Using UIAlertView

NOTE UIAlertView has been deprecated since iOS 8. Use Using UIAlertController instead.

Step 1: Create the UIAlertView

Create and show the alertView as below. Title, message, delegate, cancelButtonTitle, otherButtonTitles are all optional.

var alertView = UIAlertView(title: "Title", message: "Message", delegate: self, cancelButtonTitle: "OK", otherButtonTitles: "Option 1", "Option 2")
alertView.show()

If you don't have any otherButtonTitles, you should omit the parameter, as below.

var alertView = UIAlertView(title: "Title", message: "Message", delegate: self, cancelButtonTitle: "OK")
alertView.show()

Step 2: Determining which button was tapped

Set your view controller to be a UIAlertViewDelegate

class MyViewController: UIViewController, UIAlertViewDelegate {
	...
}

Implement the UIAlertView event method, as shown below.

func alertView(alertView: UIAlertView!, clickedButtonAtIndex buttonIndex: Int) {
	// buttonIndex is 0 for Cancel
	// buttonIndex ranges from 1-n for the other buttons.	
}

Other Tasks

Dismissing the UIAlertView

Sometimes, you may want to dismiss an alert view programatically before a user dismisses it by tapping a button.

alertView.dismissWithClickedButtonIndex(0, animated: true)