UIAlertView not working in Swift

Question

when I run this code in swift, I don't know why the application crashes by showing a breakpoint in the alertView.show () part. Someone please help me.

var alertView = UIAlertView( title: "Hey", message: "Hello", delegate: self, cancelButtonTitle: "Cancel" ) alertView.show() 

Answer 1

From Xcode 6.0 UIAlertView Class:

UIAlertView is deprecated. Use a UIAlertController with a preferredStyle instead of a UIAlertControllerStyleAlert.

In fast (iOS 8 and OS X 10.10) you can do this:

 var alert = UIAlertController(title: "Alert Title", message: "Alert Message", preferredStyle: UIAlertControllerStyle.Alert) alert.addAction(UIAlertAction(title: "Close", style: UIAlertActionStyle.Cancel, handler:handleCancel)) alert.addAction(UIAlertAction(title: "Ok", style: UIAlertActionStyle.Default, handler:{ (ACTION :UIAlertAction!)in println("User click Ok button") })) self.presentViewController(alert, animated: true, completion: nil) func handleCancel(alertView: UIAlertAction!) { println("User click cancel button") } 

If you want to use in "ActionSheet" instead of "Alert", you only need to change the UIAlertControllerStyle, for example:

 var alert = UIAlertController(title: "Alert Title", message: "Alert Message", preferredStyle: UIAlertControllerStyle.ActionSheet) 

Answer 2

UIAlertView is deprecated in iOS 8, but Swift supports iOS7, and you cannot use UIAlertController on iOS 7. Add the following method to solve the problem:

 func showAlert(title:NSString, message:NSString,owner:UIViewController) { if let gotModernAlert: AnyClass = NSClassFromString("UIAlertController") { var alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.Alert) alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil)) owner.presentViewController(alert, animated: true, completion: nil) } else { let alertView = UIAlertView(title: title, message: message, delegate: self, cancelButtonTitle: "Cancel", otherButtonTitles: "OK") alertView.alertViewStyle = .Default alertView.show() } } 

and call the method somewhere from the code as follows:

 showAlert(APP_NAME,message: "Add your alert message here" ,owner: self) 

Answer 3

the best way for me is ...

 class ViewController: UIViewController, UIAlertViewDelegate { var allarme = UIAlertView(title: "Warning", message: "This is a best way to create a alarm message", delegate: self, cancelButtonTitle: "OK") allarme.show() 

don't forget to import into the UIAlertViewDelegate class

Answer 4

Use the following method:

 var altMessage = UIAlertController(title: "Warning", message: "This is Alert Message", preferredStyle: UIAlertControllerStyle.Alert) altMessage.addAction(UIAlertAction(title: "Done", style: UIAlertActionStyle.Default, handler: nil)) self.presentViewController(altMessage, animated: true, completion: nil)