UITabBarController.png

UITabBarController作为一个集合视图控制器，在很多APP上面都会用到。
其视图层级为：

视图层级.png

设置子控件

使用 viewControllers 属性设置

-(UITabBarController *)setRootVCIsTabBarC{
    
    UITabBarController *tabBarC = [UITabBarController new];
    
    UIViewController *vc1 = [UIViewController new];
    vc1.tabBarItem.title = @"主页";
    // 默认图标
    vc1.tabBarItem.image = [UIImage new];
    // 选中图标
    vc1.tabBarItem.selectedImage = [UIImage new];
    
    UIViewController *vc2 = [UIViewController new];
    vc2.tabBarItem.title = @"个人";
    
    tabBarC.viewControllers = @[vc1, vc2];
    
    return tabBarC;
    
}

使用 setViewControllers: animated: 方法设置

-(UITabBarController *)setRootVCIsTabBarC{
    
    UITabBarController *tabBarC = [UITabBarController new];
    
    UIViewController *vc1 = [UIViewController new];
    vc1.tabBarItem.title = @"主页";
    // 默认图标
    vc1.tabBarItem.image = [UIImage new];
    // 选中图标
    vc1.tabBarItem.selectedImage = [UIImage new];

    UIViewController *vc2 = [UIViewController new];
    vc2.tabBarItem.title = @"个人";
    
    [tabBarC setViewControllers:@[vc1, vc2] animated:YES];
    
    return tabBarC;
    
}