swift-自定义TabBar工具栏

class EBTAppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?


    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        
        self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
        self.window!.backgroundColor = UIColor.whiteColor()

        /**首页*/
        let storyBoard = UIStoryboard(name: "Main", bundle: nil)
        let firstCtl = storyBoard.instantiateViewControllerWithIdentifier("EBTFirstViewController") as! EBTFirstViewController
        let firstNav = UINavigationController(rootViewController: firstCtl)
        
        /**投资*/
        let secondCtl = storyBoard.instantiateViewControllerWithIdentifier("EBTSecondViewController") as! EBTSecondViewController
        let secondNav = UINavigationController(rootViewController: secondCtl)

        
        /**活动*/
        let thirdCtl = storyBoard.instantiateViewControllerWithIdentifier("EBTThirdViewController") as! EBTThirdViewController
        let thirdNav = UINavigationController(rootViewController: thirdCtl)

        /**财富*/
        let fourCtl = storyBoard.instantiateViewControllerWithIdentifier("EBTFourViewController") as! EBTFourViewController
        let fourNav = UINavigationController(rootViewController: fourCtl)
        let navArray = [firstNav,secondNav,thirdNav,fourNav]
        let tabBarController = UITabBarController()
        tabBarController.viewControllers = navArray
        tabBarController.selectedIndex = 0
        
        let selectImageArray = ["tab_button_0_tap","tab_button_1_tap","tab_button_2_tap","tab_button_3_tap"]
        let normalImageArray = ["tab_button_0","tab_button_1","tab_button_2","tab_button_3"]
        let titleArray = ["首页","投资","活动","财富"]
        var count:Int = 0

        for var i = 0;i < navArray.count;i++
        {
         var tabBarItem = navArray[i].tabBarItem
        /**屏蔽系统的背景颜色,声明这张图片用原图(别渲染)*/
            var normalImage = UIImage(named: normalImageArray[i])
            normalImage = normalImage?.imageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
            
         var selectImage = UIImage(named: selectImageArray[i])
             selectImage = selectImage?.imageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
            
            tabBarItem.title = titleArray[i]
            tabBarItem.selectedImage = selectImage
            tabBarItem.image = normalImage
            tabBarItem .setTitleTextAttributes([NSForegroundColorAttributeName:UIColor(red: 207.0/255.0, green: 44.0/255.0, blue: 65.0/255.0, alpha: 1.0),NSFontAttributeName:UIFont.boldSystemFontOfSize(12)], forState: UIControlState.Selected)
           
        }
        //MARK: 设置导航栏背景颜色
        let topColor = UIColor.redColor()
        let topImage = UIImage.imageWithColor(topColor)
    
        let navBar = UINavigationBar.appearance()
        navBar.setBackgroundImage(topImage, forBarMetrics: UIBarMetrics.Default)
        self.window!.rootViewController = tabBarController
        self.window!.makeKeyAndVisible()
        return true
    }