快速警报视图（iOS8）与确定和取消button，哪个button点击

我在Swift中编写了一个警告视图，我想确定用户select了哪个button（这是一个确认对话框），什么都不做或者执行。 目前我有：

@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() } 

我可能使用错误的button，请纠正我，因为这对我来说都是新的。

谢谢！

Answer 1

如果您使用的是iOS8，则应该使用UIAlertController – 不build议使用UIAlertView。

这是一个如何使用它的例子：

 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) 

正如你可以看到button按下UIAlertAction句柄的块处理程序。 这里有一个很好的教程（虽然这个教程不是用swift编写的）： 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) 

Answer 2

 var refreshAlert = UIAlertController(title: "Log Out", message: "Are You Sure to Log Out ? ", preferredStyle: UIAlertControllerStyle.Alert) refreshAlert.addAction(UIAlertAction(title: "Confirm", style: .Default, handler: { (action: UIAlertAction!) in self.navigationController?.popToRootViewControllerAnimated(true) })) refreshAlert.addAction(UIAlertAction(title: "Cancel", style: .Default, handler: { (action: UIAlertAction!) in refreshAlert .dismissViewControllerAnimated(true, completion: nil) })) presentViewController(refreshAlert, animated: true, completion: nil) 

Answer 3

您可以使用UIAlertController轻松完成此操作

 let alertController = UIAlertController( title: "Your title", message: "Your message", preferredStyle: .alert) let defaultAction = UIAlertAction( title: "Close Alert", style: .default, handler: nil) //you can add custom actions as well alertController.addAction(defaultAction) present(alertController, animated: true, completion: nil) 

。

参考： iOS显示警报

Answer 4

更新为swift 3：

//function定义：

 @IBAction func showAlertDialog(_ sender: UIButton) { // Declare Alert let dialogMessage = UIAlertController(title: "Confirm", message: "Are you sure you want to Logout?", preferredStyle: .alert) // Create OK button with action handler let ok = UIAlertAction(title: "OK", style: .default, handler: { (action) -> Void in print("Ok button click...") self.logoutFun() }) // Create Cancel button with action handlder let cancel = UIAlertAction(title: "Cancel", style: .cancel) { (action) -> Void in print("Cancel button click...") } //Add OK and Cancel button to dialog message dialogMessage.addAction(ok) dialogMessage.addAction(cancel) // Present dialog message to user self.present(dialogMessage, animated: true, completion: nil) } 

// logoutFun（）函数definaiton：

 func logoutFun() { print("Logout Successfully...!") }