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//创建window

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

//初始化 tabbar controller

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

//创建子控制器

UIViewController * vc1 = [[UIViewController alloc] init];

UIViewController * vc2 = [[UIViewController alloc] init];

UIViewController * vc3 = [[UIViewController alloc] init];

//设置子控制器颜色

vc1.view.backgroundColor = [UIColor redColor];

vc2.view.backgroundColor = [UIColor blackColor];

vc3.view.backgroundColor = [UIColor orangeColor];

//添加自控制器到tabbartc上

tc.viewControllers = @[vc1,vc2,vc3];

//设置tabbar内容

vc1.tabBarItem.title = @"论坛";

vc1.tabBarItem.image = [UIImage imageNamed:@"visitordiscover_image_message"];

vc2.tabBarItem.title = @"社区";

vc2.tabBarItem.image = [UIImage imageNamed:@"visitordiscover_image_profile"];

vc3.tabBarItem.title = @"设置";

vc3.tabBarItem.image = [UIImage imageNamed:@"tab_me_nor"];

//设置vindow的根控制器为tabbartc

self.window.rootViewController = tc;

//显示

[self.window makeKeyAndVisible];

return YES;

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