iOS：如何显示社交框架的完成结果

Question

我试图迅速在IOS中为Facebook使用社交框架。 我尝试了以下代码，但是无法显示警报窗口...

if SLComposeViewController.isAvailableForServiceType(SLServiceTypeFacebook){
        var mes: String = ""
        let shareWindow: SLComposeViewController = SLComposeViewController(forServiceType: SLServiceTypeFacebook)
        //configure initial text
        shareWindow.setInitialText("XXX")
        self.presentViewController(shareWindow, animated: true, completion: nil)
        //handle the result of this share
        shareWindow.completionHandler = { result -> Void in
            let getResult = result as SLComposeViewControllerResult;
            switch(getResult.rawValue) {
            case SLComposeViewControllerResult.Cancelled.rawValue:
                mes = "Cancelled!"
            case SLComposeViewControllerResult.Done.rawValue:
                mes = "Successfully Posted!"
            default:
                mes = ""
            }
            self.dismissViewControllerAnimated(true, completion: nil)
        }
        if mes.isEmpty == false {
            let alertView = UIAlertController(title: "Facebook Post Result", message: mes, preferredStyle: .Alert)
            alertView.addAction(UIAlertAction(title: "Ok", style: .Default, handler: nil))
            presentViewController(alertView, animated: true, completion: nil)
        }
    }

有人可以给我一个提示吗？ 非常感谢！

Answer 1

尝试在完成处理程序结束之后和IF之前移动self.presentViewController(shareWindow, animated: true, completion: nil) 。