├── README.md
├── ReadableTextColorByImage.xcodeproj
    ├── project.pbxproj
    ├── project.xcworkspace
    │   └── contents.xcworkspacedata
    └── xcuserdata
    │   └── ray.xcuserdatad
    │       └── xcschemes
    │           ├── ReadableTextColorByImage.xcscheme
    │           └── xcschememanagement.plist
├── ReadableTextColorByImage
    ├── AppDelegate.swift
    ├── Assets.xcassets
    │   ├── AppIcon.appiconset
    │   │   ├── Contents.json
    │   │   ├── icon-ipad_29.png
    │   │   ├── icon-ipad_29@2x.png
    │   │   ├── icon-ipad_40.png
    │   │   ├── icon-ipad_40@2x.png
    │   │   ├── icon-ipad_50.png
    │   │   ├── icon-ipad_50@2x.png
    │   │   ├── icon-ipad_72.png
    │   │   ├── icon-ipad_72@2x.png
    │   │   ├── icon-ipad_76.png
    │   │   ├── icon-ipad_76@2x.png
    │   │   ├── icon-iphone_29.png
    │   │   ├── icon-iphone_29@2x.png
    │   │   ├── icon-iphone_29@3x.png
    │   │   ├── icon-iphone_40@2x.png
    │   │   ├── icon-iphone_40@3x.png
    │   │   ├── icon-iphone_57.png
    │   │   ├── icon-iphone_57@2x.png
    │   │   ├── icon-iphone_60@2x.png
    │   │   └── icon-iphone_60@3x.png
    │   └── Contents.json
    ├── Base.lproj
    │   └── LaunchScreen.storyboard
    ├── Info.plist
    ├── Main.storyboard
    └── ViewController.swift
├── readme-icon.png
└── readme-screen.jpg


/README.md:
--------------------------------------------------------------------------------
1 | ## Readable text color by image
2 | ### Swift newbie experiment.
3 | 
4 | ![](readme-icon.png)
5 | 
6 | ![](readme-screen.jpg)
7 | 
8 | 
9 | 


--------------------------------------------------------------------------------
/ReadableTextColorByImage.xcodeproj/project.pbxproj:
--------------------------------------------------------------------------------
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/ReadableTextColorByImage/AppDelegate.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  AppDelegate.swift
 3 | //  ReadableTextColorByImage
 4 | //
 5 | //  Created by Ray on 9/23/15.
 6 | //  Copyright © 2015 RayPS. 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 | 


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/ReadableTextColorByImage/Assets.xcassets/AppIcon.appiconset/Contents.json:
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  1 | {
  2 |   "images" : [
  3 |     {
  4 |       "size" : "29x29",
  5 |       "idiom" : "iphone",
  6 |       "filename" : "icon-iphone_29.png",
  7 |       "scale" : "1x"
  8 |     },
  9 |     {
 10 |       "size" : "29x29",
 11 |       "idiom" : "iphone",
 12 |       "filename" : "icon-iphone_29@2x.png",
 13 |       "scale" : "2x"
 14 |     },
 15 |     {
 16 |       "size" : "29x29",
 17 |       "idiom" : "iphone",
 18 |       "filename" : "icon-iphone_29@3x.png",
 19 |       "scale" : "3x"
 20 |     },
 21 |     {
 22 |       "size" : "40x40",
 23 |       "idiom" : "iphone",
 24 |       "filename" : "icon-iphone_40@2x.png",
 25 |       "scale" : "2x"
 26 |     },
 27 |     {
 28 |       "size" : "40x40",
 29 |       "idiom" : "iphone",
 30 |       "filename" : "icon-iphone_40@3x.png",
 31 |       "scale" : "3x"
 32 |     },
 33 |     {
 34 |       "size" : "57x57",
 35 |       "idiom" : "iphone",
 36 |       "filename" : "icon-iphone_57.png",
 37 |       "scale" : "1x"
 38 |     },
 39 |     {
 40 |       "size" : "57x57",
 41 |       "idiom" : "iphone",
 42 |       "filename" : "icon-iphone_57@2x.png",
 43 |       "scale" : "2x"
 44 |     },
 45 |     {
 46 |       "size" : "60x60",
 47 |       "idiom" : "iphone",
 48 |       "filename" : "icon-iphone_60@2x.png",
 49 |       "scale" : "2x"
 50 |     },
 51 |     {
 52 |       "size" : "60x60",
 53 |       "idiom" : "iphone",
 54 |       "filename" : "icon-iphone_60@3x.png",
 55 |       "scale" : "3x"
 56 |     },
 57 |     {
 58 |       "size" : "29x29",
 59 |       "idiom" : "ipad",
 60 |       "filename" : "icon-ipad_29.png",
 61 |       "scale" : "1x"
 62 |     },
 63 |     {
 64 |       "size" : "29x29",
 65 |       "idiom" : "ipad",
 66 |       "filename" : "icon-ipad_29@2x.png",
 67 |       "scale" : "2x"
 68 |     },
 69 |     {
 70 |       "size" : "40x40",
 71 |       "idiom" : "ipad",
 72 |       "filename" : "icon-ipad_40.png",
 73 |       "scale" : "1x"
 74 |     },
 75 |     {
 76 |       "size" : "40x40",
 77 |       "idiom" : "ipad",
 78 |       "filename" : "icon-ipad_40@2x.png",
 79 |       "scale" : "2x"
 80 |     },
 81 |     {
 82 |       "size" : "50x50",
 83 |       "idiom" : "ipad",
 84 |       "filename" : "icon-ipad_50.png",
 85 |       "scale" : "1x"
 86 |     },
 87 |     {
 88 |       "size" : "50x50",
 89 |       "idiom" : "ipad",
 90 |       "filename" : "icon-ipad_50@2x.png",
 91 |       "scale" : "2x"
 92 |     },
 93 |     {
 94 |       "size" : "72x72",
 95 |       "idiom" : "ipad",
 96 |       "filename" : "icon-ipad_72.png",
 97 |       "scale" : "1x"
 98 |     },
 99 |     {
100 |       "size" : "72x72",
101 |       "idiom" : "ipad",
102 |       "filename" : "icon-ipad_72@2x.png",
103 |       "scale" : "2x"
104 |     },
105 |     {
106 |       "size" : "76x76",
107 |       "idiom" : "ipad",
108 |       "filename" : "icon-ipad_76.png",
109 |       "scale" : "1x"
110 |     },
111 |     {
112 |       "size" : "76x76",
113 |       "idiom" : "ipad",
114 |       "filename" : "icon-ipad_76@2x.png",
115 |       "scale" : "2x"
116 |     }
117 |   ],
118 |   "info" : {
119 |     "version" : 1,
120 |     "author" : "xcode"
121 |   }
122 | }


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1 | {
2 |   "info" : {
3 |     "version" : 1,
4 |     "author" : "xcode"
5 |   }
6 | }


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/ReadableTextColorByImage/Base.lproj/LaunchScreen.storyboard:
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 1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="8191" systemVersion="14F27" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" initialViewController="01J-lp-oVM">
 3 |     <dependencies>
 4 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="8154"/>
 5 |     </dependencies>
 6 |     <scenes>
 7 |         <!--View Controller-->
 8 |         <scene sceneID="EHf-IW-A2E">
 9 |             <objects>
10 |                 <viewController id="01J-lp-oVM" sceneMemberID="viewController">
11 |                     <layoutGuides>
12 |                         <viewControllerLayoutGuide type="top" id="Llm-lL-Icb"/>
13 |                         <viewControllerLayoutGuide type="bottom" id="xb3-aO-Qok"/>
14 |                     </layoutGuides>
15 |                     <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
16 |                         <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
17 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
18 |                         <animations/>
19 |                         <color key="backgroundColor" cocoaTouchSystemColor="darkTextColor"/>
20 |                     </view>
21 |                 </viewController>
22 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
23 |             </objects>
24 |             <point key="canvasLocation" x="53" y="375"/>
25 |         </scene>
26 |     </scenes>
27 | </document>
28 | 


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/ReadableTextColorByImage/Info.plist:
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 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>CFBundleDevelopmentRegion</key>
 6 | 	<string>en</string>
 7 | 	<key>CFBundleExecutable</key>
 8 | 	<string>$(EXECUTABLE_NAME)</string>
 9 | 	<key>CFBundleIdentifier</key>
10 | 	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
11 | 	<key>CFBundleInfoDictionaryVersion</key>
12 | 	<string>6.0</string>
13 | 	<key>CFBundleName</key>
14 | 	<string>$(PRODUCT_NAME)</string>
15 | 	<key>CFBundlePackageType</key>
16 | 	<string>APPL</string>
17 | 	<key>CFBundleShortVersionString</key>
18 | 	<string>1.0</string>
19 | 	<key>CFBundleSignature</key>
20 | 	<string>????</string>
21 | 	<key>CFBundleVersion</key>
22 | 	<string>1</string>
23 | 	<key>LSRequiresIPhoneOS</key>
24 | 	<true/>
25 | 	<key>UILaunchStoryboardName</key>
26 | 	<string>LaunchScreen</string>
27 | 	<key>UIMainStoryboardFile</key>
28 | 	<string>Main</string>
29 | 	<key>UIRequiredDeviceCapabilities</key>
30 | 	<array>
31 | 		<string>armv7</string>
32 | 	</array>
33 | 	<key>UISupportedInterfaceOrientations</key>
34 | 	<array>
35 | 		<string>UIInterfaceOrientationPortrait</string>
36 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
37 | 		<string>UIInterfaceOrientationLandscapeRight</string>
38 | 	</array>
39 | 	<key>UISupportedInterfaceOrientations~ipad</key>
40 | 	<array>
41 | 		<string>UIInterfaceOrientationPortrait</string>
42 | 		<string>UIInterfaceOrientationPortraitUpsideDown</string>
43 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
44 | 		<string>UIInterfaceOrientationLandscapeRight</string>
45 | 	</array>
46 | </dict>
47 | </plist>
48 | 


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/ReadableTextColorByImage/Main.storyboard:
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 1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="8191" systemVersion="14F27" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
 3 |     <dependencies>
 4 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="8154"/>
 5 |     </dependencies>
 6 |     <scenes>
 7 |         <!--View Controller-->
 8 |         <scene sceneID="tne-QT-ifu">
 9 |             <objects>
10 |                 <viewController id="BYZ-38-t0r" customClass="ViewController" customModule="ReadableTextColorByImage" customModuleProvider="target" sceneMemberID="viewController">
11 |                     <layoutGuides>
12 |                         <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
13 |                         <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
14 |                     </layoutGuides>
15 |                     <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
16 |                         <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
17 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
18 |                         <subviews>
19 |                             <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="tTy-Xb-pGd">
20 |                                 <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
21 |                                 <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
22 |                                 <fontDescription key="fontDescription" type="system" pointSize="50"/>
23 |                                 <color key="tintColor" red="0.0" green="0.47843137250000001" blue="1" alpha="1" colorSpace="calibratedRGB"/>
24 |                                 <state key="normal" title="Pick Image"/>
25 |                                 <connections>
26 |                                     <action selector="myButtonDidTouched:" destination="BYZ-38-t0r" eventType="touchUpInside" id="b3j-IX-PdJ"/>
27 |                                 </connections>
28 |                             </button>
29 |                         </subviews>
30 |                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
31 |                         <color key="tintColor" red="0.0" green="1" blue="1" alpha="1" colorSpace="calibratedRGB"/>
32 |                         <constraints>
33 |                             <constraint firstItem="tTy-Xb-pGd" firstAttribute="centerX" secondItem="8bC-Xf-vdC" secondAttribute="centerX" id="4cf-yJ-CiH"/>
34 |                             <constraint firstItem="tTy-Xb-pGd" firstAttribute="centerY" secondItem="8bC-Xf-vdC" secondAttribute="centerY" id="a3y-UO-cHs"/>
35 |                             <constraint firstItem="tTy-Xb-pGd" firstAttribute="width" secondItem="8bC-Xf-vdC" secondAttribute="width" id="h78-Rf-XY5"/>
36 |                             <constraint firstItem="tTy-Xb-pGd" firstAttribute="height" secondItem="8bC-Xf-vdC" secondAttribute="height" id="pz7-Tu-JN9"/>
37 |                         </constraints>
38 |                     </view>
39 |                     <connections>
40 |                         <outlet property="screenButton" destination="tTy-Xb-pGd" id="8Zh-RF-Xgr"/>
41 |                     </connections>
42 |                 </viewController>
43 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
44 |             </objects>
45 |             <point key="canvasLocation" x="319" y="454"/>
46 |         </scene>
47 |     </scenes>
48 | </document>
49 | 


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/ReadableTextColorByImage/ViewController.swift:
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  1 | //
  2 | //  ViewController.swift
  3 | //  ReadableTextColorByImage
  4 | //
  5 | //  Created by Ray on 9/23/15.
  6 | //  Copyright © 2015 RayPS. All rights reserved.
  7 | //
  8 | 
  9 | 
 10 | import UIKit
 11 | //import QuartzCore
 12 | 
 13 | class ViewController: UIViewController, UINavigationControllerDelegate, UIImagePickerControllerDelegate {
 14 |     
 15 |     var selectedImage: UIImage?
 16 |     
 17 |     override func viewDidLoad() {
 18 |         super.viewDidLoad()
 19 |         // Do any additional setup after loading the view, typically from a nib.
 20 |     }
 21 |     
 22 |     override func didReceiveMemoryWarning() {
 23 |         super.didReceiveMemoryWarning()
 24 |         // Dispose of any resources that can be recreated.
 25 |     }
 26 |     
 27 |     @IBOutlet weak var screenButton: UIButton!
 28 |     
 29 |     
 30 |     var imagePicker = UIImagePickerController()
 31 |     
 32 |     
 33 |     
 34 |     func imagePickerController(imagePicker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String: AnyObject]) {
 35 |         
 36 |         var image: UIImage!
 37 |         
 38 |         // fetch the selected image
 39 |         if imagePicker.allowsEditing {
 40 |             image = info[UIImagePickerControllerEditedImage] as! UIImage
 41 |         } else {
 42 |             image = info[UIImagePickerControllerOriginalImage] as! UIImage
 43 |         }
 44 |         
 45 |         selectedImage = image
 46 |         
 47 |         // Do something about image by yourself
 48 |         
 49 |         screenButton.setBackgroundImage(image, forState: UIControlState.Normal)
 50 |         
 51 |         // dissmiss the image picker controller window
 52 |         self.dismissViewControllerAnimated(true, completion: nil)
 53 |         
 54 |         
 55 |         
 56 |         if isLightColor(averageColor()) {
 57 |             screenButton.tintColor = UIColor.blackColor()
 58 |         } else {
 59 |             screenButton.tintColor = UIColor.whiteColor()
 60 |         }
 61 |         
 62 |     }
 63 |     
 64 |     func averageColor() -> UIColor {
 65 |         
 66 |         let rgba = UnsafeMutablePointer<CUnsignedChar>.alloc(4)
 67 |         let colorSpace: CGColorSpaceRef = CGColorSpaceCreateDeviceRGB()!
 68 |         let info = CGBitmapInfo(rawValue: CGImageAlphaInfo.PremultipliedLast.rawValue)
 69 |         let context: CGContextRef = CGBitmapContextCreate(rgba, 1, 1, 8, 4, colorSpace, info.rawValue)!
 70 |         
 71 |         if let selectedImage = selectedImage {
 72 |             CGContextDrawImage(context, CGRectMake(0, 0, 1, 1), selectedImage.CGImage)
 73 |         }
 74 |         
 75 |         
 76 |         if rgba[3] > 0 {
 77 |             
 78 |             let alpha: CGFloat = CGFloat(rgba[3]) / 255.0
 79 |             let multiplier: CGFloat = alpha / 255.0
 80 |             
 81 |             return UIColor(red: CGFloat(rgba[0]) * multiplier, green: CGFloat(rgba[1]) * multiplier, blue: CGFloat(rgba[2]) * multiplier, alpha: alpha)
 82 |             
 83 |         } else {
 84 |             
 85 |             return UIColor(red: CGFloat(rgba[0]) / 255.0, green: CGFloat(rgba[1]) / 255.0, blue: CGFloat(rgba[2]) / 255.0, alpha: CGFloat(rgba[3]) / 255.0)
 86 |         }
 87 |     }
 88 |     
 89 |     func isLightColor(color: UIColor) -> Bool{
 90 |         
 91 |         var white: CGFloat = 0.0
 92 |         color.getWhite(&white, alpha: nil)
 93 |         if white >= 0.9 { return true }
 94 |         else { return false }
 95 |     }
 96 |     
 97 |     
 98 |     
 99 |     @IBAction func myButtonDidTouched(sender: AnyObject) {
100 |         
101 |         if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.SavedPhotosAlbum){
102 |             
103 |             imagePicker.delegate = self
104 |             imagePicker.sourceType = UIImagePickerControllerSourceType.SavedPhotosAlbum;
105 |             imagePicker.allowsEditing = false
106 |             
107 |             self.presentViewController(imagePicker, animated: true, completion: nil)
108 |         }
109 |     }
110 |     
111 | }
112 | 


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https://raw.githubusercontent.com/RayPS/ReadableTextColorByImage/e2fd68e4742a274228b5c92328f60f6819fe8c01/readme-screen.jpg


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