标签控制器的简单使用

//下列代码为创建3个控制器分别为n1,n2,n3

UINavigationController*n1=[[UINavigationController alloc]initWithRootViewController:[[FirstViewController alloc]init]];

n1.tabBarItem=[[UITabBarItem alloc]initWithTitle:@"111"image:nil tag:0];

UINavigationController*n2=[[UINavigationController alloc]initWithRootViewController:[[SecondViewController alloc]init]];

n2.tabBarItem=[[UITabBarItem alloc]initWithTitle:@"222"image:nil tag:1];

UINavigationController*n3=[[UINavigationController alloc]initWithRootViewController:[[ThirdViewController alloc]init]];

n3.tabBarItem=[[UITabBarItem alloc]initWithTitle:@"333"image:nil tag:2];

//小红点

n3.tabBarItem.badgeValue[email protected]"2";

self.viewControllers[email protected][n1,n2,n3];

self.tabBarController.selectedViewController= [self.viewControllers objectAtIndex:1];