UITabBarControllor

//所有视图的开端，必须在appDelegate开始编写，下面的代码是在appDelegate.m里面编写

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    
    //创建主窗口
    self.window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen] bounds]];
    
    //把tabbar controllor 设置为根视图
    MyTabBarController *mt = [[MyTabBarController alloc]init];
    self.window.rootViewController = mt;
    
    [self.window makeKeyAndVisible];
    
    //设置背景色，默认为黑色
//    self.window.backgroundColor = [UIColor redColor];
    return YES;
}

#import "MyTabBarController.h"

@interface MyTabBarController ()

@end

@implementation MyTabBarController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    UIViewController *c1 = [[UIViewController alloc]init];
    //设置tab bar item的名称
    c1.tabBarItem.title = @"客户";
    //设置view的背景色
    c1.view.backgroundColor = [UIColor redColor];
    //设置背景图
    c1.tabBarItem.image = [UIImage imageNamed:@"customer2"];
    
    
    UIViewController *c2 = [[UIViewController alloc]init];
    c2.tabBarItem.title = @"列表";
    c2.view.backgroundColor = [UIColor whiteColor];
    c2.tabBarItem.image = [UIImage imageNamed:@"list"];
    
    
    //添加视图两种方法
    //第一种，不建议这种，这个list本身是NSArray，不变数组，所以每次添加使，项目内容不与之前项目相同会自动重建新的数组重新添加
//    [self addChildViewController:c1];
//    [self addChildViewController:c2];

    //第二种方法
    self.viewControllers=@[c1,c2];
    
}


- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.    
}
*/

@end