swift3 创建TabBarViewController

AppDelegate.swift 文件代码

class AppDelegate: UIResponder, UIApplicationDelegate {
    var window: UIWindow?
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        self.window = UIWindow(frame:UIScreen.main.bounds)
        let rootVC = TabBarViewController()
       // let nav = UINavigationController(rootViewController:rootVC)
        self.window?.rootViewController = rootVC

        self.window!.makeKeyAndVisible()
        return true
    }

TabBarViewController.swift 代码

import UIKit

class TabBarViewController: UITabBarController {
    var _backView:UIView? = nil
    var  items:NSArray = []
    let NameArr = ["首页","分类","购物车","我的"]
    let PicArr = ["main","grid","cart","me"]
    let PicSelectArr = ["main_blue","grid_blue","cart_blue","me_blue"]
    let VCArr = [MainViewController(),ClassViewController(),CartViewController(),MyViewController()]
    //初始化数组
    var NavVCArr:[NSObject] = [NSObject]()

    var nav:UINavigationController = UINavigationController()



    override func viewDidLoad() {
        super.viewDidLoad()

        self.CreatTabBar()
    }

    //创建tabBar
    func CreatTabBar()  {

        _backView = UIView(frame:CGRect(x:0,y:0,width:SCREEN_WIDTH,height:49))


        let  MainVC  = MainViewController()
        MainVC.title = "首页"
        let MainNav = UINavigationController(rootViewController:MainVC)
        MainNav.tabBarItem.title = "首页"
        MainNav.tabBarItem.image = UIImage(named:"main")
        MainNav.tabBarItem.selectedImage = UIImage(named:"main_blue")

        let  ClassVC  = ClassViewController()
        ClassVC.title = "分类"
        let ClassNav = UINavigationController(rootViewController:ClassVC)
        ClassNav.tabBarItem.title = "分类"
        ClassNav.tabBarItem.image = UIImage(named:"grid")
        ClassNav.tabBarItem.selectedImage = UIImage(named:"grid_blue")

        let  CartVC  = CartViewController()
        CartVC.title = "购物车"
        let CartNav = UINavigationController(rootViewController:CartVC)
        CartNav.tabBarItem.title = "购物车"
        CartNav.tabBarItem.image = UIImage(named:"cart")
        CartNav.tabBarItem.selectedImage = UIImage(named:"cart_blue")
        let  MyVC  = MyViewController()
        MyVC.title = "我的"
        let MyNav = UINavigationController(rootViewController:MyVC)
        MyNav.tabBarItem.title = "我的"
        MyNav.tabBarItem.image = UIImage(named:"me")
        MyNav.tabBarItem.selectedImage = UIImage(named:"me_blue")

        // 添加工具栏
        items = [MainNav,ClassNav,CartNav,MyNav]
        self.viewControllers = items as? [UIViewController]
        for  i in 0 ..< items.count {
            /*
             (items[i] as AnyObject) 相当于 self.navigationController?
             **/
            //设置导航栏的背景图片 （优先级高）
            (items[i] as AnyObject).navigationBar.setBackgroundImage(UIImage(named:"NavigationBar"), for:.default)
            //设置导航栏的背景颜色 （优先级低）
            (items[i] as AnyObject).navigationBar.barTintColor = UIColor.orange
            //设置导航栏的字体颜色
            (items[i] as AnyObject).navigationBar.titleTextAttributes =
                [NSForegroundColorAttributeName: UIColor.red]
        }


        /**
         for循环控制器数组 写法

        for  M in 0 ..< VCArr.count {
            nav = UINavigationController(rootViewController:(VCArr[M] as AnyObject as! UIViewController))

            nav.tabBarItem.title = NameArr[M]
            nav.tabBarItem.image = UIImage(named:PicArr[M])
            nav.tabBarItem.selectedImage = UIImage(named:PicSelectArr[M])
            VCArr[M].title = NameArr[M]
            NavVCArr.append(nav)
        }
        // 添加工具栏
       // items = [MainNav,ClassNav,CartNav,MyNav]
        self.viewControllers = NavVCArr as? [UIViewController]
        for  i in 0 ..< NavVCArr.count {
            /*
             (items[i] as AnyObject) 相当于 self.navigationController?
             **/
            //设置导航栏的背景图片 （优先级高）
            (NavVCArr[i] as AnyObject).navigationBar.setBackgroundImage(UIImage(named:"NavigationBar"), for:.default)
            //设置导航栏的背景颜色 （优先级低）
            (NavVCArr[i] as AnyObject).navigationBar.barTintColor = UIColor.orange
            //设置导航栏的字体颜色
            (NavVCArr[i] as AnyObject).navigationBar.titleTextAttributes =
                [NSForegroundColorAttributeName: UIColor.red]

        }
     */
        //tabBar 底部工具栏背景颜色 (以下两个都行)
        self.tabBar.barTintColor = UIColor.orange
        self.tabBar.backgroundColor = UIColor.brown
        //设置 tabBar 工具栏字体颜色 (未选中  和  选中)
        UITabBarItem.appearance().setTitleTextAttributes(NSDictionary(object:UIColor.white, forKey:NSForegroundColorAttributeName as NSCopying) as? [String : AnyObject], for:UIControlState.normal);
        UITabBarItem.appearance().setTitleTextAttributes(NSDictionary(object:UIColor.red, forKey:NSForegroundColorAttributeName as NSCopying) as? [String : AnyObject], for:UIControlState.selected);




    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }



}