├── screencast.gif ├── CollectionViewMultiColumnLayout.xcodeproj ├── project.xcworkspace │ └── contents.xcworkspacedata ├── xcuserdata │ └── vincent.xcuserdatad │ │ └── xcschemes │ │ ├── xcschememanagement.plist │ │ └── CollectionViewMultiColumnLayoutDemo.xcscheme ├── xcshareddata │ └── xcschemes │ │ └── CollectionViewMultiColumnLayout.xcscheme └── project.pbxproj ├── CollectionViewMultiColumnLayout ├── CollectionViewMultiColumnLayout.h ├── Info.plist └── CollectionViewMultiColumnLayout.swift ├── CollectionViewMultiColumnLayoutTests ├── Info.plist └── CollectionViewMultiColumnLayoutTests.swift ├── CollectionViewMultiColumnLayoutDemo ├── Assets.xcassets │ └── AppIcon.appiconset │ │ └── Contents.json ├── Info.plist ├── Base.lproj │ ├── LaunchScreen.storyboard │ └── Main.storyboard ├── AppDelegate.swift └── ViewController.swift ├── .gitignore ├── README.md └── LICENSE /screencast.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/regexident/CollectionViewMultiColumnLayout/HEAD/screencast.gif -------------------------------------------------------------------------------- /CollectionViewMultiColumnLayout.xcodeproj/project.xcworkspace/contents.xcworkspacedata: -------------------------------------------------------------------------------- 1 | 2 | 4 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /CollectionViewMultiColumnLayout/CollectionViewMultiColumnLayout.h: -------------------------------------------------------------------------------- 1 | // 2 | // CollectionViewMultiColumnLayout.h 3 | // CollectionViewMultiColumnLayout 4 | // 5 | // Created by Vincent Esche on 5/18/17. 6 | // Copyright © 2017 Vincent Esche. All rights reserved. 7 | // 8 | 9 | #import 10 | 11 | //! Project version number for CollectionViewMultiColumnLayout. 12 | FOUNDATION_EXPORT double CollectionViewMultiColumnLayoutVersionNumber; 13 | 14 | //! Project version string for CollectionViewMultiColumnLayout. 15 | FOUNDATION_EXPORT const unsigned char CollectionViewMultiColumnLayoutVersionString[]; 16 | 17 | // In this header, you should import all the public headers of your framework using statements like #import 18 | 19 | 20 | -------------------------------------------------------------------------------- /CollectionViewMultiColumnLayoutTests/Info.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleExecutable 8 | $(EXECUTABLE_NAME) 9 | CFBundleIdentifier 10 | $(PRODUCT_BUNDLE_IDENTIFIER) 11 | CFBundleInfoDictionaryVersion 12 | 6.0 13 | CFBundleName 14 | $(PRODUCT_NAME) 15 | CFBundlePackageType 16 | BNDL 17 | CFBundleShortVersionString 18 | 1.0 19 | CFBundleVersion 20 | 1 21 | 22 | 23 | -------------------------------------------------------------------------------- /CollectionViewMultiColumnLayout/Info.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleExecutable 8 | $(EXECUTABLE_NAME) 9 | CFBundleIdentifier 10 | $(PRODUCT_BUNDLE_IDENTIFIER) 11 | CFBundleInfoDictionaryVersion 12 | 6.0 13 | CFBundleName 14 | $(PRODUCT_NAME) 15 | CFBundlePackageType 16 | FMWK 17 | CFBundleShortVersionString 18 | 1.0 19 | CFBundleVersion 20 | $(CURRENT_PROJECT_VERSION) 21 | NSPrincipalClass 22 | 23 | 24 | 25 | -------------------------------------------------------------------------------- /CollectionViewMultiColumnLayout.xcodeproj/xcuserdata/vincent.xcuserdatad/xcschemes/xcschememanagement.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | SchemeUserState 6 | 7 | CollectionViewMultiColumnLayout.xcscheme_^#shared#^_ 8 | 9 | orderHint 10 | 0 11 | 12 | CollectionViewMultiColumnLayoutDemo.xcscheme 13 | 14 | orderHint 15 | 1 16 | 17 | 18 | SuppressBuildableAutocreation 19 | 20 | BF3D88D61ECDB5DA00E1AC1B 21 | 22 | primary 23 | 24 | 25 | BF3D88DF1ECDB5DA00E1AC1B 26 | 27 | primary 28 | 29 | 30 | BF3D88F61ECDC6B600E1AC1B 31 | 32 | primary 33 | 34 | 35 | 36 | 37 | 38 | -------------------------------------------------------------------------------- /CollectionViewMultiColumnLayoutTests/CollectionViewMultiColumnLayoutTests.swift: -------------------------------------------------------------------------------- 1 | // 2 | // CollectionViewMultiColumnLayoutTests.swift 3 | // CollectionViewMultiColumnLayoutTests 4 | // 5 | // Created by Vincent Esche on 5/18/17. 6 | // Copyright © 2017 Vincent Esche. All rights reserved. 7 | // 8 | 9 | import XCTest 10 | @testable import CollectionViewMultiColumnLayout 11 | 12 | class CollectionViewMultiColumnLayoutTests: XCTestCase { 13 | 14 | override func setUp() { 15 | super.setUp() 16 | // Put setup code here. This method is called before the invocation of each test method in the class. 17 | } 18 | 19 | override func tearDown() { 20 | // Put teardown code here. This method is called after the invocation of each test method in the class. 21 | super.tearDown() 22 | } 23 | 24 | func testExample() { 25 | // This is an example of a functional test case. 26 | // Use XCTAssert and related functions to verify your tests produce the correct results. 27 | } 28 | 29 | func testPerformanceExample() { 30 | // This is an example of a performance test case. 31 | self.measure { 32 | // Put the code you want to measure the time of here. 33 | } 34 | } 35 | 36 | } 37 | -------------------------------------------------------------------------------- /CollectionViewMultiColumnLayoutDemo/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 | } -------------------------------------------------------------------------------- /CollectionViewMultiColumnLayoutDemo/Info.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleExecutable 8 | $(EXECUTABLE_NAME) 9 | CFBundleIdentifier 10 | $(PRODUCT_BUNDLE_IDENTIFIER) 11 | CFBundleInfoDictionaryVersion 12 | 6.0 13 | CFBundleName 14 | $(PRODUCT_NAME) 15 | CFBundlePackageType 16 | APPL 17 | CFBundleShortVersionString 18 | 1.0 19 | CFBundleVersion 20 | 1 21 | LSRequiresIPhoneOS 22 | 23 | UILaunchStoryboardName 24 | LaunchScreen 25 | UIMainStoryboardFile 26 | Main 27 | UIRequiredDeviceCapabilities 28 | 29 | armv7 30 | 31 | UISupportedInterfaceOrientations 32 | 33 | UIInterfaceOrientationPortrait 34 | UIInterfaceOrientationLandscapeLeft 35 | UIInterfaceOrientationLandscapeRight 36 | 37 | UISupportedInterfaceOrientations~ipad 38 | 39 | UIInterfaceOrientationPortrait 40 | UIInterfaceOrientationPortraitUpsideDown 41 | UIInterfaceOrientationLandscapeLeft 42 | UIInterfaceOrientationLandscapeRight 43 | 44 | 45 | 46 | -------------------------------------------------------------------------------- /CollectionViewMultiColumnLayoutDemo/Base.lproj/LaunchScreen.storyboard: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | 2 | # Created by https://www.gitignore.io/api/swift 3 | 4 | ### Swift ### 5 | # Xcode 6 | # 7 | # gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore 8 | 9 | ## Build generated 10 | build/ 11 | DerivedData/ 12 | 13 | ## Various settings 14 | *.pbxuser 15 | !default.pbxuser 16 | *.mode1v3 17 | !default.mode1v3 18 | *.mode2v3 19 | !default.mode2v3 20 | *.perspectivev3 21 | !default.perspectivev3 22 | xcuserdata/ 23 | 24 | ## Other 25 | *.moved-aside 26 | *.xccheckout 27 | *.xcscmblueprint 28 | 29 | ## Obj-C/Swift specific 30 | *.hmap 31 | *.ipa 32 | *.dSYM.zip 33 | *.dSYM 34 | 35 | ## Playgrounds 36 | timeline.xctimeline 37 | playground.xcworkspace 38 | 39 | # Swift Package Manager 40 | # 41 | # Add this line if you want to avoid checking in source code from Swift Package Manager dependencies. 42 | # Packages/ 43 | # Package.pins 44 | .build/ 45 | 46 | # CocoaPods - Refactored to standalone file 47 | 48 | # Carthage - Refactored to standalone file 49 | 50 | # fastlane 51 | # 52 | # It is recommended to not store the screenshots in the git repo. Instead, use fastlane to re-generate the 53 | # screenshots whenever they are needed. 54 | # For more information about the recommended setup visit: 55 | # https://docs.fastlane.tools/best-practices/source-control/#source-control 56 | 57 | fastlane/report.xml 58 | fastlane/Preview.html 59 | fastlane/screenshots 60 | fastlane/test_output 61 | 62 | ### Swift.CocoaPods Stack ### 63 | ## CocoaPods GitIgnore Template 64 | 65 | # CocoaPods - Only use to conserve bandwidth / Save time on Pushing 66 | # - Also handy if you have a lage number of dependant pods 67 | # - AS PER https://guides.cocoapods.org/using/using-cocoapods.html NEVER IGONRE THE LOCK FILE 68 | Pods/ 69 | 70 | ### Swift.Carthage Stack ### 71 | # Carthage 72 | # 73 | # Add this line if you want to avoid checking in source code from Carthage dependencies. 74 | # Carthage/Checkouts 75 | 76 | Carthage/Build 77 | 78 | # End of https://www.gitignore.io/api/swift 79 | 80 | .DS_Store 81 | -------------------------------------------------------------------------------- /CollectionViewMultiColumnLayoutDemo/AppDelegate.swift: -------------------------------------------------------------------------------- 1 | // 2 | // AppDelegate.swift 3 | // CollectionViewMultiColumnLayoutDemo 4 | // 5 | // Created by Vincent Esche on 5/18/17. 6 | // Copyright © 2017 Vincent Esche. 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 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # CollectionViewMultiColumnLayout 2 | 3 | **CollectionViewMultiColumnLayout** is a `UICollectionViewLayout` that resembles a tiled waterfall/mosaic layout (as seen all over the web), with support of multiple columns per section and explicitly assigning a section's items to specific columns: 4 | 5 | ![screencast](screencast.gif) 6 | 7 | ## Usage 8 | 9 | ```swift 10 | import CollectionViewMultiColumnLayout 11 | 12 | class CollectionViewController: UICollectionViewController { 13 | 14 | // ... 15 | 16 | override func viewDidLoad() { 17 | super.viewDidLoad() 18 | let layout = CollectionViewMultiColumnLayout() 19 | collectionView.setCollectionViewLayout(layout, animated: false) 20 | } 21 | } 22 | 23 | extension CollectionViewController: CollectionViewMultiColumnLayoutDataSource { 24 | 25 | func collectionView(_ collectionView: UICollectionView, numberOfColumnsInSection section: Int) -> Int { 26 | // ... 27 | } 28 | 29 | func collectionView(_ collectionView: UICollectionView, columnForItemAt indexPath: NSIndexPath) -> Int? { 30 | // ... 31 | } 32 | } 33 | 34 | extension CollectionViewController: CollectionViewMultiColumnLayoutDelegate { 35 | 36 | func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize { 37 | // ... 38 | } 39 | 40 | // Optional methods: 41 | 42 | func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, heightForHeaderInSection section: Int) -> CGFloat { 43 | // ... 44 | } 45 | 46 | func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, heightForFooterInSection section: Int) -> CGFloat { 47 | // ... 48 | } 49 | 50 | func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, insetForSection section: Int) -> UIEdgeInsets { 51 | // ... 52 | } 53 | 54 | func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, insetForHeaderInSection section: Int) -> UIEdgeInsets { 55 | // ... 56 | } 57 | 58 | func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, insetForFooterInSection section: Int) -> UIEdgeInsets { 59 | // ... 60 | } 61 | 62 | func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, minimumInteritemSpacingForSection section: Int) -> CGFloat { 63 | // ... 64 | } 65 | } 66 | ``` 67 | 68 | ## Installation 69 | 70 | The recommended way to add **CollectionViewMultiColumnLayout** to your project is via [Carthage](https://github.com/Carthage/Carthage): 71 | 72 | github 'regexident/CollectionViewMultiColumnLayout' 73 | 74 | ## License 75 | 76 | **CollectionViewMultiColumnLayout** is available under the **MPL-2 license**. See the `LICENSE` file for more info. 77 | -------------------------------------------------------------------------------- /CollectionViewMultiColumnLayoutDemo/Base.lproj/Main.storyboard: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 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 | -------------------------------------------------------------------------------- /CollectionViewMultiColumnLayout.xcodeproj/xcuserdata/vincent.xcuserdatad/xcschemes/CollectionViewMultiColumnLayoutDemo.xcscheme: -------------------------------------------------------------------------------- 1 | 2 | 5 | 8 | 9 | 15 | 21 | 22 | 23 | 24 | 25 | 30 | 31 | 32 | 33 | 39 | 40 | 41 | 42 | 43 | 44 | 54 | 56 | 62 | 63 | 64 | 65 | 66 | 67 | 73 | 75 | 81 | 82 | 83 | 84 | 86 | 87 | 90 | 91 | 92 | -------------------------------------------------------------------------------- /CollectionViewMultiColumnLayout.xcodeproj/xcshareddata/xcschemes/CollectionViewMultiColumnLayout.xcscheme: -------------------------------------------------------------------------------- 1 | 2 | 5 | 8 | 9 | 15 | 21 | 22 | 23 | 24 | 25 | 30 | 31 | 33 | 39 | 40 | 41 | 42 | 43 | 49 | 50 | 51 | 52 | 53 | 54 | 64 | 65 | 71 | 72 | 73 | 74 | 75 | 76 | 82 | 83 | 89 | 90 | 91 | 92 | 94 | 95 | 98 | 99 | 100 | -------------------------------------------------------------------------------- /CollectionViewMultiColumnLayoutDemo/ViewController.swift: -------------------------------------------------------------------------------- 1 | // 2 | // ViewController.swift 3 | // CollectionViewMultiColumnLayoutDemo 4 | // 5 | // Created by Vincent Esche on 5/18/17. 6 | // Copyright © 2017 Vincent Esche. All rights reserved. 7 | // 8 | 9 | import UIKit 10 | 11 | import CollectionViewMultiColumnLayout 12 | 13 | class CollectionViewController: UICollectionViewController { 14 | 15 | enum ReuseIdentifier: String { 16 | case cell = "Cell" 17 | case headerReuseIdentifier = "Header" 18 | case footerReuseIdentifier = "Footer" 19 | } 20 | fileprivate static let cellReuseIdentifier = "Cell" 21 | fileprivate static let headerReuseIdentifier = "Header" 22 | fileprivate static let footerReuseIdentifier = "Footer" 23 | 24 | override func viewDidLoad() { 25 | super.viewDidLoad() 26 | 27 | // Uncomment the following line to preserve selection between presentations 28 | // self.clearsSelectionOnViewWillAppear = false 29 | 30 | guard let collectionView = self.collectionView else { 31 | return 32 | } 33 | 34 | // Register cell classes 35 | collectionView.register( 36 | UICollectionViewCell.self, 37 | forCellWithReuseIdentifier: CollectionViewController.cellReuseIdentifier 38 | ) 39 | collectionView.register( 40 | UICollectionReusableView.self, 41 | forSupplementaryViewOfKind: UICollectionElementKindSectionHeader, 42 | withReuseIdentifier: CollectionViewController.headerReuseIdentifier 43 | ) 44 | collectionView.register( 45 | UICollectionReusableView.self, 46 | forSupplementaryViewOfKind: UICollectionElementKindSectionFooter, 47 | withReuseIdentifier: CollectionViewController.footerReuseIdentifier 48 | ) 49 | 50 | let layout = CollectionViewMultiColumnLayout() 51 | collectionView.setCollectionViewLayout(layout, animated: false) 52 | 53 | // Do any additional setup after loading the view. 54 | } 55 | } 56 | 57 | extension CollectionViewController /*: UICollectionViewDataSource */ { 58 | 59 | override func numberOfSections(in collectionView: UICollectionView) -> Int { 60 | return 3 61 | } 62 | 63 | override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { 64 | switch section { 65 | case 0: return 2 66 | case 1: return 4 67 | case 2: return 5 68 | case _: return 0 69 | } 70 | } 71 | 72 | override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { 73 | let cell = collectionView.dequeueReusableCell( 74 | withReuseIdentifier: CollectionViewController.cellReuseIdentifier, 75 | for: indexPath 76 | ) 77 | 78 | let column = self.collectionView(collectionView, columnForItemAt: indexPath as NSIndexPath)! 79 | cell.backgroundColor = [.darkGray, .gray, .lightGray][column % 3] 80 | 81 | return cell 82 | } 83 | 84 | override func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView { 85 | 86 | let reuseIdentifier: String = { 87 | switch kind { 88 | case UICollectionElementKindSectionHeader: 89 | return CollectionViewController.headerReuseIdentifier 90 | case UICollectionElementKindSectionFooter: 91 | return CollectionViewController.footerReuseIdentifier 92 | case _: fatalError("Unrecognized UICollectionElementKind: '\(kind)'") 93 | } 94 | }() 95 | 96 | let supplementaryView = collectionView.dequeueReusableSupplementaryView( 97 | ofKind: kind, 98 | withReuseIdentifier: reuseIdentifier, 99 | for: indexPath 100 | ) 101 | 102 | // Configure the cell 103 | 104 | switch kind { 105 | case UICollectionElementKindSectionHeader: 106 | supplementaryView.backgroundColor = .blue 107 | case UICollectionElementKindSectionFooter: 108 | supplementaryView.backgroundColor = .green 109 | case _: break 110 | } 111 | 112 | return supplementaryView 113 | } 114 | 115 | // MARK: UICollectionViewDelegate 116 | 117 | /* 118 | // Uncomment this method to specify if the specified item should be highlighted during tracking 119 | override func collectionView(_ collectionView: UICollectionView, shouldHighlightItemAt indexPath: IndexPath) -> Bool { 120 | return true 121 | } 122 | */ 123 | 124 | /* 125 | // Uncomment this method to specify if the specified item should be selected 126 | override func collectionView(_ collectionView: UICollectionView, shouldSelectItemAt indexPath: IndexPath) -> Bool { 127 | return true 128 | } 129 | */ 130 | 131 | /* 132 | // Uncomment these methods to specify if an action menu should be displayed for the specified item, and react to actions performed on the item 133 | override func collectionView(_ collectionView: UICollectionView, shouldShowMenuForItemAt indexPath: IndexPath) -> Bool { 134 | return false 135 | } 136 | 137 | override func collectionView(_ collectionView: UICollectionView, canPerformAction action: Selector, forItemAt indexPath: IndexPath, withSender sender: Any?) -> Bool { 138 | return false 139 | } 140 | 141 | override func collectionView(_ collectionView: UICollectionView, performAction action: Selector, forItemAt indexPath: IndexPath, withSender sender: Any?) { 142 | 143 | } 144 | */ 145 | 146 | } 147 | 148 | extension CollectionViewController: CollectionViewMultiColumnLayoutDataSource { 149 | 150 | func collectionView(_ collectionView: UICollectionView, numberOfColumnsInSection section: Int) -> Int { 151 | switch section { 152 | case 0: return 1 153 | case 1: return 2 154 | case 2: return 3 155 | case _: return 0 156 | } 157 | } 158 | 159 | func collectionView(_ collectionView: UICollectionView, columnForItemAt indexPath: NSIndexPath) -> Int? { 160 | return indexPath.item % (indexPath.section + 1) 161 | } 162 | } 163 | 164 | extension CollectionViewController: CollectionViewMultiColumnLayoutDelegate { 165 | 166 | func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize { 167 | let height = CGFloat(arc4random_uniform(20)) + 10.0 168 | return CGSize(width: 30.0, height: height) 169 | } 170 | 171 | func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, heightForHeaderInSection section: Int) -> CGFloat { 172 | return 0.0 173 | } 174 | 175 | func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, heightForFooterInSection section: Int) -> CGFloat { 176 | return 0.0 177 | } 178 | 179 | func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, insetForSection section: Int) -> UIEdgeInsets { 180 | return UIEdgeInsets(top: 10.0, left: 10.0, bottom: 10.0, right: 10.0) 181 | } 182 | 183 | // func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, insetForHeaderInSection section: Int) -> UIEdgeInsets 184 | // func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, insetForFooterInSection section: Int) -> UIEdgeInsets 185 | 186 | func collectionView(_ collectionView: UICollectionView, layout: UICollectionViewLayout, minimumInteritemSpacingForSection section: Int) -> CGFloat { 187 | return 10.0 188 | } 189 | } 190 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Mozilla Public License, version 2.0 1. Definitions 1.1. “Contributor” means each individual or legal entity that creates, contributes to the creation of, or owns Covered Software. 2 | 3 | 1.2. “Contributor Version” means the combination of the Contributions of others (if any) used by a Contributor and that particular Contributor’s Contribution. 4 | 5 | 1.3. “Contribution” means Covered Software of a particular Contributor. 6 | 7 | 1.4. “Covered Software” means Source Code Form to which the initial Contributor has attached the notice in Exhibit A, the Executable Form of such Source Code Form, and Modifications of such Source Code Form, in each case including portions thereof. 8 | 9 | 1.5. “Incompatible With Secondary Licenses” means 10 | 11 | that the initial Contributor has attached the notice described in Exhibit B to the Covered Software; or 12 | 13 | that the Covered Software was made available under the terms of version 1.1 or earlier of the License, but not also under the terms of a Secondary License. 14 | 15 | 1.6. “Executable Form” means any form of the work other than Source Code Form. 16 | 17 | 1.7. “Larger Work” means a work that combines Covered Software with other material, in a separate file or files, that is not Covered Software. 18 | 19 | 1.8. “License” means this document. 20 | 21 | 1.9. “Licensable” means having the right to grant, to the maximum extent possible, whether at the time of the initial grant or subsequently, any and all of the rights conveyed by this License. 22 | 23 | 1.10. “Modifications” means any of the following: 24 | 25 | any file in Source Code Form that results from an addition to, deletion from, or modification of the contents of Covered Software; or 26 | 27 | any new file in Source Code Form that contains any Covered Software. 28 | 29 | 1.11. “Patent Claims” of a Contributor means any patent claim(s), including without limitation, method, process, and apparatus claims, in any patent Licensable by such Contributor that would be infringed, but for the grant of the License, by the making, using, selling, offering for sale, having made, import, or transfer of either its Contributions or its Contributor Version. 30 | 31 | 1.12. “Secondary License” means either the GNU General Public License, Version 2.0, the GNU Lesser General Public License, Version 2.1, the GNU Affero General Public License, Version 3.0, or any later versions of those licenses. 32 | 33 | 1.13. “Source Code Form” means the form of the work preferred for making modifications. 34 | 35 | 1.14. “You” (or “Your”) means an individual or a legal entity exercising rights under this License. For legal entities, “You” includes any entity that controls, is controlled by, or is under common control with You. For purposes of this definition, “control” means (a) the power, direct or indirect, to cause the direction or management of such entity, whether by contract or otherwise, or (b) ownership of more than fifty percent (50%) of the outstanding shares or beneficial ownership of such entity. 36 | 37 | 2. License Grants and Conditions 2.1. Grants Each Contributor hereby grants You a world-wide, royalty-free, non-exclusive license: 38 | 39 | under intellectual property rights (other than patent or trademark) Licensable by such Contributor to use, reproduce, make available, modify, display, perform, distribute, and otherwise exploit its Contributions, either on an unmodified basis, with Modifications, or as part of a Larger Work; and 40 | 41 | under Patent Claims of such Contributor to make, use, sell, offer for sale, have made, import, and otherwise transfer either its Contributions or its Contributor Version. 42 | 43 | 2.2. Effective Date The licenses granted in Section 2.1 with respect to any Contribution become effective for each Contribution on the date the Contributor first distributes such Contribution. 44 | 45 | 2.3. Limitations on Grant Scope The licenses granted in this Section 2 are the only rights granted under this License. No additional rights or licenses will be implied from the distribution or licensing of Covered Software under this License. Notwithstanding Section 2.1(b) above, no patent license is granted by a Contributor: 46 | 47 | for any code that a Contributor has removed from Covered Software; or 48 | 49 | for infringements caused by: (i) Your and any other third party’s modifications of Covered Software, or (ii) the combination of its Contributions with other software (except as part of its Contributor Version); or 50 | 51 | under Patent Claims infringed by Covered Software in the absence of its Contributions. 52 | 53 | This License does not grant any rights in the trademarks, service marks, or logos of any Contributor (except as may be necessary to comply with the notice requirements in Section 3.4). 54 | 55 | 2.4. Subsequent Licenses No Contributor makes additional grants as a result of Your choice to distribute the Covered Software under a subsequent version of this License (see Section 10.2) or under the terms of a Secondary License (if permitted under the terms of Section 3.3). 56 | 57 | 2.5. Representation Each Contributor represents that the Contributor believes its Contributions are its original creation(s) or it has sufficient rights to grant the rights to its Contributions conveyed by this License. 58 | 59 | 2.6. Fair Use This License is not intended to limit any rights You have under applicable copyright doctrines of fair use, fair dealing, or other equivalents. 60 | 61 | 2.7. Conditions Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in Section 2.1. 62 | 63 | 3. Responsibilities 3.1. Distribution of Source Form All distribution of Covered Software in Source Code Form, including any Modifications that You create or to which You contribute, must be under the terms of this License. You must inform recipients that the Source Code Form of the Covered Software is governed by the terms of this License, and how they can obtain a copy of this License. You may not attempt to alter or restrict the recipients’ rights in the Source Code Form. 64 | 65 | 3.2. Distribution of Executable Form If You distribute Covered Software in Executable Form then: 66 | 67 | such Covered Software must also be made available in Source Code Form, as described in Section 3.1, and You must inform recipients of the Executable Form how they can obtain a copy of such Source Code Form by reasonable means in a timely manner, at a charge no more than the cost of distribution to the recipient; and 68 | 69 | You may distribute such Executable Form under the terms of this License, or sublicense it under different terms, provided that the license for the Executable Form does not attempt to limit or alter the recipients’ rights in the Source Code Form under this License. 70 | 71 | 3.3. Distribution of a Larger Work You may create and distribute a Larger Work under terms of Your choice, provided that You also comply with the requirements of this License for the Covered Software. If the Larger Work is a combination of Covered Software with a work governed by one or more Secondary Licenses, and the Covered Software is not Incompatible With Secondary Licenses, this License permits You to additionally distribute such Covered Software under the terms of such Secondary License(s), so that the recipient of the Larger Work may, at their option, further distribute the Covered Software under the terms of either this License or such Secondary License(s). 72 | 73 | 3.4. Notices You may not remove or alter the substance of any license notices (including copyright notices, patent notices, disclaimers of warranty, or limitations of liability) contained within the Source Code Form of the Covered Software, except that You may alter any license notices to the extent required to remedy known factual inaccuracies. 74 | 75 | 3.5. Application of Additional Terms You may choose to offer, and to charge a fee for, warranty, support, indemnity or liability obligations to one or more recipients of Covered Software. However, You may do so only on Your own behalf, and not on behalf of any Contributor. You must make it absolutely clear that any such warranty, support, indemnity, or liability obligation is offered by You alone, and You hereby agree to indemnify every Contributor for any liability incurred by such Contributor as a result of warranty, support, indemnity or liability terms You offer. You may include additional disclaimers of warranty and limitations of liability specific to any jurisdiction. 76 | 77 | 4. Inability to Comply Due to Statute or Regulation If it is impossible for You to comply with any of the terms of this License with respect to some or all of the Covered Software due to statute, judicial order, or regulation then You must: (a) comply with the terms of this License to the maximum extent possible; and (b) describe the limitations and the code they affect. Such description must be placed in a text file included with all distributions of the Covered Software under this License. Except to the extent prohibited by statute or regulation, such description must be sufficiently detailed for a recipient of ordinary skill to be able to understand it. 78 | 79 | 5. Termination 5.1. The rights granted under this License will terminate automatically if You fail to comply with any of its terms. However, if You become compliant, then the rights granted under this License from a particular Contributor are reinstated (a) provisionally, unless and until such Contributor explicitly and finally terminates Your grants, and (b) on an ongoing basis, if such Contributor fails to notify You of the non-compliance by some reasonable means prior to 60 days after You have come back into compliance. Moreover, Your grants from a particular Contributor are reinstated on an ongoing basis if such Contributor notifies You of the non-compliance by some reasonable means, this is the first time You have received notice of non-compliance with this License from such Contributor, and You become compliant prior to 30 days after Your receipt of the notice. 80 | 81 | 5.2. If You initiate litigation against any entity by asserting a patent infringement claim (excluding declaratory judgment actions, counter-claims, and cross-claims) alleging that a Contributor Version directly or indirectly infringes any patent, then the rights granted to You by any and all Contributors for the Covered Software under Section 2.1 of this License shall terminate. 82 | 83 | 5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user license agreements (excluding distributors and resellers) which have been validly granted by You or Your distributors under this License prior to termination shall survive termination. 84 | 85 | 6. Disclaimer of Warranty Covered Software is provided under this License on an “as is” basis, without warranty of any kind, either expressed, implied, or statutory, including, without limitation, warranties that the Covered Software is free of defects, merchantable, fit for a particular purpose or non-infringing. The entire risk as to the quality and performance of the Covered Software is with You. Should any Covered Software prove defective in any respect, You (not any Contributor) assume the cost of any necessary servicing, repair, or correction. This disclaimer of warranty constitutes an essential part of this License. No use of any Covered Software is authorized under this License except under this disclaimer. 86 | 87 | 7. Limitation of Liability Under no circumstances and under no legal theory, whether tort (including negligence), contract, or otherwise, shall any Contributor, or anyone who distributes Covered Software as permitted above, be liable to You for any direct, indirect, special, incidental, or consequential damages of any character including, without limitation, damages for lost profits, loss of goodwill, work stoppage, computer failure or malfunction, or any and all other commercial damages or losses, even if such party shall have been informed of the possibility of such damages. This limitation of liability shall not apply to liability for death or personal injury resulting from such party’s negligence to the extent applicable law prohibits such limitation. Some jurisdictions do not allow the exclusion or limitation of incidental or consequential damages, so this exclusion and limitation may not apply to You. 88 | 89 | 8. Litigation Any litigation relating to this License may be brought only in the courts of a jurisdiction where the defendant maintains its principal place of business and such litigation shall be governed by laws of that jurisdiction, without reference to its conflict-of-law provisions. Nothing in this Section shall prevent a party’s ability to bring cross-claims or counter-claims. 90 | 91 | 9. Miscellaneous This License represents the complete agreement concerning the subject matter hereof. If any provision of this License is held to be unenforceable, such provision shall be reformed only to the extent necessary to make it enforceable. Any law or regulation which provides that the language of a contract shall be construed against the drafter shall not be used to construe this License against a Contributor. 92 | 93 | 10. Versions of the License 10.1. New Versions Mozilla Foundation is the license steward. Except as provided in Section 10.3, no one other than the license steward has the right to modify or publish new versions of this License. Each version will be given a distinguishing version number. 94 | 95 | 10.2. Effect of New Versions You may distribute the Covered Software under the terms of the version of the License under which You originally received the Covered Software, or under the terms of any subsequent version published by the license steward. 96 | 97 | 10.3. Modified Versions If you create software not governed by this License, and you want to create a new license for such software, you may create and use a modified version of this License if you rename the license and remove any references to the name of the license steward (except to note that such modified license differs from this License). 98 | 99 | 10.4. Distributing Source Code Form that is Incompatible With Secondary Licenses If You choose to distribute Source Code Form that is Incompatible With Secondary Licenses under the terms of this version of the License, the notice described in Exhibit B of this License must be attached. 100 | 101 | Exhibit A - Source Code Form License Notice This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/. 102 | 103 | If it is not possible or desirable to put the notice in a particular file, then You may include the notice in a location (such as a LICENSE file in a relevant directory) where a recipient would be likely to look for such a notice. 104 | 105 | You may add additional accurate notices of copyright ownership. 106 | 107 | Exhibit B - “Incompatible With Secondary Licenses” Notice This Source Code Form is “Incompatible With Secondary Licenses”, as defined by the Mozilla Public License, v. 2.0. 108 | -------------------------------------------------------------------------------- /CollectionViewMultiColumnLayout/CollectionViewMultiColumnLayout.swift: -------------------------------------------------------------------------------- 1 | // 2 | // CollectionViewMultiColumnLayout.swift 3 | // CollectionViewMultiColumnLayout 4 | // 5 | // Created by Vincent Esche on 5/18/17. 6 | // Copyright © 2017 Vincent Esche. All rights reserved. 7 | // 8 | // This Source Code Form is subject to the terms of the Mozilla Public 9 | // License, v. 2.0. If a copy of the MPL was not distributed with this 10 | // file, You can obtain one at http://mozilla.org/MPL/2.0/. 11 | // 12 | // Based on https://github.com/chiahsien/CHTCollectionViewWaterfallLayout (MIT License) 13 | 14 | import UIKit 15 | 16 | public protocol CollectionViewMultiColumnLayoutDataSource: UICollectionViewDataSource { 17 | 18 | func collectionView( 19 | _ collectionView: UICollectionView, 20 | numberOfColumnsInSection section: Int 21 | ) -> Int 22 | 23 | func collectionView( 24 | _ collectionView: UICollectionView, 25 | columnForItemAt indexPath: NSIndexPath 26 | ) -> Int? 27 | } 28 | 29 | @objc public protocol CollectionViewMultiColumnLayoutDelegate: UICollectionViewDelegate { 30 | 31 | func collectionView( 32 | _ collectionView: UICollectionView, 33 | layout: UICollectionViewLayout, 34 | sizeForItemAtIndexPath indexPath: NSIndexPath 35 | ) -> CGSize 36 | 37 | @objc optional func collectionView( 38 | _ collectionView: UICollectionView, 39 | layout: UICollectionViewLayout, 40 | heightForHeaderInSection section: Int 41 | ) -> CGFloat 42 | 43 | @objc optional func collectionView( 44 | _ collectionView: UICollectionView, 45 | layout: UICollectionViewLayout, 46 | heightForFooterInSection section: Int 47 | ) -> CGFloat 48 | 49 | @objc optional func collectionView( 50 | _ collectionView: UICollectionView, 51 | layout: UICollectionViewLayout, 52 | minimumInteritemSpacingForSection section: Int 53 | ) -> CGFloat 54 | 55 | @objc optional func collectionView( 56 | _ collectionView: UICollectionView, 57 | layout: UICollectionViewLayout, 58 | insetForSection section: Int 59 | ) -> UIEdgeInsets 60 | 61 | @objc optional func collectionView( 62 | _ collectionView: UICollectionView, 63 | layout: UICollectionViewLayout, 64 | insetForHeaderInSection section: Int 65 | ) -> UIEdgeInsets 66 | 67 | @objc optional func collectionView( 68 | _ collectionView: UICollectionView, 69 | layout: UICollectionViewLayout, 70 | insetForFooterInSection section: Int 71 | ) -> UIEdgeInsets 72 | } 73 | 74 | public class CollectionViewMultiColumnLayout: UICollectionViewLayout { 75 | 76 | /// How many items to be union into a single rectangle 77 | private let unionSize = 20; 78 | 79 | public var minimumColumnSpacing: CGFloat = 10.0 { 80 | didSet { 81 | self.invalidateIfNecessary(old: oldValue, new: self.minimumColumnSpacing) 82 | } 83 | } 84 | 85 | public var minimumInteritemSpacing: CGFloat = 10.0 { 86 | didSet { 87 | self.invalidateIfNecessary(old: oldValue, new: self.minimumInteritemSpacing) 88 | } 89 | } 90 | 91 | public var headerHeight: CGFloat = 0.0 { 92 | didSet { 93 | self.invalidateIfNecessary(old: oldValue, new: self.headerHeight) 94 | } 95 | } 96 | 97 | public var footerHeight: CGFloat = 0.0 { 98 | didSet { 99 | self.invalidateIfNecessary(old: oldValue, new: self.footerHeight) 100 | } 101 | } 102 | 103 | public var headerInsets: UIEdgeInsets = .zero { 104 | didSet { 105 | self.invalidateIfNecessary(old: oldValue, new: self.headerInsets) 106 | } 107 | } 108 | 109 | public var footerInsets: UIEdgeInsets = .zero { 110 | didSet { 111 | self.invalidateIfNecessary(old: oldValue, new: self.footerInsets) 112 | } 113 | } 114 | 115 | public var sectionInsets: UIEdgeInsets = .zero { 116 | didSet { 117 | self.invalidateIfNecessary(old: oldValue, new: self.sectionInsets) 118 | } 119 | } 120 | 121 | private var dataSource: CollectionViewMultiColumnLayoutDataSource? { 122 | guard let defaultDataSource = self.collectionView?.delegate else { 123 | return nil 124 | } 125 | guard let dataSource = defaultDataSource as? CollectionViewMultiColumnLayoutDataSource else { 126 | let name = String(describing: CollectionViewMultiColumnLayoutDataSource.self) 127 | print("UICollectionView's dataSource should conform to \(name) protocol") 128 | return nil 129 | } 130 | return dataSource 131 | } 132 | 133 | private var delegate: CollectionViewMultiColumnLayoutDelegate? { 134 | guard let defaultDelegate = self.collectionView?.delegate else { 135 | return nil 136 | } 137 | guard let delegate = defaultDelegate as? CollectionViewMultiColumnLayoutDelegate else { 138 | let name = String(describing: CollectionViewMultiColumnLayoutDelegate.self) 139 | print("UICollectionView's delegate should conform to \(name) protocol") 140 | return nil 141 | } 142 | return delegate 143 | } 144 | 145 | private var sectionItemAttributes: [[UICollectionViewLayoutAttributes]] = [] 146 | private var allItemAttributes: [UICollectionViewLayoutAttributes] = [] 147 | private var headersAttribute: [Int : UICollectionViewLayoutAttributes] = [:] 148 | private var footersAttribute: [Int : UICollectionViewLayoutAttributes] = [:] 149 | private var sectionRects: [Int : CGRect] = [:] 150 | private var contentHeight: CGFloat = 0.0 151 | 152 | override public func prepare() { 153 | super.prepare() 154 | 155 | guard let collectionView = self.collectionView else { 156 | return 157 | } 158 | 159 | guard let delegate = self.delegate else { 160 | return 161 | } 162 | 163 | guard let dataSource = self.dataSource else { 164 | return 165 | } 166 | 167 | self.headersAttribute.removeAll(keepingCapacity: false) 168 | self.footersAttribute.removeAll(keepingCapacity: false) 169 | self.sectionRects.removeAll(keepingCapacity: false) 170 | self.allItemAttributes.removeAll(keepingCapacity: false) 171 | self.sectionItemAttributes.removeAll(keepingCapacity: false) 172 | 173 | let numberOfSections = collectionView.numberOfSections 174 | guard numberOfSections > 0 else { 175 | return; 176 | } 177 | 178 | var top: CGFloat = 0.0 179 | var attributes: UICollectionViewLayoutAttributes 180 | 181 | var contentHeight: CGFloat = 0.0 182 | 183 | for section in 0.. 0, "Number of columns should be greater than 0.") 189 | 190 | var columnHeights: [CGFloat] = Array(repeating: 0.0, count: numberOfColumns) 191 | 192 | var sectionRect: CGRect = .null 193 | 194 | // MARK: Section metrics 195 | 196 | let minimumInteritemSpacing = delegate.collectionView?( 197 | collectionView, 198 | layout: self, 199 | minimumInteritemSpacingForSection: section 200 | ) ?? self.minimumInteritemSpacing 201 | 202 | let sectionInsets = delegate.collectionView?( 203 | collectionView, 204 | layout: self, 205 | insetForSection: section 206 | ) ?? self.sectionInsets 207 | 208 | let width = collectionView.frame.width - sectionInsets.left - sectionInsets.right 209 | let columnSpacing = (CGFloat(numberOfColumns) - 1.0) * self.minimumColumnSpacing 210 | let itemWidth = floor((width - columnSpacing) / CGFloat(numberOfColumns)) 211 | 212 | // MARK: Section header 213 | 214 | let headerHeight = delegate.collectionView?( 215 | collectionView, 216 | layout: self, 217 | heightForHeaderInSection: section 218 | ) ?? self.headerHeight 219 | 220 | let headerInsets = delegate.collectionView?( 221 | collectionView, 222 | layout: self, 223 | insetForHeaderInSection: section 224 | ) ?? self.headerInsets 225 | 226 | top += headerInsets.top 227 | 228 | if headerHeight > 0 { 229 | let indexPath = IndexPath(item: 0, section: section) 230 | attributes = UICollectionViewLayoutAttributes( 231 | forSupplementaryViewOfKind: UICollectionElementKindSectionHeader, 232 | with: indexPath 233 | ) 234 | attributes.frame = CGRect( 235 | x: headerInsets.left, 236 | y: top, 237 | width: collectionView.frame.width - (headerInsets.left + headerInsets.right), 238 | height: headerHeight 239 | ) 240 | self.headersAttribute[section] = attributes 241 | sectionRect = sectionRect.union(attributes.frame) 242 | top = attributes.frame.maxY + headerInsets.bottom 243 | } 244 | 245 | top += sectionInsets.top 246 | for idx in 0.. 0 && itemSize.width > 0 { 273 | itemHeight = itemSize.height * itemWidth / itemSize.width 274 | } 275 | 276 | attributes = UICollectionViewLayoutAttributes(forCellWith: indexPath) 277 | attributes.frame = CGRect( 278 | origin: CGPoint(x: xOffset, y: yOffset), 279 | size: CGSize(width: itemWidth, height: itemHeight) 280 | ) 281 | itemAttributes.append(attributes) 282 | self.allItemAttributes.append(attributes) 283 | sectionRect = sectionRect.union(attributes.frame) 284 | columnHeights[column] = attributes.frame.maxY + minimumInteritemSpacing 285 | } 286 | 287 | self.sectionItemAttributes.append(itemAttributes) 288 | 289 | // MARK: Section footer 290 | 291 | let columnIndex = longestColumnIndex(columnHeights) 292 | top = columnHeights[columnIndex] - minimumInteritemSpacing + sectionInsets.bottom 293 | 294 | let footerHeight = delegate.collectionView?( 295 | collectionView, 296 | layout: self, 297 | heightForFooterInSection: section 298 | ) ?? self.footerHeight 299 | 300 | let footerInsets = delegate.collectionView?( 301 | collectionView, 302 | layout: self, 303 | insetForFooterInSection: section 304 | ) ?? self.footerInsets 305 | 306 | top += footerInsets.top 307 | 308 | if footerHeight > 0 { 309 | let indexPath = IndexPath(item: 0, section: section) 310 | attributes = UICollectionViewLayoutAttributes( 311 | forSupplementaryViewOfKind: UICollectionElementKindSectionFooter, 312 | with: indexPath 313 | ) 314 | attributes.frame = CGRect( 315 | x: footerInsets.left, 316 | y: top, 317 | width: collectionView.frame.width - (footerInsets.left + footerInsets.right), 318 | height: footerHeight 319 | ) 320 | self.footersAttribute[section] = attributes 321 | self.allItemAttributes.append(attributes) 322 | sectionRect = sectionRect.union(attributes.frame) 323 | top = attributes.frame.maxY + footerInsets.bottom 324 | } 325 | 326 | contentHeight = top 327 | self.sectionRects[section] = sectionRect 328 | } 329 | 330 | self.contentHeight = contentHeight 331 | } 332 | 333 | override public var collectionViewContentSize: CGSize { 334 | guard let collectionView = self.collectionView else { 335 | return .zero 336 | } 337 | guard collectionView.numberOfSections > 0 else { 338 | return .zero 339 | } 340 | var contentSize = collectionView.bounds.size 341 | contentSize.height = self.contentHeight 342 | return contentSize 343 | } 344 | 345 | override public func layoutAttributesForItem(at indexPath: IndexPath) -> UICollectionViewLayoutAttributes? { 346 | guard indexPath.section < self.sectionItemAttributes.count else { 347 | return nil 348 | } 349 | guard indexPath.item < self.sectionItemAttributes[indexPath.section].count else { 350 | return nil 351 | } 352 | return self.sectionItemAttributes[indexPath.section][indexPath.item] 353 | } 354 | 355 | override public func layoutAttributesForSupplementaryView( 356 | ofKind elementKind: String, 357 | at indexPath: IndexPath 358 | ) -> UICollectionViewLayoutAttributes? { 359 | switch elementKind { 360 | case UICollectionElementKindSectionHeader: 361 | return self.headersAttribute[indexPath.section] 362 | case UICollectionElementKindSectionFooter: 363 | return self.footersAttribute[indexPath.section] 364 | case _: 365 | return nil 366 | } 367 | } 368 | 369 | override public func layoutAttributesForElements( 370 | in rect: CGRect 371 | ) -> [UICollectionViewLayoutAttributes] { 372 | return Array(self.sectionRects.lazy.flatMap { section, sectionRect in 373 | sectionRect.intersects(rect) ? self.sectionItemAttributes[section] : nil 374 | }.joined()) 375 | } 376 | 377 | override public func shouldInvalidateLayout(forBoundsChange newBounds: CGRect) -> Bool { 378 | guard let collectionView = self.collectionView else { 379 | return false 380 | } 381 | let oldBounds = collectionView.bounds 382 | if newBounds.width != oldBounds.width { 383 | return true 384 | } 385 | return false 386 | } 387 | 388 | private func shortestColumnIndex(_ columnHeights: [CGFloat]) -> Int { 389 | return columnHeights.enumerated().min { $0.1 < $1.1 }!.0 390 | } 391 | 392 | private func longestColumnIndex(_ columnHeights: [CGFloat]) -> Int { 393 | return columnHeights.enumerated().max { $0.1 < $1.1 }!.0 394 | } 395 | 396 | private func invalidateIfNecessary(old: T, new: T) where T: Equatable { 397 | if old != new { 398 | self.invalidateLayout() 399 | } 400 | } 401 | } 402 | -------------------------------------------------------------------------------- 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