├── gifs ├── header.gif ├── nested.gif ├── touch.gif └── infinite.gif ├── ScrollViewPlay ├── ScrollViewPlay │ ├── Images.xcassets │ │ ├── Infinite scrolling │ │ │ ├── rocket1.imageset │ │ │ │ ├── rocket.png │ │ │ │ └── Contents.json │ │ │ ├── rocket4.imageset │ │ │ │ ├── rocket-1.png │ │ │ │ └── Contents.json │ │ │ ├── rocket3.imageset │ │ │ │ ├── rocket_1__.png │ │ │ │ └── Contents.json │ │ │ └── rocket2.imageset │ │ │ │ ├── space-rocket-512.png │ │ │ │ └── Contents.json │ │ ├── AppIcon.appiconset │ │ │ ├── Screen Shot 2015-07-06 at 16.09.57.png │ │ │ ├── Screen Shot 2015-07-06 at 16.09.57 2.png │ │ │ ├── Screen Shot 2015-07-06 at 16.09.57 4.png │ │ │ ├── Screen Shot 2015-07-06 at 16.09.57 2-1.png │ │ │ ├── Screen Shot 2015-07-06 at 16.09.57 2-2.png │ │ │ ├── Screen Shot 2015-07-06 at 16.09.57 2-3.png │ │ │ └── Contents.json │ │ └── Header View Zooming │ │ │ ├── stars.imageset │ │ │ ├── hubble-space-wallpapers.jpg │ │ │ └── Contents.json │ │ │ └── rockets.imageset │ │ │ ├── 2000px-Flag_of_Romania.svg.png │ │ │ └── Contents.json │ ├── ScrollViewPlay-BridgingHeader.h │ ├── HeaderZoomViewController.swift │ ├── OverlayScrollView.swift │ ├── InfiniteScrollViewController.swift │ ├── TouchDelayRecognizer.swift │ ├── Info.plist │ ├── AppDelegate.swift │ ├── TableViewController.swift │ ├── DynamicCollectionLayout.swift │ ├── DotView.swift │ ├── HeaderZoomScrollView.swift │ ├── NestedScrollViewController.swift │ ├── Base.lproj │ │ ├── LaunchScreen.xib │ │ └── Main.storyboard │ ├── ScrollableCell.swift │ ├── ScrollTouchViewController.swift │ └── InfiniteScrollView.swift ├── ScrollViewPlay.xcodeproj │ ├── project.xcworkspace │ │ └── contents.xcworkspacedata │ └── project.pbxproj ├── ScrollViewPlay-BridgingHeader.h └── ScrollViewPlayTests │ ├── Info.plist │ └── ScrollViewPlayTests.swift ├── .gitignore ├── README.md └── LICENSE /gifs/header.gif: -------------------------------------------------------------------------------- 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https://raw.githubusercontent.com/teodorpatras/SrollViewPlay/HEAD/ScrollViewPlay/ScrollViewPlay/Images.xcassets/Header View Zooming/stars.imageset/hubble-space-wallpapers.jpg -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay/Images.xcassets/Header View Zooming/rockets.imageset/2000px-Flag_of_Romania.svg.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/teodorpatras/SrollViewPlay/HEAD/ScrollViewPlay/ScrollViewPlay/Images.xcassets/Header View Zooming/rockets.imageset/2000px-Flag_of_Romania.svg.png -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay-BridgingHeader.h: -------------------------------------------------------------------------------- 1 | // 2 | // ScrollViewPlay-BridgingHeader.h 3 | // ScrollViewPlay 4 | // 5 | // Created by Teodor Patras on 05/07/15. 6 | // Copyright (c) 2015 Teodor Patras. All rights reserved. 7 | // 8 | 9 | #import 10 | -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay/ScrollViewPlay-BridgingHeader.h: -------------------------------------------------------------------------------- 1 | // 2 | // ScrollViewPlay-BridgingHeader.h 3 | // ScrollViewPlay 4 | // 5 | // Created by Teodor Patras on 05/07/15. 6 | // Copyright (c) 2015 Teodor Patras. All rights reserved. 7 | // 8 | 9 | #import 10 | -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay/Images.xcassets/Infinite scrolling/rocket1.imageset/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "images" : [ 3 | { 4 | "idiom" : "universal", 5 | "scale" : "1x" 6 | }, 7 | { 8 | "idiom" : "universal", 9 | "scale" : "2x", 10 | "filename" : "rocket.png" 11 | }, 12 | { 13 | "idiom" : "universal", 14 | "scale" : "3x" 15 | } 16 | ], 17 | "info" : { 18 | "version" : 1, 19 | "author" : "xcode" 20 | } 21 | } -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay/Images.xcassets/Infinite scrolling/rocket3.imageset/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "images" : [ 3 | { 4 | "idiom" : "universal", 5 | "scale" : "1x" 6 | }, 7 | { 8 | "idiom" : "universal", 9 | "scale" : "2x", 10 | "filename" : "rocket_1__.png" 11 | }, 12 | { 13 | "idiom" : "universal", 14 | "scale" : "3x" 15 | } 16 | ], 17 | "info" : { 18 | "version" : 1, 19 | "author" : "xcode" 20 | } 21 | } -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay/Images.xcassets/Infinite scrolling/rocket4.imageset/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "images" : [ 3 | { 4 | "idiom" : "universal", 5 | "scale" : "1x" 6 | }, 7 | { 8 | "idiom" : "universal", 9 | "scale" : "2x", 10 | "filename" : "rocket-1.png" 11 | }, 12 | { 13 | "idiom" : "universal", 14 | "scale" : "3x" 15 | } 16 | ], 17 | "info" : { 18 | "version" : 1, 19 | "author" : "xcode" 20 | } 21 | } -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay/Images.xcassets/Infinite scrolling/rocket2.imageset/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "images" : [ 3 | { 4 | "idiom" : "universal", 5 | "scale" : "1x" 6 | }, 7 | { 8 | "idiom" : "universal", 9 | "scale" : "2x", 10 | "filename" : "space-rocket-512.png" 11 | }, 12 | { 13 | "idiom" : "universal", 14 | "scale" : "3x" 15 | } 16 | ], 17 | "info" : { 18 | "version" : 1, 19 | "author" : "xcode" 20 | } 21 | } -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay/Images.xcassets/Header View Zooming/stars.imageset/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "images" : [ 3 | { 4 | "idiom" : "universal", 5 | "scale" : "1x" 6 | }, 7 | { 8 | "idiom" : "universal", 9 | "scale" : "2x" 10 | }, 11 | { 12 | "idiom" : "universal", 13 | "scale" : "3x", 14 | "filename" : "hubble-space-wallpapers.jpg" 15 | } 16 | ], 17 | "info" : { 18 | "version" : 1, 19 | "author" : "xcode" 20 | } 21 | } -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay/Images.xcassets/Header View Zooming/rockets.imageset/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "images" : [ 3 | { 4 | "idiom" : "universal", 5 | "scale" : "1x" 6 | }, 7 | { 8 | "idiom" : "universal", 9 | "scale" : "2x" 10 | }, 11 | { 12 | "idiom" : "universal", 13 | "scale" : "3x", 14 | "filename" : "2000px-Flag_of_Romania.svg.png" 15 | } 16 | ], 17 | "info" : { 18 | "version" : 1, 19 | "author" : "xcode" 20 | } 21 | } -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay/HeaderZoomViewController.swift: -------------------------------------------------------------------------------- 1 | // 2 | // HeaderZoomViewController.swift 3 | // ScrollViewPlay 4 | // 5 | // Created by Teodor Patras on 02/07/15. 6 | // Copyright (c) 2015 Teodor Patras. All rights reserved. 7 | // 8 | 9 | import UIKit 10 | 11 | class HeaderZoomViewController: UIViewController { 12 | 13 | 14 | @IBOutlet weak var scrollView: HeaderZoomScrollView! 15 | 16 | override func viewDidLoad() { 17 | super.viewDidLoad() 18 | 19 | self.navigationItem.title = "Header view & Zooming"; 20 | } 21 | } 22 | -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay/OverlayScrollView.swift: -------------------------------------------------------------------------------- 1 | // 2 | // OverlayScrollView.swift 3 | // ScrollViewPlay 4 | // 5 | // Created by Teodor Patras on 05/07/15. 6 | // Copyright (c) 2015 Teodor Patras. All rights reserved. 7 | // 8 | 9 | import UIKit 10 | 11 | class OverlayScrollView: UIScrollView { 12 | 13 | override func hitTest(point: CGPoint, withEvent event: UIEvent?) -> UIView? { 14 | let view = super.hitTest(point, withEvent: event) 15 | 16 | if view == self { 17 | return nil 18 | } 19 | 20 | return view 21 | } 22 | 23 | } 24 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Xcode 2 | # 3 | build/ 4 | *.pbxuser 5 | !default.pbxuser 6 | *.mode1v3 7 | !default.mode1v3 8 | *.mode2v3 9 | !default.mode2v3 10 | *.perspectivev3 11 | !default.perspectivev3 12 | xcuserdata 13 | *.xccheckout 14 | *.moved-aside 15 | DerivedData 16 | *.hmap 17 | *.ipa 18 | *.xcuserstate 19 | 20 | # CocoaPods 21 | # 22 | # We recommend against adding the Pods directory to your .gitignore. However 23 | # you should judge for yourself, the pros and cons are mentioned at: 24 | # http://guides.cocoapods.org/using/using-cocoapods.html#should-i-ignore-the-pods-directory-in-source-control 25 | # 26 | # Pods/ 27 | 28 | # Carthage 29 | # 30 | # Add this line if you want to avoid checking in source code from Carthage dependencies. 31 | # Carthage/Checkouts 32 | 33 | Carthage/Build 34 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # SrollViewPlay 2 | Some UIScrollView techniques from the WWDC videos. Written in Swift. Demos implemented: 3 | 4 | ## Infinite scrolling 5 | 6 | Example of infinite scrolling through 4 static image views. 7 | 8 | ![Example](/../master/gifs/infinite.gif) 9 | 10 | ## Header view & zooming 11 | 12 | Example of zooming one of the scroll view subviews and keeping a second one as a header view. 13 | 14 | ![Example](/../master/gifs/header.gif) 15 | 16 | ## Nested scroll views 17 | 18 | Example of nested scrollviews where an inner one pulls the outer one. 19 | 20 | ![Example](/../master/gifs/nested.gif) 21 | 22 | ## Scroll views touch events handling 23 | 24 | Example of handling different touch events between a scroll view, its subview and its sibling. 25 | 26 | ![Example](/../master/gifs/touch.gif) 27 | -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlayTests/Info.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleExecutable 8 | $(EXECUTABLE_NAME) 9 | CFBundleIdentifier 10 | teodorpatras.$(PRODUCT_NAME:rfc1034identifier) 11 | CFBundleInfoDictionaryVersion 12 | 6.0 13 | CFBundleName 14 | $(PRODUCT_NAME) 15 | CFBundlePackageType 16 | BNDL 17 | CFBundleShortVersionString 18 | 1.0 19 | CFBundleSignature 20 | ???? 21 | CFBundleVersion 22 | 1 23 | 24 | 25 | -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay/InfiniteScrollViewController.swift: -------------------------------------------------------------------------------- 1 | // 2 | // InfiniteScrollViewController.swift 3 | // ScrollViewPlay 4 | // 5 | // Created by Teodor Patras on 02/07/15. 6 | // Copyright (c) 2015 Teodor Patras. All rights reserved. 7 | // 8 | 9 | import UIKit 10 | 11 | class InfiniteScrollViewController: UIViewController { 12 | 13 | override func viewDidLoad() { 14 | super.viewDidLoad() 15 | 16 | self.navigationItem.title = "Infinite scrolling" 17 | } 18 | 19 | override func didReceiveMemoryWarning() { 20 | super.didReceiveMemoryWarning() 21 | // Dispose of any resources that can be recreated. 22 | } 23 | 24 | 25 | /* 26 | // MARK: - Navigation 27 | 28 | // In a storyboard-based application, you will often want to do a little preparation before navigation 29 | override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) { 30 | // Get the new view controller using segue.destinationViewController. 31 | // Pass the selected object to the new view controller. 32 | } 33 | */ 34 | 35 | } 36 | -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlayTests/ScrollViewPlayTests.swift: -------------------------------------------------------------------------------- 1 | // 2 | // ScrollViewPlayTests.swift 3 | // ScrollViewPlayTests 4 | // 5 | // Created by Teodor Patras on 02/07/15. 6 | // Copyright (c) 2015 Teodor Patras. All rights reserved. 7 | // 8 | 9 | import UIKit 10 | import XCTest 11 | 12 | class ScrollViewPlayTests: 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 | XCTAssert(true, "Pass") 27 | } 28 | 29 | func testPerformanceExample() { 30 | // This is an example of a performance test case. 31 | self.measureBlock() { 32 | // Put the code you want to measure the time of here. 33 | } 34 | } 35 | 36 | } 37 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | The MIT License (MIT) 2 | 3 | Copyright (c) 2015 Teodor Patraş 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | 23 | -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay/Images.xcassets/AppIcon.appiconset/Contents.json: -------------------------------------------------------------------------------- 1 | { 2 | "images" : [ 3 | { 4 | "size" : "29x29", 5 | "idiom" : "iphone", 6 | "filename" : "Screen Shot 2015-07-06 at 16.09.57 2.png", 7 | "scale" : "2x" 8 | }, 9 | { 10 | "size" : "29x29", 11 | "idiom" : "iphone", 12 | "filename" : "Screen Shot 2015-07-06 at 16.09.57 4.png", 13 | "scale" : "3x" 14 | }, 15 | { 16 | "size" : "40x40", 17 | "idiom" : "iphone", 18 | "filename" : "Screen Shot 2015-07-06 at 16.09.57 2-3.png", 19 | "scale" : "2x" 20 | }, 21 | { 22 | "size" : "40x40", 23 | "idiom" : "iphone", 24 | "filename" : "Screen Shot 2015-07-06 at 16.09.57 2-1.png", 25 | "scale" : "3x" 26 | }, 27 | { 28 | "size" : "60x60", 29 | "idiom" : "iphone", 30 | "filename" : "Screen Shot 2015-07-06 at 16.09.57 2-2.png", 31 | "scale" : "2x" 32 | }, 33 | { 34 | "size" : "60x60", 35 | "idiom" : "iphone", 36 | "filename" : "Screen Shot 2015-07-06 at 16.09.57.png", 37 | "scale" : "3x" 38 | } 39 | ], 40 | "info" : { 41 | "version" : 1, 42 | "author" : "xcode" 43 | } 44 | } -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay/TouchDelayRecognizer.swift: -------------------------------------------------------------------------------- 1 | // 2 | // TouchDelayRecognizer.swift 3 | // ScrollViewPlay 4 | // 5 | // Created by Teodor Patras on 05/07/15. 6 | // Copyright (c) 2015 Teodor Patras. All rights reserved. 7 | // 8 | 9 | import UIKit 10 | 11 | class TouchDelayRecognizer: UIGestureRecognizer { 12 | 13 | var timer : NSTimer? 14 | 15 | override init(target: AnyObject, action: Selector) { 16 | super.init(target: target, action: action) 17 | self.delaysTouchesBegan = true 18 | } 19 | 20 | func fail () { 21 | self.state = .Failed 22 | } 23 | 24 | override func reset () { 25 | timer?.invalidate() 26 | timer = nil 27 | } 28 | 29 | override func touchesBegan(touches: Set, withEvent event: UIEvent) { 30 | timer = NSTimer.scheduledTimerWithTimeInterval(0.15, target: self, selector: "fail", userInfo: nil, repeats: false) 31 | } 32 | 33 | override func touchesEnded(touches: Set, withEvent event: UIEvent) { 34 | self.fail() 35 | } 36 | 37 | override func touchesCancelled(touches: Set!, withEvent event: UIEvent!) { 38 | self.fail() 39 | } 40 | } 41 | -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay/Info.plist: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | CFBundleDevelopmentRegion 6 | en 7 | CFBundleExecutable 8 | $(EXECUTABLE_NAME) 9 | CFBundleIdentifier 10 | teodorpatras.$(PRODUCT_NAME:rfc1034identifier) 11 | CFBundleInfoDictionaryVersion 12 | 6.0 13 | CFBundleName 14 | $(PRODUCT_NAME) 15 | CFBundlePackageType 16 | APPL 17 | CFBundleShortVersionString 18 | 1.0 19 | CFBundleSignature 20 | ???? 21 | CFBundleVersion 22 | 1 23 | LSRequiresIPhoneOS 24 | 25 | UILaunchStoryboardName 26 | LaunchScreen 27 | UIMainStoryboardFile 28 | Main 29 | UIRequiredDeviceCapabilities 30 | 31 | armv7 32 | 33 | UISupportedInterfaceOrientations 34 | 35 | UIInterfaceOrientationPortrait 36 | 37 | UISupportedInterfaceOrientations~ipad 38 | 39 | UIInterfaceOrientationPortrait 40 | UIInterfaceOrientationPortraitUpsideDown 41 | UIInterfaceOrientationLandscapeLeft 42 | UIInterfaceOrientationLandscapeRight 43 | 44 | 45 | 46 | -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay/AppDelegate.swift: -------------------------------------------------------------------------------- 1 | // 2 | // AppDelegate.swift 3 | // ScrollViewPlay 4 | // 5 | // Created by Teodor Patras on 02/07/15. 6 | // Copyright (c) 2015 Teodor Patras. All rights reserved. 7 | // 8 | 9 | import UIKit 10 | 11 | @UIApplicationMain 12 | class AppDelegate: UIResponder, UIApplicationDelegate { 13 | 14 | var window: UIWindow? 15 | 16 | 17 | func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool { 18 | // Override point for customization after application launch. 19 | return true 20 | } 21 | 22 | func applicationWillResignActive(application: UIApplication) { 23 | // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state. 24 | // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game. 25 | } 26 | 27 | func applicationDidEnterBackground(application: UIApplication) { 28 | // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later. 29 | // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits. 30 | } 31 | 32 | func applicationWillEnterForeground(application: UIApplication) { 33 | // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background. 34 | } 35 | 36 | func applicationDidBecomeActive(application: UIApplication) { 37 | // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface. 38 | } 39 | 40 | func applicationWillTerminate(application: UIApplication) { 41 | // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:. 42 | } 43 | 44 | 45 | } 46 | 47 | -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay/TableViewController.swift: -------------------------------------------------------------------------------- 1 | // 2 | // TableViewController.swift 3 | // ScrollViewPlay 4 | // 5 | // Created by Teodor Patras on 02/07/15. 6 | // Copyright (c) 2015 Teodor Patras. All rights reserved. 7 | // 8 | 9 | import UIKit 10 | 11 | func statusAndNavigationBarHeights(controller : UINavigationController) -> CGFloat{ 12 | return UIApplication.sharedApplication().statusBarFrame.height + controller.navigationBar.frame.size.height 13 | } 14 | 15 | class TableViewController: UITableViewController { 16 | 17 | let dataSource = [["title" : "Infinite scrolling", "segue" : "showInfiniteScrollView"],["title" : "Header View & Zooming", "segue" : "showHeaderZoomScrollView"], ["title" : "Nested scroll views", "segue" : "showNestedScrollViews"], ["title" : "Scroll view touch handling", "segue" : "showScrollTouchController"]] 18 | 19 | override func viewDidLoad() { 20 | super.viewDidLoad() 21 | 22 | self.navigationItem.title = "Overview" 23 | self.navigationController?.navigationBar.translucent = false 24 | 25 | // Uncomment the following line to preserve selection between presentations 26 | // self.clearsSelectionOnViewWillAppear = false 27 | 28 | // Uncomment the following line to display an Edit button in the navigation bar for this view controller. 29 | // self.navigationItem.rightBarButtonItem = self.editButtonItem() 30 | } 31 | 32 | override func didReceiveMemoryWarning() { 33 | super.didReceiveMemoryWarning() 34 | // Dispose of any resources that can be recreated. 35 | } 36 | 37 | // MARK: - Table view data source 38 | 39 | override func numberOfSectionsInTableView(tableView: UITableView) -> Int { 40 | // #warning Potentially incomplete method implementation. 41 | // Return the number of sections. 42 | return 1 43 | } 44 | 45 | override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 46 | // #warning Incomplete method implementation. 47 | // Return the number of rows in the section. 48 | return dataSource.count 49 | } 50 | 51 | override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { 52 | let cell = tableView.dequeueReusableCellWithIdentifier("myCell", forIndexPath: indexPath) as! UITableViewCell 53 | 54 | cell.textLabel?.text = dataSource[indexPath.row]["title"] 55 | 56 | return cell 57 | } 58 | 59 | override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) { 60 | tableView.deselectRowAtIndexPath(indexPath, animated: true) 61 | self.performSegueWithIdentifier(dataSource[indexPath.row]["segue"], sender: nil) 62 | } 63 | } 64 | -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay/DynamicCollectionLayout.swift: -------------------------------------------------------------------------------- 1 | // 2 | // DynamicCollectionLayout.swift 3 | // ScrollViewPlay 4 | // 5 | // Created by Teodor Patras on 05/07/15. 6 | // Copyright (c) 2015 Teodor Patras. All rights reserved. 7 | // 8 | 9 | import UIKit 10 | 11 | class DynamicCollectionLayout: UICollectionViewFlowLayout { 12 | 13 | var animator : UIDynamicAnimator! 14 | 15 | override func prepareLayout() { 16 | super.prepareLayout() 17 | 18 | if animator == nil { 19 | animator = UIDynamicAnimator(collectionViewLayout: self) 20 | /* 21 | This needs to be optimised in a real life application 22 | use UIDynamicAnimator's 23 | 24 | func addBehavior(behavior: UIDynamicBehavior!) 25 | func removeBehavior(behavior: UIDynamicBehavior!) 26 | 27 | To add only the visible items at a given time and remove the other ones 28 | which are not visible anymore 29 | 30 | */ 31 | let contentSize = self.collectionViewContentSize() 32 | let items = super.layoutAttributesForElementsInRect(CGRectMake(0, 0, contentSize.width, contentSize.height)) as! [UICollectionViewLayoutAttributes] 33 | 34 | for item in items { 35 | let spring = UIAttachmentBehavior(item: item, attachedToAnchor: item.center) 36 | 37 | spring.length = 0 38 | spring.damping = 0.5 39 | spring.frequency = 0.8 40 | 41 | animator.addBehavior(spring) 42 | } 43 | } 44 | } 45 | 46 | override func layoutAttributesForItemAtIndexPath(indexPath: NSIndexPath) -> UICollectionViewLayoutAttributes! { 47 | return animator.layoutAttributesForCellAtIndexPath(indexPath) 48 | } 49 | 50 | override func layoutAttributesForElementsInRect(rect: CGRect) -> [AnyObject]? { 51 | return animator.itemsInRect(rect) 52 | } 53 | 54 | override func shouldInvalidateLayoutForBoundsChange(newBounds: CGRect) -> Bool { 55 | let scrollDelta = newBounds.origin.y - self.collectionView!.bounds.origin.y 56 | let touchLocation = self.collectionView!.panGestureRecognizer.locationInView(self.collectionView!) 57 | 58 | for spring in animator.behaviors { 59 | let item = (spring as! UIAttachmentBehavior).items.first as! UICollectionViewLayoutAttributes 60 | 61 | let anchorPoint = (spring as! UIAttachmentBehavior).anchorPoint 62 | let distanceFromTouch = fabs(touchLocation.y - anchorPoint.y) 63 | let scrollResistance = distanceFromTouch / 750 64 | 65 | var center = item.center 66 | center.y += scrollDelta * scrollResistance 67 | item.center = center 68 | 69 | animator.updateItemUsingCurrentState(item) 70 | } 71 | 72 | return false 73 | } 74 | 75 | } 76 | -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay/DotView.swift: -------------------------------------------------------------------------------- 1 | // 2 | // DotView.swift 3 | // ScrollViewPlay 4 | // 5 | // Created by Teodor Patras on 05/07/15. 6 | // Copyright (c) 2015 Teodor Patras. All rights reserved. 7 | // 8 | 9 | import UIKit 10 | 11 | class DotView: UIView { 12 | 13 | var color = UIColor.whiteColor() 14 | var highlightColor = UIColor.blackColor() 15 | 16 | class func placeRandomViewsWithinSuperview(superview : UIView, numberOfViews : Int, target : UIGestureRecognizerDelegate?, selector: Selector?) 17 | { 18 | for i in 1...numberOfViews { 19 | let randomDim = CGFloat(max(10, arc4random() % 100)) 20 | let bounds = superview.bounds 21 | let randomYCenter = max (randomDim / 2 + 10, CGFloat(arc4random()) % (bounds.size.height - randomDim / 2)) 22 | let randomXCenter = max (randomDim / 2 + 10, CGFloat(arc4random()) % (bounds.size.width - randomDim / 2)) 23 | 24 | let view = DotView(frame: CGRectMake(0, 0, randomDim, randomDim)) 25 | view.center = CGPointMake(randomXCenter, randomYCenter) 26 | superview.addSubview(view) 27 | 28 | view.backgroundColor = randomColor() 29 | view.color = view.backgroundColor! 30 | view.highlightColor = view.darkerColor() 31 | 32 | view.layer.cornerRadius = randomDim / 2 33 | 34 | if let t = target, let s = selector { 35 | let gesture = UILongPressGestureRecognizer(target: t, action: s) 36 | view.addGestureRecognizer(gesture) 37 | gesture.cancelsTouchesInView = false 38 | gesture.delegate = target 39 | } 40 | } 41 | } 42 | 43 | func darkerColor() -> UIColor{ 44 | 45 | var r:CGFloat = 0 46 | var g:CGFloat = 0 47 | var b:CGFloat = 0 48 | var a:CGFloat = 0 49 | color.getRed(&r, green: &g, blue: &b, alpha: &a) 50 | 51 | let darkeningFactor : CGFloat = 0.3 52 | 53 | return UIColor(red: max (r - darkeningFactor, 0.0), green: max (0.0, g - darkeningFactor), blue: max(b - darkeningFactor, 0.0), alpha: a) 54 | } 55 | 56 | override func touchesBegan(touches: Set, withEvent event: UIEvent) { 57 | self.backgroundColor = self.highlightColor 58 | } 59 | 60 | override func touchesEnded(touches: Set, withEvent event: UIEvent) { 61 | self.backgroundColor = color 62 | } 63 | 64 | override func touchesCancelled(touches: Set!, withEvent event: UIEvent!) { 65 | self.backgroundColor = color 66 | } 67 | 68 | override func pointInside(point: CGPoint, withEvent event: UIEvent?) -> Bool { 69 | var touchBounds = self.bounds 70 | if CGRectGetWidth(touchBounds) < 44 { 71 | let expansion = 44 - CGRectGetWidth(touchBounds) 72 | touchBounds = CGRectInset(touchBounds, -expansion, -expansion) 73 | } 74 | 75 | return CGRectContainsPoint(touchBounds, point) 76 | } 77 | } 78 | -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay/HeaderZoomScrollView.swift: -------------------------------------------------------------------------------- 1 | // 2 | // HeaderZoomScrollView.swift 3 | // ScrollViewPlay 4 | // 5 | // Created by Teodor Patras on 02/07/15. 6 | // Copyright (c) 2015 Teodor Patras. All rights reserved. 7 | // 8 | 9 | import UIKit 10 | 11 | class HeaderZoomScrollView: UIScrollView, UIScrollViewDelegate { 12 | 13 | 14 | // MARK:- Subviews - 15 | 16 | let rocketsView : UIImageView 17 | let starsView : UIImageView 18 | 19 | // MARK:- Constants - 20 | 21 | let topMargin : CGFloat = 0 22 | let rocketsTopMargin : CGFloat = 10 23 | let rocketsRightMargin : CGFloat = 20 24 | 25 | // MARK:- Helper variables - 26 | 27 | var referenceZoomScale : CGFloat = 0 28 | 29 | // MARK:- Initializer - 30 | 31 | required init(coder aDecoder: NSCoder) { 32 | 33 | rocketsView = UIImageView(image: UIImage(named: "rockets")) 34 | starsView = UIImageView (image: UIImage(named: "stars")) 35 | 36 | super.init(coder: aDecoder) 37 | 38 | self.contentSize = starsView.frame.size 39 | 40 | 41 | let screenBounds = UIScreen.mainScreen().bounds 42 | 43 | starsView.frame = CGRectMake(0, topMargin, CGRectGetWidth(starsView.frame), CGRectGetHeight(starsView.frame)) 44 | 45 | rocketsView.frame = CGRectMake(CGRectGetWidth(screenBounds) - rocketsRightMargin - CGRectGetWidth(rocketsView.frame), rocketsTopMargin, CGRectGetWidth(rocketsView.frame), CGRectGetHeight(rocketsView.frame)) 46 | 47 | self.addSubview(starsView) 48 | self.addSubview(rocketsView) 49 | 50 | self.delegate = self 51 | self.minimumZoomScale = 1.0 52 | self.maximumZoomScale = 8 53 | } 54 | 55 | // MARK:- Layout - 56 | 57 | override func setZoomScale(scale: CGFloat, animated: Bool) { 58 | super.setZoomScale(scale, animated: animated) 59 | referenceZoomScale = self.zoomScale 60 | } 61 | 62 | override func layoutSubviews() { 63 | super.layoutSubviews() 64 | 65 | let visibleBounds = self.convertRect(self.bounds, toView: self.starsView) 66 | 67 | /* 68 | let maxVisibleX = CGRectGetMaxX(visibleBounds) 69 | let minVisibleX = CGRectGetMinX(visibleBounds) 70 | */ 71 | 72 | let moonCenterX = CGRectGetMaxX(self.bounds) - rocketsRightMargin - CGRectGetWidth(rocketsView.frame) / 2 73 | let moonCenterY = self.contentOffset.y + 10 + CGRectGetHeight(rocketsView.frame) / 2 74 | 75 | rocketsView.center = CGPointMake(moonCenterX, CGRectGetHeight(rocketsView.frame) / 2 + rocketsTopMargin) 76 | } 77 | 78 | // MARK:- UIScrollviewDelegate - 79 | 80 | 81 | func viewForZoomingInScrollView(scrollView: UIScrollView) -> UIView? { 82 | return starsView 83 | } 84 | 85 | func scrollViewDidEndZooming(scrollView: UIScrollView, withView view: UIView!, atScale scale: CGFloat) { 86 | // redraw after zooming 87 | 88 | let s = scale * scrollView.window!.screen.scale 89 | starsView.contentScaleFactor = scale 90 | } 91 | } 92 | -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay/NestedScrollViewController.swift: -------------------------------------------------------------------------------- 1 | // 2 | // NestedScrollViewController.swift 3 | // ScrollViewPlay 4 | // 5 | // Created by Teodor Patras on 05/07/15. 6 | // Copyright (c) 2015 Teodor Patras. All rights reserved. 7 | // 8 | 9 | import UIKit 10 | 11 | class NestedScrollViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout, ScrollableCellDelegate { 12 | 13 | @IBOutlet weak var scrollView: UIScrollView! 14 | @IBOutlet weak var collectionView: UICollectionView! 15 | 16 | var secondPageView : UIView! 17 | 18 | override func viewDidLoad() { 19 | super.viewDidLoad() 20 | 21 | self.navigationItem.title = "Nested scroll views" 22 | 23 | var frame = UIScreen.mainScreen().bounds 24 | frame.origin.x += frame.size.width 25 | 26 | secondPageView = UIView(frame: frame) 27 | 28 | secondPageView.backgroundColor = UIColor.redColor() 29 | scrollView.addSubview(secondPageView) 30 | 31 | self.collectionView.backgroundColor = UIColor.clearColor() 32 | self.collectionView.collectionViewLayout = DynamicCollectionLayout() 33 | } 34 | 35 | override func viewDidAppear(animated: Bool) { 36 | super.viewDidAppear(animated) 37 | 38 | self.scrollView.contentSize = CGSizeMake(scrollView.frame.size.width * 2, scrollView.frame.size.height) 39 | } 40 | 41 | // MARK:- UICollectionView DataSource & Delegate - 42 | 43 | func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int 44 | { 45 | return 100 46 | } 47 | 48 | func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell { 49 | let cell = collectionView.dequeueReusableCellWithReuseIdentifier("scrollCell", forIndexPath: indexPath) as! ScrollableCell 50 | 51 | cell.dragView.backgroundColor = randomColor() 52 | cell.delegate = self 53 | 54 | return cell 55 | } 56 | 57 | func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize { 58 | return CGSizeMake(collectionView.bounds.size.width, 60) 59 | } 60 | 61 | func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAtIndex section: Int) -> CGFloat { 62 | return 10 63 | } 64 | 65 | // MARK:- ScrollableCellDelegate - 66 | 67 | func scrollableCellDidBeginPulling(cell: ScrollableCell) { 68 | self.scrollView.scrollEnabled = false 69 | 70 | self.secondPageView.backgroundColor = cell.dragView.backgroundColor 71 | } 72 | 73 | func scrollableCellDidChangePullOffset(cell: ScrollableCell, offset: CGFloat) { 74 | self.scrollView.contentOffset = CGPointMake(offset, 0) 75 | } 76 | 77 | func scrollableCellDidEndPulling(cell: ScrollableCell) { 78 | self.scrollView.scrollEnabled = true 79 | } 80 | } 81 | 82 | func randomColor() -> UIColor{ 83 | 84 | var randomRed:CGFloat = CGFloat(drand48()) 85 | 86 | var randomGreen:CGFloat = CGFloat(drand48()) 87 | 88 | var randomBlue:CGFloat = CGFloat(drand48()) 89 | 90 | return UIColor(red: randomRed, green: randomGreen, blue: randomBlue, alpha: 1.0) 91 | 92 | } 93 | -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay/Base.lproj/LaunchScreen.xib: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 20 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay/ScrollableCell.swift: -------------------------------------------------------------------------------- 1 | 2 | // 3 | // ScrollableCell.swift 4 | // ScrollViewPlay 5 | // 6 | // Created by Teodor Patras on 05/07/15. 7 | // Copyright (c) 2015 Teodor Patras. All rights reserved. 8 | // 9 | 10 | import UIKit 11 | 12 | class ScrollableCell: UICollectionViewCell, UIScrollViewDelegate { 13 | 14 | 15 | var scrollView: UIScrollView! 16 | var dragView: UIView! 17 | var label : UILabel! 18 | 19 | weak var delegate : ScrollableCellDelegate? 20 | 21 | var pulling = false 22 | var deceleratingBackToZero = false 23 | 24 | var decelerationDistanceRatio : CGFloat = 0 25 | let pullThreshold : CGFloat = 100 26 | 27 | override func awakeFromNib() { 28 | 29 | scrollView = UIScrollView() 30 | dragView = UIView() 31 | label = UILabel() 32 | 33 | label.font = UIFont(name: "HelveticaNeue-Light", size: 20) 34 | label.backgroundColor = UIColor.clearColor() 35 | label.text = "Slide from right to left" 36 | label.textAlignment = NSTextAlignment.Center 37 | 38 | self.scrollView.delegate = self 39 | self.scrollView.pagingEnabled = true 40 | self.scrollView.showsHorizontalScrollIndicator = false 41 | 42 | self.addSubview(self.scrollView) 43 | self.dragView.addSubview(label) 44 | self.scrollView.addSubview(dragView) 45 | } 46 | 47 | override func layoutSubviews() { 48 | 49 | let contentView = self.contentView 50 | let bounds = self.bounds 51 | let pageWidth = bounds.size.width + pullThreshold 52 | 53 | self.scrollView.frame = CGRectMake(0, 0, pageWidth, bounds.size.height) 54 | self.scrollView.contentSize = CGSizeMake(pageWidth * 2, bounds.size.height) 55 | 56 | dragView.frame = bounds 57 | label.frame = bounds 58 | } 59 | 60 | // MARK:- UIScrollViewDelegate - 61 | 62 | func scrollViewDidScroll(scrollView: UIScrollView) { 63 | let offset = scrollView.contentOffset.x 64 | 65 | if offset > pullThreshold && !pulling { 66 | // did start pulling 67 | self.delegate?.scrollableCellDidBeginPulling(self) 68 | pulling = true 69 | } 70 | 71 | if pulling { 72 | var pullOffset = CGFloat(0) 73 | 74 | if deceleratingBackToZero{ 75 | pullOffset = offset * decelerationDistanceRatio 76 | } else { 77 | pullOffset = max(0, offset - pullThreshold) 78 | } 79 | 80 | self.delegate?.scrollableCellDidChangePullOffset(self, offset: pullOffset) 81 | self.dragView.transform = CGAffineTransformMakeTranslation(pullOffset, 0) 82 | } 83 | } 84 | 85 | func scrollViewDidEndDecelerating(scrollView: UIScrollView) { 86 | self.scrollingEnded() 87 | } 88 | 89 | func scrollViewDidEndDragging(scrollView: UIScrollView, willDecelerate decelerate: Bool) { 90 | if !decelerate { 91 | self.scrollingEnded() 92 | } 93 | } 94 | 95 | func scrollViewWillEndDragging(scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer) { 96 | 97 | let offset = scrollView.contentOffset.x 98 | 99 | if targetContentOffset.memory.x == 0 && offset > 0 { 100 | deceleratingBackToZero = true 101 | let pullOffset = max(0, offset - pullThreshold) 102 | decelerationDistanceRatio = pullOffset / offset 103 | } 104 | } 105 | 106 | func scrollingEnded () 107 | { 108 | deceleratingBackToZero = false 109 | pulling = false 110 | self.delegate?.scrollableCellDidEndPulling(self) 111 | self.scrollView.contentOffset = CGPointZero 112 | self.dragView.transform = CGAffineTransformIdentity 113 | } 114 | } 115 | 116 | @objc protocol ScrollableCellDelegate { 117 | func scrollableCellDidBeginPulling(cell : ScrollableCell) 118 | func scrollableCellDidChangePullOffset(cell : ScrollableCell, offset : CGFloat) 119 | func scrollableCellDidEndPulling(cell : ScrollableCell) 120 | } 121 | -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay/ScrollTouchViewController.swift: -------------------------------------------------------------------------------- 1 | // 2 | // ScrollTouchViewController.swift 3 | // ScrollViewPlay 4 | // 5 | // Created by Teodor Patras on 05/07/15. 6 | // Copyright (c) 2015 Teodor Patras. All rights reserved. 7 | // 8 | 9 | import UIKit 10 | 11 | class ScrollTouchViewController: UIViewController, UIGestureRecognizerDelegate { 12 | 13 | var dotViewsPlaced = false 14 | var canvasView : UIView! 15 | var scrollView : OverlayScrollView! 16 | var drawerView : UIVisualEffectView! 17 | 18 | override func viewDidLoad() { 19 | super.viewDidLoad() 20 | 21 | canvasView = UIView() 22 | scrollView = OverlayScrollView() 23 | drawerView = UIVisualEffectView(effect: UIBlurEffect(style: UIBlurEffectStyle.Dark)) 24 | 25 | scrollView.addSubview(drawerView) 26 | self.view.addSubview(canvasView) 27 | self.view.addSubview(scrollView) 28 | 29 | self.scrollView.showsVerticalScrollIndicator = false 30 | 31 | self.view.addGestureRecognizer(scrollView.panGestureRecognizer) 32 | 33 | self.canvasView.addGestureRecognizer(TouchDelayRecognizer(target: self, action: "")) 34 | 35 | self.navigationItem.title = "Touch events handling" 36 | 37 | } 38 | 39 | override func viewDidLayoutSubviews() { 40 | 41 | canvasView.frame = self.view.bounds 42 | scrollView.frame = self.view.bounds 43 | 44 | if !dotViewsPlaced { 45 | 46 | drawerView.frame = CGRectMake(0, 0, self.view.bounds.size.width, 350) 47 | 48 | 49 | scrollView.contentSize = CGSizeMake(self.view.bounds.size.width, self.view.bounds.size.height + drawerView.bounds.size.height) 50 | 51 | scrollView.contentOffset = CGPointMake(0, drawerView.bounds.size.height) 52 | 53 | dotViewsPlaced = true 54 | 55 | DotView.placeRandomViewsWithinSuperview(self.canvasView, numberOfViews: 15, target: self, selector: "handleLongPress:") 56 | DotView.placeRandomViewsWithinSuperview(self.drawerView.contentView, numberOfViews: 5, target: self, selector: "handleLongPress:") 57 | } 58 | } 59 | 60 | func handleLongPress(gesture : UILongPressGestureRecognizer){ 61 | let dot = gesture.view as! DotView 62 | 63 | switch gesture.state { 64 | case .Began : 65 | grabDot(dot, gestureRecognizer: gesture) 66 | case .Changed : 67 | moveDot(dot, gestureRecognizer: gesture) 68 | case .Cancelled, .Ended : 69 | dropDot(dot, gestureRecognizer: gesture) 70 | default : 71 | break 72 | } 73 | } 74 | 75 | func grabDot(dot : DotView, gestureRecognizer : UILongPressGestureRecognizer){ 76 | 77 | dot.center = self.view.convertPoint(dot.center, fromView: dot.superview) 78 | self.view.addSubview(dot) 79 | 80 | UIView.animateWithDuration(0.3, animations: { () -> Void in 81 | dot.transform = CGAffineTransformMakeScale(1.2, 1.2) 82 | dot.alpha = 0.8 83 | self.moveDot(dot, gestureRecognizer: gestureRecognizer) 84 | }) 85 | 86 | // get the touch away from the pan gesture 87 | 88 | self.scrollView.panGestureRecognizer.enabled = false 89 | self.scrollView.panGestureRecognizer.enabled = true 90 | } 91 | 92 | func moveDot(dot : DotView, gestureRecognizer : UILongPressGestureRecognizer){ 93 | dot.center = gestureRecognizer.locationInView(self.view) 94 | } 95 | 96 | func dropDot(dot : DotView, gestureRecognizer : UILongPressGestureRecognizer){ 97 | UIView.animateWithDuration(0.3, animations: { () -> Void in 98 | dot.transform = CGAffineTransformIdentity 99 | dot.alpha = 1 100 | }) 101 | 102 | let location = gestureRecognizer.locationInView(drawerView) 103 | 104 | if CGRectContainsPoint(drawerView.bounds, location) { 105 | drawerView.contentView.addSubview(dot) 106 | } else { 107 | canvasView.addSubview(dot) 108 | } 109 | 110 | dot.center = self.view.convertPoint(dot.center, toView: dot.superview) 111 | } 112 | 113 | func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer otherGestureRecognizer: UIGestureRecognizer) -> Bool { 114 | return otherGestureRecognizer == self.scrollView.panGestureRecognizer 115 | } 116 | } 117 | -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay/InfiniteScrollView.swift: -------------------------------------------------------------------------------- 1 | // 2 | // InfiniteScrollView.swift 3 | // ScrollViewPlay 4 | // 5 | // Created by Teodor Patras on 02/07/15. 6 | // Copyright (c) 2015 Teodor Patras. All rights reserved. 7 | // 8 | 9 | import UIKit 10 | 11 | class InfiniteScrollView: UIScrollView { 12 | 13 | let containerView : UIView 14 | let imageNames = ["rocket1", "rocket4", "rocket2", "rocket3"] 15 | var imageViews = [UIImageView]() 16 | var visibleImageViews = [UIImageView]() 17 | 18 | required init(coder aDecoder: NSCoder) { 19 | 20 | containerView = UIView() 21 | 22 | super.init(coder: aDecoder) 23 | 24 | self.contentSize = CGSizeMake(5000, UIScreen.mainScreen().bounds.height - 128) 25 | containerView.frame = CGRectMake(0, 0, self.contentSize.width, self.contentSize.height * 0.7) 26 | self.addSubview(self.containerView) 27 | 28 | var actualSize : CGFloat = 0 29 | var imageView : UIImageView 30 | 31 | for name in imageNames 32 | { 33 | imageView = UIImageView(image: UIImage(named: name)) 34 | actualSize += CGRectGetWidth(imageView.frame) 35 | imageViews.append(imageView) 36 | } 37 | 38 | /* this should only work if all the images place side by side would 39 | not fit within the width of the scroll view */ 40 | 41 | if actualSize <= CGRectGetWidth(self.bounds) { 42 | self.scrollEnabled = false 43 | self.bounces = false 44 | } 45 | 46 | } 47 | 48 | // MARK:- Layout - 49 | 50 | func recenterIfNecessary () 51 | { 52 | let centerOffsetX = (self.contentSize.width - self.bounds.size.width) / 2 53 | let distanceFromCenter = fabs(self.contentOffset.x - centerOffsetX) 54 | 55 | if distanceFromCenter > self.contentSize.width / 4 { 56 | 57 | 58 | // move all the views by the same amount so they appear still 59 | 60 | for imageView in self.visibleImageViews 61 | { 62 | var center = self.containerView.convertPoint(imageView.center, toView: self) 63 | center.x += centerOffsetX - self.contentOffset.x 64 | 65 | imageView.center = self.convertPoint(center, toView: self.containerView) 66 | } 67 | 68 | self.contentOffset = CGPointMake(centerOffsetX, self.contentOffset.y) 69 | } 70 | } 71 | 72 | override func layoutSubviews() { 73 | super.layoutSubviews() 74 | 75 | self.recenterIfNecessary() 76 | 77 | // tile content in visible bounds 78 | 79 | let visibleBounds = self.convertRect(self.bounds, toView: self.containerView) 80 | let minVisX = CGRectGetMinX(visibleBounds) 81 | let maxVisX = CGRectGetMaxX(visibleBounds) 82 | 83 | self.tileFromMinX(minVisX, toMaxX: maxVisX) 84 | } 85 | 86 | // MARK:- UIImageViews Tiling - 87 | 88 | 89 | func placeImageViewOnRight(imageView : UIImageView, rightEdge : CGFloat) -> CGFloat { 90 | 91 | var frame = imageView.frame 92 | frame.origin.x = rightEdge 93 | frame.origin.y = CGRectGetHeight(self.containerView.bounds) - frame.size.height 94 | imageView.frame = frame 95 | 96 | self.containerView.addSubview(imageView) 97 | self.visibleImageViews.append(imageView) 98 | 99 | return CGRectGetMaxX(frame) 100 | } 101 | 102 | func placeImageViewOnLeft(imageView : UIImageView, leftEdge : CGFloat) -> CGFloat { 103 | 104 | var frame = imageView.frame 105 | frame.origin.x = leftEdge - CGRectGetWidth(frame) 106 | frame.origin.y = CGRectGetHeight(self.containerView.bounds) - frame.size.height 107 | imageView.frame = frame 108 | 109 | self.containerView.addSubview(imageView) 110 | self.visibleImageViews.insert(imageView, atIndex: 0) 111 | 112 | return CGRectGetMinX(frame) 113 | } 114 | 115 | func tileFromMinX(minVisX : CGFloat, toMaxX maxX: CGFloat) { 116 | 117 | 118 | // place the first image 119 | 120 | if visibleImageViews.count == 0 { 121 | var imageView = imageViews.removeAtIndex(0) 122 | self.placeImageViewOnRight(imageView, rightEdge: minVisX) 123 | } 124 | 125 | 126 | // place missing images on the right edge 127 | 128 | var shouldPlaceSomeMore = true 129 | var newXOrigin = CGRectGetMaxX(self.visibleImageViews.last!.frame) 130 | 131 | while shouldPlaceSomeMore 132 | { 133 | shouldPlaceSomeMore = false 134 | if newXOrigin < maxX 135 | { 136 | if let iv = imageViews.last 137 | { 138 | newXOrigin = self.placeImageViewOnRight(iv, rightEdge: newXOrigin) 139 | imageViews.removeLast() 140 | shouldPlaceSomeMore = newXOrigin < maxX 141 | } 142 | } 143 | } 144 | 145 | 146 | // place missing images on the left edge 147 | 148 | shouldPlaceSomeMore = true 149 | newXOrigin = CGRectGetMinX(self.visibleImageViews.first!.frame) 150 | 151 | while shouldPlaceSomeMore 152 | { 153 | shouldPlaceSomeMore = false 154 | if newXOrigin > minVisX { 155 | if let iv = imageViews.first 156 | { 157 | newXOrigin = self.placeImageViewOnLeft(iv, leftEdge: newXOrigin) 158 | imageViews.removeAtIndex(0) 159 | shouldPlaceSomeMore = newXOrigin > minVisX 160 | } 161 | } 162 | } 163 | 164 | // remove images that have fallen over the right edge 165 | 166 | var shouldRemove = true 167 | 168 | while shouldRemove 169 | { 170 | shouldRemove = false 171 | if let iv = visibleImageViews.last 172 | { 173 | if CGRectGetMinX(iv.frame) > maxX { 174 | imageViews.append(iv) 175 | iv.removeFromSuperview() 176 | shouldRemove = true 177 | visibleImageViews.removeLast() 178 | } 179 | } 180 | } 181 | 182 | // remove images that have fallen over the left edge 183 | 184 | shouldRemove = true 185 | 186 | while shouldRemove 187 | { 188 | shouldRemove = false 189 | 190 | if let iv = visibleImageViews.first 191 | { 192 | if CGRectGetMaxX(iv.frame) < minVisX 193 | { 194 | imageViews.insert(iv, atIndex: 0) 195 | iv.removeFromSuperview() 196 | shouldRemove = true 197 | visibleImageViews.removeAtIndex(0) 198 | } 199 | } 200 | } 201 | 202 | } 203 | 204 | } 205 | -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay/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 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 | 79 | 80 | 81 | 82 | 83 | 84 | 85 | 86 | 87 | 88 | 89 | 90 | 91 | 92 | 93 | 94 | 95 | 96 | 97 | 98 | 99 | 100 | 101 | 102 | 103 | 104 | 105 | 106 | 107 | 108 | 109 | 110 | 111 | 112 | 113 | 114 | 115 | 116 | 117 | 118 | 119 | 120 | 121 | 122 | 123 | 124 | 125 | 126 | 127 | 128 | 129 | 130 | 131 | 132 | 133 | 134 | 135 | 136 | 137 | 138 | 139 | 140 | 141 | 142 | 143 | 144 | 145 | 146 | 147 | 148 | 149 | 150 | 151 | 152 | 153 | 154 | 155 | 156 | 157 | 158 | 159 | 160 | 161 | 162 | 163 | 164 | 165 | 166 | 167 | 168 | 169 | 170 | 171 | 172 | 173 | 174 | 175 | 176 | 177 | 178 | 179 | 180 | 181 | 182 | 183 | 184 | 185 | 186 | 187 | 188 | 189 | 190 | 191 | 192 | 193 | 194 | 195 | 196 | 197 | 198 | 199 | 200 | 201 | 202 | 203 | 204 | 205 | 206 | 207 | 208 | 209 | 210 | 211 | 212 | -------------------------------------------------------------------------------- /ScrollViewPlay/ScrollViewPlay.xcodeproj/project.pbxproj: 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