Question

我已经实现了代码来执行视频录制功能。它在3GS设备上运行良好。我想根据一些计时器设置来限制视频录制。可以说，我想让用户只进行20秒或35秒的视频录制。我怎样才能做到这一点？我可以在录制视频时在媒体播放器顶部显示计时器控件吗？

请建议我。

以下是我的视频录制代码：

    UIImagePickerController *pickerController = 
                       [[[UIImagePickerController alloc] init] autorelease];
    pickerController.delegate = self;
    pickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
    pickerController.showsCameraControls = YES;
    pickerController.mediaTypes = [NSArray arrayWithObject:(id)kUTTypeMovie];
    [self presentModalViewController:pickerController animated:YES];

Answer 1

videoMaximumDuration需要NSTimeInterval，这是浮点值的tpyedef。所以你应该传递一个浮点值。试试这样：

UIImagePickerController *pickerController = [[UIImagePickerController alloc] init];
pickerController.delegate = self;
pickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
pickerController.showsCameraControls = YES;
pickerController.mediaTypes = [NSArray arrayWithObject:(NSString *)kUTTypeMovie]; // kUTTypeMovie is actually an NSString.
pickerController.videoMaximumDuration = 30.0f; // limits video length to 30 seconds.
[self presentModalViewController:pickerController animated:YES];
[pickerController release];

Answer 2

UIImagePickerController类的属性videoMaximumDuration适用于NSTimeInterval。

默认情况下，其值设置为 10分钟，但您可以根据需要更改浮动值。

因此，如果您创建名为UIImagePickerController的{{1}}类的对象，那么您可以设置用于捕获视频的计时器 -

videoPickerController

iPhone：基于计时器的视频录制？

2 个答案: