Swift 中定义UITabBarController

• UITabBarViewController.swift
  import UIKit
  class UITabBarViewController: UITabBarController {
  class func UITabBarViewController() ->UITabBarController{
  let vc1 = FirstViewController()
  let vc2 = SecondViewController()
  let vc3 = ThirdViewController()
  let vc4 = FourthController()
  let nvc1:UINavigationController = nav(rootViewController: vc1)
  let nvc2:UINavigationController = nav(rootViewController: vc2)
  let nvc3:UINavigationController = nav(rootViewController: vc3)
  let nvc4:UINavigationController = nav(rootViewController: vc4)
  let tabbar1 = UITabBarItem(title: "标题0", image: (Public .getImgView("nenu_first_off")) , selectedImage: (Public .getImgView("nenu_first_on")))
  let tabbar2 = UITabBarItem(title: "标题1", image: (Public .getImgView("nenu_second_off")), selectedImage: (Public .getImgView("nenu_second_on")))
  let tabbar3 = UITabBarItem(title: "标题2", image: (Public .getImgView("nenu_third_off")), selectedImage: (Public .getImgView("nenu_third_on")))
  let tabbar4 = UITabBarItem(title: "标题3", image: (Public .getImgView("nenu_fourth_off")), selectedImage: (Public .getImgView("nenu_service_on")))
  nvc1.tabBarItem = tabbar1
  nvc2.tabBarItem = tabbar2
  nvc3.tabBarItem = tabbar3
  nvc4.tabBarItem = tabbar4
  let tc = UITabBarController()
  tc.tabBar.tintColor = UIColor.init(colorLiteralRed:128.0/255.0, green:179.0/255.0, blue:255.0/255.0, alpha:1)
  tc.viewControllers = [nvc1,nvc2,nvc3,nvc4]
  return tc;
  }
  }

• nav.swift
  import UIKit
  class nav: UINavigationController {
  override func viewDidLoad() {
  super.viewDidLoad()
  let navigationTitleAttribute : NSDictionary = NSDictionary(object: UIColor.whiteColor(),forKey: NSForegroundColorAttributeName)
  self.navigationBar.titleTextAttributes = navigationTitleAttribute as [NSObject : AnyObject] as? [String : AnyObject]
  self.navigationBar .setBackgroundImage(UIImage(named: "4.png"), forBarMetrics: .Default)
  }
  }

• Public.swift
  import UIKit
  class Public: NSObject {
  class func getImgView(ImgName: NSString)->UIImage{
  var image:UIImage = UIImage(named: ImgName as String)!
  image = image.imageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
  return image
  }
  }