UIActivityViewController仅显示消息和邮件

Question

我调用UIActivityViewController：

        var text = "Test Image"
        var actItems = [text, appDelegate.image!]

        var activityVc: UIActivityViewController = UIActivityViewController(activityItems: actItems, applicationActivities: nil)
        activityVc.excludedActivityTypes = [UIActivityTypePrint, UIActivityTypeSaveToCameraRoll, UIActivityTypeCopyToPasteboard, UIActivityTypeAssignToContact, UIActivityTypeAirDrop]
        self.presentViewController(activityVc, animated: true, completion: nil)

我在网上看到facebook等缺失的原因是因为我没有登录。但是我登录了我的facebook帐户，也是Whatsapp帐户。