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

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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.

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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.