UINavigationController和UITabBarController

使用一个控制器A去管理多个控制器，如B,C；控制器A称为父控制器，B,C称为子控制器；

iOS提供了这两个比较特殊的控制器，根据需要可以自定义;

UINavigationController:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

// Override point for customization after application launch.

// 创建窗口

_window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];

// 窗口背景色

_window.backgroundColor = [UIColor whiteColor];

// 实例控制器 a

AViewController *a = [[AViewController alloc] init];

// 实例导航控制器 nav

UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:a];

// 设置根控制器为nav

self.window.rootViewController = nav;

//

[_window makeKeyAndVisible];

return YES;

}

UITabBarController:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

// Override point for customization after application launch.

// 创建窗口

_window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];

// 窗口背景色

_window.backgroundColor = [UIColor whiteColor];

// 实例控制器 a

AViewController *a = [[AViewController alloc] init];

BViewController *b = [[BViewController alloc] init];

// 实例导航控制器 anav

UINavigationController *anav = [[UINavigationController alloc] initWithRootViewController:a];

UINavigationController *bnav = [[UINavigationController alloc] initWithRootViewController:b];

// 实例tab

UITabBarController *tab = [[UITabBarController alloc] init];

// nav加到tab上

tab.viewControllers = @[anav, bnav];

// 设置根控制器为nav

self.window.rootViewController = tab;

//

[_window makeKeyAndVisible];

return YES;

}