在带有导航控制器的选项卡栏应用程序中，如何从选项卡栏层次结构中的第一个视图开始
我有基于选项卡栏的应用程序，我想在每次按下选项卡时启动与它们关联的第一个视图。问题是，当应用程序启动时，它从第一个视图开始，但在使用应用程序时，我可能会深入导航到一个选项卡，现在如果我想使用与按下的选项卡关联的主视图再次启动它，该怎么办？
I have tabbar based application, I want to start each time tab is pressed to start with first view they are associated with. Problem is it starts with first view when its a start of application but while using application i may navigate deep in to one tab and now what to do if i want to start it again with main view associated with that tab which is pressed?
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您可以使用选项卡栏委托来覆盖此行为。
UITabBarControllerDelegate记录如下：http://developer.apple.com/library/ios/#documentation/uikit/reference/UITabBarControllerDelegate_Protocol/Reference/Reference.html
您需要查看：
tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController每次触发此委托方法时，您都可以触发相应导航控制器的
popToRootViewController:animated方法。通常，您的应用程序委托也可以是选项卡控制器委托，但这取决于您的实现。You can use the tabbar delegates to override this behaviour. The
UITabBarControllerDelegateis documented here:http://developer.apple.com/library/ios/#documentation/uikit/reference/UITabBarControllerDelegate_Protocol/Reference/Reference.html
You would want to look at:
tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewControllerEverytime this delegate method is triggered you can trigger the corresponding navigation controller's
popToRootViewController:animatedmethod. Normally you'd have your app delegate be the tabbar controller delegate also, but that's up to your implementation.