UITabBarController

//1.创建Window
16     self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
17     self.window.backgroundColor = [UIColor whiteColor];
18
19     //a.初始化一个tabBar控制器
20     UITabBarController *tb=[[UITabBarController alloc]init];
21     //设置控制器为Window的根控制器
22     self.window.rootViewController=tb;
23
24     //b.创建子控制器
25     UIViewController *c1=[[UIViewController alloc]init];
26     c1.view.backgroundColor=[UIColor grayColor];
27     c1.view.backgroundColor=[UIColor greenColor];
28     c1.tabBarItem.title=@"消息";
29     c1.tabBarItem.image=[UIImage imageNamed:@"tab_recent_nor"];
30     c1.tabBarItem.badgeValue=@"123";
31
32     UIViewController *c2=[[UIViewController alloc]init];
33     c2.view.backgroundColor=[UIColor brownColor];
34     c2.tabBarItem.title=@"联系人";
35     c2.tabBarItem.image=[UIImage imageNamed:@"tab_buddy_nor"];
36
37     UIViewController *c3=[[UIViewController alloc]init];
38     c3.tabBarItem.title=@"动态";
39     c3.tabBarItem.image=[UIImage imageNamed:@"tab_qworld_nor"];
40
41     UIViewController *c4=[[UIViewController alloc]init];
42     c4.tabBarItem.title=@"设置";
43     c4.tabBarItem.image=[UIImage imageNamed:@"tab_me_nor"];
44
45
46     //c.添加子控制器到ITabBarController中
47     //c.1第一种方式
48 //    [tb addChildViewController:c1];
49 //    [tb addChildViewController:c2];
50
51     //c.2第二种方式
52     tb.viewControllers=@[c1,c2,c3,c4];
53
54
55     //2.设置Window为主窗口并显示出来
56     [self.window makeKeyAndVisible];