├── example.png ├── ScratchCardImageView.xcodeproj ├── project.xcworkspace │ └── contents.xcworkspacedata └── project.pbxproj ├── ScratchCardImageView ├── AppDelegate.swift ├── UIImage+SolidColor.swift ├── ViewController.swift ├── Assets.xcassets │ └── AppIcon.appiconset │ │ └── Contents.json ├── ViewController0.swift ├── Info.plist ├── Base.lproj │ ├── LaunchScreen.storyboard │ └── Main.storyboard ├── ScratchCardImageView.swift └── ScratchCardTouchContainer.swift ├── LICENSE ├── README.md └── .gitignore /example.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/paleksandrs/ScratchCardImageView/HEAD/example.png -------------------------------------------------------------------------------- /ScratchCardImageView.xcodeproj/project.xcworkspace/contents.xcworkspacedata: -------------------------------------------------------------------------------- 1 | 2 | 4 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /ScratchCardImageView/AppDelegate.swift: -------------------------------------------------------------------------------- 1 | // 2 | // AppDelegate.swift 3 | // ScratchCardImageView 4 | // 5 | // Created by Aleksandrs Proskurins on 09/12/2016. 6 | // Copyright © 2016 Aleksandrs Proskurins. All rights reserved. 7 | // 8 | 9 | import UIKit 10 | 11 | @UIApplicationMain 12 | class AppDelegate: UIResponder, UIApplicationDelegate { 13 | 14 | var window: UIWindow? 15 | 16 | func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool { 17 | return true 18 | } 19 | } 20 | 21 | -------------------------------------------------------------------------------- /ScratchCardImageView/UIImage+SolidColor.swift: -------------------------------------------------------------------------------- 1 | // 2 | // UIImage+SolidColor.swift 3 | // ScratchCardImageView 4 | // 5 | // Created by Aleksandrs Proskurins on 09/12/2016. 6 | // Copyright © 2016 Aleksandrs Proskurins. All rights reserved. 7 | // 8 | 9 | import UIKit 10 | 11 | public extension UIImage { 12 | public convenience init?(color: UIColor, size: CGSize = CGSize(width: 1, height: 1)) { 13 | let rect = CGRect(origin: .zero, size: size) 14 | UIGraphicsBeginImageContextWithOptions(rect.size, false, 0.0) 15 | color.setFill() 16 | UIRectFill(rect) 17 | let image = UIGraphicsGetImageFromCurrentImageContext() 18 | UIGraphicsEndImageContext() 19 | 20 | guard let cgImage = image?.cgImage else { return nil } 21 | self.init(cgImage: cgImage) 22 | } 23 | } 24 | -------------------------------------------------------------------------------- /ScratchCardImageView/ViewController.swift: -------------------------------------------------------------------------------- 1 | // 2 | // ViewController.swift 3 | // ScratchCardImageView 4 | // 5 | // Created by Aleksandrs Proskurins on 09/12/2016. 6 | // Copyright © 2016 Aleksandrs Proskurins. All rights reserved. 7 | // 8 | 9 | import UIKit 10 | 11 | class ViewController: UIViewController, ScratchCardImageViewDelegate { 12 | 13 | @IBOutlet weak var scratchCard: ScratchCardImageView! 14 | 15 | override func viewDidLoad() { 16 | super.viewDidLoad() 17 | 18 | scratchCard.image = UIImage(color: UIColor.gray, size: scratchCard.frame.size) 19 | scratchCard.lineType = .square 20 | scratchCard.lineWidth = 20 21 | scratchCard.delegate = self 22 | } 23 | 24 | func scratchCardImageViewDidEraseProgress(eraseProgress: Float) { 25 | 26 | print(eraseProgress) 27 | } 28 | } 29 | 30 | -------------------------------------------------------------------------------- /ScratchCardImageView/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 | } -------------------------------------------------------------------------------- /ScratchCardImageView/ViewController0.swift: -------------------------------------------------------------------------------- 1 | // 2 | // ViewController0.swift 3 | // ScratchCardImageView 4 | // 5 | // Created by Aleksandrs Proskurins on 09/12/2016. 6 | // Copyright © 2016 Aleksandrs Proskurins. All rights reserved. 7 | // 8 | 9 | import UIKit 10 | 11 | class ViewController0: UIViewController, ScratchCardTouchContainerDelegate { 12 | 13 | @IBOutlet weak var scratchCard: UIImageView! 14 | @IBOutlet var scratchCardTouchContainer: ScratchCardTouchContainer! 15 | 16 | override func viewDidLoad() { 17 | super.viewDidLoad() 18 | 19 | scratchCard.image = UIImage(color: UIColor.gray, size: scratchCard.bounds.size) 20 | 21 | 22 | scratchCardTouchContainer.scratchCardImageView = scratchCard 23 | scratchCardTouchContainer.lineType = .square 24 | scratchCardTouchContainer.lineWidth = 20 25 | scratchCardTouchContainer.delegate = self 26 | } 27 | 28 | func scratchCardTouchContainerDidErase(eraseProgress: Float) { 29 | 30 | print(eraseProgress) 31 | } 32 | } 33 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) 2016 Aleksandrs Proskurins 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 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Scratchcard effect 2 | 3 | To achieve scratchcard effect you have to options `ScratchCardTouchContainer` or `ScratchCardImageView` 4 | ![example](example.png) 5 | 6 | ###ScratchCardTouchContainer 7 | 8 | A simple `UIView` subclass that allows tracking touch events already outside your `UIImageView` that represents your scratchcard. Just simple pass reference to your scratchcard image view. 9 | 10 | Example: 11 | 12 | ````swift 13 | scratchCardTouchContainer.scratchCardImageView = scratchCard 14 | scratchCardTouchContainer.lineType = .square 15 | scratchCardTouchContainer.lineWidth = 20 16 | ```` 17 | 18 | ### ScratchCardImageView 19 | 20 | A simple `UIImageView` subclass that allows your `UIImageView` become a scratchcard. Touch events will be tracked only inside the `UIImageView` bounds. In the storyboard or xib set custom class of your `UIImageView` that represents your scratchcard image to `ScratchCardImageView` 21 | 22 | 23 | For both classes you can set delegate to retrieve erase progress from 0 (not erased) to 1 (fully erased). 24 | 25 | ## License 26 | 27 | `ScratchCardImageView` and `ScratchCardTouchContainer` is released under an [MIT License][mitLink]. See `LICENSE` for details. 28 | 29 | [mitLink]:http://opensource.org/licenses/MIT 30 | -------------------------------------------------------------------------------- /ScratchCardImageView/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 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Xcode 2 | # 3 | # gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore 4 | 5 | ## Build generated 6 | build/ 7 | DerivedData/ 8 | 9 | ## Various settings 10 | *.pbxuser 11 | !default.pbxuser 12 | *.mode1v3 13 | !default.mode1v3 14 | *.mode2v3 15 | !default.mode2v3 16 | *.perspectivev3 17 | !default.perspectivev3 18 | xcuserdata/ 19 | 20 | ## Other 21 | *.moved-aside 22 | *.xcuserstate 23 | 24 | ## Obj-C/Swift specific 25 | *.hmap 26 | *.ipa 27 | *.dSYM.zip 28 | *.dSYM 29 | 30 | ## Playgrounds 31 | timeline.xctimeline 32 | playground.xcworkspace 33 | 34 | # Swift Package Manager 35 | # 36 | # Add this line if you want to avoid checking in source code from Swift Package Manager dependencies. 37 | # Packages/ 38 | .build/ 39 | 40 | # CocoaPods 41 | # 42 | # We recommend against adding the Pods directory to your .gitignore. However 43 | # you should judge for yourself, the pros and cons are mentioned at: 44 | # https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control 45 | # 46 | # Pods/ 47 | 48 | # Carthage 49 | # 50 | # Add this line if you want to avoid checking in source code from Carthage dependencies. 51 | # Carthage/Checkouts 52 | 53 | Carthage/Build 54 | 55 | # fastlane 56 | # 57 | # It is recommended to not store the screenshots in the git repo. Instead, use fastlane to re-generate the 58 | # screenshots whenever they are needed. 59 | # For more information about the recommended setup visit: 60 | # https://github.com/fastlane/fastlane/blob/master/fastlane/docs/Gitignore.md 61 | 62 | fastlane/report.xml 63 | fastlane/Preview.html 64 | fastlane/screenshots 65 | fastlane/test_output 66 | -------------------------------------------------------------------------------- /ScratchCardImageView/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 | -------------------------------------------------------------------------------- /ScratchCardImageView/ScratchCardImageView.swift: -------------------------------------------------------------------------------- 1 | // 2 | // ScratchCardImageView.swift 3 | // ScratchCardImageView 4 | // 5 | // Created by Aleksandrs Proskurins on 09/12/2016. 6 | // Copyright © 2016 Aleksandrs Proskurins. All rights reserved. 7 | // 8 | 9 | import UIKit 10 | 11 | protocol ScratchCardImageViewDelegate: class { 12 | 13 | func scratchCardImageViewDidEraseProgress(eraseProgress: Float) 14 | } 15 | 16 | 17 | class ScratchCardImageView: UIImageView { 18 | 19 | private var lastPoint: CGPoint? 20 | 21 | var lineType: CGLineCap = .square 22 | var lineWidth: CGFloat = 20.0 23 | weak var delegate: ScratchCardImageViewDelegate? 24 | 25 | override func awakeFromNib() { 26 | super.awakeFromNib() 27 | 28 | isUserInteractionEnabled = true 29 | } 30 | 31 | override func touchesBegan(_ touches: Set, with event: UIEvent?) { 32 | 33 | guard let touch = touches.first else { 34 | 35 | return 36 | } 37 | 38 | lastPoint = touch.location(in: self) 39 | } 40 | 41 | override func touchesMoved(_ touches: Set, with event: UIEvent?) { 42 | 43 | guard let touch = touches.first, let point = lastPoint, let img = image else { 44 | 45 | return 46 | } 47 | 48 | let currentLocation = touch.location(in: self) 49 | eraseBetween(fromPoint: point, currentPoint: currentLocation) 50 | lastPoint = currentLocation 51 | 52 | if let _ = delegate { 53 | let progress = alphaOnlyPersentage(img: img) 54 | delegate?.scratchCardImageViewDidEraseProgress(eraseProgress: progress) 55 | } 56 | } 57 | 58 | func eraseBetween(fromPoint: CGPoint, currentPoint: CGPoint) { 59 | 60 | UIGraphicsBeginImageContext(self.frame.size) 61 | 62 | image?.draw(in: self.bounds) 63 | 64 | let path = CGMutablePath() 65 | path.move(to: fromPoint) 66 | path.addLine(to: currentPoint) 67 | 68 | let context = UIGraphicsGetCurrentContext()! 69 | context.setShouldAntialias(true) 70 | context.setLineCap(lineType) 71 | context.setLineWidth(lineWidth) 72 | context.setBlendMode(.clear) 73 | context.addPath(path) 74 | context.strokePath() 75 | 76 | image = UIGraphicsGetImageFromCurrentImageContext() 77 | 78 | UIGraphicsEndImageContext() 79 | } 80 | 81 | private func alphaOnlyPersentage(img: UIImage) -> Float { 82 | 83 | let width = Int(img.size.width) 84 | let height = Int(img.size.height) 85 | 86 | let bitmapBytesPerRow = width 87 | let bitmapByteCount = bitmapBytesPerRow * height 88 | 89 | let pixelData = UnsafeMutablePointer.allocate(capacity: bitmapByteCount) 90 | 91 | let colorSpace = CGColorSpaceCreateDeviceGray() 92 | 93 | let context = CGContext(data: pixelData, 94 | width: width, 95 | height: height, 96 | bitsPerComponent: 8, 97 | bytesPerRow: bitmapBytesPerRow, 98 | space: colorSpace, 99 | bitmapInfo: CGBitmapInfo(rawValue: CGImageAlphaInfo.alphaOnly.rawValue).rawValue)! 100 | 101 | let rect = CGRect(x: 0, y: 0, width: width, height: height) 102 | context.clear(rect) 103 | context.draw(img.cgImage!, in: rect) 104 | 105 | var alphaOnlyPixels = 0 106 | 107 | for x in 0...Int(width) { 108 | for y in 0...Int(height) { 109 | 110 | if pixelData[y * width + x] == 0 { 111 | alphaOnlyPixels += 1 112 | } 113 | } 114 | } 115 | 116 | free(pixelData) 117 | 118 | return Float(alphaOnlyPixels) / Float(bitmapByteCount) 119 | } 120 | } 121 | -------------------------------------------------------------------------------- /ScratchCardImageView/ScratchCardTouchContainer.swift: -------------------------------------------------------------------------------- 1 | // 2 | // ScratchCardTouchContainer.swift 3 | // ScratchCardImageView 4 | // 5 | // Created by Aleksandrs Proskurins on 09/12/2016. 6 | // Copyright © 2016 Aleksandrs Proskurins. All rights reserved. 7 | // 8 | 9 | import UIKit 10 | 11 | 12 | protocol ScratchCardTouchContainerDelegate: class { 13 | 14 | func scratchCardTouchContainerDidErase(eraseProgress: Float) 15 | } 16 | 17 | class ScratchCardTouchContainer: UIView { 18 | 19 | private var lastPoint: CGPoint? 20 | 21 | var lineType: CGLineCap = .square 22 | var lineWidth: CGFloat = 20.0 23 | var scratchCardImageView: UIImageView? 24 | weak var delegate: ScratchCardTouchContainerDelegate? 25 | 26 | override func touchesBegan(_ touches: Set, with event: UIEvent?) { 27 | 28 | guard let touch = touches.first, let imageView = scratchCardImageView else { 29 | 30 | return 31 | } 32 | 33 | lastPoint = touch.location(in: imageView) 34 | } 35 | 36 | override func touchesMoved(_ touches: Set, with event: UIEvent?) { 37 | 38 | guard let touch = touches.first, let point = lastPoint, let imageView = scratchCardImageView else { 39 | 40 | return 41 | } 42 | 43 | let currentLocation = touch.location(in: imageView) 44 | eraseBetween(fromPoint: point, currentPoint: currentLocation, imageView: imageView) 45 | lastPoint = currentLocation 46 | 47 | if let img = imageView.image, let _ = delegate { 48 | let progress = alphaOnlyPersentage(img: img) 49 | delegate?.scratchCardTouchContainerDidErase(eraseProgress: progress) 50 | } 51 | } 52 | 53 | func eraseBetween(fromPoint: CGPoint, currentPoint: CGPoint, imageView: UIImageView) { 54 | 55 | UIGraphicsBeginImageContext(imageView.frame.size) 56 | 57 | imageView.image?.draw(in: imageView.bounds) 58 | 59 | let path = CGMutablePath() 60 | path.move(to: fromPoint) 61 | path.addLine(to: currentPoint) 62 | 63 | let context = UIGraphicsGetCurrentContext()! 64 | context.setShouldAntialias(true) 65 | context.setLineCap(lineType) 66 | context.setLineWidth(lineWidth) 67 | context.setBlendMode(.clear) 68 | context.addPath(path) 69 | context.strokePath() 70 | 71 | imageView.image = UIGraphicsGetImageFromCurrentImageContext() 72 | 73 | UIGraphicsEndImageContext() 74 | } 75 | 76 | private func alphaOnlyPersentage(img: UIImage) -> Float { 77 | 78 | let width = Int(img.size.width) 79 | let height = Int(img.size.height) 80 | 81 | let bitmapBytesPerRow = width 82 | let bitmapByteCount = bitmapBytesPerRow * height 83 | 84 | let pixelData = UnsafeMutablePointer.allocate(capacity: bitmapByteCount) 85 | 86 | let colorSpace = CGColorSpaceCreateDeviceGray() 87 | 88 | let context = CGContext(data: pixelData, 89 | width: width, 90 | height: height, 91 | bitsPerComponent: 8, 92 | bytesPerRow: bitmapBytesPerRow, 93 | space: colorSpace, 94 | bitmapInfo: CGBitmapInfo(rawValue: CGImageAlphaInfo.alphaOnly.rawValue).rawValue)! 95 | 96 | let rect = CGRect(x: 0, y: 0, width: width, height: height) 97 | context.clear(rect) 98 | context.draw(img.cgImage!, in: rect) 99 | 100 | var alphaOnlyPixels = 0 101 | 102 | for x in 0...Int(width) { 103 | for y in 0...Int(height) { 104 | 105 | if pixelData[y * width + x] == 0 { 106 | alphaOnlyPixels += 1 107 | } 108 | } 109 | } 110 | 111 | free(pixelData) 112 | 113 | return Float(alphaOnlyPixels) / Float(bitmapByteCount) 114 | } 115 | } 116 | -------------------------------------------------------------------------------- /ScratchCardImageView/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 | 97 | 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 | -------------------------------------------------------------------------------- /ScratchCardImageView.xcodeproj/project.pbxproj: -------------------------------------------------------------------------------- 1 | // !$*UTF8*$! 2 | { 3 | archiveVersion = 1; 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