├── .bundle └── config ├── .gitignore ├── Gemfile ├── Gemfile.lock ├── LICENSE.md ├── README.md ├── Source ├── Extensions.swift ├── ScalingGridLayout.swift ├── ScalingLayoutProtocol.swift └── ZoomCollectionView.swift ├── ZoomCollectionView.podspec ├── ZoomCollectionView.xcodeproj └── project.pbxproj ├── ZoomCollectionView ├── AppDelegate.swift ├── Assets.xcassets │ └── AppIcon.appiconset │ │ └── Contents.json ├── Base.lproj │ ├── LaunchScreen.storyboard │ └── Main.storyboard ├── Info.plist └── ViewController.swift ├── scale-default.png └── scale-zoomed.png /.bundle/config: -------------------------------------------------------------------------------- 1 | --- 2 | BUNDLE_PATH: "Vendor/Bundle" 3 | BUNDLE_DISABLE_SHARED_GEMS: "true" 4 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Xcode 2 | .DS_Store 3 | build/ 4 | *.pbxuser 5 | !default.pbxuser 6 | *.mode1v3 7 | !default.mode1v3 8 | *.mode2v3 9 | !default.mode2v3 10 | *.perspectivev3 11 | !default.perspectivev3 12 | *.xcworkspace 13 | !default.xcworkspace 14 | xcuserdata 15 | profile 16 | *.moved-aside 17 | DerivedData 18 | .idea/ 19 | # Pods - for those of you who use CocoaPods 20 | Pods 21 | Vendor/ 22 | -------------------------------------------------------------------------------- /Gemfile: -------------------------------------------------------------------------------- 1 | # frozen_string_literal: true 2 | source "https://rubygems.org" 3 | 4 | # gem "rails" 5 | 6 | gem "cocoapods", "~> 1.0" 7 | -------------------------------------------------------------------------------- /Gemfile.lock: -------------------------------------------------------------------------------- 1 | GEM 2 | remote: https://rubygems.org/ 3 | specs: 4 | CFPropertyList (2.3.6) 5 | activesupport (4.2.10) 6 | i18n (~> 0.7) 7 | minitest (~> 5.1) 8 | thread_safe (~> 0.3, >= 0.3.4) 9 | tzinfo (~> 1.1) 10 | claide (1.0.2) 11 | cocoapods (1.3.1) 12 | activesupport (>= 4.0.2, < 5) 13 | claide (>= 1.0.2, < 2.0) 14 | cocoapods-core (= 1.3.1) 15 | cocoapods-deintegrate (>= 1.0.1, < 2.0) 16 | cocoapods-downloader (>= 1.1.3, < 2.0) 17 | cocoapods-plugins (>= 1.0.0, < 2.0) 18 | cocoapods-search (>= 1.0.0, < 2.0) 19 | cocoapods-stats (>= 1.0.0, < 2.0) 20 | cocoapods-trunk (>= 1.2.0, < 2.0) 21 | cocoapods-try (>= 1.1.0, < 2.0) 22 | colored2 (~> 3.1) 23 | escape (~> 0.0.4) 24 | fourflusher (~> 2.0.1) 25 | gh_inspector (~> 1.0) 26 | molinillo (~> 0.5.7) 27 | nap (~> 1.0) 28 | ruby-macho (~> 1.1) 29 | xcodeproj (>= 1.5.1, < 2.0) 30 | cocoapods-core (1.3.1) 31 | activesupport (>= 4.0.2, < 6) 32 | fuzzy_match (~> 2.0.4) 33 | nap (~> 1.0) 34 | cocoapods-deintegrate (1.0.1) 35 | cocoapods-downloader (1.1.3) 36 | cocoapods-plugins (1.0.0) 37 | nap 38 | cocoapods-search (1.0.0) 39 | cocoapods-stats (1.0.0) 40 | cocoapods-trunk (1.3.0) 41 | nap (>= 0.8, < 2.0) 42 | netrc (~> 0.11) 43 | cocoapods-try (1.1.0) 44 | colored2 (3.1.2) 45 | concurrent-ruby (1.0.5) 46 | escape (0.0.4) 47 | fourflusher (2.0.1) 48 | fuzzy_match (2.0.4) 49 | gh_inspector (1.0.3) 50 | i18n (0.9.1) 51 | concurrent-ruby (~> 1.0) 52 | minitest (5.10.3) 53 | molinillo (0.5.7) 54 | nanaimo (0.2.3) 55 | nap (1.1.0) 56 | netrc (0.11.0) 57 | ruby-macho (1.1.0) 58 | thread_safe (0.3.6) 59 | tzinfo (1.2.4) 60 | thread_safe (~> 0.1) 61 | xcodeproj (1.5.4) 62 | CFPropertyList (~> 2.3.3) 63 | claide (>= 1.0.2, < 2.0) 64 | colored2 (~> 3.1) 65 | nanaimo (~> 0.2.3) 66 | 67 | PLATFORMS 68 | ruby 69 | 70 | DEPENDENCIES 71 | cocoapods (~> 1.0) 72 | 73 | BUNDLED WITH 74 | 1.16.1 75 | -------------------------------------------------------------------------------- /LICENSE.md: -------------------------------------------------------------------------------- 1 | The MIT License (MIT) 2 | Copyright (c) 2016 Johan Björk 3 | 4 | Permission is hereby granted, free of charge, to any person obtaining a copy of this 5 | software and associated documentation files (the "Software"), to deal in the Software 6 | without restriction, including without limitation the rights to use, copy, modify, merge, 7 | publish, distribute, sublicense, and/or sell copies of the Software, and to permit 8 | persons to whom the Software is furnished to do so, subject to the following conditions: 9 | 10 | The above copyright notice and this permission notice shall be included in all copies or 11 | substantial portions of the Software. 12 | 13 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING 14 | BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 15 | NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 16 | DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 17 | FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 18 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # ZoomCollectionView for iOS 2 | `UICollectionView` is great, but it is not zoomable (which is rather strange since 3 | it is inherits from `UIScrollView`). This project is an attempt to implement zooming 4 | using custom a `UICollectionViewLayout` which resizes itself to simulate the effect 5 | we know and love from `UIScrollView`. 6 | 7 | Default 8 |   9 |   10 |   11 |   12 | Zoomed 13 | 14 | ## Usage with cocoapods 15 | Add a pod requirement to your podfile: 16 | ```ruby 17 | target 'MyApp' do 18 | ... 19 | pod 'ZoomCollectionView', :git => 'https://github.com/helmutschneider/ZoomCollectionView.git' 20 | ... 21 | end 22 | ``` 23 | Then instantiate the layout & view: 24 | ```swift 25 | class ViewController: UIViewController, UICollectionViewDataSource { 26 | 27 | static let cellId = "CellId" 28 | var zoomView: ZoomCollectionView? 29 | 30 | override func viewDidLoad() { 31 | super.viewDidLoad() 32 | 33 | let itemWidth = (self.view.frame.width - 20.0)/5.0 34 | 35 | // you can also implement your own scaling layout 36 | let layout = ScalingGridLayout( 37 | itemSize: CGSize(width: itemWidth, height: itemWidth), 38 | columns: 5, 39 | itemSpacing: 5.0, 40 | scale: 1.0 41 | ) 42 | 43 | zoomView = ZoomCollectionView( 44 | frame: CGRect(origin: .zero, size: self.view.frame.size), 45 | layout: layout 46 | ) 47 | zoomView!.collectionView.dataSource = self 48 | zoomView!.collectionView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: ViewController.cellId) 49 | zoomView!.collectionView.backgroundColor = .white 50 | 51 | zoomView!.scrollView.minimumZoomScale = 1.0 52 | zoomView!.scrollView.zoomScale = 1.0 53 | zoomView!.scrollView.maximumZoomScale = 4.0 54 | 55 | view.addSubview(zoomView!) 56 | } 57 | 58 | ...UICollectionViewDataSource methods... 59 | 60 | } 61 | ``` 62 | For a complete example, have a look at [ViewController.swift](ZoomCollectionView/ViewController.swift). 63 | 64 | ## How does it work? 65 | `ZoomCollectionView` is a container view that encapsulates three views: 66 | - A `UICollectionView` for the actual collection data 67 | - A `UIScrollView` for the zoom/scroll hooks 68 | - A dummy `UIView` that the scroll view uses for its zooming capabilities 69 | 70 | When the scroll view is zoomed or scrolled it forwards the content offset to 71 | the collection view and the scale factor to the `UICollectionViewLayout` which 72 | implements the following protocol: 73 | 74 | ```swift 75 | public protocol ScalingLayoutProtocol { 76 | func getScale() -> CGFloat 77 | func setScale(_ scale: CGFloat) -> Void 78 | func contentSizeForScale(_ scale: CGFloat) -> CGSize 79 | } 80 | ``` 81 | 82 | How the layout recalculates its attributes is implementation specific but an example 83 | can be found in `ScalingGridLayout`. 84 | 85 | ## What works 86 | - Scrolling 87 | - Zooming 88 | 89 | ## What does not work 90 | - The bounce effect when `minimumZoomScale` or `maximumZoomScale` is reached. The reason for this is that the bounce effect does not trigger `scrollViewDidZoom` in the scroll view. 91 | -------------------------------------------------------------------------------- /Source/Extensions.swift: -------------------------------------------------------------------------------- 1 | import Foundation 2 | import UIKit 3 | 4 | public extension CGSize { 5 | func scale(_ factor: CGFloat) -> CGSize { 6 | let transform = CGAffineTransform(scaleX: factor, y: factor) 7 | return self.applying(transform) 8 | } 9 | } 10 | 11 | public extension CGRect { 12 | func scale(_ factor: CGFloat) -> CGRect { 13 | let transform = CGAffineTransform(scaleX: factor, y: factor) 14 | return self.applying(transform) 15 | } 16 | } 17 | 18 | public extension UICollectionView { 19 | 20 | // credit to http://stackoverflow.com/questions/17704527/uicollectionview-not-removing-old-cells-after-scroll 21 | func getLingeringCells() -> [UICollectionViewCell] { 22 | let visibleRect = CGRect(origin: contentOffset, size: bounds.size) 23 | let visibleCells: [UIView] = self.visibleCells 24 | 25 | return subviews.filter { view in 26 | view is UICollectionViewCell && 27 | visibleRect.intersects(view.frame) && 28 | !visibleCells.contains(view) 29 | } as! [UICollectionViewCell] 30 | } 31 | 32 | func hideLingeringCells() { 33 | getLingeringCells().forEach { $0.isHidden = true } 34 | } 35 | } 36 | -------------------------------------------------------------------------------- /Source/ScalingGridLayout.swift: -------------------------------------------------------------------------------- 1 | import Foundation 2 | import UIKit 3 | 4 | open class ScalingGridLayout : UICollectionViewLayout, ScalingLayoutProtocol { 5 | 6 | open let itemSize: CGSize 7 | open let columns: CGFloat 8 | open let itemSpacing: CGFloat 9 | 10 | private var scale: CGFloat 11 | private var attributes: [UICollectionViewLayoutAttributes] = [] 12 | private var contentSize: CGSize = .zero 13 | 14 | public init(itemSize: CGSize, columns: CGFloat, itemSpacing: CGFloat, scale: CGFloat) { 15 | self.itemSize = itemSize 16 | self.columns = columns 17 | self.itemSpacing = itemSpacing 18 | self.scale = scale 19 | super.init() 20 | } 21 | 22 | required public init?(coder aDecoder: NSCoder) { 23 | fatalError("init(coder:) has not been implemented") 24 | } 25 | 26 | override open var collectionViewContentSize: CGSize { 27 | return contentSize 28 | } 29 | 30 | open func contentSizeForScale(_ scale: CGFloat) -> CGSize { 31 | let itemCount = collectionView!.numberOfItems(inSection: 0) 32 | let rowCount = ceil(CGFloat(itemCount)/CGFloat(columns)) 33 | let sz = CGSize( 34 | width: itemSize.width * columns + itemSpacing * (columns - 1), 35 | height: itemSize.height * rowCount + itemSpacing * (rowCount - 1) 36 | ) 37 | return sz.scale(scale) 38 | } 39 | 40 | override open func prepare() { 41 | super.prepare() 42 | self.contentSize = contentSizeForScale(self.scale) 43 | let itemCount = self.collectionView!.numberOfItems(inSection: 0) 44 | let columnCount = self.columns 45 | 46 | attributes = (0.. [UICollectionViewLayoutAttributes]? { 61 | return attributes.filter { $0.frame.intersects(rect) } 62 | } 63 | 64 | override open func layoutAttributesForItem(at indexPath: IndexPath) -> UICollectionViewLayoutAttributes? { 65 | return attributes.first { $0.indexPath == indexPath } 66 | } 67 | 68 | open func setScale(_ scale: CGFloat) { 69 | self.scale = scale 70 | } 71 | 72 | open func getScale() -> CGFloat { 73 | return self.scale 74 | } 75 | 76 | } 77 | -------------------------------------------------------------------------------- /Source/ScalingLayoutProtocol.swift: -------------------------------------------------------------------------------- 1 | import Foundation 2 | import CoreGraphics 3 | 4 | public protocol ScalingLayoutProtocol { 5 | func getScale() -> CGFloat 6 | func setScale(_ scale: CGFloat) -> Void 7 | func contentSizeForScale(_ scale: CGFloat) -> CGSize 8 | } 9 | -------------------------------------------------------------------------------- /Source/ZoomCollectionView.swift: -------------------------------------------------------------------------------- 1 | import Foundation 2 | import UIKit 3 | 4 | open class ZoomCollectionView : UIView, UIScrollViewDelegate, UICollectionViewDelegate { 5 | 6 | open let collectionView: UICollectionView 7 | open let scrollView: UIScrollView 8 | open let dummyZoomView: UIView 9 | open let layout: UICollectionViewLayout 10 | 11 | public init(frame: CGRect, layout: UICollectionViewLayout) { 12 | collectionView = UICollectionView(frame: frame, collectionViewLayout: layout) 13 | scrollView = UIScrollView(frame: frame) 14 | dummyZoomView = UIView(frame: .zero) 15 | 16 | self.layout = layout 17 | 18 | super.init(frame: frame) 19 | 20 | // remove gesture recognizers from the collection 21 | // view and use the scroll views built-in instead. 22 | collectionView.gestureRecognizers?.forEach { collectionView.removeGestureRecognizer($0) } 23 | 24 | scrollView.delegate = self 25 | collectionView.delegate = self 26 | 27 | addSubview(collectionView) 28 | addSubview(scrollView) 29 | scrollView.addSubview(dummyZoomView) 30 | 31 | // bounce is currently not supported since the 32 | // animation does not call scrollViewDidZoom 33 | scrollView.bouncesZoom = false 34 | 35 | bringSubview(toFront: scrollView) 36 | } 37 | 38 | required public init?(coder aDecoder: NSCoder) { 39 | fatalError("init(coder:) has not been implemented") 40 | } 41 | 42 | open override func layoutSubviews() { 43 | super.layoutSubviews() 44 | 45 | if let layout = self.layout as? ScalingLayoutProtocol { 46 | let size = layout.contentSizeForScale(scrollView.zoomScale) 47 | scrollView.contentSize = size 48 | dummyZoomView.frame = CGRect(origin: .zero, size: size) 49 | } 50 | } 51 | 52 | open func viewForZooming(in scrollView: UIScrollView) -> UIView? { 53 | return dummyZoomView 54 | } 55 | 56 | open func scrollViewDidScroll(_ scrollView: UIScrollView) { 57 | collectionView.contentOffset = scrollView.contentOffset 58 | collectionView.hideLingeringCells() 59 | } 60 | 61 | open func scrollViewDidZoom(_ scrollView: UIScrollView) { 62 | if let layout = self.layout as? ScalingLayoutProtocol, layout.getScale() != scrollView.zoomScale { 63 | layout.setScale(scrollView.zoomScale) 64 | self.layout.invalidateLayout() 65 | collectionView.contentOffset = scrollView.contentOffset 66 | collectionView.hideLingeringCells() 67 | } 68 | } 69 | 70 | open func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) { 71 | // cells might have been hidden by hideLingeringCells() so we must un-hide them. 72 | cell.isHidden = false 73 | } 74 | 75 | } 76 | -------------------------------------------------------------------------------- /ZoomCollectionView.podspec: -------------------------------------------------------------------------------- 1 | # 2 | # Be sure to run `pod spec lint ZoomCollectionView.podspec' to ensure this is a 3 | # valid spec and to remove all comments including this before submitting the spec. 4 | # 5 | # To learn more about Podspec attributes see http://docs.cocoapods.org/specification.html 6 | # To see working Podspecs in the CocoaPods repo see https://github.com/CocoaPods/Specs/ 7 | # 8 | 9 | Pod::Spec.new do |s| 10 | 11 | # ――― Spec Metadata ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――― # 12 | # 13 | # These will help people to find your library, and whilst it 14 | # can feel like a chore to fill in it's definitely to your advantage. The 15 | # summary should be tweet-length, and the description more in depth. 16 | # 17 | 18 | s.name = "ZoomCollectionView" 19 | s.version = "0.1" 20 | s.summary = "Zoomable collection view for iOS" 21 | 22 | # This description is used to generate tags and improve search results. 23 | # * Think: What does it do? Why did you write it? What is the focus? 24 | # * Try to keep it short, snappy and to the point. 25 | # * Write the description between the DESC delimiters below. 26 | # * Finally, don't worry about the indent, CocoaPods strips it! 27 | # s.description = <<-DESC 28 | # DESC 29 | 30 | s.homepage = "https://github.com/helmutschneider/ZoomCollectionView" 31 | # s.screenshots = "www.example.com/screenshots_1.gif", "www.example.com/screenshots_2.gif" 32 | 33 | 34 | # ――― Spec License ――――――――――――――――――――――――――――――――――――――――――――――――――――――――――― # 35 | # 36 | # Licensing your code is important. See http://choosealicense.com for more info. 37 | # CocoaPods will detect a license file if there is a named LICENSE* 38 | # Popular ones are 'MIT', 'BSD' and 'Apache License, Version 2.0'. 39 | # 40 | 41 | s.license = "MIT" 42 | # s.license = { :type => "MIT", :file => "FILE_LICENSE" } 43 | 44 | 45 | # ――― Author Metadata ――――――――――――――――――――――――――――――――――――――――――――――――――――――――― # 46 | # 47 | # Specify the authors of the library, with email addresses. Email addresses 48 | # of the authors are extracted from the SCM log. E.g. $ git log. CocoaPods also 49 | # accepts just a name if you'd rather not provide an email address. 50 | # 51 | # Specify a social_media_url where others can refer to, for example a twitter 52 | # profile URL. 53 | # 54 | 55 | s.author = { "Johan Björk" => "johanimon@gmail.com" } 56 | # Or just: s.author = "Johan Björk" 57 | # s.authors = { "Johan Björk" => "johanimon@gmail.com" } 58 | # s.social_media_url = "http://twitter.com/Johan Björk" 59 | 60 | # ――― Platform Specifics ――――――――――――――――――――――――――――――――――――――――――――――――――――――― # 61 | # 62 | # If this Pod runs only on iOS or OS X, then specify the platform and 63 | # the deployment target. You can optionally include the target after the platform. 64 | # 65 | 66 | # s.platform = :ios 67 | s.platform = :ios, "8.0" 68 | 69 | # When using multiple platforms 70 | # s.ios.deployment_target = "5.0" 71 | # s.osx.deployment_target = "10.7" 72 | # s.watchos.deployment_target = "2.0" 73 | # s.tvos.deployment_target = "9.0" 74 | 75 | 76 | # ――― Source Location ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――― # 77 | # 78 | # Specify the location from where the source should be retrieved. 79 | # Supports git, hg, bzr, svn and HTTP. 80 | # 81 | 82 | s.source = { :git => "https://github.com/helmutschneider/ZoomCollectionView.git" } 83 | 84 | 85 | # ――― Source Code ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――― # 86 | # 87 | # CocoaPods is smart about how it includes source code. For source files 88 | # giving a folder will include any swift, h, m, mm, c & cpp files. 89 | # For header files it will include any header in the folder. 90 | # Not including the public_header_files will make all headers public. 91 | # 92 | 93 | s.source_files = "Source/**/*.{swift}" 94 | # s.exclude_files = "Classes/Exclude" 95 | 96 | # s.public_header_files = "Classes/**/*.h" 97 | 98 | 99 | # ――― Resources ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――――― # 100 | # 101 | # A list of resources included with the Pod. These are copied into the 102 | # target bundle with a build phase script. Anything else will be cleaned. 103 | # You can preserve files from being cleaned, please don't preserve 104 | # non-essential files like tests, examples and documentation. 105 | # 106 | 107 | # s.resource = "icon.png" 108 | # s.resources = "Resources/*.png" 109 | 110 | # s.preserve_paths = "FilesToSave", "MoreFilesToSave" 111 | 112 | 113 | # ――― Project Linking ―――――――――――――――――――――――――――――――――――――――――――――――――――――――――― # 114 | # 115 | # Link your library with frameworks, or libraries. Libraries do not include 116 | # the lib prefix of their name. 117 | # 118 | 119 | # s.framework = "SomeFramework" 120 | # s.frameworks = "SomeFramework", "AnotherFramework" 121 | 122 | # s.library = "iconv" 123 | # s.libraries = "iconv", "xml2" 124 | 125 | 126 | # ――― Project Settings ――――――――――――――――――――――――――――――――――――――――――――――――――――――――― # 127 | # 128 | # If your library depends on compiler flags you can set them in the xcconfig hash 129 | # where they will only apply to your library. 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341 | }; 342 | 047CBDD11DCFD00D0043E7B2 /* Build configuration list for PBXNativeTarget "ZoomCollectionView" */ = { 343 | isa = XCConfigurationList; 344 | buildConfigurations = ( 345 | 047CBDD21DCFD00D0043E7B2 /* Debug */, 346 | 047CBDD31DCFD00D0043E7B2 /* Release */, 347 | ); 348 | defaultConfigurationIsVisible = 0; 349 | defaultConfigurationName = Release; 350 | }; 351 | /* End XCConfigurationList section */ 352 | }; 353 | rootObject = 047CBDB71DCFD00D0043E7B2 /* Project object */; 354 | } 355 | -------------------------------------------------------------------------------- /ZoomCollectionView/AppDelegate.swift: -------------------------------------------------------------------------------- 1 | import UIKit 2 | 3 | @UIApplicationMain 4 | class AppDelegate: UIResponder, UIApplicationDelegate { 5 | 6 | var window: UIWindow? 7 | 8 | 9 | func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool { 10 | // Override point for customization after application launch. 11 | return true 12 | } 13 | 14 | func applicationWillResignActive(_ application: UIApplication) { 15 | // 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. 16 | // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game. 17 | } 18 | 19 | func applicationDidEnterBackground(_ application: UIApplication) { 20 | // 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. 21 | // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits. 22 | } 23 | 24 | func applicationWillEnterForeground(_ application: UIApplication) { 25 | // 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. 26 | } 27 | 28 | func applicationDidBecomeActive(_ application: UIApplication) { 29 | // 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. 30 | } 31 | 32 | func applicationWillTerminate(_ application: UIApplication) { 33 | // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:. 34 | } 35 | 36 | 37 | } 38 | -------------------------------------------------------------------------------- /ZoomCollectionView/Assets.xcassets/AppIcon.appiconset/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "images" : [ 3 | { 4 | "idiom" : "iphone", 5 | "size" : "20x20", 6 | "scale" : "2x" 7 | }, 8 | { 9 | "idiom" : "iphone", 10 | "size" : "20x20", 11 | "scale" : "3x" 12 | }, 13 | { 14 | "idiom" : "iphone", 15 | "size" : "29x29", 16 | "scale" : "2x" 17 | }, 18 | { 19 | "idiom" : "iphone", 20 | "size" : "29x29", 21 | "scale" : "3x" 22 | }, 23 | { 24 | "idiom" : "iphone", 25 | "size" : "40x40", 26 | "scale" : "2x" 27 | }, 28 | { 29 | "idiom" : "iphone", 30 | "size" : "40x40", 31 | "scale" : "3x" 32 | }, 33 | { 34 | "idiom" : "iphone", 35 | "size" : "60x60", 36 | "scale" : "2x" 37 | }, 38 | { 39 | "idiom" : "iphone", 40 | "size" : "60x60", 41 | "scale" : "3x" 42 | } 43 | ], 44 | "info" : { 45 | "version" : 1, 46 | "author" : "xcode" 47 | } 48 | } -------------------------------------------------------------------------------- /ZoomCollectionView/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 | -------------------------------------------------------------------------------- /ZoomCollectionView/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 | -------------------------------------------------------------------------------- /ZoomCollectionView/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 | 38 | 39 | -------------------------------------------------------------------------------- /ZoomCollectionView/ViewController.swift: -------------------------------------------------------------------------------- 1 | import UIKit 2 | 3 | class ViewController: UIViewController, UICollectionViewDataSource { 4 | 5 | static let cellId = "CellId" 6 | 7 | var zoomView: ZoomCollectionView? 8 | 9 | override func viewDidLoad() { 10 | super.viewDidLoad() 11 | 12 | let itemWidth = (self.view.frame.width - 20.0)/5.0 13 | let layout = ScalingGridLayout( 14 | itemSize: CGSize(width: itemWidth, height: itemWidth), 15 | columns: 5, 16 | itemSpacing: 5.0, 17 | scale: 1.0 18 | ) 19 | 20 | zoomView = ZoomCollectionView( 21 | frame: CGRect(origin: .zero, size: self.view.frame.size), 22 | layout: layout 23 | ) 24 | zoomView!.collectionView.dataSource = self 25 | zoomView!.collectionView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: ViewController.cellId) 26 | zoomView!.collectionView.backgroundColor = .white 27 | 28 | zoomView!.scrollView.minimumZoomScale = 1.0 29 | zoomView!.scrollView.zoomScale = 1.0 30 | zoomView!.scrollView.maximumZoomScale = 4.0 31 | 32 | view.addSubview(zoomView!) 33 | } 34 | 35 | override func didReceiveMemoryWarning() { 36 | super.didReceiveMemoryWarning() 37 | // Dispose of any resources that can be recreated. 38 | } 39 | 40 | func numberOfSections(in collectionView: UICollectionView) -> Int { 41 | return 1 42 | } 43 | 44 | func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { 45 | return 100 46 | } 47 | 48 | func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { 49 | let cell = collectionView.dequeueReusableCell(withReuseIdentifier: ViewController.cellId, for: indexPath) 50 | cell.backgroundColor = indexPath.row % 2 == 0 ? .orange : .blue 51 | 52 | return cell 53 | } 54 | 55 | } 56 | 57 | -------------------------------------------------------------------------------- /scale-default.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/helmutschneider/ZoomCollectionView/5d94f87cc58b6f7477d72845c4f7edeaac074eba/scale-default.png -------------------------------------------------------------------------------- /scale-zoomed.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/helmutschneider/ZoomCollectionView/5d94f87cc58b6f7477d72845c4f7edeaac074eba/scale-zoomed.png --------------------------------------------------------------------------------