How to add action to UIAlertView in Swift (iOS 7)

I tested your code and it is working fine for me it prints the respective result:

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..    }}

It print dismiss when i click on dismiss button.

That's because the index of your retry button is 1, not 0. The dismiss button has index 0.

If you put the following code in a playground, you will actually see the indexes of the buttons (as documented on the addButtonWithTitle method):

var createAccountErrorAlert: UIAlertView = UIAlertView()createAccountErrorAlert.title = "Oops"createAccountErrorAlert.message = "Could not create account!"createAccountErrorAlert.addButtonWithTitle("Dismiss") //Prints 0createAccountErrorAlert.addButtonWithTitle("Retry") //Prints 1

Index is wrong. The following (based on iOS single view default app template) works for me (where I wired a button to trigger @IBAction buttonPressed). Don't forget to make your view controller a UIAlertViewDelegate (though the following works without doing so):

import UIKitclass 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")        }    }}