簡介

• 第一種做法 
  

  -(void)viewWillAppear:(BOOL)animated
  {
      self.navigationController.navigationBarHidden = YES;
      [super viewWillAppear:animated];
  
  }
  
  - (void)viewWillDisappear:(BOOL)animated
  {
      self.navigationController.navigationBarHidden = NO;
      [super viewWillDisappear:animated];
  }
   
  

  
  但是,有時候第一種方法不起作用;我們就需要設定self為導航控制器的代理,實現代理方法,在將要顯示控制器中設定導航欄隱藏和顯示,使用這種方式不僅完美切合滑動返回手勢,同時也解決了切換tabBar的時候,導航欄動態隱藏的問題.
• 第二種做法

@interface viewController ()<UINavigationControllerDelegate>
@end

@implementation viewController


- (void)viewDidLoad {
//    self.navigationController.navigationBarHidden = YES;

    [super viewDidLoad];
    // Do any additional setup after loading the view.
    [self setUpUI];
    // 設定導航控制器的代理為self
    self.navigationController.delegate = self;

}
#pragma mark - UINavigationControllerDelegate
// 將要顯示控制器
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
    // 判斷要顯示的控制器是否是自己
    BOOL isShowHomePage = [viewController isKindOfClass:[self class]];
    
    [self.navigationController setNavigationBarHidden:isShowHomePage animated:YES];
}