Prevent automatic popToRootViewController on double-tap of UITabBarController

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Use the tabBarController:shouldSelectViewController: method of the UITabBarControllerDelegate protocol.

- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController {
    return viewController != tabBarController.selectedViewController;
}

Don’t forget to set the delegate of the tab bar controller to the object that actually implements this delegate method.

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