├── CoverFlowLayout.xcodeproj
    ├── project.pbxproj
    ├── project.xcworkspace
    │   ├── contents.xcworkspacedata
    │   ├── xcshareddata
    │   │   └── CoverFlowLayout.xcscmblueprint
    │   └── xcuserdata
    │   │   └── Broccoli.xcuserdatad
    │   │       └── UserInterfaceState.xcuserstate
    └── xcuserdata
    │   └── Broccoli.xcuserdatad
    │       └── xcschemes
    │           ├── CoverFlowLayout.xcscheme
    │           └── xcschememanagement.plist
├── CoverFlowLayout
    ├── AppDelegate.swift
    ├── Assets.xcassets
    │   └── AppIcon.appiconset
    │   │   └── Contents.json
    ├── Base.lproj
    │   ├── LaunchScreen.storyboard
    │   └── Main.storyboard
    ├── CoverFlowLayout.swift
    ├── Info.plist
    └── ViewController.swift
└── README.md


/CoverFlowLayout.xcodeproj/project.pbxproj:
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 7 | 		<key>CoverFlowLayout.xcscheme</key>
 8 | 		<dict>
 9 | 			<key>orderHint</key>
10 | 			<integer>0</integer>
11 | 		</dict>
12 | 	</dict>
13 | 	<key>SuppressBuildableAutocreation</key>
14 | 	<dict>
15 | 		<key>A43F39FC1C074ABD0019A555</key>
16 | 		<dict>
17 | 			<key>primary</key>
18 | 			<true/>
19 | 		</dict>
20 | 	</dict>
21 | </dict>
22 | </plist>
23 | 


--------------------------------------------------------------------------------
/CoverFlowLayout/AppDelegate.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  AppDelegate.swift
 3 | //  CoverFlowLayout
 4 | //
 5 | //  Created by Broccoli on 15/11/26.
 6 | //  Copyright © 2015年 Broccoli. 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: [NSObject: AnyObject]?) -> 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 throttle down OpenGL ES frame rates. 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 inactive 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 | 


--------------------------------------------------------------------------------
/CoverFlowLayout/Assets.xcassets/AppIcon.appiconset/Contents.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "images" : [
 3 |     {
 4 |       "idiom" : "iphone",
 5 |       "size" : "29x29",
 6 |       "scale" : "2x"
 7 |     },
 8 |     {
 9 |       "idiom" : "iphone",
10 |       "size" : "29x29",
11 |       "scale" : "3x"
12 |     },
13 |     {
14 |       "idiom" : "iphone",
15 |       "size" : "40x40",
16 |       "scale" : "2x"
17 |     },
18 |     {
19 |       "idiom" : "iphone",
20 |       "size" : "40x40",
21 |       "scale" : "3x"
22 |     },
23 |     {
24 |       "idiom" : "iphone",
25 |       "size" : "60x60",
26 |       "scale" : "2x"
27 |     },
28 |     {
29 |       "idiom" : "iphone",
30 |       "size" : "60x60",
31 |       "scale" : "3x"
32 |     },
33 |     {
34 |       "idiom" : "ipad",
35 |       "size" : "29x29",
36 |       "scale" : "1x"
37 |     },
38 |     {
39 |       "idiom" : "ipad",
40 |       "size" : "29x29",
41 |       "scale" : "2x"
42 |     },
43 |     {
44 |       "idiom" : "ipad",
45 |       "size" : "40x40",
46 |       "scale" : "1x"
47 |     },
48 |     {
49 |       "idiom" : "ipad",
50 |       "size" : "40x40",
51 |       "scale" : "2x"
52 |     },
53 |     {
54 |       "idiom" : "ipad",
55 |       "size" : "76x76",
56 |       "scale" : "1x"
57 |     },
58 |     {
59 |       "idiom" : "ipad",
60 |       "size" : "76x76",
61 |       "scale" : "2x"
62 |     }
63 |   ],
64 |   "info" : {
65 |     "version" : 1,
66 |     "author" : "xcode"
67 |   }
68 | }


--------------------------------------------------------------------------------
/CoverFlowLayout/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="8150" systemVersion="15A204g" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" initialViewController="01J-lp-oVM">
 3 |     <dependencies>
 4 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="8122"/>
 5 |     </dependencies>
 6 |     <scenes>
 7 |         <!--View Controller-->
 8 |         <scene sceneID="EHf-IW-A2E">
 9 |             <objects>
10 |                 <viewController id="01J-lp-oVM" sceneMemberID="viewController">
11 |                     <layoutGuides>
12 |                         <viewControllerLayoutGuide type="top" id="Llm-lL-Icb"/>
13 |                         <viewControllerLayoutGuide type="bottom" id="xb3-aO-Qok"/>
14 |                     </layoutGuides>
15 |                     <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
16 |                         <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
17 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
18 |                         <animations/>
19 |                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
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 | 


--------------------------------------------------------------------------------
/CoverFlowLayout/Base.lproj/Main.storyboard:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="9060" systemVersion="15B42" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="4iT-zP-Gds">
 3 |     <dependencies>
 4 |         <deployment identifier="iOS"/>
 5 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="9051"/>
 6 |     </dependencies>
 7 |     <scenes>
 8 |         <!--View Controller-->
 9 |         <scene sceneID="DrB-Xm-irl">
10 |             <objects>
11 |                 <collectionViewController id="4iT-zP-Gds" customClass="ViewController" customModule="CoverFlowLayout" customModuleProvider="target" sceneMemberID="viewController">
12 |                     <collectionView key="view" multipleTouchEnabled="YES" contentMode="scaleToFill" alwaysBounceHorizontal="YES" pagingEnabled="YES" showsHorizontalScrollIndicator="NO" showsVerticalScrollIndicator="NO" dataMode="prototypes" id="enl-oB-GPH">
13 |                         <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
14 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
15 |                         <animations/>
16 |                         <collectionViewFlowLayout key="collectionViewLayout" scrollDirection="horizontal" minimumLineSpacing="10" minimumInteritemSpacing="10" id="nTS-TM-uaH" customClass="CoverFlowLayout" customModule="CoverFlowLayout" customModuleProvider="target">
17 |                             <size key="itemSize" width="280" height="450"/>
18 |                             <size key="headerReferenceSize" width="0.0" height="0.0"/>
19 |                             <size key="footerReferenceSize" width="0.0" height="0.0"/>
20 |                             <inset key="sectionInset" minX="0.0" minY="0.0" maxX="0.0" maxY="0.0"/>
21 |                         </collectionViewFlowLayout>
22 |                         <cells>
23 |                             <collectionViewCell opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" reuseIdentifier="CollectionCell" id="weP-R9-a3D">
24 |                                 <rect key="frame" x="0.0" y="75" width="280" height="450"/>
25 |                                 <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
26 |                                 <view key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center">
27 |                                     <rect key="frame" x="0.0" y="0.0" width="280" height="450"/>
28 |                                     <autoresizingMask key="autoresizingMask"/>
29 |                                     <animations/>
30 |                                     <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="calibratedWhite"/>
31 |                                 </view>
32 |                                 <animations/>
33 |                                 <size key="customSize" width="280" height="450"/>
34 |                             </collectionViewCell>
35 |                         </cells>
36 |                         <connections>
37 |                             <outlet property="dataSource" destination="4iT-zP-Gds" id="pPV-KI-Dlc"/>
38 |                             <outlet property="delegate" destination="4iT-zP-Gds" id="51o-9B-uPk"/>
39 |                         </connections>
40 |                     </collectionView>
41 |                 </collectionViewController>
42 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="ULQ-vy-Kp0" userLabel="First Responder" sceneMemberID="firstResponder"/>
43 |             </objects>
44 |             <point key="canvasLocation" x="353" y="381"/>
45 |         </scene>
46 |     </scenes>
47 | </document>
48 | 


--------------------------------------------------------------------------------
/CoverFlowLayout/CoverFlowLayout.swift:
--------------------------------------------------------------------------------
  1 | //
  2 | //  CoverFlowLayout.swift
  3 | //  CoverFlowLayout
  4 | //
  5 | //  Created by Broccoli on 15/11/26.
  6 | //  Copyright © 2015年 Broccoli. All rights reserved.
  7 | //
  8 | 
  9 | import UIKit
 10 | 
 11 | class CoverFlowLayout: UICollectionViewFlowLayout {
 12 |     let kDistanceToProjectionPlane: CGFloat = 500.0
 13 |     
 14 |     var maxCoverDegree: CGFloat = 30.0
 15 |     var coverDensity: CGFloat = 0.25
 16 | 
 17 |     override func shouldInvalidateLayoutForBoundsChange(newBounds: CGRect) -> Bool {
 18 |         return true
 19 |     }
 20 | 
 21 |     override func layoutAttributesForElementsInRect(rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
 22 |         let indexPaths = indexPathsOfItemsInRect(rect)
 23 |         
 24 |         var resultingAttributes = [UICollectionViewLayoutAttributes]()
 25 |         
 26 |         for indexPath in indexPaths {
 27 |             let attributes = layoutAttributesForItemAtIndexPath(indexPath)!
 28 |             resultingAttributes.append(attributes)
 29 |         }
 30 |         return resultingAttributes
 31 |     }
 32 |     
 33 |     override func layoutAttributesForItemAtIndexPath(indexPath: NSIndexPath) -> UICollectionViewLayoutAttributes? {
 34 |         let attributes = UICollectionViewLayoutAttributes(forCellWithIndexPath: indexPath)
 35 |         
 36 |         attributes.size = itemSize
 37 |         attributes.center = CGPoint(x: collectionView!.bounds.size.width * CGFloat(indexPath.row) + collectionView!.bounds.size.width, y: collectionView!.bounds.size.height / 2)
 38 |         
 39 |         interpolateAttributes(attributes, forOffset: collectionView!.contentOffset.x)
 40 |         return attributes
 41 |     }
 42 |     
 43 |     override func collectionViewContentSize() -> CGSize {
 44 |         return CGSize(width: collectionView!.bounds.width * CGFloat(collectionView!.numberOfItemsInSection(0)), height: collectionView!.bounds.height)
 45 |     }
 46 | }
 47 | 
 48 | 
 49 | // MARK: - private method
 50 | private extension CoverFlowLayout {
 51 |     func indexPathsOfItemsInRect(rect: CGRect) -> [NSIndexPath] {
 52 |         if collectionView!.numberOfItemsInSection(0) == 0 {
 53 |             return [NSIndexPath]()
 54 |         }
 55 |         var minRow: Int = max(Int(rect.origin.x / collectionView!.bounds.width), 0)
 56 |         var maxRow: Int = Int(CGRectGetMaxX(rect) / collectionView!.bounds.width)
 57 |         
 58 |         let candidateMinRow = max(minRow - 1, 0)
 59 |         if maxXForRow(candidateMinRow) >= rect.origin.x {
 60 |             minRow = candidateMinRow
 61 |         }
 62 |         
 63 |         let candidateMaxRow = min(maxRow + 1, collectionView!.numberOfItemsInSection(0) - 1)
 64 |         if minXForRow(candidateMaxRow) <= CGRectGetMaxX(rect) {
 65 |             maxRow = candidateMaxRow
 66 |         }
 67 |         
 68 |         var resultingInexPaths = [NSIndexPath]()
 69 |         
 70 |         for i in Int(minRow) ..< Int(maxRow) + 1 {
 71 |             resultingInexPaths.append(NSIndexPath(forRow: i, inSection: 0))
 72 |         }
 73 |         
 74 |         return resultingInexPaths
 75 |     }
 76 | 
 77 |     func minXForRow(row: Int) -> CGFloat {
 78 |         return itemCenterForRow(row - 1).x + (1 / 2 - coverDensity) * itemSize.width
 79 |     }
 80 |     
 81 |     func maxXForRow(row: Int) -> CGFloat {
 82 |         return itemCenterForRow(row + 1).x - (1 / 2 - coverDensity) * itemSize.width
 83 |     }
 84 |     
 85 |     func minXCenterForRow(row: Int) -> CGFloat {
 86 |         let halfWidth = itemSize.width / 2
 87 |         let maxRads = maxCoverDegree * CGFloat(M_PI) / 180
 88 |         let center = itemCenterForRow(row - 1).x
 89 |         let prevItemRightEdge = center + halfWidth
 90 |         let projectedLeftEdgeLocal = halfWidth * cos(maxRads) * kDistanceToProjectionPlane / (kDistanceToProjectionPlane + halfWidth * sin(maxRads))
 91 |         return prevItemRightEdge - coverDensity * itemSize.width + projectedLeftEdgeLocal
 92 |     }
 93 |     
 94 |     func maxXCenterForRow(row: Int) -> CGFloat {
 95 |         let halfWidth = itemSize.width / 2
 96 |         let maxRads = maxCoverDegree * CGFloat(M_PI) / 180
 97 |         let center = itemCenterForRow(row + 1).x
 98 |         let nextItemLeftEdge = center - halfWidth
 99 |         let projectedRightEdgeLocal = fabs(halfWidth * cos(maxRads) * kDistanceToProjectionPlane / (-halfWidth * sin(maxRads) - kDistanceToProjectionPlane))
100 |         return nextItemLeftEdge + coverDensity * itemSize.width - projectedRightEdgeLocal
101 |     }
102 |     
103 |     func itemCenterForRow(row: Int) -> CGPoint {
104 |         let collectionViewSize = collectionView!.bounds.size
105 |         return CGPoint(x: CGFloat(row) * collectionViewSize.width + collectionViewSize.width / 2, y: collectionViewSize.height / 2)
106 |     }
107 |     
108 |     func interpolateAttributes(attributes: UICollectionViewLayoutAttributes, forOffset offset: CGFloat) {
109 |         let attributesPath = attributes.indexPath
110 |         
111 |         let minInterval = CGFloat(attributesPath.row - 1) * collectionView!.bounds.width
112 |         let maxInterval = CGFloat(attributesPath.row + 1) * collectionView!.bounds.width
113 |         
114 |         let minX = minXCenterForRow(attributesPath.row)
115 |         let maxX = maxXCenterForRow(attributesPath.row)
116 |         
117 |         let interpolatedX = min(max(minX + (((maxX - minX) / (maxInterval - minInterval)) * (offset - minInterval)), minX), maxX)
118 |         attributes.center = CGPoint(x: interpolatedX, y: attributes.center.y)
119 |         
120 |         let angle = -maxCoverDegree + (interpolatedX - minX) * 2 * maxCoverDegree / (maxX - minX)
121 |         var transform = CATransform3DIdentity
122 |         
123 |         transform.m34 = -1.0 / kDistanceToProjectionPlane
124 |         transform = CATransform3DRotate(transform, angle * CGFloat(M_PI) / 180, 0, 1, 0)
125 |         attributes.transform3D = transform
126 |         attributes.zIndex = NSIntegerMax - attributesPath.row
127 |     }
128 | }
129 | 


--------------------------------------------------------------------------------
/CoverFlowLayout/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>CFBundleSignature</key>
20 | 	<string>????</string>
21 | 	<key>CFBundleVersion</key>
22 | 	<string>1</string>
23 | 	<key>LSRequiresIPhoneOS</key>
24 | 	<true/>
25 | 	<key>UILaunchStoryboardName</key>
26 | 	<string>LaunchScreen</string>
27 | 	<key>UIMainStoryboardFile</key>
28 | 	<string>Main</string>
29 | 	<key>UIRequiredDeviceCapabilities</key>
30 | 	<array>
31 | 		<string>armv7</string>
32 | 	</array>
33 | 	<key>UISupportedInterfaceOrientations</key>
34 | 	<array>
35 | 		<string>UIInterfaceOrientationPortrait</string>
36 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
37 | 		<string>UIInterfaceOrientationLandscapeRight</string>
38 | 	</array>
39 | 	<key>UISupportedInterfaceOrientations~ipad</key>
40 | 	<array>
41 | 		<string>UIInterfaceOrientationPortrait</string>
42 | 		<string>UIInterfaceOrientationPortraitUpsideDown</string>
43 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
44 | 		<string>UIInterfaceOrientationLandscapeRight</string>
45 | 	</array>
46 | </dict>
47 | </plist>
48 | 


--------------------------------------------------------------------------------
/CoverFlowLayout/ViewController.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  ViewController.swift
 3 | //  CoverFlowLayout
 4 | //
 5 | //  Created by Broccoli on 15/11/26.
 6 | //  Copyright © 2015年 Broccoli. All rights reserved.
 7 | //
 8 | 
 9 | import UIKit
10 | 
11 | class ViewController: UICollectionViewController {
12 | 
13 |     override func viewDidLoad() {
14 |         super.viewDidLoad()
15 |         // Do any additional setup after loading the view, typically from a nib.
16 |     }
17 | 
18 |     override func didReceiveMemoryWarning() {
19 |         super.didReceiveMemoryWarning()
20 |         // Dispose of any resources that can be recreated.
21 |     }
22 | 
23 | 
24 | }
25 | 
26 | private let CellIdentifier = "CollectionCell"
27 | extension ViewController {
28 |     override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
29 |         return 30
30 |     }
31 |     override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
32 |         let cell = collectionView.dequeueReusableCellWithReuseIdentifier(CellIdentifier, forIndexPath: indexPath)
33 |         cell.backgroundColor = UIColor(red: CGFloat(arc4random() % 255) / 255.0, green: CGFloat(arc4random() % 255) / 255.0, blue: CGFloat(arc4random() % 255) / 255.0, alpha: 1.0)
34 |         cell.layer.allowsEdgeAntialiasing = true
35 |         return cell
36 |     }
37 | }
38 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
1 | # CoverFlowLayout
2 | 模仿 Finder 中的 cover 模式
3 | 
4 | 


--------------------------------------------------------------------------------