//当前栈顶得视图控制器
@property(nonatomic,readonly,retain) UIViewController *topViewController;
//当前显⽰示的视图控制器
@property(nonatomic,readonly,retain) UIViewController *visibleViewController;
//在栈中所有视图控制器
@property(nonatomic,copy) NSArray *viewControllers;
//导航栏是否隐藏
@property(nonatomic,getter=isNavigationBarHidden) BOOL navigationBarHidden;
//导航栏
@property(nonatomic,readonly) UINavigationBar *navigationBar;

继续总结