├── CollectionViewCustom.xcodeproj
    ├── project.pbxproj
    ├── project.xcworkspace
    │   └── contents.xcworkspacedata
    └── xcuserdata
    │   └── damienromito.xcuserdatad
    │       ├── xcdebugger
    │           └── Breakpoints_v2.xcbkptlist
    │       └── xcschemes
    │           ├── CollectionViewCustom.xcscheme
    │           └── xcschememanagement.plist
├── CollectionViewCustom
    ├── AppDelegate.swift
    ├── Assets.xcassets
    │   └── AppIcon.appiconset
    │   │   └── Contents.json
    ├── Base.lproj
    │   ├── LaunchScreen.storyboard
    │   └── Main.storyboard
    ├── CustomCollectionViewCell.swift
    ├── Info.plist
    └── ViewController.swift
├── README.md
└── image.jpg


/CollectionViewCustom.xcodeproj/project.pbxproj:
--------------------------------------------------------------------------------
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6 | 


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--------------------------------------------------------------------------------
/CollectionViewCustom/AppDelegate.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  AppDelegate.swift
 3 | //  CollectionViewCustom
 4 | //
 5 | //  Created by Damien Romito on 08/02/2017.
 6 | //
 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 | 


--------------------------------------------------------------------------------
/CollectionViewCustom/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 |   "info" : {
35 |     "version" : 1,
36 |     "author" : "xcode"
37 |   }
38 | }


--------------------------------------------------------------------------------
/CollectionViewCustom/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 | 


--------------------------------------------------------------------------------
/CollectionViewCustom/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="11762" systemVersion="16C67" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
  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="11757"/>
  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 |         <!--View Controller-->
 14 |         <scene sceneID="tne-QT-ifu">
 15 |             <objects>
 16 |                 <viewController id="BYZ-38-t0r" customClass="ViewController" customModule="CollectionViewCustom" customModuleProvider="target" sceneMemberID="viewController">
 17 |                     <layoutGuides>
 18 |                         <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
 19 |                         <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
 20 |                     </layoutGuides>
 21 |                     <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
 22 |                         <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
 23 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
 24 |                         <subviews>
 25 |                             <collectionView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" dataMode="prototypes" translatesAutoresizingMaskIntoConstraints="NO" id="t9b-aC-Lbf">
 26 |                                 <rect key="frame" x="0.0" y="44" width="375" height="400"/>
 27 |                                 <color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
 28 |                                 <constraints>
 29 |                                     <constraint firstAttribute="height" constant="400" id="AH3-y0-cZl"/>
 30 |                                 </constraints>
 31 |                                 <collectionViewFlowLayout key="collectionViewLayout" scrollDirection="horizontal" minimumLineSpacing="10" minimumInteritemSpacing="10" id="wln-1e-97n">
 32 |                                     <size key="itemSize" width="302" height="376"/>
 33 |                                     <size key="headerReferenceSize" width="0.0" height="0.0"/>
 34 |                                     <size key="footerReferenceSize" width="0.0" height="0.0"/>
 35 |                                     <inset key="sectionInset" minX="0.0" minY="0.0" maxX="0.0" maxY="0.0"/>
 36 |                                 </collectionViewFlowLayout>
 37 |                                 <cells>
 38 |                                     <collectionViewCell opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" reuseIdentifier="CustomCell" id="Wyp-lR-jhd" customClass="CustomCollectionViewCell" customModule="CollectionViewCustom" customModuleProvider="target">
 39 |                                         <rect key="frame" x="0.0" y="12" width="302" height="376"/>
 40 |                                         <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
 41 |                                         <view key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center">
 42 |                                             <rect key="frame" x="0.0" y="0.0" width="302" height="376"/>
 43 |                                             <autoresizingMask key="autoresizingMask"/>
 44 |                                             <subviews>
 45 |                                                 <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Label" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="ptx-Lg-TNg">
 46 |                                                     <rect key="frame" x="24" y="24" width="254" height="50"/>
 47 |                                                     <constraints>
 48 |                                                         <constraint firstAttribute="height" constant="50" id="MeW-M1-z57"/>
 49 |                                                     </constraints>
 50 |                                                     <fontDescription key="fontDescription" type="system" pointSize="29"/>
 51 |                                                     <nil key="textColor"/>
 52 |                                                     <nil key="highlightedColor"/>
 53 |                                                 </label>
 54 |                                             </subviews>
 55 |                                         </view>
 56 |                                         <color key="backgroundColor" red="1" green="0.25444441629999998" blue="0.47273709889999999" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
 57 |                                         <constraints>
 58 |                                             <constraint firstItem="ptx-Lg-TNg" firstAttribute="leading" secondItem="Wyp-lR-jhd" secondAttribute="leadingMargin" constant="16" id="ICB-rI-oE2"/>
 59 |                                             <constraint firstAttribute="trailingMargin" secondItem="ptx-Lg-TNg" secondAttribute="trailing" constant="16" id="Qdh-PS-MQQ"/>
 60 |                                             <constraint firstItem="ptx-Lg-TNg" firstAttribute="top" secondItem="Wyp-lR-jhd" secondAttribute="topMargin" constant="16" id="xer-pj-Brx"/>
 61 |                                         </constraints>
 62 |                                         <connections>
 63 |                                             <outlet property="titleLabel" destination="ptx-Lg-TNg" id="SSU-gI-WHT"/>
 64 |                                         </connections>
 65 |                                     </collectionViewCell>
 66 |                                 </cells>
 67 |                                 <connections>
 68 |                                     <outlet property="dataSource" destination="BYZ-38-t0r" id="gJB-bF-hlW"/>
 69 |                                     <outlet property="delegate" destination="BYZ-38-t0r" id="sBC-ll-Jf9"/>
 70 |                                 </connections>
 71 |                             </collectionView>
 72 |                             <pageControl opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" numberOfPages="3" translatesAutoresizingMaskIntoConstraints="NO" id="TD8-V5-abv">
 73 |                                 <rect key="frame" x="16" y="452" width="343" height="40"/>
 74 |                                 <constraints>
 75 |                                     <constraint firstAttribute="height" constant="40" id="BhX-ER-IcM"/>
 76 |                                 </constraints>
 77 |                                 <color key="pageIndicatorTintColor" cocoaTouchSystemColor="groupTableViewBackgroundColor"/>
 78 |                                 <color key="currentPageIndicatorTintColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
 79 |                             </pageControl>
 80 |                         </subviews>
 81 |                         <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
 82 |                         <constraints>
 83 |                             <constraint firstAttribute="trailingMargin" secondItem="TD8-V5-abv" secondAttribute="trailing" id="30v-QM-hML"/>
 84 |                             <constraint firstItem="t9b-aC-Lbf" firstAttribute="leading" secondItem="8bC-Xf-vdC" secondAttribute="leading" id="4GC-Y0-p8N"/>
 85 |                             <constraint firstItem="TD8-V5-abv" firstAttribute="leading" secondItem="8bC-Xf-vdC" secondAttribute="leadingMargin" id="Hk4-7B-e26"/>
 86 |                             <constraint firstAttribute="trailing" secondItem="t9b-aC-Lbf" secondAttribute="trailing" id="KfG-Lj-pa1"/>
 87 |                             <constraint firstItem="TD8-V5-abv" firstAttribute="top" secondItem="t9b-aC-Lbf" secondAttribute="bottom" constant="8" id="OAT-Dn-xqr"/>
 88 |                             <constraint firstItem="t9b-aC-Lbf" firstAttribute="top" secondItem="8bC-Xf-vdC" secondAttribute="top" constant="44" id="bxp-eu-OIh"/>
 89 |                         </constraints>
 90 |                     </view>
 91 |                     <connections>
 92 |                         <outlet property="collectionView" destination="t9b-aC-Lbf" id="6Yb-wI-7dX"/>
 93 |                         <outlet property="pageControl" destination="TD8-V5-abv" id="Wau-d7-tdt"/>
 94 |                     </connections>
 95 |                 </viewController>
 96 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
 97 |             </objects>
 98 |             <point key="canvasLocation" x="136.80000000000001" y="138.98050974512745"/>
 99 |         </scene>
100 |     </scenes>
101 | </document>
102 | 


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/CollectionViewCustom/CustomCollectionViewCell.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  CustomCollectionViewCell.swift
 3 | //  CollectionViewCustom
 4 | //
 5 | //  Created by Damien Romito on 08/02/2017.
 6 | //
 7 | //
 8 | 
 9 | import UIKit
10 | 
11 | class CustomCollectionViewCell: UICollectionViewCell {
12 | 
13 |     @IBOutlet weak var titleLabel: UILabel!
14 |     override func awakeFromNib() {
15 |         super.awakeFromNib()
16 |         // Initialization code
17 |     }
18 | 
19 | }
20 | 
21 | 
22 | 
23 | 
24 | 
25 | 
26 | 
27 | 
28 | 
29 | 
30 | 
31 | 
32 | 
33 | 
34 | 
35 | 
36 | 
37 | 
38 | 
39 | 
40 | 
41 | 
42 | 
43 | 
44 | 
45 | 
46 | 
47 | 
48 | 
49 | 
50 | 
51 | 
52 | 
53 | 
54 | 
55 | 
56 | 
57 | 
58 | 
59 | 
60 | 
61 | 
62 | 
63 | 
64 | 
65 | 
66 | 
67 | 
68 | 
69 | 
70 | 
71 | 


--------------------------------------------------------------------------------
/CollectionViewCustom/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 | </dict>
38 | </plist>
39 | 


--------------------------------------------------------------------------------
/CollectionViewCustom/ViewController.swift:
--------------------------------------------------------------------------------
  1 | //
  2 | //  ViewController.swift
  3 | //  CollectionViewCustom
  4 | //
  5 | //  Created by Damien Romito on 08/02/2017.
  6 | //
  7 | //
  8 | 
  9 | import UIKit
 10 | 
 11 | class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout, UIScrollViewDelegate {
 12 | 
 13 |     @IBOutlet weak var pageControl: UIPageControl!
 14 |     @IBOutlet weak var collectionView: UICollectionView!
 15 |     let reuseIdentifier = "CustomCell"
 16 |     let collectionMargin = CGFloat(16)
 17 |     let itemSpacing = CGFloat(10)
 18 |     let itemHeight = CGFloat(322)
 19 |     
 20 |     var itemWidth = CGFloat(0)
 21 |     var currentItem = 0
 22 |     
 23 |     override func viewDidLoad() {
 24 |         super.viewDidLoad()
 25 |         // Do any additional setup after loading the view, typically from a nib.
 26 |         setup()
 27 | 
 28 |     }
 29 | 
 30 |     override func didReceiveMemoryWarning() {
 31 |         super.didReceiveMemoryWarning()
 32 |         // Dispose of any resources that can be recreated.
 33 |     }
 34 |     
 35 |     override func awakeFromNib() {
 36 |         super.awakeFromNib()
 37 |     }
 38 |     
 39 |     var items = ["Item 1 ", "Item 2 ", "Item 3 "]
 40 | 
 41 |     
 42 |     
 43 |     func setup() {
 44 | //
 45 | //        let bundle = Bundle(for: CustomCollectionViewCell.self)
 46 | //        let nib = UINib(nibName: String(describing: CustomCollectionViewCell.self), bundle:bundle)
 47 | //        self.collectionView.register(nib, forCellWithReuseIdentifier: reuseIdentifier)
 48 |         
 49 |         
 50 |         let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
 51 |         
 52 |         itemWidth =  UIScreen.main.bounds.width - collectionMargin * 2.0
 53 |         
 54 |         layout.sectionInset = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
 55 |         layout.itemSize = CGSize(width: itemWidth, height: itemHeight)
 56 |         layout.headerReferenceSize = CGSize(width: collectionMargin, height: 0)
 57 |         layout.footerReferenceSize = CGSize(width: collectionMargin, height: 0)
 58 |         
 59 |         layout.minimumLineSpacing = itemSpacing
 60 |         layout.scrollDirection = .horizontal
 61 |         collectionView!.collectionViewLayout = layout
 62 |         collectionView?.decelerationRate = UIScrollViewDecelerationRateFast
 63 |     
 64 |         
 65 |     }
 66 |     
 67 |     func numberOfSections(in collectionView: UICollectionView) -> Int {
 68 |         return 1
 69 |     }
 70 |     
 71 |     func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
 72 |         self.pageControl.numberOfPages = items.count
 73 |         return items.count
 74 |     }
 75 |     
 76 |     func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
 77 |         
 78 |         let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier,
 79 |                                                       for: indexPath) as! CustomCollectionViewCell
 80 |         
 81 |         // Configure the cell
 82 |         cell.titleLabel.text = items[indexPath.row]
 83 |         
 84 |         return cell
 85 |     }
 86 |     
 87 |     
 88 |     // MARK: - UIScrollViewDelegate protocol
 89 |     
 90 |     func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
 91 |         
 92 |         let pageWidth = Float(itemWidth + itemSpacing)
 93 |         let targetXContentOffset = Float(targetContentOffset.pointee.x)
 94 |         let contentWidth = Float(collectionView!.contentSize.width  )
 95 |         var newPage = Float(self.pageControl.currentPage)
 96 |         
 97 |         if velocity.x == 0 {
 98 |             newPage = floor( (targetXContentOffset - Float(pageWidth) / 2) / Float(pageWidth)) + 1.0
 99 |         } else {
100 |             newPage = Float(velocity.x > 0 ? self.pageControl.currentPage + 1 : self.pageControl.currentPage - 1)
101 |             if newPage < 0 {
102 |                 newPage = 0
103 |             }
104 |             if (newPage > contentWidth / pageWidth) {
105 |                 newPage = ceil(contentWidth / pageWidth) - 1.0
106 |             }
107 |         }
108 |         
109 |         self.pageControl.currentPage = Int(newPage)
110 |         let point = CGPoint (x: CGFloat(newPage * pageWidth), y: targetContentOffset.pointee.y)
111 |         targetContentOffset.pointee = point
112 |     }
113 | 
114 | }
115 | 
116 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | 
 2 | 
 3 | #Custom UICollectionView 
 4 | 
 5 | *Create custom UICollectionViewLayoutWith with a custom paging size of UICollectionViewCell by overriding scrollViewWillEndDragging*
 6 | 
 7 | ![alt text](https://github.com/damienromito/CollectionViewCustom/blob/master/image.jpg "custom UICollectionViewCell size")
 8 | 
 9 | ```swift
10 | let collectionMargin = CGFloat(16)
11 | let itemSpacing = CGFloat(10)
12 | let itemHeight = CGFloat(322)
13 | var itemWidth = CGFloat(0)
14 | var currentItem = 0
15 | ```
16 | 
17 | ## 1 Custom CollectionViewLayout
18 | 
19 | ```swift
20 | override func viewDidLoad() {
21 |     super.viewDidLoad()
22 |     
23 |     let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
24 | 
25 |     itemWidth =  UIScreen.main.bounds.width - collectionMargin * 2.0
26 |     
27 |     layout.sectionInset = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
28 |     layout.itemSize = CGSize(width: itemWidth, height: itemHeight)
29 |     layout.headerReferenceSize = CGSize(width: collectionMargin, height: 0)
30 |     layout.footerReferenceSize = CGSize(width: collectionMargin, height: 0)
31 |     layout.minimumLineSpacing = itemSpacing
32 |     layout.scrollDirection = .horizontal
33 | 
34 |     collectionView!.collectionViewLayout = layout
35 |     collectionView?.decelerationRate = UIScrollViewDecelerationRateFast
36 | 
37 | }
38 | ```
39 | 
40 | 
41 | ## 2 Custom Paging size
42 | 
43 | ```swift 
44 | func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
45 |     
46 |     let pageWidth = Float(itemWidth + itemSpacing)
47 |     let targetXContentOffset = Float(targetContentOffset.pointee.x)
48 |     let contentWidth = Float(collectionView!.contentSize.width  )
49 |     var newPage = Float(self.pageControl.currentPage)
50 |     
51 |     if velocity.x == 0 {
52 |         newPage = floor( (targetXContentOffset - Float(pageWidth) / 2) / Float(pageWidth)) + 1.0
53 |     } else {
54 |         newPage = Float(velocity.x > 0 ? self.pageControl.currentPage + 1 : self.pageControl.currentPage - 1)
55 |         if newPage < 0 {
56 |             newPage = 0
57 |         }
58 |         if (newPage > contentWidth / pageWidth) {
59 |             newPage = ceil(contentWidth / pageWidth) - 1.0
60 |         }
61 |     }
62 |     self.pageControl.currentPage = Int(newPage)
63 |     let point = CGPoint (x: CGFloat(newPage * pageWidth), y: targetContentOffset.pointee.y)
64 |     targetContentOffset.pointee = point
65 | }
66 | ```
67 |     


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/image.jpg:
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https://raw.githubusercontent.com/damienromito/CollectionViewCustom/077d533cb5114da706a575ca88af8a3f93dd55c3/image.jpg


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