带有“确定”和“取消”的快速警报视图：轻按了哪个按钮？ [英] Swift alert view with OK and Cancel: which button tapped?

问题描述

我有一个用Swift编写的Xcode警报视图，我想确定用户选择了哪个按钮（这是一个确认对话框），不执行任何操作或执行某些操作。

I have an alert view in Xcode written in Swift and I'd like to determine which button the user selected (it is a confirmation dialog) to do nothing or to execute something.

当前我有：

@IBAction func pushedRefresh(sender: AnyObject) {
    var refreshAlert = UIAlertView()
    refreshAlert.title = "Refresh?"
    refreshAlert.message = "All data will be lost."
    refreshAlert.addButtonWithTitle("Cancel")
    refreshAlert.addButtonWithTitle("OK")
    refreshAlert.show()
}

我可能使用了错误的按钮，请纠正我，因为这对我来说是全新的。

I'm probably using the buttons wrong, please do correct me since this is all new for me.

推荐答案

如果您使用的是iOS8，则应该使用UIAlertController-UIAlertView是已弃用。

If you are using iOS8, you should be using UIAlertController — UIAlertView is deprecated.

以下是使用它的示例：

var refreshAlert = UIAlertController(title: "Refresh", message: "All data will be lost.", preferredStyle: UIAlertControllerStyle.Alert)

refreshAlert.addAction(UIAlertAction(title: "Ok", style: .Default, handler: { (action: UIAlertAction!) in
  print("Handle Ok logic here")
  }))

refreshAlert.addAction(UIAlertAction(title: "Cancel", style: .Cancel, handler: { (action: UIAlertAction!) in
  print("Handle Cancel Logic here")
  }))

presentViewController(refreshAlert, animated: true, completion: nil)

如您所见，UIAlertAction的块处理程序处理了按钮的按下。这里有个很棒的教程（尽管本教程不是使用swift编写的）：
http：/ /hayageek.com/uialertcontroller-example-ios/

As you can see the block handlers for the UIAlertAction handle the button presses. A great tutorial is here (although this tutorial is not written using swift): http://hayageek.com/uialertcontroller-example-ios/

Swift 3更新：

let refreshAlert = UIAlertController(title: "Refresh", message: "All data will be lost.", preferredStyle: UIAlertControllerStyle.alert)

refreshAlert.addAction(UIAlertAction(title: "Ok", style: .default, handler: { (action: UIAlertAction!) in
    print("Handle Ok logic here")
}))

refreshAlert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: { (action: UIAlertAction!) in
    print("Handle Cancel Logic here")
}))

present(refreshAlert, animated: true, completion: nil)

迅速5更新：

let refreshAlert = UIAlertController(title: "Refresh", message: "All data will be lost.", preferredStyle: UIAlertControllerStyle.alert)

refreshAlert.addAction(UIAlertAction(title: "Ok", style: .default, handler: { (action: UIAlertAction!) in
      print("Handle Ok logic here")
}))

refreshAlert.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: { (action: UIAlertAction!) in
      print("Handle Cancel Logic here")
}))

present(refreshAlert, animated: true, completion: nil)

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