楽しく簡単に！QRコードの読み取り機能を実装しよう

こちらは iOSDC Japan 2024 のトークで使用したスライドです。

https://iosdc.jp/2024/
https://fortee.jp/iosdc-japan-2024/proposal/737bea3f-e4ce-4358-81d2-a96177d56004

Transcript

1. ָ͘͠؆୯ʹʂ
   23ίʔυͷಡΈऔΓػೳΛ࣮૷͠Α͏ 
   
   J04%$
   +BQBO
   
2. ࣗݾ঺հ ΃Μ͗Μ͞Μ
   !QFOHVJOTBO@QH
   ϑΣϯϦϧ
   J04ΤϯδχΞ
   ಘҙͳݴޠɿؔ੢ห
   ۤखͳݴޠɿஸೡͳ೔ຊޠ
3. એ఻ w ࠾༻ެࣜ-*/&࢝Ί·ͨ͠ʂ w εϙϯαʔϒʔε
4. ͸͡Ίʹ w J04%$ͷτʔΫ͸Έͳ͞Μͱͷίϛϡχέʔγϣϯͷ৔
   w ฉ͍͍ͯΔํ͸ϦΞΫγϣϯΛ͓ئ͍͠·͢ʂʂ
   w χίχίͷΈΜͳ͸ʮϊʯʮϔʯͰϦΞΫγϣϯΛཔΜͩʂ
5. w εϚϗͰ23ίʔυͷಡΈऔΓΛߦͬͨ͜ͱ͕͋Δਓʁ
6. w εϚϗͰ23ίʔυͷಡΈऔΓΛߦͬͨ͜ͱ͕͋Δਓʁ 
7. w 23ίʔυͷಡΈऔΓػೳΛ࣮૷ͨ͜͠ͱ͕͋Δਓʁ
8. w 23ಡΈऔΓػೳͷ࣮૷ָ͕͍͠ɾշదɾ΋ͬͱ΍Γ͍ͨਓʁ
9. 😢
10. 23ίʔυಡΈऔΓ͸
    ίʔυ͕ෳࡶʹͳΔ
11. https://developer.apple.com/wwdc22/10025
12. ೖྗσόΠε Χϝϥ ˠ https://developer.apple.com/wwdc22/10025
13. ೖྗσόΠε Χϝϥ ˠ ϓϨϏϡʔදࣔˠ https://developer.apple.com/wwdc22/10025
14. ೖྗσόΠε Χϝϥ ˠ ϓϨϏϡʔදࣔˠ ˡόʔίʔυͷ
    ɹ৘ใΛऔಘ https://developer.apple.com/wwdc22/10025
15. ೖྗσόΠε Χϝϥ ˠ ϓϨϏϡʔදࣔˠ ˡόʔίʔυͷ
    ɹ৘ใΛऔಘ ˡೖग़ྗηογϣϯ https://developer.apple.com/wwdc22/10025
16. struct AVFoundationQRCodeScanner: UIViewControllerRepresentable { func makeUIViewController(context: Context) -> UIViewController { let viewController = UIViewController() return viewController } func updateUIViewController(_ uiViewController: UIViewController, context: Context) { } }
17. struct AVFoundationQRCodeScanner: UIViewControllerRepresentable { private let session = AVCaptureSession() private let sessionQueue = DispatchQueue(label: "sessionQueue") func makeUIViewController(context: Context) -> UIViewController { let viewController = UIViewController() return viewController } func updateUIViewController(_ uiViewController: UIViewController, context: Context) { } }
18. struct AVFoundationQRCodeScanner: UIViewControllerRepresentable { private let session = AVCaptureSession() private let sessionQueue = DispatchQueue(label: "sessionQueue") func makeUIViewController(context: Context) -> UIViewController { let viewController = UIViewController() sessionQueue.async { self.configureSession(metadataObjectTypes: [.qr], delegate: context.coordinator) self.session.startRunning() } return viewController } func updateUIViewController(_ uiViewController: UIViewController, context: Context) { } } private extension AVFoundationQRCodeScanner { func configureSession( metadataObjectTypes: [AVMetadataObject.ObjectType], delegate: AVCaptureMetadataOutputObjectsDelegate ) { defer { session.commitConfiguration() } session.beginConfiguration() } }
19. struct AVFoundationQRCodeScanner: UIViewControllerRepresentable { private let session = AVCaptureSession() private let sessionQueue = DispatchQueue(label: "sessionQueue") func makeUIViewController(context: Context) -> UIViewController { let viewController = UIViewController() sessionQueue.async { self.configureSession(metadataObjectTypes: [.qr], delegate: context.coordinator) self.session.startRunning() } return viewController } func updateUIViewController(_ uiViewController: UIViewController, context: Context) { } } private extension AVFoundationQRCodeScanner { func configureSession( metadataObjectTypes: [AVMetadataObject.ObjectType], delegate: AVCaptureMetadataOutputObjectsDelegate ) { defer { session.commitConfiguration() } session.beginConfiguration() let videoDevice = AVCaptureDevice.default(.builtInWideAngleCamera, for: .video, position: .back) guard let videoDevice else { return } do { let videoDeviceInput = try AVCaptureDeviceInput(device: videoDevice) if session.canAddInput(videoDeviceInput) { session.addInput(videoDeviceInput) } } catch { return } } }
20. struct AVFoundationQRCodeScanner: UIViewControllerRepresentable { @Binding var recognizedPayload: String private let session = AVCaptureSession() private let sessionQueue = DispatchQueue(label: "sessionQueue") private let metadataOutput = AVCaptureMetadataOutput() private let metadataObjectQueue = DispatchQueue(label: "metadataObjectQueue") init(recognizedPayload: Binding<String>) { self._recognizedPayload = recognizedPayload } func makeUIViewController(context: Context) -> UIViewController { let viewController = UIViewController() sessionQueue.async { self.configureSession(metadataObjectTypes: [.qr], delegate: context.coordinator) self.session.startRunning() } return viewController } func updateUIViewController(_ uiViewController: UIViewController, context: Context) { } func makeCoordinator() -> Coordinator { Coordinator(parent: self) } final class Coordinator: NSObject, AVCaptureMetadataOutputObjectsDelegate { private let parent: AVFoundationQRCodeScanner init(parent: AVFoundationQRCodeScanner) { self.parent = parent } func metadataOutput(_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection) { guard let metadataObject = metadataObjects.first, let machineReadableCode = metadataObject as? AVMetadataMachineReadableCodeObject, machineReadableCode.type == .qr, let stringValue = machineReadableCode.stringValue else { parent.recognizedPayload = "" return } parent.recognizedPayload = stringValue } } } private extension AVFoundationQRCodeScanner { func configureSession( metadataObjectTypes: [AVMetadataObject.ObjectType], delegate: AVCaptureMetadataOutputObjectsDelegate ) { defer { session.commitConfiguration() } session.beginConfiguration() let videoDevice = AVCaptureDevice.default(.builtInWideAngleCamera, for: .video, position: .back) guard let videoDevice else { return } do { let videoDeviceInput = try AVCaptureDeviceInput(device: videoDevice) if session.canAddInput(videoDeviceInput) { session.addInput(videoDeviceInput) } } catch { return } if session.canAddOutput(metadataOutput) { session.addOutput(metadataOutput) metadataOutput.metadataObjectTypes = metadataObjectTypes metadataOutput.setMetadataObjectsDelegate(delegate, queue: metadataObjectQueue) } } }
21. struct AVFoundationQRCodeScanner: UIViewControllerRepresentable { @Binding var recognizedPayload: String private let session = AVCaptureSession() private let sessionQueue = DispatchQueue(label: "sessionQueue") private let metadataOutput = AVCaptureMetadataOutput() private let metadataObjectQueue = DispatchQueue(label: "metadataObjectQueue") private let previewLayer: AVCaptureVideoPreviewLayer init(recognizedPayload: Binding<String>) { self._recognizedPayload = recognizedPayload self.previewLayer = Self.makePreviewLayer(session: self.session) } func makeUIViewController(context: Context) -> UIViewController { let viewController = UIViewController() viewController.view.layer.masksToBounds = true viewController.view.layer.addSublayer(previewLayer) previewLayer.frame = viewController.view.layer.bounds sessionQueue.async { self.configureSession(metadataObjectTypes: [.qr], delegate: context.coordinator) self.session.startRunning() } return viewController } func updateUIViewController(_ uiViewController: UIViewController, context: Context) { previewLayer.frame = uiViewController.view.layer.bounds } func makeCoordinator() -> Coordinator { Coordinator(parent: self) } final class Coordinator: NSObject, AVCaptureMetadataOutputObjectsDelegate { private let parent: AVFoundationQRCodeScanner init(parent: AVFoundationQRCodeScanner) { self.parent = parent } func metadataOutput(_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection) { guard let metadataObject = metadataObjects.first, let machineReadableCode = metadataObject as? AVMetadataMachineReadableCodeObject, machineReadableCode.type == .qr, let stringValue = machineReadableCode.stringValue else { parent.recognizedPayload = "" return } parent.recognizedPayload = stringValue } } } private extension AVFoundationQRCodeScanner { func configureSession( metadataObjectTypes: [AVMetadataObject.ObjectType], delegate: AVCaptureMetadataOutputObjectsDelegate ) { defer { session.commitConfiguration() } session.beginConfiguration() let videoDevice = AVCaptureDevice.default(.builtInWideAngleCamera, for: .video, position: .back) guard let videoDevice else { return } do { let videoDeviceInput = try AVCaptureDeviceInput(device: videoDevice) if session.canAddInput(videoDeviceInput) { session.addInput(videoDeviceInput) } } catch { return } if session.canAddOutput(metadataOutput) { session.addOutput(metadataOutput) metadataOutput.metadataObjectTypes = metadataObjectTypes metadataOutput.setMetadataObjectsDelegate(delegate, queue: metadataObjectQueue) } } } private extension AVFoundationQRCodeScanner { static func makePreviewLayer(session: AVCaptureSession) -> AVCaptureVideoPreviewLayer { let layer = AVCaptureVideoPreviewLayer(session: session) layer.videoGravity = .resizeAspectFill layer.connection?.videoOrientation = .portrait return layer } }
22. struct AVFoundationQRCodeScanner: UIViewControllerRepresentable { @Binding var recognizedPayload: String private let session = AVCaptureSession() private let sessionQueue = DispatchQueue(label: "sessionQueue") private let metadataOutput = AVCaptureMetadataOutput() private let metadataObjectQueue = DispatchQueue(label: "metadataObjectQueue") private let previewLayer: AVCaptureVideoPreviewLayer init(recognizedPayload: Binding<String>) { self._recognizedPayload = recognizedPayload self.previewLayer = Self.makePreviewLayer(session: self.session) } func makeUIViewController(context: Context) -> UIViewController { let viewController = UIViewController() viewController.view.layer.masksToBounds = true viewController.view.layer.addSublayer(previewLayer) previewLayer.frame = viewController.view.layer.bounds sessionQueue.async { self.configureSession(metadataObjectTypes: [.qr], delegate: context.coordinator) self.session.startRunning() } return viewController } func updateUIViewController(_ uiViewController: UIViewController, context: Context) { previewLayer.frame = uiViewController.view.layer.bounds } func makeCoordinator() -> Coordinator { Coordinator(parent: self) } final class Coordinator: NSObject, AVCaptureMetadataOutputObjectsDelegate { private let parent: AVFoundationQRCodeScanner init(parent: AVFoundationQRCodeScanner) { self.parent = parent } func metadataOutput(_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection) { guard let metadataObject = metadataObjects.first, let machineReadableCode = metadataObject as? AVMetadataMachineReadableCodeObject, machineReadableCode.type == .qr, let stringValue = machineReadableCode.stringValue else { parent.recognizedPayload = "" return } parent.recognizedPayload = stringValue } } } private extension AVFoundationQRCodeScanner { func configureSession( metadataObjectTypes: [AVMetadataObject.ObjectType], delegate: AVCaptureMetadataOutputObjectsDelegate ) { defer { session.commitConfiguration() } session.beginConfiguration() let videoDevice = AVCaptureDevice.default(.builtInWideAngleCamera, for: .video, position: .back) guard let videoDevice else { return } do { let videoDeviceInput = try AVCaptureDeviceInput(device: videoDevice) if session.canAddInput(videoDeviceInput) { session.addInput(videoDeviceInput) } } catch { return } if session.canAddOutput(metadataOutput) { session.addOutput(metadataOutput) metadataOutput.metadataObjectTypes = metadataObjectTypes metadataOutput.setMetadataObjectsDelegate(delegate, queue: metadataObjectQueue) } } } private extension AVFoundationQRCodeScanner { static func makePreviewLayer(session: AVCaptureSession) -> AVCaptureVideoPreviewLayer { let layer = AVCaptureVideoPreviewLayer(session: session) layer.videoGravity = .resizeAspectFill layer.connection?.videoOrientation = .portrait return layer } } 😫
24. DataScannerViewController
25. %BUB4DBOOFS7JFX$POUSPMMFS w 7JTJPO,JUϑϨʔϜϫʔΫʹΑͬͯఏڙ
    w 6*7JFX$POUSPMMFSͷαϒΫϥε
    w J04
    Ҏ্Ͱར༻͢Δ͜ͱ͕Մೳ
    w Ұ෦୺຤Ͱ͸ར༻͢Δ͜ͱ͕Ͱ͖ͳ͍
26. 7JTJPO
    WT
    7JTJPO,JU w ίϯϐϡʔλϏδϣϯΞϧΰϦζϜΛ 
 ར༻ͯ͠ɺը૾ॲཧɾಈըॲཧΛߦ͏
    w ػցֶशϞσϧΛར༻ w ΧϝϥΛར༻ͨ͠৘ใͷݕग़΍ɺ 
 औಘͨ͠৘ใΛදࣔ͢Δ6*Λఏڙ͢Δ
    w ಺෦ͷը૾ॲཧͰ͸7JTJPO͕ಈ͍͍ͯΔʁ 7JTJPO 7JTJPO,JU
27. %BUB4DBOOFS7JFX$POUSPMMFSͷ஫ҙ఺ w ೥Ҏ߱ͷ/FVSBM
    &OHJOFΛ౥ࡌͨ͠୺຤Ͱ͔͠ಈ࡞͠ͳ͍
    w DataScannerViewController.isSupported
    Ͱ 
 ར༻Մೳͳ୺຤͔൑ఆͰ͖Δ
28. σϞ
29. struct VisionKitQRCodeScanner: UIViewControllerRepresentable { @Binding var recognizedPayload: String func makeUIViewController(context: Context) -> DataScannerViewController { let dataScannerViewController = DataScannerViewController( recognizedDataTypes: [.barcode(symbologies: [.qr])] ) dataScannerViewController.delegate = context.coordinator try? dataScannerViewController.startScanning() return dataScannerViewController } func updateUIViewController(_ uiViewController: DataScannerViewController, context: Context) { } func makeCoordinator() -> Coordinator { Coordinator(parent: self) } final class Coordinator: NSObject, DataScannerViewControllerDelegate { private let parent: VisionKitQRCodeScanner init(parent: VisionKitQRCodeScanner) { self.parent = parent } func dataScanner(_ dataScanner: DataScannerViewController, didAdd addedItems: [RecognizedItem], allItems: [RecognizedItem]) { guard case .barcode(let barcode) = addedItems.first else { return } if let payloadStringValue = barcode.payloadStringValue { parent.recognizedPayload = payloadStringValue } } func dataScanner(_ dataScanner: DataScannerViewController, didRemove removedItems: [RecognizedItem], allItems: [RecognizedItem]) { parent.recognizedPayload = "" } } } ΊͪΌͪ͘Όγϯϓϧʂʂʂ
30. struct VisionKitQRCodeScanner: UIViewControllerRepresentable { @Binding var recognizedPayload: String func makeUIViewController(context: Context) -> DataScannerViewController { let dataScannerViewController = DataScannerViewController( recognizedDataTypes: [.barcode(symbologies: [.qr])] ) dataScannerViewController.delegate = context.coordinator try? dataScannerViewController.startScanning() return dataScannerViewController } func updateUIViewController(_ uiViewController: DataScannerViewController, context: Context) { } func makeCoordinator() -> Coordinator { Coordinator(parent: self) } final class Coordinator: NSObject, DataScannerViewControllerDelegate { private let parent: VisionKitQRCodeScanner init(parent: VisionKitQRCodeScanner) { self.parent = parent } func dataScanner(_ dataScanner: DataScannerViewController, didAdd addedItems: [RecognizedItem], allItems: [RecognizedItem]) { guard case .barcode(let barcode) = addedItems.first else { return } if let payloadStringValue = barcode.payloadStringValue { parent.recognizedPayload = payloadStringValue } } func dataScanner(_ dataScanner: DataScannerViewController, didRemove removedItems: [RecognizedItem], allItems: [RecognizedItem]) { parent.recognizedPayload = "" } } } struct AVFoundationQRCodeScanner: UIViewControllerRepresentable { @Binding var recognizedPayload: String private let session = AVCaptureSession() private let sessionQueue = DispatchQueue(label: "sessionQueue") private let metadataOutput = AVCaptureMetadataOutput() private let metadataObjectQueue = DispatchQueue(label: "metadataObjectQueue") private let previewLayer: AVCaptureVideoPreviewLayer init(recognizedPayload: Binding<String>) { self._recognizedPayload = recognizedPayload self.previewLayer = Self.makePreviewLayer(session: self.session) } func makeUIViewController(context: Context) -> UIViewController { let viewController = UIViewController() viewController.view.layer.masksToBounds = true viewController.view.layer.addSublayer(previewLayer) previewLayer.frame = viewController.view.layer.bounds sessionQueue.async { self.configureSession(metadataObjectTypes: [.qr], delegate: context.coordinator) self.session.startRunning() } return viewController } func updateUIViewController(_ uiViewController: UIViewController, context: Context) { previewLayer.frame = uiViewController.view.layer.bounds } func makeCoordinator() -> Coordinator { Coordinator(parent: self) } final class Coordinator: NSObject, AVCaptureMetadataOutputObjectsDelegate { private let parent: AVFoundationQRCodeScanner init(parent: AVFoundationQRCodeScanner) { self.parent = parent } func metadataOutput(_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection) { guard let metadataObject = metadataObjects.first, let machineReadableCode = metadataObject as? AVMetadataMachineReadableCodeObject, machineReadableCode.type == .qr, let stringValue = machineReadableCode.stringValue else { parent.recognizedPayload = "" return } parent.recognizedPayload = stringValue } } } private extension AVFoundationQRCodeScanner { func configureSession( metadataObjectTypes: [AVMetadataObject.ObjectType], delegate: AVCaptureMetadataOutputObjectsDelegate ) { defer { session.commitConfiguration() } session.beginConfiguration() let videoDevice = AVCaptureDevice.default(.builtInWideAngleCamera, for: .video, position: .back) guard let videoDevice else { return } do { let videoDeviceInput = try AVCaptureDeviceInput(device: videoDevice) if session.canAddInput(videoDeviceInput) { session.addInput(videoDeviceInput) } } catch { return } if session.canAddOutput(metadataOutput) { session.addOutput(metadataOutput) metadataOutput.metadataObjectTypes = metadataObjectTypes metadataOutput.setMetadataObjectsDelegate(delegate, queue: metadataObjectQueue) } } } private extension AVFoundationQRCodeScanner { static func makePreviewLayer(session: AVCaptureSession) -> AVCaptureVideoPreviewLayer { let layer = AVCaptureVideoPreviewLayer(session: session) layer.videoGravity = .resizeAspectFill layer.connection?.videoOrientation = .portrait return layer } } 7JTJPO,JU "7'PVOEBUJPO
31. ΧϝϥىಈɾϓϨϏϡʔදࣔɾεΩϟϯ։࢝ struct VisionKitQRCodeScanner: UIViewControllerRepresentable { @Binding var recognizedPayload: String func makeUIViewController(context: Context) -> DataScannerViewController { let dataScannerViewController = DataScannerViewController( recognizedDataTypes: [.barcode(symbologies: [.qr])] ) dataScannerViewController.delegate = context.coordinator try? dataScannerViewController.startScanning() return dataScannerViewController } func updateUIViewController(_ uiViewController: DataScannerViewController, context: Context) { } func makeCoordinator() -> Coordinator { Coordinator(parent: self) } final class Coordinator: NSObject, DataScannerViewControllerDelegate { private let parent: VisionKitQRCodeScanner init(parent: VisionKitQRCodeScanner) { self.parent = parent } func dataScanner(_ dataScanner: DataScannerViewController, didAdd addedItems: [RecognizedItem], allItems: [RecognizedItem]) { guard case .barcode(let barcode) = addedItems.first else { return } if let payloadStringValue = barcode.payloadStringValue { parent.recognizedPayload = payloadStringValue } } func dataScanner(_ dataScanner: DataScannerViewController, didRemove removedItems: [RecognizedItem], allItems: [RecognizedItem]) { parent.recognizedPayload = "" } } }
32. ΧϝϥىಈɾϓϨϏϡʔදࣔɾεΩϟϯ։࢝ func makeUIViewController(context: Context) -> DataScannerViewController { let dataScannerViewController = DataScannerViewController( recognizedDataTypes: [.barcode(symbologies: [.qr])] ) dataScannerViewController.delegate = context.coordinator try? dataScannerViewController.startScanning() return dataScannerViewController }
33. ΧϝϥىಈɾϓϨϏϡʔදࣔɾεΩϟϯ։࢝ func makeUIViewController(context: Context) -> DataScannerViewController { let dataScannerViewController = DataScannerViewController( recognizedDataTypes: [.barcode(symbologies: [.qr])] ) dataScannerViewController.delegate = context.coordinator try? dataScannerViewController.startScanning() return dataScannerViewController }
34. 23ίʔυͷ৘ใΛऔಘ struct VisionKitQRCodeScanner: UIViewControllerRepresentable { @Binding var recognizedPayload: String func makeUIViewController(context: Context) -> DataScannerViewController { let dataScannerViewController = DataScannerViewController( recognizedDataTypes: [.barcode(symbologies: [.qr])] ) dataScannerViewController.delegate = context.coordinator try? dataScannerViewController.startScanning() return dataScannerViewController } func updateUIViewController(_ uiViewController: DataScannerViewController, context: Context) { } func makeCoordinator() -> Coordinator { Coordinator(parent: self) } final class Coordinator: NSObject, DataScannerViewControllerDelegate { private let parent: VisionKitQRCodeScanner init(parent: VisionKitQRCodeScanner) { self.parent = parent } func dataScanner(_ dataScanner: DataScannerViewController, didAdd addedItems: [RecognizedItem], allItems: [RecognizedItem]) { guard case .barcode(let barcode) = addedItems.first else { return } if let payloadStringValue = barcode.payloadStringValue { parent.recognizedPayload = payloadStringValue } } func dataScanner(_ dataScanner: DataScannerViewController, didRemove removedItems: [RecognizedItem], allItems: [RecognizedItem]) { parent.recognizedPayload = "" } } }
35. 23ίʔυͷ৘ใΛऔಘ final class Coordinator: NSObject, DataScannerViewControllerDelegate { ... /// σʔλεΩϟφ͕ΞΠςϜͷೝࣝΛ։࢝͢ΔͱԠ౴͠·͢ɻ func dataScanner(_ dataScanner: DataScannerViewController, didAdd addedItems: [RecognizedItem], allItems: [RecognizedItem]) { guard case .barcode(let barcode) = addedItems.first else { return } if let payloadStringValue = barcode.payloadStringValue { parent.recognizedPayload = payloadStringValue } } /// σʔλεΩϟφ͕ΞΠςϜͷೝࣝΛఀࢭͨ͠ͱ͖ʹԠ౴͠·͢ɻ func dataScanner(_ dataScanner: DataScannerViewController, didRemove removedItems: [RecognizedItem], allItems: [RecognizedItem]) { parent.recognizedPayload = "" } }
36. 23ίʔυͷ৘ใΛऔಘ final class Coordinator: NSObject, DataScannerViewControllerDelegate { ... /// σʔλεΩϟφ͕ΞΠςϜͷೝࣝΛ։࢝͢ΔͱԠ౴͠·͢ɻ func dataScanner(_ dataScanner: DataScannerViewController, didAdd addedItems: [RecognizedItem], allItems: [RecognizedItem]) { guard case .barcode(let barcode) = addedItems.first else { return } if let payloadStringValue = barcode.payloadStringValue { parent.recognizedPayload = payloadStringValue } } /// σʔλεΩϟφ͕ΞΠςϜͷೝࣝΛఀࢭͨ͠ͱ͖ʹԠ౴͠·͢ɻ func dataScanner(_ dataScanner: DataScannerViewController, didRemove removedItems: [RecognizedItem], allItems: [RecognizedItem]) { parent.recognizedPayload = "" } }
37. ػೳΛ௥Ճͯ͠ΈΔ
38. ϑΥʔΧεதͷ 
 23ίʔυʹ 
 ϋΠϥΠτΛදࣔ
39. ΧϝϥىಈɾϓϨϏϡʔදࣔɾεΩϟϯ։࢝ let dataScannerViewController = DataScannerViewController( recognizedDataTypes: [.barcode(symbologies: [.qr])], isHighlightingEnabled: true )
40. 23ίʔυλοϓ࣌ͷ 
 ΞΫγϣϯΛ௥Ճ
41. 23ίʔυλοϓ࣌ͷΞΫγϣϯΛ௥Ճ final class Coordinator: NSObject, DataScannerViewControllerDelegate { ... /// σʔλεΩϟφ͕ೝࣝͨ͠ΞΠςϜΛਓ͕λοϓ͢ΔͱԠ౴͠·͢ɻ func dataScanner(_ dataScanner: DataScannerViewController, didTapOn item: RecognizedItem) { guard case .barcode(let barcode) = item else { return } if let payloadStringValue = barcode.payloadStringValue, let url = URL(string: payloadStringValue) { UIApplication.shared.open(url) } } }
42. %BUB4DBOOFS7JFX$POUSPMMFS͕Ͱ͖Δ͜ͱ w ΠχγϟϥΠβͰσʔλεΩϟφͷΦϓγϣϯΛઃఆ͢Δ͜ͱ͕Ͱ͖Δ
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43. struct VisionKitQRCodeScanner: UIViewControllerRepresentable { @Binding var recognizedPayload: String func makeUIViewController(context: Context) -> DataScannerViewController { let dataScannerViewController = DataScannerViewController( recognizedDataTypes: [.barcode(symbologies: [.qr])], isHighlightingEnabled: true ) dataScannerViewController.delegate = context.coordinator try? dataScannerViewController.startScanning() return dataScannerViewController } func updateUIViewController(_ uiViewController: DataScannerViewController, context: Context) { } func makeCoordinator() -> Coordinator { Coordinator(parent: self) } final class Coordinator: NSObject, DataScannerViewControllerDelegate { private let parent: VisionKitQRCodeScanner init(parent: VisionKitQRCodeScanner) { self.parent = parent } func dataScanner(_ dataScanner: DataScannerViewController, didAdd addedItems: [RecognizedItem], allItems: [RecognizedItem]) { guard case .barcode(let barcode) = addedItems.first else { return } if let payloadStringValue = barcode.payloadStringValue { parent.recognizedPayload = payloadStringValue } } func dataScanner(_ dataScanner: DataScannerViewController, didRemove removedItems: [RecognizedItem], allItems: [RecognizedItem]) { parent.recognizedPayload = "" } func dataScanner(_ dataScanner: DataScannerViewController, didTapOn item: RecognizedItem) { guard case .barcode(let barcode) = item else { return } if let payloadStringValue = barcode.payloadStringValue, let url = URL(string: payloadStringValue) { UIApplication.shared.open(url) } } } }
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46. w 23ಡΈऔΓػೳָ͕͘͠ɾ؆୯ʹ࣮૷Ͱ͖ͦ͏ͩͳͱࢥͬͨਓʂ
47. 😄
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