UI - NavigationController

/************************************* 导航栏的定制 *************************************/    self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];    self.window.backgroundColor = [UIColor whiteColor];    [self.window makeKeyAndVisible];    //设置导航控制器:    //1.创建一个根视图控制器    ViewController *vc = [[ViewController alloc]init];    //2.vc作为导航控制器的根视图控制器    UINavigationController *navi = [[UINavigationController alloc]initWithRootViewController:vc];    //3.导航控制器是window的根视图控制器    self.window.rootViewController = navi;    navi.view.backgroundColor = [UIColor whiteColor];/************************************* 导航控制器推出视图 *************************************/    SecondViewController *svc = [[SecondViewController alloc]init];//    采用出栈入栈的方式推出下个页面 push pop 先进(栈底)后出(栈顶)    //1.进入下一个视图控制器    [self.navigationController pushViewController:svc animated:YES];    //2.返回上一个视图控制器    [self.navigationController popToRootViewControllerAnimated:YES];    //3.返回指定的视图控制器    [self.navigationController popToViewController:svc animated:YES];    //4.返回到根视图控制器    [self.navigationController popToRootViewControllerAnimated:YES];    //常用属性    //1.所有处于栈中的控制器    self.navigationController.viewControllers;    //2.位于栈顶的控制器    self.navigationController.topViewController;    //3.当前正在显示的控制器    self.navigationController.visibleViewController;    //4.导航条    self.navigationController.navigationBar;/************************************* 导航控制器的创建 *************************************///    一、对导航栏的定制: 影响每个子视图//    self.navigationController.navigationBar    //(1)半透明效果(默认打开, 若关闭, 左边原点会在导航栏的左下方, 整个屏幕下移)    self.navigationController.navigationBar.translucent = YES;    //调整: 状态栏20 导航栏44(横屏 32)    //(2)背景颜色(最上层导航栏)    self.navigationController.navigationBar.barTintColor = [UIColor yellowColor];    //(最下层导航栏)    self.navigationController.navigationBar.backgroundColor = [UIColor blackColor];    //(3)添加导航栏的背景图片, 半透明效果自动关闭    [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"2.jpg"] forBarMetrics:UIBarMetricsDefault];//    二、设置当前控制器显示在导航栏上的信息//    self.navigationController.navigationItem    //(1)设置标题    //1.第一种方式:推荐    self.navigationItem.title = @"第一页";    //2.第二种方式: 会影响其他的东西//    self.title = @"首页";    //(2)自定义标题视图    self.navigationItem.titleView = [[UISegmentedControl alloc]initWithItems:@[@"消息", @"电话"]];    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemPlay target:self action:@selector(leftBarButtonAction:)];//    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"变色" style:UIBarButtonItemStylePlain target:self action:@selector(rightBarButtonAction:)];    //使用矢量图: 百度阿里巴巴矢量图//    imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal(取消渲染)    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithImage:[[UIImage imageNamed:@"4.png"]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal] style:UIBarButtonItemStylePlain target:self action:@selector(rightBarButtonAction:)];    //渲染颜色设置    self.navigationController.navigationBar.tintColor = [UIColor blackColor];