自iOS8起，苹果就建议告警框使用UIAlertController来代替UIAlertView。下面总结了一些常见的用法：
1，简单的应用（同时按钮响应Handler使用闭包函数） 
| 12345678910111213141516171819202122232425262728 | import UIKit class 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，除了弹出，还可以使用从底部向上滑出的样式
（注意：如果上拉菜单中有“取消”按钮的话，那么它永远都会出现在菜单的底部，不管添加的次序是如何）
| 123456789 | 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，按钮使用“告警”样式（文字颜色变红，用来来警示用户）
| 1 | var okAction = UIAlertAction(title: "好的", style: UIAlertActionStyle.Destructive, handler: nil) |
4，添加任意数量文本输入框（比如可以用来实现个登陆框）
| 1234567891011121314151617181920212223242526272829303132333435363738 | import UIKit class 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，使用代码移除提示框
| 1 | self.presentedViewController?.dismissViewControllerAnimated(false, completion: nil) |
