iOS tabbar+navgation的项目结构

1.AppDelegate.m

    self.window.frame = [[UIScreen mainScreen] bounds];
    
    self.window.backgroundColor = [UIColor whiteColor];
    
    XGGTabBarController *navc = [[XGGTabBarController alloc] init];
    
    self.window.rootViewController = navc;
    
    [self.window makeKeyAndVisible];

2.UITabBarController.m

- (void)viewDidLoad {
    [super viewDidLoad];
   
    // 设置标题字体颜色
    [[UITabBarItem appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor blackColor]} forState:UIControlStateNormal];
    [[UITabBarItem appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor orangeColor]} forState:UIControlStateSelected];
    // 设置标题字体大小
    [[UITabBarItem appearance] setTitleTextAttributes:@{NSFontAttributeName : [UIFont systemFontOfSize:8.0]} forState:UIControlStateNormal];
    
    
 
    [self addChildVC:[[XGGMainController alloc]init] title:@"主页" normalImage:@"friendsRecommentIcon" selectedImage:@"friendsRecommentIcon-click"];

    [self addChildVC:[[XGGRealmController alloc]init] title:@"其他" normalImage:@"MainTagSubIcon" selectedImage:@"MainTagSubIconClick"];
    
    [self addChildVC:[[XGGViewController alloc]init] title:@"这个" normalImage:@"nav_coin_icon" selectedImage:@"nav_coin_icon_click"];

    
}





- (void)addChildVC:(UIViewController *)controller title:(NSString *)title normalImage:(NSString *)normalImage selectedImage:(NSString *)selectedImage
{
    
    UINavigationController *navc = [[UINavigationController alloc] initWithRootViewController:controller];
    
    navc.tabBarItem.title = title;
    
    navc.tabBarItem.image = [[UIImage imageNamed:normalImage] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    
    navc.tabBarItem.selectedImage = [[UIImage imageNamed:selectedImage] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    
    controller.navigationItem.title = title;
    
    [self addChildViewController:navc];
}

3.ViewController.m

   // self.title = @"主页";
    
    self.navigationItem.title = @"主页";