加载定义界面

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

{

// 1.创建窗口

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

// 2.设置窗口的根控制器

MyTabBarController *tabBarVC = [[MyTabBarController alloc]init];

self.window.rootViewController = tabBarVC;

// 3.显示窗口

[self.window makeKeyAndVisible];

return YES;

}