iOS navigationBar顺滑的隐藏与显示

1、首页签协议

      UINavigationControllerDelegate

2、设置代理

      self.navigationController.delegate = self;

3、实现协议方法

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
    
    BOOL hide = NO;
    
    if ([viewController isKindOfClass: [需要隐藏的VC class]]) {
        hide = YES;
    }
    
    [self.navigationController setNavigationBarHidden: hide animated: animated];
}

以上即可实现navigationBar顺滑的隐藏与显示，不过左滑pop手势会失效，GitHub上有许多优秀的pop手势三方可以借鉴，也可以简单的如下实现

1、签协议

 

2、设置手势、代理   

    UIPanGestureRecognizer *popPanGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self.navigationController.interactivePopGestureRecognizer.delegate action:NSSelectorFromString(@"handleNavigationTransition:")];
    
    popPanGesture.delegate = self;
    
    [self.view addGestureRecognizer: popPanGesture];

3、实现协议方法

- (BOOL)gestureRecognizerShouldBegin:(UIPanGestureRecognizer *)gestureRecognizer{
    if (self.navigationController.viewControllers.count <= 1){
        return NO;
    }
    else{
        return YES;
    }
}