iOS--UITabBarController demo

一个简单的tabBar

记得手动把ViewController继承UIViewController改成UITabBarController

@implementationViewController

- (void)viewDidLoad {

[superviewDidLoad];

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=@"2";

self.viewControllers=@[n1,n2,n3];

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

}

@end