場景：某個控制器不需要導航

• 直接使用：

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    [self.navigationController setNavigationBarHidden:YES animated:animated];
}

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    [self.navigationController setNavigationBarHidden:NO animated:animated];
}
 

• 缺點：
  如果這個不需要導航的控制器，
  是TabBarController的一個子控制器，
  在切換tabBar的時候會有一個導航欄上滑消失的動畫

• 方案：
  在需要導航的控制器內

- (void)viewDidLoad {
    [super viewDidLoad];
    self.navigationController.delegate = self;
}

#pragma mark - UINavigationControllerDelegate
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
    BOOL isMe = [viewController isKindOfClass:[self class]];
    [self.navigationController setNavigationBarHidden:isMe animated:YES];
}

- (void)dealloc {
    self.navigationController.delegate = nil;
}
 

參考：

iOS導航欄的正確隱藏方式：https://www.jianshu.com/p/1f72cd2771fe