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I am calling the -(void)setEditing:(BOOL)editing animated:(BOOL)animated method in my code to swap between two buttons on the RHS of my navigation bar. -(void)setEditing:(BOOL)editing animated:(BOOL)animated { [super setEditing:editing animated:animated]; // Toggle ‘+’ and ‘Add To Order’ button. if( editing ) { self.navigationItem.rightBarButtonItem = self.addItemButton; } else { self.navigationItem.rightBarButtonItem = self.addToOrderButton; } } Where self.addItemButton and self.addToOrderButton are ivars containing predefined UIBarButtonItems, setup in awakefromNib . The button in self.addToOrderButton is significantly wider then the one in self.addItemButton , so I’d like their to be a subtle animation between the two widths when the change in editing state is triggered (by tapping a standard editButtonItem on the LHS of the navigation. If I surround the whole if:else with [UIView beginAnimations:nil context:NULL]; and [UIView commitAnimations]; the button change does animate, but with their positions—flying into place individually from the top left—rather than in place and just animating their widths. How I animate the navigation bar elements so that each individual one (the RHS button, the title) animate in more appropriate, restrained ways?

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