iPhone4的视频捕获代码示例

大家好，有谁能帮我获取iPhone4的视频捕获代码吗

我正在使用以下代码，但它不起作用：

UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
NSArray *arraySourceTypes =[UIImagePickerController availableMediaTypesForSourceType:imagePicker.sourceType];  

if ([arraySourceTypes containsObject:(NSString *)kUTTypeMovie]){
    imagePicker.mediaTypes =  [NSArray arrayWithObject:(NSString *)kUTTypeMovie];
    imagePicker.cameraDevice=UIImagePickerControllerCameraDeviceRear;
    imagePicker.cameraCaptureMode=UIImagePickerControllerCameraCaptureModeVideo;
    imagePicker.videoQuality=UIImagePickerControllerQualityTypeHigh;
    imagePicker.delegate = self;
    [self presentModalViewController:imagePicker animated:YES];   
    [imagePicker release];       
}
else
    [imagePicker release];

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将UIImagePickerController与

cameraCaptureMode=UIImagePickerControllerCameraCaptureModeVideo

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阅读文档了解更多详细信息。

您能帮我提供一个示例代码吗？我也在使用上面的代码，它使pickerview在照相机模式下显示图片而不是视频。