objective-c - UIImagePickerController 不会录制视频

Question

我想用 UIImagePickerController 录制视频。我的问题是方法 [imagePickerController startVideoCapture]; 总是返回 0。我正在使用运行 iOS 5.1 的 iPhone 4S 测试应用程序。有人可以帮我解决这个问题吗:

- (IBAction)playButtonPushed:(id)sender
{
    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) 
    {
        UIView *videoView = self.videoViewController.view;
        UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] >init];
        imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
        imagePickerController.mediaTypes = [[NSArray alloc] initWithObjects: (NSString >*)kUTTypeMovie, nil];
        imagePickerController.showsCameraControls = NO;
        imagePickerController.toolbarHidden = NO;
        imagePickerController.wantsFullScreenLayout = YES;
        imagePickerController.allowsEditing = YES;
        imagePickerController.videoQuality = UIImagePickerControllerQualityTypeMedium;
        imagePickerController.videoMaximumDuration = 30;
        [imagePickerController startVideoCapture];
        imagePickerController.cameraViewTransform = > CGAffineTransformScale(self.imagePickerViewController.cameraViewTransform, CAMERA_TRANSFORM,  CAMERA_TRANSFORM);
        imagePickerController.delegate = self;

        [self.imagePickerViewController setCameraOverlayView:videoView];
        NSLog(@"%s videoCapture: %d", __PRETTY_FUNCTION__, [imagePickerController > startVideoCapture]
              );
        [self presentModalViewController:imagePickerViewController animated:YES];
    }
}


 - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    NSLog(@"didFinishPickingMediaWithInfo");
    NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];
    NSData *videoData = [NSData dataWithContentsOfURL:videoURL];
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    NSLog(@"Cancel");
}

Answer 1

我遇到了同样的问题，Apple 的文档没有帮助。那是因为他们没有提到如果您没有像这样将捕获模式设置为 .video，startVideoCapture() 会返回 false:

picker.cameraCaptureMode = .video

这对我有用，我现在可以捕捉视频了。