The use of the Swift-Alarm prompt box (uialertcontroller)

Since IOS8, Apple has advised the warning box to use Uialertcontroller instead of Uialertview. Here's a summary of some common uses:

1, simple Application (simultaneous button response handler using closure function)

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import UIKitclass ViewController: UIViewController ,UIActionSheetDelegate {    override func viewDidLoad() {        super.viewDidLoad()    }        override func viewDidAppear(animated: Bool){        super.viewDidAppear(animated)                let alertController = UIAlertController(title: "系统提示",            message: "您确定要离开hangge.com吗？", preferredStyle: UIAlertControllerStyle.Alert)        let cancelAction = UIAlertAction(title: "取消", style: UIAlertActionStyle.Cancel, handler: nil)        let okAction = UIAlertAction(title: "好的", style: UIAlertActionStyle.Default,            handler: {                action in                print("点击了确定")        })        alertController.addAction(cancelAction)        alertController.addAction(okAction)        self.presentViewController(alertController, animated: true, completion: nil)    }        override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()        // Dispose of any resources that can be recreated.    }}

2, in addition to pop-up, you can also use the style to slide up from the bottom
(Note: If there is a "cancel" button in the pull-down menu, it will always appear at the bottom of the menu, regardless of the order in which it was added)

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var alertController = UIAlertController(title: "保存或删除数据", message: "删除数据将不可恢复",    preferredStyle: UIAlertControllerStyle.ActionSheet)var cancelAction = UIAlertAction(title: "取消", style: UIAlertActionStyle.Cancel, handler: nil)var deleteAction = UIAlertAction(title: "删除", style: UIAlertActionStyle.Destructive, handler: nil)var archiveAction = UIAlertAction(title: "保存", style: UIAlertActionStyle.Default, handler: nil)alertController.addAction(cancelAction)alertController.addAction(deleteAction)alertController.addAction(archiveAction)self.presentViewController(alertController, animated: true, completion: nil)

3, button using "alarm" style (text color red, used to alert users)

1	varokAction = UIAlertAction(title: "好的", style: UIAlertActionStyle.Destructive, handler: nil)

4, add any number of text input boxes (such as can be used to implement a landing box)

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import UIKitclass ViewController: UIViewController ,UIActionSheetDelegate {    override func viewDidLoad() {        super.viewDidLoad()    }        override func viewDidAppear(animated: Bool){        super.viewDidAppear(animated)                 let alertController = UIAlertController(title: "系统登录",            message: "请输入用户名和密码", preferredStyle: UIAlertControllerStyle.Alert)        alertController.addTextFieldWithConfigurationHandler {            (textField: UITextField!) -> Void in            textField.placeholder = "用户名"        }        alertController.addTextFieldWithConfigurationHandler {            (textField: UITextField!) -> Void in            textField.placeholder = "密码"            textField.secureTextEntry = true        }        let cancelAction = UIAlertAction(title: "取消", style: UIAlertActionStyle.Cancel, handler: nil)        let okAction = UIAlertAction(title: "好的", style: UIAlertActionStyle.Default,            handler: {                action in                let login = alertController.textFields!.first! as UITextField                let password = alertController.textFields!.last! as UITextField                print("用户名：\(login.text) 密码：\(password.text)")        })        alertController.addAction(cancelAction)        alertController.addAction(okAction)        self.presentViewController(alertController, animated: true, completion: nil)    }        override func didReceiveMemoryWarning() {        super.didReceiveMemoryWarning()    }}

5. Remove the cue box with code

1	self.presentedViewController?.dismissViewControllerAnimated(false, completion: nil)

The use of the Swift-Alarm prompt box (uialertcontroller)