swift微博第1天(基本的项目搭建)

import UIKit
class MainViewController: UITabBarController {
override func viewDidLoad() {
  super.viewDidLoad()
 view.backgroundColor = UIColor.brown
  // 设置当前控制器对应的tabbar对应的颜色
  // 注意：在ios7以前如果设置了tintColor只会改变字的颜色，图片的颜色不会改变
  tabBar.tintColor = UIColor.orange
  addChildViewController(childController: HomeViewController(), tittle: "首页", imageName: "tabbar_home")
  addChildViewController(childController: MessageViewController(), tittle: "消息", imageName: "tabbar_message_center")
  addChildViewController(childController: DiscoverViewController(), tittle: "广场", imageName: "tabbar_discover")
  addChildViewController(childController: ProfileViewController(), tittle: "我", imageName: "tabbar_profile")
 }
   private func addChildViewController(childController: UIViewController,tittle:String ,imageName:String) {
   // 1.设置首页对应的数据
   childController.tabBarItem.image = UIImage(named: imageName)
   childController.tabBarItem.selectedImage = UIImage(named: imageName + "_highlighted")
   childController.title = tittle
   // 2.给子控制器包装一个导航控制器
   let nav = UINavigationController()
   nav.addChildViewController(childController)
   // 3.将导航控制器添加到当前控制器上
   addChildViewController(nav)
  }
}