What's UIBarButtonItem's possibleTitles for?

Question

In UIKit, UIBarButtonItem has a property called possibleTitles. How is that being used?

Answer 1

I wrote a little code to test this out and it's like Ed says, the button will be as wide as it needs to be to fit the longest string in the NSSet given to possibleTitles

UIBarButtonItem *myButton = [[UIBarButtonItem alloc] initWithTitle:@"Bye"
            style:UIBarButtonItemStyleBordered
            target:self
            action:@selector(sayGoodnight)];
myButton.possibleTitles = [NSSet setWithObjects:@"So Long", @"Farewell", @"Auf Wiedersen, Good Night", nil];
[self setToolbarItems:[NSArray arrayWithObjects:myButton, nil] animated:NO];
[myButton release];

The button is set wide enough to fit "Auf Wiedersen, Good Night".