UIBarButtonItemStyleDone background image using the iOS 5 appearance API

问题

How can I provide a visually distinct bar button item background image for bar buttons with the UIBarButtonItemStyleDone style and the editing state of the Edit/Done button? None of the documented UIControlState values in the UIBarButtonItem appearance proxy's setBackgroundImage:forState:barMetrics: seem to do the trick.

回答1:

I'm not sure why this was never answered but if you are still looking then simply create a property for a BarButtonItem in your .h, assign it in IB, then set the background property of that barButtonItem. Works fine for me and never "changes back to default appearance".

- (void)viewDidLoad
{
    [super viewDidLoad];

    [self.barButton setBackgroundImage:[UIImage imageNamed:@"YOURIMAGE"] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
}

回答2:

I have just found and posted a possible solution to this problem. You can 'inject' custom styles using a UIBarButtonItem category:

Customizing UIBarButtonItem "Done" style and "Plain" style separately using UIAppearance

来源：https://stackoverflow.com/questions/8210977/uibarbuttonitemstyledone-background-image-using-the-ios-5-appearance-api