swift 2.0 与 OC 相比较，标签栏和导航栏书写的差别

下面是swift书写的时候的两个方法，其实这里不是教大家怎么样写的这个问题，我是想通过这两个不同语言的进行的一个比较，向大家找他们之间“想法”上的一些相同点，这样子我们学习swift的时候，就可以更加的游刃有余。我们熟悉OC这门语言，找到他么想法上的相同点了，你也就可以利用OC来学习swift了。

private func addChildViewControllers() {
        
       tabBar.tintColor = UIColor.orangeColor()
       zxaddChildViewController(HomeViewController(), title: "首页", imageName: "tabbar_home")
       zxaddChildViewController(MessageViewController(), title: "消息", imageName: "tabbar_message_center")
       zxaddChildViewController(DiscoverViewController(), title: "发现", imageName: "tabbar_discover")
       zxaddChildViewController(ProfileViewController(), title: "我", imageName: "tabbar_profile")
    
   }
    
   private func zxaddChildViewController(vc: UIViewController, title: String, imageName: String) {
       
       vc.title = title
       vc.tabBarItem.image = UIImage(named: imageName)
       addChildViewController(UINavigationController(rootViewController: vc))
        
   }

下面是我们熟悉的OC的写法

HomeViewController * home =[[HomeViewController alloc]init];
home.title=@"首页";
home.tabBarItem.title=@"首页";
UINavigationController * na = [[UINavigationController alloc]initWithRootViewController:home];
 
HomeViewControllerone * home1 =[[HomeViewControllerone alloc]init];
home1.title=@"首页1";
home1.tabBarItem.title=@"首页2";
UINavigationController * na1 = [[UINavigationController alloc]initWithRootViewController:home1];
 
HomeViewControllertwo * home2 =[[HomeViewControllertwo alloc]init];
home2.title=@"首页3";
home2.tabBarItem.title=@"首页3";
UINavigationController * na2 = [[UINavigationController alloc]initWithRootViewController:home2];
 
 
HomeViewControllerT * home3 =[[HomeViewControllerT alloc]init];
home3.title=@"首页4";
home3.tabBarItem.title=@"首页4";
UINavigationController * na3 = [[UINavigationController alloc]initWithRootViewController:home3];
 
self.viewControllers=@[na,na1,na2,na3];