iOS正确解决隐藏导航栏后push和pop或dismiss和present闪黑问题

情景: 一级页面不显示导航栏 ，二级页面显示导航栏.

方法一 适用于push/pop：

一级页面中 

- (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];
}

方法二（都适用）：

 设置self为导航控制器的代理,实现代理方法,在将要显示控制器中设置导航栏隐藏和显示,使用这种方式不仅完美切合滑动返回手势,同时也解决了切换tabBar的时候,导航栏动态隐藏的问题.

@interface HomePageController () <UINavigationControllerDelegate>

@end

@implementation HomePageController 

#pragma mark - lifeCycle
- (void)viewDidLoad {
    [super viewDidLoad];

    // 设置导航控制器的代理为self
    self.navigationController.delegate = self;
}

#pragma mark - UINavigationControllerDelegate
// 将要显示控制器
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
    // 判断要显示的控制器是否是自己
    BOOL isShowHomePage = [viewController isKindOfClass:[self class]];

    [self.navigationController setNavigationBarHidden:isShowHomePage animated:YES];
}

 写个基类viewcontroller，只要在基类viewcontroller中：

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

这样你就随心所欲的控制了，只要你想要hidden。给navigationHidden属性赋值yes就好了。