hduhky/TabBarControllerEmbeddedInNavigationController
rootViewController The view controller that resides at the bottom of the navigation stack. This object cannot be an instance of the UITabBarController class.并未觉得有什么问题，有些困惑
Objective-C
rootViewController The view controller that resides at the bottom of the navigation stack. This object cannot be an instance of the UITabBarController class.并未觉得有什么问题，有些困惑
Objective-C