小编use*_*208的帖子

我试图使用UIActivityViewController以下代码从MonoTouch 访问:

var textToShare = new NSString("hallo there");
var activityItems = new NSObject[] {textToShare};
var excludedActivityTypes = new NSString[] { new NSString("UIActivityTypePostToWeibo"),       new NSString("UIActivityTypeMessage") };
var activityViewController = new UIActivityViewController(activityItems, null);
activityViewController.ExcludedActivityTypes = excludedActivityTypes;
this.PresentViewController(activityViewController, true, null)

将显示iOS操作表,但不排除指定的活动.有什么建议问题是什么？有没有MonoTouch样品？