触摸按钮时，我无法实现“相机开关”。 我仍然是Swift和iOS开发的新手，因此我目前实现的大多数代码都是通过教程进行的。
我尝试自行实现相机开关。 但是，这会导致此错误：
Multiple audio/video AVCaptureInputs are not currently supported
我理解该错误，但不确定如何在代码中正确实现switch功能。
这是切换/翻转功能：
@IBAction func FlipCamera(_ sender: Any) {
captureSession.stopRunning()
cameraPreviewlayer?.removeFromSuperlayer()
//cameraPreviewlayer = nil
//self.captureSession = nil
setupCaptureSession()
if currentCamera! == backCamera{
//print(currentCamera)
currentCamera = frontCamera}
else {
currentCamera = backCamera}
setupCaptureSession()
setupInputOutput()
setupPreviewLayer()
startRunningCaptureSession()
}
这是整个班级：
class CameraViewController :UIViewController {
func applyRoundCorner(_ object: AnyObject){
object.layer.cornerRadius = (object.frame.size.width)/2
object.layer.masksToBounds = true
}
@IBOutlet weak var cameraButton: UIButton!
@IBOutlet weak var imagePreview: UIImageView!
@IBAction func Library(_ sender: Any) {
}
@IBAction func FlipCamera(_ sender: Any) {
captureSession.stopRunning()
cameraPreviewlayer?.removeFromSuperlayer()
//cameraPreviewlayer = nil
//self.captureSession = nil
setupCaptureSession()
if currentCamera! == backCamera{
//print(currentCamera)
currentCamera = frontCamera}
else {
currentCamera = backCamera}
setupCaptureSession()
setupInputOutput()
setupPreviewLayer()
startRunningCaptureSession()
}
var captureSession = AVCaptureSession()
var backCamera: AVCaptureDevice?
var frontCamera: AVCaptureDevice?
var currentCamera: AVCaptureDevice?
var cameraPreviewlayer: AVCaptureVideoPreviewLayer?
var photoOutput: AVCapturePhotoOutput?
var image: UIImage?
override func viewDidLoad() {
super.viewDidLoad()
self.applyRoundCorner(cameraButton)
setupCaptureSession()
setupInputOutput()
setupPreviewLayer()
startRunningCaptureSession()
}
func setupCaptureSession(){
captureSession.sessionPreset = AVCaptureSession.Preset.photo // Why exclamation point?
let availableDevice = AVCaptureDevice.DiscoverySession(deviceTypes: [AVCaptureDevice.DeviceType.builtInWideAngleCamera], mediaType: .video, position: .unspecified)
let devices = availableDevice.devices //back or front
for device in devices {
if device.position == AVCaptureDevice.Position.back{
backCamera = device
}else if device.position == AVCaptureDevice.Position.front{
frontCamera = device
}
}
currentCamera = backCamera
}
func setupInputOutput(){
do {
let captureDeviceInput = try AVCaptureDeviceInput(device: currentCamera!)
captureSession.addInput(captureDeviceInput)
photoOutput = AVCapturePhotoOutput()
photoOutput?.setPreparedPhotoSettingsArray([AVCapturePhotoSettings(format:[AVVideoCodecKey:AVVideoCodecType.jpeg])], completionHandler: nil)
captureSession.addOutput(photoOutput!)
}
catch{
print(error)
}
}
func setupPreviewLayer(){
cameraPreviewlayer = AVCaptureVideoPreviewLayer(session: captureSession)
cameraPreviewlayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill
cameraPreviewlayer?.connection?.videoOrientation = AVCaptureVideoOrientation.portrait
cameraPreviewlayer?.frame = self.imagePreview.frame
self.view.layer.insertSublayer(cameraPreviewlayer!, at: 0)
}
func startRunningCaptureSession(){
captureSession.startRunning()
}
@IBAction func TakePhoto(_ sender: Any) {
let settings = AVCapturePhotoSettings()
photoOutput?.capturePhoto(with: settings, delegate: self)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?){
if segue.identifier == "showPhotoSegue"{
let previewVC = segue.destination as! PreviewViewController
previewVC.image = self.image
}
}
}
extension CameraViewController: AVCapturePhotoCaptureDelegate{
func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
if let imageData = photo.fileDataRepresentation(){
image = UIImage(data: imageData)
performSegue(withIdentifier:"showPhotoSegue", sender: nil) }
}
}