現(xiàn)在TabBarController基本是各種應(yīng)用的標(biāo)配了NavigationController更是處處都要用到,如果用storyboard開發(fā)直接在上面拖界面連線即可,如果要用純代碼開發(fā)該如何寫呢?我們可以分為如下幾個(gè)步驟

1.在appDelegate中初始化UIWindow
2.創(chuàng)建TabBarController實(shí)例
3.將所需界面的rootViewController設(shè)置為NavigationController
4.將所需頁(yè)面添加到tabbarController上
5.自定義各自的UITabBarItem
6.設(shè)置window的rootViewController為tabbarController,并讓其顯示

!!!!!注:如果要通過代碼實(shí)現(xiàn)請(qǐng)把main.storyboard刪掉且在info.plist中將Main storyboard file base name的Value值清空

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?


    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        
        //初始化窗口
        self.window = UIWindow(frame: CGRectMake(0,0,SCREEN_WIDTH,SCREEN_HEIGHT))
        
        //創(chuàng)建TabBarController實(shí)例
        let tabbarController = UITabBarController()
        
        //將所需界面的rootViewController設(shè)置為NavigationController
        let rankController = UINavigationController(rootViewController: rankViewController())
        let searchController = UINavigationController(rootViewController: searchViewController())
        let pushController = UINavigationController(rootViewController: pushViewController())
        let circleController = UINavigationController(rootViewController: circleViewController())
        let moreController = UINavigationController(rootViewController: moreViewController())
        
        //將這五個(gè)頁(yè)面添加到tabbarController上
        tabbarController.viewControllers = [rankController,searchController,pushController,circleController,moreController]
        
        //設(shè)置五個(gè)UITabBarItem
        let tabbarItem1 = UITabBarItem(title: "排行榜", image: UIImage(named: "bio"), selectedImage: UIImage(named: "bio_red"))
        let tabbarItem2 = UITabBarItem(title: "發(fā)現(xiàn)", image: UIImage(named: "timer 2"), selectedImage: UIImage(named: "timer 2"))
        let tabbarItem3 = UITabBarItem(title: "", image: UIImage(named: "pencil"), selectedImage: UIImage(named: "user two-2_red"))
        let tabbarItem4 = UITabBarItem(title: "圈子", image: UIImage(named: "users two-2"), selectedImage: UIImage(named: "users two-2_red"))
        let tabbarItem5 = UITabBarItem(title: "更多", image: UIImage(named: "more"), selectedImage: UIImage(named: "more_red"))
        
        //分別將五個(gè)UITabBarItem添加到各自的視圖上
        rankController.tabBarItem = tabbarItem1
        searchController.tabBarItem = tabbarItem2
        pushController.tabBarItem = tabbarItem3
        circleController.tabBarItem = tabbarItem4
        moreController.tabBarItem = tabbarItem5
        
        //設(shè)置tabbar圖標(biāo)及字體被選中時(shí)的顏色,此處用五個(gè)頁(yè)面的其中一個(gè)都可以
        rankController.tabBarController?.tabBar.tintColor = MAIN_RED

        //設(shè)置window的rootViewController為tabbarController,并讓其顯示
        self.window?.rootViewController = tabbarController
        self.window?.makeKeyAndVisible()
        return true
    }

這樣我們就創(chuàng)建出了如下界面

基本界面.png

隨后在各個(gè)界面中實(shí)現(xiàn)自己的代碼即可