32.怎样在Swift中实现TabBar和导航视图结合的项目？

　　导航栏和TabBar结合的项目，在我们平常开发中会经常看到，下面我们通过自定义的TabBar来实现一个导航和TabBar结合的Demo。

1.自定义TabBar

import UIKit

class GofTabBarController: UITabBarController

{

    override func viewDidLoad()

    {

        super.viewDidLoad();

        addTabBarChildViewController(GofMainViewController(), title: "首页", imageName: "tab_home", selectedImageName: "tab_home_sel", tag: );

        addTabBarChildViewController(GofDrugViewController(), title: "药品列表", imageName: "tab_drug", selectedImageName: "tab_drug_sel", tag: );

        addTabBarChildViewController(GofShopcartViewController(), title: "购物车", imageName: "tab_shopcart", selectedImageName: "tab_shopcart_sel", tag: );

        addTabBarChildViewController(GofMyViewController(), title: "我的", imageName: "tab_my", selectedImageName: "tab_my_sel", tag: );

    }

    private func addTabBarChildViewController(childVC: UIViewController, title: String, imageName: String, selectedImageName: String, tag: Int)

    {

        let vcItem = UITabBarItem(title: title, image: gof_ImageWithName(imageName), selectedImage: gof_ImageWithName(selectedImageName)?.imageWithRenderingMode(.AlwaysOriginal));

        vcItem.tag = tag;

        childVC.tabBarItem = vcItem;

        let navigationVC = UINavigationController(rootViewController: childVC);

        addChildViewController(navigationVC);

    }

    override func tabBar(tabBar: UITabBar, didSelectItem item: UITabBarItem)

    {

        printLog("didSelectIndex:\(item.tag)");

    }

}

2.怎么使用？

let vc = GofTabBarController();

self.window?.rootViewController = vc;