UINavigationController : UIViewController

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  1.创建UINavigationController对象

  UINavigationController *navCV = [[UINavigationController alloc]initWithRootViewController:mainVC]; 

  通常和

  self.window.rootViewController = navCV;

  连用

  
  

  2.- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated; 

  推出第二个页面

  eg:[self.navigationController pushViewController:secondVC animated:YES];

  
  

  3.- (UIViewController *)popViewControllerAnimated:(BOOL)animated; 

  返回上一视图

  eg:[self.navigationController popViewControllerAnimated:YES];

  
  

  4.- (NSArray *)popToViewController:(UIViewController *)viewController animated:(BOOL)animated; 

  返回指定视图

  eg:获得viewController的栈

  UIViewController *viewC = [self.navigationController.viewControllers objectAtIndex:0];

  [self.navigationController popToViewController:viewC animated:YES];

  
  

  5.- (NSArray *)popToRootViewControllerAnimated:(BOOL)animated; 

  返回根视图

  eg:[self.navigationController popToRootViewControllerAnimated:YES];

  
  

  
  

  
  

  UINavigationItem : NSObject <NSCoding>

  每个页面要显示在导航栏上的内容(标题,两边按钮信息)

  
  

  1.rightBarButtonItem

  创建导航栏右边按钮

  参数1 选择一个系统提供的图标信息

  eg:self.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh target:self action:@selector(button:)]autorelease];

  
  

  2.leftBarButtonItem

  创建导航栏左边按钮

  eg:self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc]initWithImage:[UIImage imageNamed:@"iconfont-yinle.png"] style:UIBarButtonItemStylePlain target:self action:@selector(button:)]autorelease];

  
  

  3.hidesBackButton

  隐藏返回按钮

  eg:self.navigationItem.hidesBackButton = YES;

  
  

  4.titleView

  标题相关设置

  eg:self.navigationItem.titleView = [[[UISegmentedControl alloc]initWithItems:@[@"111",@"222"]]autorelease];

  
  

  
  

  UINavigationbar

  
  

  1.translucent

  是否透明

  eg:self.navigationController.navigationBar.translucent = YES;

  
  

  2.barTintColor

  bar的颜色eg:self.navigationController.navigationBar.barTintColor = [UIColor grayColor];

  
  

  3.setNavigationBarHidden

  隐藏bar

  e.g.:[self.navigationController setNavigationBarHidden:NO];

  
  

  4.automaticallyAdjustsScrollViewInsets

  取消掉scrollView的系统设置的UIEdgeInsets

  e.g.:elf.automaticallyAdjustsScrollViewInsets = YES;

  (当页面出现不可预知问题时可以尝试使用这个开关)

  
  

  5.setBackgroundImage

  设置bar背景图片

  eg：[self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"2.png"] forBarMetrics:UIBarMetricsDefault];