Make UIAlertView Button trigger function On Press

Question

Currently I am using the following code to present a UIAlertView:

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Today's Entry Complete"
                        message:@"Press OK to submit your data!" 
                       delegate:nil 
              cancelButtonTitle:@"OK" 
              otherButtonTitles: nil];
    [alert show];
    [alert release];

How do I get it so that when 'OK" is pressed, it triggers a function, say -(void)submitData

user_5370607 · Answer

From iOS8 Apple provide new UIAlertController class which you can use instead of UIAlertView which is now deprecated, its is also stated in depreciation message

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

So you should use something like this

Objective C

UIAlertController * alert = [UIAlertController
                alertControllerWithTitle:@"Title"
                                 message:@"Message"
                          preferredStyle:UIAlertControllerStyleAlert];

   UIAlertAction* yesButton = [UIAlertAction
                        actionWithTitle:@"Yes, please"
                                  style:UIAlertActionStyleDefault
                                handler:^(UIAlertAction * action) {
                                    //Handle your yes please button action here
                                }];

   UIAlertAction* noButton = [UIAlertAction
                            actionWithTitle:@"No, thanks"
                                      style:UIAlertActionStyleDefault
                                    handler:^(UIAlertAction * action) {
                                       //Handle no, thanks button                
                                    }];

   [alert addAction:yesButton];
   [alert addAction:noButton];

   [self presentViewController:alert animated:YES completion:nil];

Swift

The Swifty way is to use the new UIAlertController and closures:

    // Create the alert controller
    let alertController = UIAlertController(title: "Title", message: "Message", preferredStyle: .Alert)

    // Create the actions
    let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default) {
        UIAlertAction in
        NSLog("OK Pressed")
    }
    let cancelAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel) {
        UIAlertAction in
        NSLog("Cancel Pressed")
    }

    // Add the actions
    alertController.addAction(okAction)
    alertController.addAction(cancelAction)

    // Present the controller
    self.presentViewController(alertController, animated: true, completion: nil)

Make UIAlertView Button trigger function On Press

7 Answers