Creating Navigation Controllers

方法：initWithRootViewController:

Initializes and returns a newly created navigation controller.

- (instancetype)initWithRootViewController:(UIViewController *)rootViewController

参数：UIViewController

方法：initWithNavigationBarClass:toolbarClass
Initializes and returns a newly created navigation controller that uses your custom bar subclasses.

- (instancetype)initWithNavigationBarClass:(Class)navigationBarClass
                              toolbarClass:(Class)toolbarClass

参数：navigationBarClass、toolbarClass

属性：topViewController

The view controller at the top of the navigation stack. (read-only)

@PRoperty(nonatomic, readonly, retain) UIViewController *topViewController

属性：visibleViewController

The view controller associated with the currently visible view in the navigation interface. (read-only)

@property(nonatomic, readonly, retain) UIViewController *visibleViewController

属性：viewControllers

 The view controllers currently on the navigation stack.

@property(nonatomic, copy) NSArray *viewControllers

方法：setViewControllers:animated:

Replaces the view controllers currently managed by the navigation controller with the specified items.

- (void)setViewControllers:(NSArray *)viewControllers
                  animated:(BOOL)animated

Pushing and Popping Stack Items

方法：pushViewController:animated:

Pushes a view controller onto the receiver’s stack and updates the display.

- (void)pushViewController:(UIViewController *)viewController
                  animated:(BOOL)animated

参数：viewController、animated

方法：popViewControllerAnimated:

Pops the top view controller from the navigation stack and updates the display.

- (UIViewController *)popViewControllerAnimated:(BOOL)animated

参数：animated

方法：popToRootViewControllerAnimated:

Pops all the view controllers on the stack except the root view controller and updates the display.

- (NSArray *)popToRootViewControllerAnimated:(BOOL)animated

参数：animated

方法：popToViewController:animated:

Pops view controllers until the specified view controller is at the top of the navigation stack.

- (NSArray *)popToViewController:(UIViewController *)viewController
                        animated:(BOOL)animated

参数：viewController、animated

属性：interactivePopGestureRecognizer 

The gesture recognizer responsible for popping the top view controller off the navigation stack. (read-only)

@property(nonatomic, readonly) UIGestureRecognizer *interactivePopGestureRecognizer

Configuring Navigation Bars

属性：navigationBar

 The navigation bar managed by the navigation controller. (read-only)

@property(nonatomic, readonly) UINavigationBar *navigationBar

方法：-setNavigationBarHidden:animated:

Sets whether the navigation bar is hidden.

- (void)setNavigationBarHidden:(BOOL)hidden
                      animated:(BOOL)animated

Hiding the Navigation Bar

属性：hidesBarsOnTop

属性: hidesBarsOnSwipe

属性：hidesBarsWhenVerticallyCompact

属性：hidesBarsWhenKeboardAppears

属性：navigationBarHidden

属性：barHideOnTapGestureRecognzier

属性：barHideOnSwipeGestureRecognizer

附言：

Use this initialization method if you want to use custom navigation bar or toolbar subclasses with the navigation controller. If you use this method, you are responsible for adding a root view controller before presenting the navigation controller onscreen.