今天我會介紹如何用swift開發相機且如何使用

    class CameraViewController: UIViewController {
    var captureSession: AVCaptureSession!
    var videoPreviewLayer: AVCaptureVideoPreviewLayer!

    override func viewDidLoad() {
        super.viewDidLoad()
        
        captureSession = AVCaptureSession()
        guard let videoCaptureDevice = AVCaptureDevice.default(.builtInWideAngleCamera, for: .video, position: .back) else { return }
        let videoInput: AVCaptureDeviceInput

        do {
            videoInput = try AVCaptureDeviceInput(device: videoCaptureDevice)
        } catch {
            return
        }

        if (captureSession.canAddInput(videoInput)) {
            captureSession.addInput(videoInput)
        } else {
            return
        }

        let videoOutput = AVCaptureVideoDataOutput()
        if (captureSession.canAddOutput(videoOutput)) {
            captureSession.addOutput(videoOutput)
        } else {
            return
        }

        videoPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
        videoPreviewLayer.frame = view.layer.bounds
        videoPreviewLayer.videoGravity = .resizeAspectFill
        view.layer.addSublayer(videoPreviewLayer)

        captureSession.startRunning()
        }
    }

其中在.builtInWideAngleCamera的地方可以選擇你想要的鏡頭
記得在用之前要在info裡加入請求相機權限歐