通过 URL 获取保存到相册的视频信息答案

【问题标题】：Get information of the video saved to photos album by URL通过 URL 获取保存到相册的视频信息
【发布时间】：2016-06-16 09:07:09
【问题描述】：

我正在使用writeVideoAtPathToSavedPhotosAlbum 保存从AVCaptureVideoDataOutput 和AVAsset 获得的视频，如下所示。

    NSString* filename = [NSString stringWithFormat:@"capture%d.mp4", _currentFile];
    NSString* path = [NSTemporaryDirectory() stringByAppendingPathComponent:filename];
    NSURL* url = [NSURL fileURLWithPath:path];

    dispatch_async(dispatch_get_main_queue(), ^{
        [_encoder finishWithCompletionHandler:^{
            ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
            [library writeVideoAtPathToSavedPhotosAlbum:url completionBlock:^(NSURL *assetURL, NSError *error){
                NSLog(@"save completed");
            }];
        }];
    });

但是，在保存视频后，我希望像使用 UIImagePickerController 时一样获取“已保存的视频信息”。

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    [picker dismissViewControllerAnimated:YES completion:NULL];

    NSLog(@"there");

    // Handle a movie capture
    NSString *type = info[UIImagePickerControllerMediaType];
    NSURL *videoURL = info[UIImagePickerControllerMediaURL];

    //do things with that info
}

【问题讨论】：

标签： ios objective-c avfoundation avasset

【解决方案1】：

这是保存视频并将该视频添加到自定义相册中的代码，然后告知其保存位置。

 [library writeVideoAtPathToSavedPhotosAlbum:videoInputUrl completionBlock:^(NSURL *assetURL, NSError *error){
    if (error) {

        NSLog(@"Video could not be saved");
    }
    else{

            [library assetForURL:assetURL
                     resultBlock:^(ALAsset *asset) {
                         // assign the photo to the album
                         [groupToAddTo addAsset:asset];
                         NSLog(@"Added Successfully %@ to %@", [[asset defaultRepresentation] filename], albumName);
                         UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Success" message:@"Video Saved to xyz Album."  delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles: nil, nil];
                         [alert show];
                     }
                    failureBlock:^(NSError* error) {
                        NSLog(@"failed to retrieve image asset:\nError: %@ ", [error localizedDescription]);
                    }];
    }
}];

希望对您有所帮助...:)

【讨论】：