Objective-c action before closing the window

Question

How can i assign an action for close button in my window in objective-c? For example, user clicks on close button and then program asks: "Do you really want to close the window?"

Answer 1

If you want to add message before closing view in Application you need to implement UIAlertView in it, don't forget to add < UIAlertViewDelegate> in .h file

code in action button pressed;

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Message" 
                                                message:@"Do you really want to close the window?" 
                                                delegate:self 
                                                cancelButtonTitle:@"OK" 
                                                otherButtonTitles:nil];
[alert show];

If you want to do something when the button is clicked, implement this delegate method:

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {
        // the user clicked OK
        if (buttonIndex == 0) {
            // Write Close Code here.....

   }
}