- (void)viewWillAppear:(BOOL)animated {
 [super viewWillAppear:animated];

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

- (void)viewWillDisappear:(BOOL)animated {
 [super viewWillDisappear:animated];

 [self.navigationController setNavigationBarHidden:NO animated:YES];
}

@interface WLHomePageController () <UINavigationControllerDelegate>

@end

@implementation WLHomePageController

#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];
}