UINavigationController讲解（一）

UINavigationController讲解（一）

UINavigationController简单介绍

1. 初始化

   //通过一个自定义的导航栏和工具栏创建导航控制器
   - (instancetype)initWithNavigationBarClass:(nullable Class)navigationBarClass toolbarClass:(nullable Class)toolbarClass NS_AVAILABLE_IOS(5_0);
   //使用系统默认的导航栏和工具栏，通过一个根视图创建导航控制器
   - (instancetype)initWithRootViewController:(UIViewController *)rootViewController;
   

2. 导航栏常用方法

   //通过压栈方式压入新的控制器（切换界面）
   - (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated; // Uses a horizontal slide transition. Has no effect if the view controller is already in the stack.
   //从栈中弹出顶部控制器（返回）
   - (UIViewController *)popViewControllerAnimated:(BOOL)animated; // Returns the popped controller.
   //从栈中弹出到某个控制器 返回所有pop的controller
   - (NSArray<__kindof UIViewController *> *)popToViewController:(UIViewController *)viewController animated:(BOOL)animated; // Pops view controllers until the one specified is on top. Returns the popped controllers.
   //直接pop到根视图控制器，弹出所有控制器
   - (NSArray<__kindof UIViewController *> *)popToRootViewControllerAnimated:(BOOL)animated;

3. 常用属性

   //栈顶的控制器
   @property(nullable, nonatomic,readonly,strong) UIViewController *topViewController; 
   //显示的controller（包括present出的控制器）
   @property(nullable, nonatomic,readonly,strong) UIViewController *visibleViewController;
   //栈中所有的控制器
   @property(nonatomic,copy) NSArray<__kindof UIViewController *> *viewControllers;
   //设置隐藏导航栏
   @property(nonatomic,getter=isNavigationBarHidden) BOOL navigationBarHidden;
   - (void)setNavigationBarHidden:(BOOL)hidden animated:(BOOL)animated;
   //导航栏对象，只读属性
   @property(nonatomic,readonly) UINavigationBar *navigationBar;
   //隐藏状态栏
   @property(nonatomic,getter=isToolbarHidden) BOOL toolbarHidden NS_AVAILABLE_IOS(3_0);
   - (void)setToolbarHidden:(BOOL)hidden animated:(BOOL)animated;
   //状态栏对象
   @property(null_resettable,nonatomic,readonly) UIToolbar *toolbar;
   //导航中的返回手势对象
   //iOS7之后，在导航中右划会进行pop操作，设置这个的enable可以控制设置手势是否失效
   @property(nullable, nonatomic, readonly) UIGestureRecognizer *interactivePopGestureRecognizer;
   //这个方法是为了iOS方法的命名统一，在导航中，其作用和push一样
   - (void)showViewController:(UIViewController *)vc sender:(nullable id)sender;
   //弹出键盘的时候隐藏导航栏
   @property (nonatomic, readwrite, assign) BOOL hidesBarsWhenKeyboardAppears;
   //屏幕滑动的时候隐藏导航栏，常用于tableView,上滑隐藏导航栏，下滑显示，带动画效果
   @property (nonatomic, readwrite, assign) BOOL hidesBarsOnSwipe;
   //滑动隐藏导航栏的手势
   @property (nonatomic, readonly, strong) UIPanGestureRecognizer *barHideOnSwipeGestureRecognizer;
   //横屏的时候隐藏导航栏
   @property (nonatomic, readwrite, assign) BOOL hidesBarsWhenVerticallyCompact;
   //敲击屏幕可以隐藏与显示导航栏
   @property (nonatomic, readwrite, assign) BOOL hidesBarsOnTap;
   //敲击屏幕的手势
   @property (nonatomic, readonly, assign) UITapGestureRecognizer *barHideOnTapGestureRecognizer;

4. UINavigationDelegate

   //视图将要展示时调用的方法
   - (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated;
   //视图已经展示时调用的方法
   - (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated;
   //设置方法设置导航控制器支持的设备方向
   - (UIInterfaceOrientationMask)navigationControllerSupportedInterfaceOrientations:(UINavigationController *)navigationController NS_AVAILABLE_IOS(7_0);
   //这个方法设置导航控制器的首选设备方向
   - (UIInterfaceOrientation)navigationControllerPreferredInterfaceOrientationForPresentation:(UINavigationController *)navigationController NS_AVAILABLE_IOS(7_0);
   //下面两个方法可以对导航的转场动画进行设置
   - (nullable id )navigationController:(UINavigationController *)navigationController interactionControllerForAnimationController:(id ) animationController;
   - (nullable id )navigationController:(UINavigationController *)navigationController animationControllerForOperation:(UINavigationControllerOperation)operation fromViewController:(UIViewController *)fromVC toViewController:(UIViewController *)toVC ;