ios - 如何在 UIAlertController 外部点击时关闭 UIAlertController？

Question

如何在 UIAlertController 外部点击时关闭 UIAlertController？

我可以添加 UIAlertActionStyleCancel 样式的 UIAlertAction 来关闭 UIAlertController。

但我想添加这样的功能，当用户点击 UIAlertController 外部时，UIAlertController 将关闭。怎么做？谢谢。

Answer 1

如果您的目标设备是 iOS > 9.3 并且使用 Swift 且 preferredStyle 是Alert，您可以使用如下代码片段:

func showAlertBtnClicked(sender: UIButton) {
    let alert = UIAlertController(title: "This is title", message: "This is message", preferredStyle: .Alert)
    self.presentViewController(alert, animated: true, completion:{
        alert.view.superview?.userInteractionEnabled = true
        alert.view.superview?.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(self.alertControllerBackgroundTapped)))
    })
}

func alertControllerBackgroundTapped()
{
    self.dismissViewControllerAnimated(true, completion: nil)
}

使用 swift 3:

func showAlertBtnClicked(sender: UIButton) {
    let alert = UIAlertController(title: "This is title", message: "This is message", preferredStyle: .alert)
    self.present(alert, animated: true) {
        alert.view.superview?.isUserInteractionEnabled = true
        alert.view.superview?.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(self.alertControllerBackgroundTapped)))
    }
}

func alertControllerBackgroundTapped()
{
    self.dismiss(animated: true, completion: nil)
}