UINavigationController
1.initWithRootViewController:方式内部将controller压入栈底 不会调用导航控制器的pushViewController
2.导航控制器的childViewControllers与viewControllers都是压栈的控制器 viewControllerske可读可写
3.push与pop的底层最终就是操作viewControllerske
4.导航栏透明的方式
[self.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
[self.navigationController.navigationBar setShadowImage:[UIImage new]];
5.自定义返回按钮
UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
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