Borderless UIButton that highlights when touched

I'd like to create a UIButton with an image that has no borders (a la UIButtonTypeInfoDark) but that highlights when you tap it. How can I do th开发者_运维技巧is?

Create a UIButton in interface builder, change the type to custom (and select your image). Add an IBOutlet, then in your viewDidLoad set showsTouchWhenHighlighted to YES.