iphone TabBarController, how to resize it to height?

any one know how to resize the TabBar? i want make it 80px height for use my custom background and buttons,a开发者_高级运维nd make it more beautiful.

thank you

Don't do it. Why waste extra pixels for a tab bar? Users would much rather have more room for the content. Scale your background and buttons appropriately to fit its current height.

You can't do this with Apple's tab bar. But you could make your own custom tab bar, which is what some other applications do.