 |      - parameters:
106 |      - sourceFileURL: The source file to create the GIF from.
107 |      - destinationFileURL: An optional destination file to write the GIF to. If you don't include this, a default path will be provided.
108 |      - startTime: The time in seconds in the source material at which you want the GIF to start.
109 |      - duration: The duration in seconds that you want to pull from the source material.
110 |      - frameRate: The desired frame rate of the outputted GIF.
111 |      - loopCount: The number of times the GIF will repeat. This defaults to `0`, which means that the GIF will repeat infinitely.
112 |      - width: The maximum width of generated GIF. This defaults to `0`, means not compressed.
113 |      - height: The maximum height of generated GIF. This defaults to `0`, means not compressed. Setting width/height will not change the image aspect ratio.
114 |      - completion: A block that will be called when the GIF creation is completed. The `result` parameter provides the path to the file, or will be `nil` if there was an error.
115 |      */
116 |     public static func createGIFFromSource(
117 |         _ sourceFileURL: URL,
118 |         destinationFileURL: URL? = nil,
119 |         startTime: Float,
120 |         duration: Float,
121 |         frameRate: Int,
122 |         loopCount: Int = 0,
123 |         width: Int = 0,
124 |         height: Int = 0,
125 |         completion: (_ result: URL?) -> Void) {
126 |         let gift = Regift(
127 |             sourceFileURL: sourceFileURL,
128 |             destinationFileURL: destinationFileURL,
129 |             startTime: startTime,
130 |             duration: duration,
131 |             frameRate: frameRate,
132 |             loopCount: loopCount,
133 |             width: width,
134 |             height: height
135 |         )
136 |         
137 |         completion(gift.createGif())
138 |     }
139 |     
140 |     fileprivate struct Constants {
141 |         static let FileName = "regift.gif"
142 |         static let TimeInterval: Int32 = 600
143 |         static let Tolerance = 0.01
144 |     }
145 |     
146 |     /// A reference to the asset we are converting.
147 |     fileprivate var asset: AVAsset
148 |     
149 |     /// The url for the source file.
150 |     fileprivate let sourceFileURL: URL
151 |     
152 |     /// The point in time in the source which we will start from.
153 |     fileprivate var startTime: Float = 0
154 |     
155 |     /// The desired duration of the gif.
156 |     fileprivate var duration: Float
157 |     
158 |     /// The total length of the movie, in seconds.
159 |     fileprivate var movieLength: Float
160 |     
161 |     /// The number of frames we are going to use to create the gif.
162 |     fileprivate let frameCount: Int
163 |     
164 |     /// The amount of time each frame will remain on screen in the gif.
165 |     fileprivate let delayTime: Float
166 |     
167 |     /// The number of times the gif will loop (0 is infinite).
168 |     fileprivate let loopCount: Int
169 |     
170 |     /// The destination path for the generated file.
171 |     fileprivate var destinationFileURL: URL?
172 |     
173 |     /// The maximum width/height for the generated file (0 will not compress).compress
174 |     fileprivate var width: Int
175 |     fileprivate var height: Int
176 |     
177 |     /**
178 |      Create a GIF from a movie stored at the given URL. This converts the whole video to a GIF meeting the requested output parameters.
179 |      
180 |      - parameters:
181 |      - sourceFileURL: The source file to create the GIF from.
182 |      - destinationFileURL: An optional destination file to write the GIF to. If you don't include this, a default path will be provided.
183 |      - frameCount: The number of frames to include in the gif; each frame has the same duration and is spaced evenly over the video.
184 |      - delayTime: The amount of time each frame exists for in the GIF.
185 |      - loopCount: The number of times the GIF will repeat. This defaults to `0`, which means that the GIF will repeat infinitely.
186 |      - width: The maximum width of generated GIF. This defaults to `0`, means not compressed.
187 |      - height: The maximum height of generated GIF. This defaults to `0`, means not compressed. Setting width/height will not change the image aspect ratio.
188 |      */
189 |     public init(sourceFileURL: URL, destinationFileURL: URL? = nil, frameCount: Int, delayTime: Float, loopCount: Int = 0, width: Int = 0, height: Int = 0) {
190 |         self.sourceFileURL = sourceFileURL
191 |         self.asset = AVURLAsset(url: sourceFileURL, options: nil)
192 |         self.movieLength = Float(asset.duration.value) / Float(asset.duration.timescale)
193 |         self.duration = movieLength
194 |         self.delayTime = delayTime
195 |         self.loopCount = loopCount
196 |         self.destinationFileURL = destinationFileURL
197 |         self.frameCount = frameCount
198 |         self.width = width
199 |         self.height = height
200 |     }
201 |     
202 |     /**
203 |      Create a GIF from a movie stored at the given URL. This allows you to choose a start time and duration in the source material that will be used to create the GIF which meets the output parameters.
204 |      
205 |      - parameters:
206 |      - sourceFileURL: The source file to create the GIF from.
207 |      - destinationFileURL: An optional destination file to write the GIF to. If you don't include this, a default path will be provided.
208 |      - startTime: The time in seconds in the source material at which you want the GIF to start.
209 |      - duration: The duration in seconds that you want to pull from the source material.
210 |      - frameRate: The desired frame rate of the outputted GIF.
211 |      - loopCount: The number of times the GIF will repeat. This defaults to `0`, which means that the GIF will repeat infinitely.
212 |      - width: The maximum width of generated GIF. This defaults to `0`, means not compressed.
213 |      - height: The maximum height of generated GIF. This defaults to `0`, means not compressed. Setting width/height will not change the image aspect ratio.
214 |      */
215 |     public init(sourceFileURL: URL, destinationFileURL: URL? = nil, startTime: Float, duration: Float, frameRate: Int, loopCount: Int = 0, width: Int = 0, height: Int = 0) {
216 |         self.sourceFileURL = sourceFileURL
217 |         self.asset = AVURLAsset(url: sourceFileURL, options: nil)
218 |         self.destinationFileURL = destinationFileURL
219 |         self.startTime = startTime
220 |         self.duration = duration
221 |         
222 |         // The delay time is based on the desired framerate of the gif.
223 |         self.delayTime = (1.0 / Float(frameRate))
224 |         
225 |         // The frame count is based on the desired length and framerate of the gif.
226 |         self.frameCount = Int(duration * Float(frameRate))
227 |         
228 |         // The total length of the file, in seconds.
229 |         self.movieLength = Float(asset.duration.value) / Float(asset.duration.timescale)
230 |         
231 |         self.loopCount = loopCount
232 |         self.width = width
233 |         self.height = height
234 |     }
235 |     
236 |     /**
237 |      Get the URL of the GIF created with the attributes provided in the initializer.
238 |      
239 |      - returns: The path to the created GIF, or `nil` if there was an error creating it.
240 |      */
241 |     public func createGif() -> URL? {
242 |         
243 |         let fileProperties = [kCGImagePropertyGIFDictionary as String:[
244 |             kCGImagePropertyGIFLoopCount as String: NSNumber(value: Int32(loopCount) as Int32)],
245 |                               kCGImagePropertyGIFHasGlobalColorMap as String: NSValue(nonretainedObject: true)
246 |             ] as [String : Any]
247 |         
248 |         let frameProperties = [
249 |             kCGImagePropertyGIFDictionary as String:[
250 |                 kCGImagePropertyGIFDelayTime as String:delayTime
251 |             ]
252 |         ]
253 |         
254 |         // How far along the video track we want to move, in seconds.
255 |         let increment = Float(duration) / Float(frameCount)
256 |         
257 |         // Add each of the frames to the buffer
258 |         var timePoints: [TimePoint] = []
259 |         
260 |         for frameNumber in 0 ..< frameCount {
261 |             let seconds: Float64 = Float64(startTime) + (Float64(increment) * Float64(frameNumber))
262 |             let time = CMTimeMakeWithSeconds(seconds, Constants.TimeInterval)
263 |             
264 |             timePoints.append(time)
265 |         }
266 |         
267 |         do {
268 |             return try createGIFForTimePoints(timePoints, fileProperties: fileProperties as [String : AnyObject], frameProperties: frameProperties as [String : AnyObject], frameCount: frameCount, width: width, height: height)
269 |             
270 |         } catch {
271 |             return nil
272 |         }
273 |     }
274 |     
275 |     /**
276 |      Create a GIF using the given time points in a movie file stored in this Regift's `asset`.
277 |      
278 |      - parameters:
279 |      - timePoints: timePoints An array of `TimePoint`s (which are typealiased `CMTime`s) to use as the frames in the GIF.
280 |      - fileProperties: The desired attributes of the resulting GIF.
281 |      - frameProperties: The desired attributes of each frame in the resulting GIF.
282 |      - frameCount: The desired number of frames for the GIF. *NOTE: This seems redundant to me, as `timePoints.count` should really be what we are after, but I'm hesitant to change the API here.*
283 |      - width: The maximum width of generated GIF. This defaults to `0`, means not compressed.
284 |      - height: The maximum height of generated GIF. This defaults to `0`, means not compressed. Setting width/height will not change the image aspect ratio.
285 |      
286 |      - returns: The path to the created GIF, or `nil` if there was an error creating it.
287 |      */
288 |     public func createGIFForTimePoints(_ timePoints: [TimePoint], fileProperties: [String: AnyObject], frameProperties: [String: AnyObject], frameCount: Int, width: Int, height: Int) throws -> URL {
289 |         // Ensure the source media is a valid file.
290 |         guard asset.tracks(withMediaCharacteristic: AVMediaCharacteristicVisual).count > 0 else {
291 |             throw RegiftError.SourceFormatInvalid
292 |         }
293 |         
294 |         var fileURL:URL?
295 |         if self.destinationFileURL != nil {
296 |             fileURL = self.destinationFileURL
297 |         } else {
298 |             let temporaryFile = (NSTemporaryDirectory() as NSString).appendingPathComponent(Constants.FileName)
299 |             fileURL = URL(fileURLWithPath: temporaryFile)
300 |         }
301 |         
302 |         guard let destination = CGImageDestinationCreateWithURL(fileURL! as CFURL, kUTTypeGIF, frameCount, nil) else {
303 |             throw RegiftError.DestinationNotFound
304 |         }
305 |         
306 |         CGImageDestinationSetProperties(destination, fileProperties as CFDictionary)
307 |         
308 |         let generator = AVAssetImageGenerator(asset: asset)
309 |         
310 |         generator.appliesPreferredTrackTransform = true
311 |         generator.maximumSize = CGSize(width: width, height: height)
312 |         
313 |         let tolerance = CMTimeMakeWithSeconds(Constants.Tolerance, Constants.TimeInterval)
314 |         generator.requestedTimeToleranceBefore = tolerance
315 |         generator.requestedTimeToleranceAfter = tolerance
316 |         
317 |         // Transform timePoints to times for the async asset generator method.
318 |         var times = [NSValue]()
319 |         for time in timePoints {
320 |             times.append(NSValue(time: time))
321 |         }
322 |         
323 |         // Create a dispatch group to force synchronous behavior on an asynchronous method.
324 |         let gifGroup = Group()
325 |         var dispatchError: Bool = false
326 |         gifGroup.enter()
327 |         
328 |         generator.generateCGImagesAsynchronously(forTimes: times, completionHandler: { (requestedTime, image, actualTime, result, error) in
329 |             guard let imageRef = image , error == nil else {
330 |                 print("An error occurred: \(error), image is \(image)")
331 |                 dispatchError = true
332 |                 gifGroup.leave()
333 |                 return
334 |             }
335 |             
336 |             CGImageDestinationAddImage(destination, imageRef, frameProperties as CFDictionary)
337 |             
338 |             if requestedTime == times.last?.timeValue {
339 |                 gifGroup.leave()
340 |             }
341 |         })
342 |         
343 |         // Wait for the asynchronous generator to finish.
344 |         gifGroup.wait()
345 |         
346 |         // If there was an error in the generator, throw the error.
347 |         if dispatchError {
348 |             throw RegiftError.AddFrameToDestination
349 |         }
350 |         
351 |         CGImageDestinationSetProperties(destination, fileProperties as CFDictionary)
352 |         
353 |         // Finalize the gif
354 |         if !CGImageDestinationFinalize(destination) {
355 |             throw RegiftError.DestinationFinalize
356 |         }
357 |         
358 |         return fileURL!
359 |     }
360 | }
361 | 


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/ReadMe.md:
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 1 | # LivelyGIFs
 2 | 
 3 | Show your Live Photo and export as GIF. 
 4 | 
 5 | [![Swift 3.0](https://img.shields.io/badge/Swift-3.0-orange.svg?style=flat)](https://developer.apple.com/swift/) [![License MIT](https://img.shields.io/badge/License-MIT-blue.svg?style=flat)](https://github.com/Carthage/Carthage)
 6 | 
 7 | 
 8 | Demo 
 9 | 
10 | ![Demo](demo.gif)
11 | 
12 | 
13 | 
14 | ## HighLights
15 | 
16 | 
17 | 
18 | - Do not use Pod or Cathage to install 3rd party library
19 | - Simple logic, new learner friendly
20 | 
21 | 
22 | 
23 | ## Known problems && Possible improvements
24 | 
25 | 1. Load all live photos at once may cost too much.
26 | 2. Live photos assets are loaded once in viewDidLoad so may not show the dynamic changes.
27 | 3. Activity indicator to avoid white screen gap. 
28 | 
29 | 
30 | ## Inspired by
31 | 
32 | [LiveGIFs](https://github.com/neonichu/LiveGIFs)
33 | 
34 | ## Thanks 
35 | 
36 | 
37 | - [Regift](https://github.com/matthewpalmer/Regift)
38 | - [LivePreview](https://github.com/daver234/LivePreview)
39 | 
40 | 
41 | 


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/demo.gif:
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https://raw.githubusercontent.com/KrisYu/LivelyGIFs/5fca1880d7e41050acbd7997b11de6bae4ba3880/demo.gif


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