这是一些尝试在 Swift 中使用 AVKit 将视频录制到文件的简化代码。没有抛出错误，但检查时不存在文件。我遗漏了什么？
我尝试了几种不同的变体，结果都一样。没有创建文件。
extension UIViewController:AVCaptureFileOutputRecordingDelegate{
public func fileOutput(_ output: AVCaptureFileOutput, didFinishRecordingTo outputFileURL: URL, from connections: [AVCaptureConnection], error: Error?) {
if let error = error{
print(error.localizedDescription)
}
print("checking if \(outputFileURL.absoluteString) exists: \(FileManager.default.fileExists(atPath: outputFileURL.absoluteString))")
}
}
class ViewController: UIViewController {
var captureSession = AVCaptureSession()
var movieOutput = AVCaptureMovieFileOutput()
var previewLayer = AVCaptureVideoPreviewLayer()
@IBOutlet var cameraView: UIView!
override func viewWillAppear(_ animated: Bool) {
self.cameraView = self.view
guard let camera = AVCaptureDevice.default(.builtInWideAngleCamera, for: AVMediaType.video, position: .front) else{
return
}
do{
let input = try AVCaptureDeviceInput(device: camera)
if captureSession.canAddInput(input){
captureSession.addInput(input)
if captureSession.canAddOutput(movieOutput){
captureSession.addOutput(movieOutput)
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)
previewLayer.bounds = cameraView.frame
captureSession.startRunning()
let fileUrl = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0].appendingPathComponent("output.mov")
try? FileManager.default.removeItem(at: fileUrl)
print("recording to: \(fileUrl.absoluteString)")
movieOutput.startRecording(to: fileUrl, recordingDelegate: self)
DispatchQueue.main.asyncAfter(deadline: .now() + 5) {
self.movieOutput.stopRecording()
}
}
}
}
catch{
print("Error")
}
}
}