ios - 使用 fb sdk 在 ios 上共享视频

Question

我是 iOS 编程的新手，因此，这个问题可能看起来很愚蠢，但我真的不知道哪里出了问题。

所以，我在 https://developers.facebook.com/docs/sharing/ios 上关注 iOS 中的分享。我成功地分享了链接和照片。但是我不知道为什么我不能分享视频。我没有使用 UIImagePickerControllerReferenceURL，而是使用 [[NSBundle mainBundle] URLForResource:@"xyz"withExtension:@"mp4"] 作为 videoURL.
这就是分享按钮不起作用的原因吗？

我的目标是让用户直接从应用分享内容。所以我不希望他们使用 UIImagePickerControllerReferenceURL。
这是代码:

NSURL* videoURL = [[NSBundle mainBundle] URLForResource:@"xyz" withExtension:@"mp4"];
FBSDKShareVideo *video = [[FBSDKShareVideo alloc] init];
video.videoURL = videoURL;
FBSDKShareVideoContent *content = [[FBSDKShareVideoContent alloc] init];
content.video = video;

FBSDKShareButton *button = [[FBSDKShareButton alloc] init];
button.center = self.view.center;
button.shareContent = content;
[self.view addSubview:button];

文件 xyz.mp4 位于媒体文件夹中。

Answer 1

NSURL* videoURL = [[NSBundle mainBundle] URLForResource:@"xyz" withExtension:@"mp4"];

替换成这个

NSURL* videoURL = [[NSBundle mainBundle] URLForResource:@"xyz" ofType:@"mp4"];

[self saveToPhotoAlbum:videoURL];

之后将此视频保存到照片库，作为 Facebook 所需的 Assets 库 url。

-(void)saveToPhotoAlbum:(NSURL*)url
{
NSLog(@"srcURL: %@", url);

    ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
    ALAssetsLibraryWriteVideoCompletionBlock videoWriteCompletionBlock =
    ^(NSURL *newURL, NSError *error) {
        if (error) {
            NSLog( @"Error writing image with metadata to Photo Library: %@", error );
        } else {
            NSLog( @"Wrote image with metadata to Photo Library %@", newURL.absoluteString);
            url_new  = newURL;
        }
    };

    if ([library videoAtPathIsCompatibleWithSavedPhotosAlbum:url])
    {
        [library writeVideoAtPathToSavedPhotosAlbum:url
                                    completionBlock:videoWriteCompletionBlock];
    }
}

然后

FBSDKShareDialog *shareDialog = [[FBSDKShareDialog alloc] init];    
NSURL *videoURL = url_new;
FBSDKShareVideo *video = [[FBSDKShareVideo alloc] init];
video.videoURL = videoURL;
FBSDKShareVideoContent *content = [[FBSDKShareVideoContent alloc] init];   
content.video = video;
shareDialog.shareContent = content;
shareDialog.delegate = self;
[shareDialog show];