如何在Swift（iOS 7）中向UIAlertView添加操作
我想在重试按钮中添加一个动作，但是当用户按下重试按钮时没有任何反应。
var createAccountErrorAlert: UIAlertView = UIAlertView() createAccountErrorAlert.delegate = self createAccountErrorAlert.title = "Oops" createAccountErrorAlert.message = "Could not create account!" createAccountErrorAlert.addButtonWithTitle("Dismiss") createAccountErrorAlert.addButtonWithTitle("Retry") createAccountErrorAlert.show() 确定按下索引的function？
func alertView(View: UIAlertView!, clickedButtonAtIndex buttonIndex: Int){ switch buttonIndex{ case 1: createAccount() default: //Some code here.. } }
我测试了你的代码，它对我来说很好，它打印相应的结果：
func showAlert(){ var createAccountErrorAlert: UIAlertView = UIAlertView() createAccountErrorAlert.delegate = self createAccountErrorAlert.title = "Oops" createAccountErrorAlert.message = "Could not create account!" createAccountErrorAlert.addButtonWithTitle("Dismiss") createAccountErrorAlert.addButtonWithTitle("Retry") createAccountErrorAlert.show() } func alertView(View: UIAlertView!, clickedButtonAtIndex buttonIndex: Int){ switch buttonIndex{ case 1: NSLog("Retry"); break; case 0: NSLog("Dismiss"); break; default: NSLog("Default"); break; //Some code here.. } }
当我点击关闭按钮时打印关闭。
这是因为重试按钮的索引是1而不是0.解雇按钮的索引为0。
如果将以下代码放在操场中，您将实际看到按钮的索引（如addButtonWithTitle方法中所述）：
var createAccountErrorAlert: UIAlertView = UIAlertView() createAccountErrorAlert.title = "Oops" createAccountErrorAlert.message = "Could not create account!" createAccountErrorAlert.addButtonWithTitle("Dismiss") //Prints 0 createAccountErrorAlert.addButtonWithTitle("Retry") //Prints 1
索引错了。 以下（基于iOS单视图默认应用程序模板）适用于我（我连接按钮以触发@IBAction buttonPressed ）。 不要忘记让您的视图控制器成为UIAlertViewDelegate （虽然以下工作没有这样做）：
import UIKit class ViewController: UIViewController, UIAlertViewDelegate { override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } @IBAction func buttonPressed(sender : AnyObject) { var createAccountErrorAlert: UIAlertView = UIAlertView() createAccountErrorAlert.delegate = self createAccountErrorAlert.title = "Oops" createAccountErrorAlert.message = "Could not create account!" createAccountErrorAlert.addButtonWithTitle("Dismiss") createAccountErrorAlert.addButtonWithTitle("Retry") createAccountErrorAlert.show() } func alertView(View: UIAlertView!, clickedButtonAtIndex buttonIndex: Int) { switch buttonIndex { default: println("alertView \(buttonIndex) clicked") } } }
继续我的方式，使用较短的代码行：
func showAlert(){ var alert = UIAlertView(title: "Choose", message: "Which_pill", delegate: self, cancelButtonTitle:"Red") alert.addButtonWithTitle("Blue") alert.show() } func alertView(View: UIAlertView!, clickedButtonAtIndex buttonIndex: Int){ switch buttonIndex{ case 1: println("Blue") case 0: println("Red") default: println("Is this part even possible?") } }