分栏控制器UITabBarController

self.window= [[UIWindowalloc]initWithFrame:[UIScreenmainScreen].bounds];

UITabBarController* tabBarController = [[UITabBarControlleralloc]init];

VCSecond* second =[[VCSecondalloc]init];

UITabBarItem* secondtabBar = [[UITabBarItemalloc]initWithTabBarSystemItem:UITabBarSystemItemTopRatedtag:103];

secondtabBar.badgeValue=@"22";

second.tabBarItem= secondtabBar;

VCThird* third =[[VCThirdalloc]init];

UITabBarItem* tabBar = [[UITabBarItemalloc]initWithTabBarSystemItem:UITabBarSystemItemBookmarkstag:102];

tabBar.badgeValue=@"21";

third.tabBarItem= tabBar;

tabBarController.viewControllers=@[

second,third

];

tabBarController.selectedIndex=1;

self.window.rootViewController= tabBarController;

[self.windowmakeKeyAndVisible];