One Quickie

Displaying a UIAlert (UIAlert->General)
    UIAlertView *alert =
        [[UIAlertView alloc] initWithTitle: @"Some Title"
                             message: @"You look very nice today."
                             delegate: self
                             cancelButtonTitle: @"OK"
                             otherButtonTitles: nil];
    [alert show];
    [alert release];
If you want to know what got tapped, use a delegate method. The cancel button is index zero.
- (void) alertView: (UIAlertView *) alertView
    clickedButtonAtIndex: (NSInteger) buttonIndex {
    NSLog(@"foobage! %d", buttonIndex);
} // clickedButtonAtIndex

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Advanced Mac OS X Programming book