UISaveVideoAtPathToSavedPhotosAlbum 崩溃
我有一个处于视频模式的 UIImagePickerController；完成录制视频并点击“使用”按钮接受视频后，我使用此方法 -(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 在其中我想将视频保存在相机胶卷中并从视频中检索第一帧以在 UIImageView 中显示它。我使用的代码如下：
NSString *tempFilePath = [[info objectForKey:UIImagePickerControllerMediaURL] path];
NSURL *url = [NSURL fileURLWithPath:tempFilePath];
MPMoviePlayerController *moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:url];
moviePlayer.shouldAutoplay = NO;
imageView.image = [moviePlayer thumbnailImageAtTime:0.0 timeOption:MPMovieTimeOptionNearestKeyFrame];
问题是，如果我添加方法 UISaveVideoAtPathToSavedPhotosAlbum 应用程序崩溃。
UISaveVideoAtPathToSavedPhotosAlbum(tempFilePath, self, @selector(video:didFinishSavingWithError:contextInfo:), nil);
其中 tmpFilePath 与我上面使用的相同。
相反，如果我仅使用此操作之一（UISaveVideoAtPathToSavedPhotosAlbum 或检索帧），则一切正常！
控制台报这个错误：
由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：“+[NSInitation invocateWithMethodSignature:]：方法签名参数不能为 nil”
有什么想法吗？谢谢...
I've a UIImagePickerController in video mode; after I finish recording video and I tap on "Use" button to accept the video I use this method -(void)imagePickerController:(UIImagePickerController *)picker and inside it i want save the video in camera roll and retrieve the first frame from the video to show it in UIImageView. The code that I use is the following:
didFinishPickingMediaWithInfo:(NSDictionary *)info
NSString *tempFilePath = [[info objectForKey:UIImagePickerControllerMediaURL] path];
NSURL *url = [NSURL fileURLWithPath:tempFilePath];
MPMoviePlayerController *moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:url];
moviePlayer.shouldAutoplay = NO;
imageView.image = [moviePlayer thumbnailImageAtTime:0.0 timeOption:MPMovieTimeOptionNearestKeyFrame];
The problem is that if I add the method UISaveVideoAtPathToSavedPhotosAlbum the app crash.
UISaveVideoAtPathToSavedPhotosAlbum(tempFilePath, self, @selector(video:didFinishSavingWithError:contextInfo:), nil);
where tmpFilePath is the same that I used above.
Instead if I use only one of this operation (UISaveVideoAtPathToSavedPhotosAlbum or retrieve frame) all work fine !
The console report this error:
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+[NSInvocation invocationWithMethodSignature:]: method signature argument cannot be nil'
Any ideas ? Thanks...
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在你的课堂上，你是否实现了以下方法？
In your class, do you implement the following method?