iphone - [[self tabBarController] navigationController] 和 self.navigationController 之间的区别
我有一个带有选项卡控制器的应用程序，对于一个选项卡，我使用导航控制器。
有人可以告诉我 [[self tabBarController] navigationController] 和 self.navigationController 之间有什么区别吗？
I have an app that has a tabbarcontroller and for one tab I use a navigationcontroller.
Can someone tell me what the difference between [[self tabBarController] navigationController] and self.navigationController is?
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[[self tabBarController] navigationController]将获取 tabBarController 所在的 navigationController。self.navigationController获取self所在的 navigationController。如果相应的实例不是navigationController堆栈的一部分（如果它们不在navigationController中），这些属性将返回
nil[[self tabBarController] navigationController]will get the navigationController that the tabBarController is inside.self.navigationControllergets the navigationController thatselfis inside.These properties will return
nilif the respective instances are not part of a navigationController's stack (if they aren't in a navigationController)我认为
[[self tabBarController] navigationController]是所选选项卡的当前导航控制器。而 self.navigationController 是当前类的导航控制器。I think that
[[self tabBarController] navigationController]is the current navigation controller of the selected tab. Andself.navigationControlleris the navigation controller of the current class.http://developer.apple.com/library/ios/documentation/UIKit/Reference/UIViewController_Class/Reference/Reference.html#//apple_ref/doc/uid/TP40006926-CH3-SW44
导航控制器如果请求属性的控制器位于导航控制器的堆栈中，则属性返回导航控制器。
您的标签栏控制器不是标签栏导航控制器的一部分，在您的情况下应该为零。
http://developer.apple.com/library/ios/documentation/UIKit/Reference/UIViewController_Class/Reference/Reference.html#//apple_ref/doc/uid/TP40006926-CH3-SW44
The navigationController property returns a navigation controller if the the controller the property is asked from is in the navigation controller's stack.
Your tab bar controller is not part of a navigation controller of the tab bar which should be nil in your case.