Question

I have this 2-button alert view:

UIAlertView* message = [[UIAlertView alloc]
                           initWithTitle: @"Delete?" message: @"This business will be deleted permenently." delegate: nil
                           cancelButtonTitle: @"Cancel" otherButtonTitles: @"Delete", nil];

[message show];

I also have this method:

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    NSString *title = [alertView buttonTitleAtIndex:buttonIndex];
    if([title isEqualToString:@"Delete"])
    {
        NSLog(@"Button DELETE was selected.");
    }
    else if([title isEqualToString:@"Cancel"])
    {
        NSLog(@"Button CANCEL was selected.");
    }
}

and I added this to the .h file:

<UIAlertViewDelegate>

Right now when either button is pressed, it just closes the dialog. That is ok for cancel, but how do I know when the delete button is pressed?

Thanks!

Answer 1

You have to implement the – alertView:clickedButtonAtIndex: method of the UIAlertViewDelegate. You also have to set the delegate when initialising the alert view.

E.g.

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

   if (buttonIndex == 0) {
        //Do something
   } else if (buttonIndex == 1) {
       //Do something else
   }
}

The cancel button’s index is 0.