[iOS] QR코드 리더기

 

AVCaptureVideoPreviewLayer와 AVCaptureSession 선언

private var videoLayer = AVCaptureVideoPreviewLayer()
private var captureSession = AVCaptureSession()

 

기기가 회전될 때 View도 인식,  그리고 QR코드를 인식하기 위해 함수 선언

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    // Camera View rotate Notification
    NotificationCenter.default.addObserver(self,
                                           selector: #selector(orientationChanged(_:)),
                                           name: UIDevice.orientationDidChangeNotification,
                                           object: nil)
    startReading() // 인식 성공
}

override func viewWillDisappear(_ animated: Bool) {
    // Camera View rotate Notification
    NotificationCenter.default.removeObserver(self,
                                              name: UIDevice.orientationDidChangeNotification,
                                              object: nil)
    stopOnlyReading() // 인식 종료
}

// 기기가 회전할 때
@objc func orientationChanged(_ notification: Notification){
    if(UIDevice.current.userInterfaceIdiom == .pad){ // 아이패드 사용
        if let connection = videoLayer.connection{
            let currentConnection = UIDevice.current.orientation

            switch currentConnection {
            case .portrait:
                connection.videoOrientation = .portrait
            case .landscapeLeft:
                connection.videoOrientation = .landscapeRight
            case .landscapeRight:
                connection.videoOrientation = .landscapeLeft
            default:
                connection.videoOrientation = .portrait
            }
        }
	}
}

 

인식할 때 함수

// 인식 시작
private func startReading(){

    DispatchQueue.main.async {

        guard let captureDevice = AVCaptureDevice.default(for: .video) else{return}

        var input: AVCaptureDeviceInput?

        do{
            input = try AVCaptureDeviceInput(device: captureDevice)
        }
        catch let e{
            NSLog("Failed to AVCaptureDeviceInput \(e.localizedDescription)")
            return
        }

        self.captureSession = AVCaptureSession()
        self.captureSession.addInput(input!)

        let captureMetadataOutput = AVCaptureMetadataOutput()
        self.captureSession.addOutput(captureMetadataOutput)

        captureMetadataOutput.setMetadataObjectsDelegate(self, queue: DispatchQueue.main)
        captureMetadataOutput.metadataObjectTypes = [.qr]

        self.videoLayer = AVCaptureVideoPreviewLayer(session: self.captureSession)
        self.videoLayer.videoGravity = .resizeAspectFill
        self.videoLayer.frame = CGRect(x: 0, y: 0, width: self.view.frame.size.width,
                                       height: self.view.frame.size.height - (self.tabBarController?.tabBar.frame.height ?? 0.0))
        self.ViewScanner.layer.addSublayer(self.videoLayer)

        DispatchQueue.global(qos: .background).async {
            self.captureSession.startRunning()
        }

    }
}

 

결과값 처리

func metadataOutput(_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection) {

    if let metadataObject = metadataObjects.first{

        guard let readableObject = metadataObject as? AVMetadataMachineReadableCodeObject,
              let stringValue = readableObject.stringValue else{return}
        self.performSelector(onMainThread: #selector(authenticationAndStopReading),
                             with: nil,
                             waitUntilDone: false)
        qrCodeString = stringValue // 결과값
    }
}

 

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