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

Answer 1

NOTE:

Important: UIAlertView is deprecated in iOS 8. (Note that UIAlertViewDelegate is also deprecated.) To create and manage alerts in iOS 8 and later, instead use UIAlertController with a preferredStyle of UIAlertControllerStyleAlert.

Please check this out tutorial

“deprecated” means???

Objectvie C

.h file

    @interface urViewController : UIViewController <UIAlertViewDelegate> {

.m file

// Create Alert and set the delegate to listen events
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Today's Entry Complete"
                                                message:@"Press OK to submit your data!"
                                               delegate:self
                                      cancelButtonTitle:nil
                                      otherButtonTitles:@"OK", nil];

// Set the tag to alert unique among the other alerts.
// So that you can find out later, which alert we are handling
alert.tag = 100;

[alert show];


//[alert release];


-(void) alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{


    // Is this my Alert View?
    if (alertView.tag == 100) {
        //Yes


    // You need to compare 'buttonIndex' & 0 to other value(1,2,3) if u have more buttons.
    // Then u can check which button was pressed.
        if (buttonIndex == 0) {// 1st Other Button

            [self submitData];

        }
        else if (buttonIndex == 1) {// 2nd Other Button


        }

    }
    else {
     //No
        // Other Alert View

    }

}

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)