首先设置Navigationbar为hidden：

self.navigationController.navigationBarHidden = YES;

然后创建NavBar:

UINavigationBar *mainNavBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, offsetY, self.view.bounds.size.width, 44.f)];[mainNavBar useCustomNavigationBarWithColor:[UIColor titleBlueColor]];[self.view addSubview:mainNavBar];