出现压缩视频画面时处理 UIIMagePickerController答案

【问题标题】：Handling UIIMagePickerController when compressing video screen appears出现压缩视频画面时处理 UIIMagePickerController
【发布时间】：2012-11-29 09:49:33
【问题描述】：

我正在使用 UIImagePicker 从库中选择视频并尝试在我的应用程序中使用视频。为此，我正在使用这样的代码

picker = [[UIImagePickerController alloc] init];
picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;

picker.delegate = self;
picker.mediaTypes=[NSArray arrayWithObject:(NSString*)kUTTypeMovie];
[self presentModalViewController:picker animated:YES];

Now the problem is that when any video is selected it shows compressing video message alongwith a progress bar.Meanwhile If I send my app in background I want to cancel this compression and dismismodalviewController so that corrupted compression does not occur.Is there any避免这种压缩或处理这种压缩的方法是成功或失败。设置 videoQuality 并不能解决问题。

【问题讨论】：

标签： iphone objective-c background uiimagepickercontroller photo-gallery

【解决方案1】：

在我的例子中，来自 UIImagePickerControllerMediaType 的 URL 是 nil。解决方案是从UIImagePickerControllerReferenceURL获取视频网址：

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
            NSURL* url = [info objectForKey:UIImagePickerControllerReferenceURL];
            //... read video with ALAssetsLibrary
}

可以在此处找到有关如何阅读视频的更多信息：How to save video from assets url

【讨论】：