iphone - selected view in UITabBar -

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How can I find out when a user selects an item in the tab bar? I want to run some commands every time, when users select the second or third tab bar view.

(I have a tab bar based project, and tabbar items are selected in View Controller Interface Builder)

I have solved this issue with the use of" viewWillApear: (BOOL) animated "method of each view.

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