iOS App：无法识别的选择器已发送至实例-录制视频AVFoundation

Question

我不断从我开发的应用程序中收到以下错误消息：

[AVCaptureVideoDataOutput startRecordingToOutputFileURL:recordingDelegate:]: unrecognized selector sent to instance 0x190e10

用于执行此操作的代码来自以下按钮，用于录制视频：

- (IBAction)takeVideo {
    AVCaptureMovieFileOutput *movieFileOutput = [[AVCaptureMovieFileOutput alloc] init];

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectoryPath = [paths objectAtIndex:0];
    NSString *movieFileName = [NSString stringWithFormat: @"something.mov"];
    NSString *mypath = [documentsDirectoryPath stringByAppendingPathComponent:movieFileName];
    NSURL *outputURL = [[NSURL alloc] initFileURLWithPath:mypath];

    [self.captureSession addOutput:movieFileOutput];
    [movieFileOutput startRecordingToOutputFileURL:outputURL recordingDelegate:self];
    [outputURL release];
}

我做错了什么？

请帮忙

Answer 1

您的类可能未实现AVCaptureFileOutputRecordingDelegate协议的所有必需方法：具体地说，您需要实现captureOutput:didFinishRecordingToOutputFileAtURL:fromConnections:error:

请参阅文档 。