對于我這個入門級小白來說研究了老半天才將oc的tabbar寫法翻譯成swift寫法·····廢話不多說現在開始。
我的思路是讓tabbarcontroller做四個navigationcontroller的容器。
首先把工程里的mainstoryboard里的頁面刪掉，拖一個tabbarcontroller控件進來，并在右側屬性欄將該控件選擇為初始頁面（以initial·········為開頭的選項）
然后建立第一個頁面的storyboard，并將里面的navigationcontroller（沒有的話就拖一個進來）設置成初始頁面（和tabbarcontroller設置一樣）并再拖一個tabbaritem（tabbar的按鈕）到該navigationcontroller下。后面的個頁面也是如此照做。代碼都在appdelegate里寫的。下面是代碼

oc代碼（四個頁面）：

@interface AppDelegate ()

@end

@implementation AppDelegate


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    UITabBarController *tab =[[UIStoryboard storyboardWithName:@"Main"
        bundle:nil]instantiateInitialViewController];
    UINavigationController * first = [[UIStoryboard storyboardWithName:@"First" bundle:nil]
            instantiateInitialViewController];
    UINavigationController * second = [[UIStoryboard storyboardWithName:@"Second" bundle:nil]
            instantiateInitialViewController];
    UINavigationController * third = [[UIStoryboard storyboardWithName:@"Third" bundle:nil]
            instantiateInitialViewController];
    UINavigationController * fouth = [[UIStoryboard storyboardWithName:@"Fouth" bundle:nil]
            instantiateInitialViewController];


    tab.viewControllers = @[first,second,third,fouth];
    self.window.rootViewController = tab;
}

swift代碼（這個是五個頁面的）：

import UIKit
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?
   
   
    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        // Override point for customization after application launch.
        // MARK: - Action
        
        let tab:(UITabBarController) = UIStoryboard.init(name: "Main", bundle: nil).instantiateInitialViewController()as!UITabBarController

        let first:(UINavigationController) = UIStoryboard.init(name: "First", bundle: nil).instantiateInitialViewController()as!UINavigationController
        
        let second:(UINavigationController) = UIStoryboard.init(name: "Second", bundle: nil).instantiateInitialViewController()as!UINavigationController
        
        let third:(UINavigationController) = UIStoryboard.init(name: "Third", bundle: nil).instantiateInitialViewController()as!UINavigationController
        
        let fourth:(UINavigationController) = UIStoryboard.init(name: "Fourth", bundle: nil).instantiateInitialViewController()as!UINavigationController
        
        let fifth:(UINavigationController) = UIStoryboard.init(name: "Fifth", bundle: nil).instantiateInitialViewController()as!UINavigationController
            tab.viewControllers = [first,second,third,fourth,fifth]
        self.window?.rootViewController = tab

        return true
    }

結束語：
本人編程剛上路的級別·····由于工作需要所以要學會swift，現在兩門語言同時啃·····如果哪里寫的不好望大神們賜教。小編我在這謝謝了！我非常想快速進步學習