├── README.md
├── TextRecognizerSwiftUI.xcodeproj
    ├── project.pbxproj
    ├── project.xcworkspace
    │   ├── contents.xcworkspacedata
    │   ├── xcshareddata
    │   │   └── IDEWorkspaceChecks.plist
    │   └── xcuserdata
    │   │   └── mmitrevs.xcuserdatad
    │   │       └── UserInterfaceState.xcuserstate
    └── xcuserdata
    │   └── mmitrevs.xcuserdatad
    │       ├── xcdebugger
    │           └── Breakpoints_v2.xcbkptlist
    │       └── xcschemes
    │           └── xcschememanagement.plist
└── TextRecognizerSwiftUI
    ├── AppDelegate.swift
    ├── Assets.xcassets
        ├── AppIcon.appiconset
        │   └── Contents.json
        └── Contents.json
    ├── Base.lproj
        └── LaunchScreen.storyboard
    ├── ContentView.swift
    ├── Info.plist
    ├── Preview Content
        └── Preview Assets.xcassets
        │   └── Contents.json
    ├── RecongizedText.swift
    ├── ScanningView.swift
    ├── SceneDelegate.swift
    └── TextRecognizer.swift


/README.md:
--------------------------------------------------------------------------------
1 | # TextRecognizerSwiftUI
2 | Sample project showing how to use Vision's new text recognition API, along with Apple's new UI framework SwiftUI.
3 | 
4 | Blog post: https://martinmitrevski.com/2019/06/16/text-recognition-on-ios-13-with-vision-swiftui-and-combine/.
5 | 


--------------------------------------------------------------------------------
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/TextRecognizerSwiftUI.xcodeproj/project.xcworkspace/contents.xcworkspacedata:
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1 | <?xml version="1.0" encoding="UTF-8"?>
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7 | </Workspace>
8 | 


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/TextRecognizerSwiftUI.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist:
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9 | 


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/TextRecognizerSwiftUI.xcodeproj/xcuserdata/mmitrevs.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist:
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2 | <Bucket
3 |    uuid = "7CAFB0E8-2554-4844-9430-9BD3BD6B8EA9"
4 |    type = "1"
5 |    version = "2.0">
6 | </Bucket>
7 | 


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/TextRecognizerSwiftUI.xcodeproj/xcuserdata/mmitrevs.xcuserdatad/xcschemes/xcschememanagement.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>SchemeUserState</key>
 6 | 	<dict>
 7 | 		<key>TextRecognizerSwiftUI.xcscheme_^#shared#^_</key>
 8 | 		<dict>
 9 | 			<key>orderHint</key>
10 | 			<integer>0</integer>
11 | 		</dict>
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13 | </dict>
14 | </plist>
15 | 


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/TextRecognizerSwiftUI/AppDelegate.swift:
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 1 | //
 2 | //  AppDelegate.swift
 3 | //  TextRecognizerSwiftUI
 4 | //
 5 | //  Created by Martin Mitrevski on 16.06.19.
 6 | //  Copyright © 2019 Mitrevski. All rights reserved.
 7 | //
 8 | 
 9 | import UIKit
10 | 
11 | @UIApplicationMain
12 | class AppDelegate: UIResponder, UIApplicationDelegate {
13 | 
14 |     func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
15 |         // Override point for customization after application launch.
16 |         return true
17 |     }
18 | 
19 |     func applicationWillTerminate(_ application: UIApplication) {
20 |         // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
21 |     }
22 | 
23 |     // MARK: UISceneSession Lifecycle
24 | 
25 |     func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
26 |         // Called when a new scene session is being created.
27 |         // Use this method to select a configuration to create the new scene with.
28 |         return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
29 |     }
30 | 
31 |     func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
32 |         // Called when the user discards a scene session.
33 |         // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
34 |         // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
35 |     }
36 | 
37 | 
38 | }
39 | 
40 | 


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/TextRecognizerSwiftUI/Assets.xcassets/AppIcon.appiconset/Contents.json:
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 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 |       "idiom" : "ipad",
45 |       "size" : "20x20",
46 |       "scale" : "1x"
47 |     },
48 |     {
49 |       "idiom" : "ipad",
50 |       "size" : "20x20",
51 |       "scale" : "2x"
52 |     },
53 |     {
54 |       "idiom" : "ipad",
55 |       "size" : "29x29",
56 |       "scale" : "1x"
57 |     },
58 |     {
59 |       "idiom" : "ipad",
60 |       "size" : "29x29",
61 |       "scale" : "2x"
62 |     },
63 |     {
64 |       "idiom" : "ipad",
65 |       "size" : "40x40",
66 |       "scale" : "1x"
67 |     },
68 |     {
69 |       "idiom" : "ipad",
70 |       "size" : "40x40",
71 |       "scale" : "2x"
72 |     },
73 |     {
74 |       "idiom" : "ipad",
75 |       "size" : "76x76",
76 |       "scale" : "1x"
77 |     },
78 |     {
79 |       "idiom" : "ipad",
80 |       "size" : "76x76",
81 |       "scale" : "2x"
82 |     },
83 |     {
84 |       "idiom" : "ipad",
85 |       "size" : "83.5x83.5",
86 |       "scale" : "2x"
87 |     },
88 |     {
89 |       "idiom" : "ios-marketing",
90 |       "size" : "1024x1024",
91 |       "scale" : "1x"
92 |     }
93 |   ],
94 |   "info" : {
95 |     "version" : 1,
96 |     "author" : "xcode"
97 |   }
98 | }


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/TextRecognizerSwiftUI/Assets.xcassets/Contents.json:
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1 | {
2 |   "info" : {
3 |     "version" : 1,
4 |     "author" : "xcode"
5 |   }
6 | }


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/TextRecognizerSwiftUI/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="13122.16" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
 3 |     <dependencies>
 4 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="13104.12"/>
 5 |         <capability name="Safe area layout guides" minToolsVersion="9.0"/>
 6 |         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
 7 |     </dependencies>
 8 |     <scenes>
 9 |         <!--View Controller-->
10 |         <scene sceneID="EHf-IW-A2E">
11 |             <objects>
12 |                 <viewController id="01J-lp-oVM" sceneMemberID="viewController">
13 |                     <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
14 |                         <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
15 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
16 |                         <color key="backgroundColor" xcode11CocoaTouchSystemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
17 |                         <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
18 |                     </view>
19 |                 </viewController>
20 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
21 |             </objects>
22 |             <point key="canvasLocation" x="53" y="375"/>
23 |         </scene>
24 |     </scenes>
25 | </document>
26 | 


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/TextRecognizerSwiftUI/ContentView.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  ContentView.swift
 3 | //  TextRecognizerSwiftUI
 4 | //
 5 | //  Created by Martin Mitrevski on 16.06.19.
 6 | //  Copyright © 2019 Mitrevski. All rights reserved.
 7 | //
 8 | 
 9 | import SwiftUI
10 | 
11 | struct ContentView : View {
12 |     
13 |     @ObservedObject var recognizedText: RecognizedText = RecognizedText()
14 |     
15 |     var body: some View {
16 |         NavigationView {
17 |             VStack {
18 |                 Text(recognizedText.value)
19 |                 .lineLimit(nil)
20 |                 Spacer()
21 |                 NavigationLink(destination: ScanningView(recognizedText: $recognizedText.value)) {
22 |                     Text("Scan document")
23 |                 }
24 |             }
25 |         }
26 |     }
27 | }
28 | 
29 | #if DEBUG
30 | struct ContentView_Previews : PreviewProvider {
31 |     static var previews: some View {
32 |         ContentView()
33 |     }
34 | }
35 | #endif
36 | 


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/TextRecognizerSwiftUI/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>NSCameraUsageDescription</key>
 6 | 	<string>Camera access is required to scan documents.</string>
 7 | 	<key>CFBundleDevelopmentRegion</key>
 8 | 	<string>$(DEVELOPMENT_LANGUAGE)</string>
 9 | 	<key>CFBundleExecutable</key>
10 | 	<string>$(EXECUTABLE_NAME)</string>
11 | 	<key>CFBundleIdentifier</key>
12 | 	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
13 | 	<key>CFBundleInfoDictionaryVersion</key>
14 | 	<string>6.0</string>
15 | 	<key>CFBundleName</key>
16 | 	<string>$(PRODUCT_NAME)</string>
17 | 	<key>CFBundlePackageType</key>
18 | 	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
19 | 	<key>CFBundleShortVersionString</key>
20 | 	<string>1.0</string>
21 | 	<key>CFBundleVersion</key>
22 | 	<string>1</string>
23 | 	<key>LSRequiresIPhoneOS</key>
24 | 	<true/>
25 | 	<key>UIApplicationSceneManifest</key>
26 | 	<dict>
27 | 		<key>UIApplicationSupportsMultipleScenes</key>
28 | 		<false/>
29 | 		<key>UISceneConfigurations</key>
30 | 		<dict>
31 | 			<key>UIWindowSceneSessionRoleApplication</key>
32 | 			<array>
33 | 				<dict>
34 | 					<key>UILaunchStoryboardName</key>
35 | 					<string>LaunchScreen</string>
36 | 					<key>UISceneConfigurationName</key>
37 | 					<string>Default Configuration</string>
38 | 					<key>UISceneDelegateClassName</key>
39 | 					<string>$(PRODUCT_MODULE_NAME).SceneDelegate</string>
40 | 				</dict>
41 | 			</array>
42 | 		</dict>
43 | 	</dict>
44 | 	<key>UILaunchStoryboardName</key>
45 | 	<string>LaunchScreen</string>
46 | 	<key>UIRequiredDeviceCapabilities</key>
47 | 	<array>
48 | 		<string>armv7</string>
49 | 	</array>
50 | 	<key>UISupportedInterfaceOrientations</key>
51 | 	<array>
52 | 		<string>UIInterfaceOrientationPortrait</string>
53 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
54 | 		<string>UIInterfaceOrientationLandscapeRight</string>
55 | 	</array>
56 | 	<key>UISupportedInterfaceOrientations~ipad</key>
57 | 	<array>
58 | 		<string>UIInterfaceOrientationPortrait</string>
59 | 		<string>UIInterfaceOrientationPortraitUpsideDown</string>
60 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
61 | 		<string>UIInterfaceOrientationLandscapeRight</string>
62 | 	</array>
63 | </dict>
64 | </plist>
65 | 


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/TextRecognizerSwiftUI/Preview Content/Preview Assets.xcassets/Contents.json:
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1 | {
2 |   "info" : {
3 |     "version" : 1,
4 |     "author" : "xcode"
5 |   }
6 | }


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/TextRecognizerSwiftUI/RecongizedText.swift:
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 1 | //  Created by Martin Mitrevski on 16.06.19.
 2 | //  Copyright © 2019 Mitrevski. All rights reserved.
 3 | //
 4 | 
 5 | import Combine
 6 | import SwiftUI
 7 | 
 8 | final class RecognizedText: ObservableObject, Identifiable {
 9 |     
10 |     let willChange = PassthroughSubject<RecognizedText, Never>()
11 |     
12 |     var value: String = "Scan document to see its contents" {
13 |         willSet {
14 |             willChange.send(self)
15 |         }
16 |     }
17 |     
18 | }
19 | 


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/TextRecognizerSwiftUI/ScanningView.swift:
--------------------------------------------------------------------------------
 1 | //  Created by Martin Mitrevski on 15.06.19.
 2 | //  Copyright © 2019 Mitrevski. All rights reserved.
 3 | //
 4 | 
 5 | import SwiftUI
 6 | import UIKit
 7 | import VisionKit
 8 | import Combine
 9 | 
10 | struct ScanningView: UIViewControllerRepresentable {
11 |     
12 |     @Binding var recognizedText: String
13 |     
14 |     typealias UIViewControllerType = VNDocumentCameraViewController
15 |     
16 |     func makeCoordinator() -> Coordinator {
17 |         return Coordinator(recognizedText: $recognizedText)
18 |     }
19 |     
20 |     func makeUIViewController(context: UIViewControllerRepresentableContext<ScanningView>) -> VNDocumentCameraViewController {
21 |         let documentCameraViewController = VNDocumentCameraViewController()
22 |         documentCameraViewController.delegate = context.coordinator
23 |         return documentCameraViewController
24 |     }
25 |     
26 |     func updateUIViewController(_ uiViewController: VNDocumentCameraViewController, context: UIViewControllerRepresentableContext<ScanningView>) {
27 |         
28 |     }
29 |     
30 |     class Coordinator: NSObject, VNDocumentCameraViewControllerDelegate {
31 |         
32 |         var recognizedText: Binding<String>
33 |         private let textRecognizer: TextRecognizer
34 |         
35 |         init(recognizedText: Binding<String>) {
36 |             self.recognizedText = recognizedText
37 |             textRecognizer = TextRecognizer(recognizedText: recognizedText)
38 |         }
39 |                 
40 |         public func documentCameraViewController(_ controller: VNDocumentCameraViewController, didFinishWith scan: VNDocumentCameraScan) {
41 |             var images = [CGImage]()
42 |             for pageIndex in 0 ..< scan.pageCount {
43 |                 let image = scan.imageOfPage(at: pageIndex)
44 |                 if let cgImage = image.cgImage {
45 |                     images.append(cgImage)
46 |                 }
47 |             }
48 |             textRecognizer.recognizeText(from: images)
49 |             controller.navigationController?.popViewController(animated: true)
50 |         }
51 |         
52 |     }
53 | 
54 | }
55 | 


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/TextRecognizerSwiftUI/SceneDelegate.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  SceneDelegate.swift
 3 | //  TextRecognizerSwiftUI
 4 | //
 5 | //  Created by Martin Mitrevski on 16.06.19.
 6 | //  Copyright © 2019 Mitrevski. All rights reserved.
 7 | //
 8 | 
 9 | import UIKit
10 | import SwiftUI
11 | 
12 | class SceneDelegate: UIResponder, UIWindowSceneDelegate {
13 | 
14 |     var window: UIWindow?
15 | 
16 |     func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
17 |         // Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
18 |         // If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
19 |         // This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
20 | 
21 |         // Use a UIHostingController as window root view controller
22 |         if let windowScene = scene as? UIWindowScene {
23 |             let window = UIWindow(windowScene: windowScene)
24 |             window.rootViewController = UIHostingController(rootView: ContentView())
25 |             self.window = window
26 |             window.makeKeyAndVisible()
27 |         }
28 |     }
29 | 
30 |     func sceneDidDisconnect(_ scene: UIScene) {
31 |         // Called as the scene is being released by the system.
32 |         // This occurs shortly after the scene enters the background, or when its session is discarded.
33 |         // Release any resources associated with this scene that can be re-created the next time the scene connects.
34 |         // The scene may re-connect later, as its session was not neccessarily discarded (see `application:didDiscardSceneSessions` instead).
35 |     }
36 | 
37 |     func sceneDidBecomeActive(_ scene: UIScene) {
38 |         // Called when the scene has moved from an inactive state to an active state.
39 |         // Use this method to restart any tasks that were paused (or not yet started) when the scene was inactive.
40 |     }
41 | 
42 |     func sceneWillResignActive(_ scene: UIScene) {
43 |         // Called when the scene will move from an active state to an inactive state.
44 |         // This may occur due to temporary interruptions (ex. an incoming phone call).
45 |     }
46 | 
47 |     func sceneWillEnterForeground(_ scene: UIScene) {
48 |         // Called as the scene transitions from the background to the foreground.
49 |         // Use this method to undo the changes made on entering the background.
50 |     }
51 | 
52 |     func sceneDidEnterBackground(_ scene: UIScene) {
53 |         // Called as the scene transitions from the foreground to the background.
54 |         // Use this method to save data, release shared resources, and store enough scene-specific state information
55 |         // to restore the scene back to its current state.
56 |     }
57 | 
58 | 
59 | }
60 | 
61 | 


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/TextRecognizerSwiftUI/TextRecognizer.swift:
--------------------------------------------------------------------------------
 1 | //  Created by Martin Mitrevski on 15.06.19.
 2 | 
 3 | import Vision
 4 | import SwiftUI
 5 | import Combine
 6 | 
 7 | public struct TextRecognizer {
 8 |     
 9 |     @Binding var recognizedText: String
10 |     
11 |     private let textRecognitionWorkQueue = DispatchQueue(label: "TextRecognitionQueue",
12 |                                                          qos: .userInitiated, attributes: [], autoreleaseFrequency: .workItem)
13 |     
14 |     func recognizeText(from images: [CGImage]) {
15 |         self.recognizedText = ""
16 |         var tmp = ""
17 |         let textRecognitionRequest = VNRecognizeTextRequest { (request, error) in
18 |             guard let observations = request.results as? [VNRecognizedTextObservation] else {
19 |                 print("The observations are of an unexpected type.")
20 |                 return
21 |             }
22 |             // Concatenate the recognised text from all the observations.
23 |             let maximumCandidates = 1
24 |             for observation in observations {
25 |                 guard let candidate = observation.topCandidates(maximumCandidates).first else { continue }
26 |                 tmp += candidate.string + "\n"
27 |             }
28 |         }
29 |         textRecognitionRequest.recognitionLevel = .accurate
30 |         for image in images {
31 |             let requestHandler = VNImageRequestHandler(cgImage: image, options: [:])
32 |             
33 |             do {
34 |                 try requestHandler.perform([textRecognitionRequest])
35 |             } catch {
36 |                 print(error)
37 |             }
38 |             tmp += "\n\n"
39 |         }
40 |         self.recognizedText = tmp
41 |     }
42 |     
43 | }
44 | 


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