UIImagePickerController 不会录制视频

Question

我想用 录制视频UIImagePickerController。我的问题是该方法 [imagePickerController startVideoCapture];总是返回 0。我正在使用运行 iOS 5.1 的 iPhone 4S 测试该应用程序。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

如果我没记错的话，“startVideoCapture”方法是一个布尔值

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直接取自苹果文档：

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开始视频捕捉

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使用 UIImagePickerControllerCameraDevice 属性指定的相机开始视频捕获。\n- (BOOL)startVideoCapture\n返回值

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YES 表示成功，NO 表示失败。此方法可能会因各种原因返回 NO 值，其中包括：

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Movie capture is already in progress\n\nThe device does not support movie capture\n\nThe device is out of disk space\n

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讨论

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将此方法与自定义覆盖视图结合使用来启动电影的编程捕获。您可以在不离开界面的情况下拍摄多部影片，但要做到这一点需要您隐藏默认的图像选择器控件。

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在拍摄影片时调用此方法没有任何效果。您必须调用 stopVideoCapture 方法，然后等待关联的委托对象收到 imagePickerController:didFinishPickingMediaWithInfo: 消息，然后才能捕获另一部电影。

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当图像选择器的源类型设置为 UIImagePickerControllerSourceTypeCamera 以外的值时调用此方法会导致引发 NSInvalidArgumentException 异常。

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如果您需要其他选项或对影片捕获进行更多控制，请使用 AV Foundation 框架中的影片捕获方法。请参阅 AV Foundation 框架参考。\n可用性

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Available in iOS 4.0 and later.\n

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在\nUIImagePickerController.h\nstopVideoCapture 中声明

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停止视频捕获。\n- (void)stopVideoCapture\n讨论

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调用该方法停止视频采集后，系统会调用图片选择器 delegate\xe2\x80\x99s imagePickerController:didFinishPickingMediaWithInfo: 方法。\n可用性

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Available in iOS 4.0 and later.\n

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在\nUIImagePickerController.h 中声明

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