UITabBarController

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1、新建ios工程，并添加几个自定义UIViewController,分别取名为MyViewController1，MyViewController2，MyViewController3，

2、AppDelegate中如下初始化

#import "AppDelegate.h"#import "MyViewController1.h"#import "MyViewController2.h"#import "MyViewController3.h"//#import "MyViewController4.h"@interface AppDelegate ()@end@implementation AppDelegate- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    // Override point for customization after application launch.        self.window=[[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];        UITabBarController* tb=[[UITabBarController alloc]init];    UIViewController* vc1=[[MyViewController1 alloc]init];    vc1.tabBarItem.title=@"首页";    //避免图片不显示    vc1.tabBarItem.image=[[UIImage imageNamed:@"img1.png"]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];            UIViewController* vc2=[[MyViewController2 alloc]init];    vc2.tabBarItem.title=@"消息";        UIViewController* vc3=[[MyViewController3 alloc]init];    vc3.tabBarItem.title=@"设置";        tb.viewControllers=@[vc1,vc2,vc3];    //设置底部tab背景    tb.tabBar.backgroundImage=[UIImage imageNamed:@"tb.png"];        self.window.rootViewController=tb;        [self.window makeKeyAndVisible];    return YES;}

3、自定义各个自定义UIViewController界面，例如

#import "MyViewController2.h"@interface MyViewController2 ()@end@implementation MyViewController2- (void)viewDidLoad {    [super viewDidLoad];    self.view.backgroundColor=[UIColor greenColor];    self.tabBarItem.title=@"Vc2title";    //设置图片    self.tabBarItem.image=[[UIImage imageNamed:@"img1.png"]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];    self.tabBarItem.badgeValue=@"5";//显示5条未读消息    // Do any additional setup after loading the view.}

效果图如下

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