如何通过iOS中的UIActivityViewController导出PHAsset视频 [英] How to export PHAsset video by UIActivityViewController in iOS

问题描述

我尝试在iOS中通过 UIActivityViewController 导出 PHAsset 视频。
当PHAsset是图像时它工作正常。问题是当 PHAsset 是视频时。
我有以下代码导出 PHAsset 视频，但没有附加任何内容。

I tried to export PHAsset Video by UIActivityViewController in iOS. It worked fine when PHAsset was image. The problem was when PHAsset was video. I had the following code to export PHAsset video, but nothing was attached.

    var asset = getCurrentAsset() as PHAsset?

    if asset == nil {
        return
    }

    if asset?.mediaType == PHAssetMediaType.Video {

        PHImageManager.defaultManager().requestAVAssetForVideo(asset, options: nil) { (avAsset:AVAsset!, audioMix:AVAudioMix!, info:[NSObject : AnyObject]!) -> Void in
            var videoURL = avAsset as AVURLAsset
            var activityVC = UIActivityViewController(activityItems: [videoURL], applicationActivities: nil)
            activityVC.completionHandler = {(str: String!, value: Bool) -> Void in
            }
            self.presentViewController(activityVC, animated: true, completion: nil)
        }

    } 

请帮我解决如何导出 PHAsset 视频。

Please help me how to export PHAsset video.

推荐答案

我浪费了很多时间来做这件事。

I have wasted a lot of time to do that.

最后我通过将视频保存到文档目录，并使用文档目录中的文件URL。

Finally I resolved it by saving the video to document directory, and using the file url from document directory.

typeof(self) __weak weakSelf = self;

[[PHImageManager defaultManager] requestExportSessionForVideo: self.videosAssets[index] options:nil exportPreset:AVAssetExportPresetPassthrough resultHandler:^(AVAssetExportSession *exportSession, NSDictionary *info) {

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString* videoPath = [documentsDirectory stringByAppendingPathComponent:@"tempSelvi.MOV"];
    NSFileManager *manager = [NSFileManager defaultManager];

    NSError *error;
    if ([manager fileExistsAtPath:videoPath]) {
        BOOL success = [manager removeItemAtPath:videoPath error:&error];
        if (success) {
            NSLog(@"Already exist. Removed!");
        }
    }

    NSURL *outputURL = [NSURL fileURLWithPath:videoPath];
    NSLog(@"Final path %@",outputURL);
    exportSession.outputFileType=AVFileTypeQuickTimeMovie;
    exportSession.outputURL=outputURL;

    [exportSession exportAsynchronouslyWithCompletionHandler:^{
        if (exportSession.status == AVAssetExportSessionStatusFailed) {
            NSLog(@"failed");
        } else if(exportSession.status == AVAssetExportSessionStatusCompleted){
            NSLog(@"completed!");
            dispatch_async(dispatch_get_main_queue(), ^(void) {
                NSArray *activityItems = [NSArray arrayWithObjects:outputURL, nil];

                UIActivityViewController *activityViewController = [[UIActivityViewController alloc] initWithActivityItems:activityItems applicationActivities:nil];
                activityViewController.completionWithItemsHandler = ^(NSString *activityType, BOOL completed, NSArray *returnedItems, NSError *activityError) {
                    NSError *error;
                    if ([manager fileExistsAtPath:videoPath]) {
                        BOOL success = [manager removeItemAtPath:videoPath error:&error];
                        if (success) {
                            NSLog(@"Successfully removed temp video!");
                        }
                    }
                    [weakSelf dismissViewControllerAnimated:YES completion:nil];
                };
                [weakSelf presentViewController:activityViewController animated:YES completion:nil];
            });     
        }
    }];
}];

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