Iphone 在Facebook上共享YouTube链接

我想在

Facebook

中与

UIActivityViewController

共享

YouTube

视频

因此，我创建了

UIActivityViewController

：

UIActivityViewController *activityViewController = [[UIActivityViewController alloc] 
initWithActivityItems:activityItems applicationActivities:applicationActivities];

YouTubeAppDelegate *md = (YouTubeAppDelegate*)[[UIApplication sharedApplication] delegate];
[self presentViewController:activityViewController animated:YES completion:^{}];

我把YouTube的链接添加到这里

但当我按下

UIActivityViewController

中的

Facebook

按钮时，它会将其作为文本发布在

Facebook

中，而不是嵌入视频播放器中。 你知道我该怎么修吗

NSArray * activityItems = @[[NSString stringWithFormat:@"Some initial text."], [NSURL URLWithString:@"http://www.youtube.com/watch?v=yyEWkJgdftE"]];
    NSArray * applicationActivities = nil;
    NSArray * excludeActivities = @[UIActivityTypeAssignToContact, UIActivityTypeCopyToPasteboard, UIActivityTypePostToWeibo, UIActivityTypePrint, UIActivityTypeMessage];

    UIActivityViewController * activityController = [[UIActivityViewController alloc] initWithActivityItems:activityItems applicationActivities:applicationActivities];
    activityController.excludedActivityTypes = excludeActivities;

    [self presentViewController:activityController animated:YES completion:nil];

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我想从网站上分享UIActivityViewController@MTA：为了更好地理解，请将代码粘贴到此处。我想从UIActivityViewController@MTA：为了更好地理解，你能把代码粘贴在这里吗