隐藏导航栏

使用导航栏代理 隐藏导航栏

//隐藏导航栏
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
    BOOL isSelf = [viewController isKindOfClass:[self class]];
    [self.navigationController setNavigationBarHidden:isSelf animated:YES];
}