iphone: Button/Image on top of TabBarController?

When in the Camera Roll section of the Photos app, you can c开发者_Python百科lick the top right button to edit the photos. This replaces the bottom tab bar with three new buttons.

I would like to do something similar, but I cannot get my buttons to be on TOP of the tab bar. Is there a way to specify the layer order? Or do I need to do something different?

I would add a new UIView. I would add it to the view your tab bar is in (like, let's say UIWindow). From there you can use -bringViewToFront (or something similar). That way you will have control over what is in front of the UITabBarController's view.