navigationController視圖的

Question

當我們做這樣

self.navigationController.toolBarHidden = NO; 

問題：在哪裏呢navigationController從何而來。我看看UIViewController.h，但我根本找不到那個屬性

請給我建議。由於

Answer 1

看（UINavigationControler.h在）上UIViewController的UINavigationControllerItem類別：

@interface UIViewController (UINavigationControllerItem) 

@property(nonatomic,readonly,retain) UINavigationItem *navigationItem; // Created on-demand so that a view controller may customize its navigation appearance. 
@property(nonatomic) BOOL hidesBottomBarWhenPushed; // If YES, then when this view controller is pushed into a controller hierarchy with a bottom bar (like a tab bar), the bottom bar will slide out. Default is NO. 
@property(nonatomic,readonly,retain) UINavigationController *navigationController; // If this view controller has been pushed onto a navigation controller, return it. 

@end