I am excluding .postToWeibo but still I can see Weibo in the options. My code is var activityViewController = UIActivityViewController(activityItems: [documentId+".pdf", pDfdata], applicationActivities: nil)   activityViewController.excludedActivityTypes = [.postToTwitter, .postToFacebook, .postToFlickr, .postToTencentWeibo, .postToVimeo, .postToWeibo] present(activityViewController, animated: true) Can you please let me know what is the reason for this?