Ios 通过点击外部关闭UIAlertViewController

我想通过点击UIAlertViewController的外部，点击黑屏空间来关闭我的UIAlertViewController。我试过这个：

self.presentViewController(alertViewController, animated: true, completion:{
        alertViewController.view.superview?.userInteractionEnabled = true
        alertViewController.view.superview?.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(self.alertClose(_:))))
    })

但如果我点击UIAlertViewController，它就会关闭。但我想在外面，半黑的屏幕敲打着

可能吗

更新

@IBAction func shareButtonTapped(sender: UIButton) {
    let alertViewController = UIAlertController(title: "Share on social networks", message: "Where do you want to share?", preferredStyle: .ActionSheet)

    let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: "dismissAlertView:")
    self.view.addGestureRecognizer(tapGestureRecognizer)

    let facebookAction = UIAlertAction(title: "Facebook", style: .Default) { (alert: UIAlertAction) -> Void in

    }

    let twitterAction = UIAlertAction(title: "Twitter", style: .Default) { (alert: UIAlertAction) -> Void in

    }

    let cancelAction = UIAlertAction(title: "Cancel", style: .Destructive) { (alert: UIAlertAction) -> Void in

    }

    alertViewController.addAction(facebookAction)
    alertViewController.addAction(twitterAction)
    alertViewController.addAction(cancelAction)

    self.presentViewController(alertViewController, animated: true, completion:{
        alertViewController.view.superview?.userInteractionEnabled = true
        alertViewController.view.superview?.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(self.alertClose(_:))))
    })
}

警报关闭功能：

func alertClose(gesture: UITapGestureRecognizer) {
    self.dismissViewControllerAnimated(true, completion: nil)
}

尝试将

uitappesturerecognizer

添加到

UIWindow

类中

view.window.addgestureerecognizer（）

实施UIgestureRecognitizerDelegate方法

应接收触摸屏

并检查您的视图

---

希望此帮助

如果您使用的是ActionSheet样式，则无需执行此操作。因为当你们点击半黑屏幕时，视图控制器会自动被解除

但如果要与警报样式一起使用，请执行以下操作（不带：alertViewController.view.superview？.userInteractionEnabled=true）：

---

发布你的

alertClose

函数。我猜你是指UIAlertController？您可能需要将UIAlertController子类化，将GestureRecognizer委托设置为self，这样您就可以重写shouldReceiveTouchs:。这样，当触摸在主窗口上时，您可以返回false。这会给你想要的效果。@代码完成！我已经添加了我的代码的其他部分，已经用答案@mitulmarsonia提问，这些答案对我没有帮助=/

        self.presentViewController(alertViewController, animated: true, completion: {

            let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(self.alertClose(_:)))
            alertViewController?.view.superview?.addGestureRecognizer(tapGestureRecognizer)


        })