导航中视图控制器的层次结构

1.从当前的界面跳转到指定的界面

NSArray *views = self.navigationController.viewControllers;

[ self.navigationController popToViewController:views[1] animated:YES ];

2.从当前的界面跳转到根视图

[ self.navigationController popToRootViewControllerAnimated:YES ];

3.设置导航条的背景图片

[ self.navigationController.navigationBar setBackgroundImage: img  forBarMetrics:UIBarMetricsDefault];

 

4.设置导航栏的背景颜色

[self.navigationController.navigationBar setBarTintColor:[UIColor greenColor]];

5.设置导航条的子视图

UIBarButtonItem *rightItem = [UIBarButtonItem alloc] initWithTitle @"title" style : UIBarButtonItemStylePlain target: nil  action: nil ];

self.navigationItem.rightBarButtonItem =  rightItem;

6.设置导航条子视图的字体大小 和 颜色

[UINavigationBar appearance] setTitleTextAttributes: @{NSFontAttributeName:[UIFont systemFontSize:12] , NSForegroundColorAttributeName:[UIColor grayColor]};

7.占位的子视图

UIBarButtonItem *spaceItem = [UIBarButtonItem alloc] initWithBarButtonSystemItem : UIBarButtonSystemItemFixedSpace target: nil action: nil ] ;