UINavigationControllerHideShowBarDuration ： push pop 时间

初始化

//    UINavigationController *nav = [[UINavigationController alloc]initWithNavigationBarClass:[UINavigationController class] toolbarClass:[UIToolbar class]];
  
    
    ViewController *view = [ViewController new];
    UINavigationController *nav = [[UINavigationController alloc]initWithRootViewController:view];
    [UIApplication sharedApplication].keyWindow.rootViewController = guidePageViewController;

转场

    oneViewController *one = [oneViewController new];
    [self.navigationController pushViewController:one animated:YES];// push 下一个
    
    [self.navigationController popViewControllerAnimated:YES];// pop 上一个 VC
    
    ViewController *view = [ViewController new];
    [self.navigationController popToViewController:view animated:YES];// pop 到某个VC
    
    [self.navigationController popToRootViewControllerAnimated:YES];// pop root

    oneViewController *one = [oneViewController new];
    twoViewController *two = [twoViewController new];
    [self.navigationController setViewControllers:@[self,one,two]];// 一次设置多个子VCs
    [self.navigationController setViewControllers:@[self,one,two] animated:YES];// 同上

获取

    self.navigationController.topViewController;// 顶部
    self.navigationController.visibleViewController;// 可见
    NSArray *arr = self.navigationController.viewControllers;// 所有

    self.navigationController.navigationBar;
    self.navigationController.toolbar;

    ```

## 系统左侧滑

// 左侧向右滑动，代替pop，（也可以自己设置方法，但是注意需要手势代理)
self.navigationController.interactivePopGestureRecognizer.enabled = YES;
self.navigationController.interactivePopGestureRecognizer.delegate = self;
[self.navigationController.interactivePopGestureRecognizer addTarget:self action:@selector(newPop)];

-(void)newPop{
NSLog(@"pop");
}

## 隐藏

// push 隐藏 Nav
oneViewController *one = [oneViewController new];

[self.navigationController setNavigationBarHidden:YES];或者：
self.navigationController.navigationBarHidden = YES;

[self.navigationController pushViewController:one animated:YES];

// 下面toolBar 类似
oneViewController *one = [oneViewController new];

[self.navigationController setToolbarHidden:YES];
self.navigationController.toolbarHidden = YES;

[self.navigationController pushViewController:one animated:YES];

## 代理

• (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated;
• (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated;

• (NSUInteger)navigationControllerSupportedInterfaceOrientations:(UINavigationController *)navigationController NS_AVAILABLE_IOS(7_0);

• (UIInterfaceOrientation)navigationControllerPreferredInterfaceOrientationForPresentation:(UINavigationController *)navigationController NS_AVAILABLE_IOS(7_0);

• (id <UIViewControllerInteractiveTransitioning>)navigationController:(UINavigationController *)navigationController
  interactionControllerForAnimationController:(id <UIViewControllerAnimatedTransitioning>) animationController NS_AVAILABLE_IOS(7_0);

• (id <UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController
  animationControllerForOperation:(UINavigationControllerOperation)operation
  fromViewController:(UIViewController *)fromVC
  toViewController:(UIViewController *)toVC NS_AVAILABLE_IOS(7_0);

## 其他

• (void)showViewController:(UIViewController *)vc sender:(id)sender NS_AVAILABLE_IOS(8_0); // Interpreted as pushViewController:animated:

/// When the keyboard appears, the navigation controller's navigationBar toolbar will be hidden. The bars will remain hidden when the keyboard dismisses, but a tap in the content area will show them.
@property (nonatomic, readwrite, assign) BOOL hidesBarsWhenKeyboardAppears NS_AVAILABLE_IOS(8_0);
/// When the user swipes, the navigation controller's navigationBar & toolbar will be hidden (on a swipe up) or shown (on a swipe down). The toolbar only participates if it has items.
@property (nonatomic, readwrite, assign) BOOL hidesBarsOnSwipe NS_AVAILABLE_IOS(8_0);
/// The gesture recognizer that triggers if the bars will hide or show due to a swipe. Do not change the delegate or attempt to replace this gesture by overriding this method.
@property (nonatomic, readonly, retain) UIPanGestureRecognizer *barHideOnSwipeGestureRecognizer NS_AVAILABLE_IOS(8_0);
/// When the UINavigationController's vertical size class is compact, hide the UINavigationBar and UIToolbar. Unhandled taps in the regions that would normally be occupied by these bars will reveal the bars.
@property (nonatomic, readwrite, assign) BOOL hidesBarsWhenVerticallyCompact NS_AVAILABLE_IOS(8_0);
/// When the user taps, the navigation controller's navigationBar & toolbar will be hidden or shown, depending on the hidden state of the navigationBar. The toolbar will only be shown if it has items to display.
@property (nonatomic, readwrite, assign) BOOL hidesBarsOnTap NS_AVAILABLE_IOS(8_0);
/// The gesture recognizer used to recognize if the bars will hide or show due to a tap in content. Do not change the delegate or attempt to replace this gesture by overriding this method.
@property (nonatomic, readonly, assign) UITapGestureRecognizer *barHideOnTapGestureRecognizer NS_AVAILABLE_IOS(8_0);

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