Question

我正在以自定义视图（cameraView）打开相机，并且对于后置相机也可以正常工作，但是当我使用自定义转弯button(TurnCamera)将其切换到前端时，出现了以下问题：

输入“ AVCaptureFigVideoDevice：0x1035c9e80 [Front 摄影机] [com.apple.avfoundation.avcapturedevice.built-in_video：1]“

但是我的自定义摄像头视图仍在显示后置摄像头，并且得到captureSession.canAddInput(input) = false，我应该对前摄像头的info.plist进行任何访问吗？

我打开相机的代码是：-

func camera(){
        let devices = AVCaptureDevice.devices(for: AVMediaType.video)

        currentCaptureDevice = (usingFrontCamera ? getFrontCamera() : getBackCamera())

        print(currentCaptureDevice)

        for device in devices{

            do{
                let input = try AVCaptureDeviceInput(device: currentCaptureDevice!)
                    if captureSession.canAddInput(input){

                        captureSession.addInput(input)
                        sessionOutput.outputSettings = [AVVideoCodecKey: AVVideoCodecJPEG]

                        if captureSession.canAddOutput(sessionOutput){

                            captureSession.startRunning()
                            captureSession.addOutput(sessionOutput)
                            previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
                            previewLayer.videoGravity = AVLayerVideoGravity.resizeAspectFill
                            previewLayer.connection?.videoOrientation = AVCaptureVideoOrientation.portrait
                            cameraView.layer.addSublayer(previewLayer)
                            previewLayer.position = CGPoint(x: self.cameraView.frame.width/2, y: self.cameraView.frame.height/2)
                            cameraView.contentMode = .scaleToFill
                            previewLayer.bounds = cameraView.frame
                        }
                    }
                }
                catch{

                    print("error")
            }
        }
    }

“取回相机”功能是：-

func getBackCamera() -> AVCaptureDevice{
        return AVCaptureDevice.default(for: AVMediaType.video)!
    }

获取前置摄像头的功能是：-

func getFrontCamera() -> AVCaptureDevice?{
        let videoDevices = AVCaptureDevice.devices(for: AVMediaType.video)

        for device in videoDevices{
            let device = device as! AVCaptureDevice
            if device.position == AVCaptureDevice.Position.front {
                return device
            }
        }
        return nil
    }

切换摄像机的按钮动作：-

@IBAction func TurnCamera(_ sender: UIButton) {

        usingFrontCamera = !usingFrontCamera
        camera()

    }

在以下位置找到演示项目：-https://www.dropbox.com/s/6cfmbh3tnw5y4f7/SwitchingCamera.zip?dl=0

预先感谢

Answer 1

我得到了答案，当从后退切换到前端时，我没有删除捕获会话输入。

我仅在两个功能中进行过更改 1：-较早

func getBackCamera() -> AVCaptureDevice{
        return AVCaptureDevice.default(for: AVMediaType.video)!
    }

现在，

func getBackCamera() -> AVCaptureDevice{

        for i in captureSession.inputs {
            captureSession.removeInput(i as! AVCaptureInput)
        }

        return AVCaptureDevice.default(for: AVMediaType.video)!
    }

2：-较早

func getFrontCamera() -> AVCaptureDevice?{
        let videoDevices = AVCaptureDevice.devices(for: AVMediaType.video)

        for device in videoDevices{
            let device = device as! AVCaptureDevice
            if device.position == AVCaptureDevice.Position.front {
                return device
            }
        }
        return nil
    }

现在，

func getFrontCamera() -> AVCaptureDevice?{

        for i in captureSession.inputs {
            captureSession.removeInput(i as! AVCaptureInput)
        }

        let videoDevices = AVCaptureDevice.devices(for: AVMediaType.video)

        for device in videoDevices{
            let device = device
            if device.position == AVCaptureDevice.Position.front {

                return device

            }
        }
        return nil
    }

获取演示：-https://www.dropbox.com/s/p6opina5gtg8nvd/Updated%20Switching%20Camera%202.zip?dl=0

在前置摄像头的情况下无法添加输入，从前置摄像头切换回前置摄像头？

1 个答案: