iphone - 从 uiimagepickercontroller 选择视频文件时应用程序崩溃

Question

在我的应用程序中，我想使用 UIImagePickerController 从库中选择视频。但是当我选择持续时间超过 5 分钟的视频时，我的应用程序在 ipod 上崩溃了。我如何限制用户选择持续时间超过 5 分钟的视频。请给我这个错误的解决方案。谢谢你。

Answer 1

试试这个：

NSURL * aUrlMovie = [[信息 valueForKey:UIImagePickerControllerMediaURL] 保留];/
 AVPlayerItem *playerItem = [AVPlayerItem playerItemWithURL:aURLPath];
CMTime 持续时间 = playerItem.duration;
浮点秒 = CMTimeGetSeconds(duration);

然后为您希望的秒数添加验证..

Answer 2

 #pragma mark UIImagePickerController delegate

  - (void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary*)info
  {
NSString* mediaType = [info objectForKey:UIImagePickerControllerMediaType];
if ( [mediaType isEqualToString:(NSString*)kUTTypeMovie] ) {
    self.mediaURL = [info objectForKey:UIImagePickerControllerMediaURL];
  if ( UIVideoAtPathIsCompatibleWithSavedPhotosAlbum( mediaPath ) ) {
        UISaveVideoAtPathToSavedPhotosAlbum( mediaPath,
                                            self,
                                            @selector(video:didFinishSavingWithError:contextInfo:),
                                            NULL );
    } 
} 
[self dismissModalViewControllerAnimated:YES];
}

Answer 3

试试这个picker.videoMaximumDuration = 5;

像这样的东西：

 #import <AVFoundation/AVFoundation.h>
 #import <AVFoundation/AVAsset.h>

 - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
   NSURL *selectedVideoUrl = [info objectForKey:UIImagePickerControllerMediaURL];

   AVPlayerItem *playerItem = [AVPlayerItem playerItemWithURL:selectedVideoUrl];

   CMTime duration = playerItem.duration;
  float seconds = CMTimeGetSeconds(duration);
  //NSLog(@"duration: %.2f", seconds);
  if(seconds > 300)
  {
     [picker popViewControllerAnimated:YES];
  }
  else{
  [picker dismissModalViewControllerAnimated:YES];
  }

}