StoryBoard用TabBar的oc、swift双语写法

对于我这个入门级小白来说研究了老半天才将oc的tabbar写法翻译成swift写法·····废话不多说现在开始。
我的思路是让tabbarcontroller做四个navigationcontroller的容器。
首先把工程里的mainstoryboard里的页面删掉，拖一个tabbarcontroller控件进来，并在右侧属性栏将该控件选择为初始页面（以initial·········为开头的选项）
然后建立第一个页面的storyboard，并将里面的navigationcontroller（没有的话就拖一个进来）设置成初始页面（和tabbarcontroller设置一样）并再拖一个tabbaritem（tabbar的按钮）到该navigationcontroller下。后面的个页面也是如此照做。代码都在appdelegate里写的。下面是代码

oc代码（四个页面）：

@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代码（这个是五个页面的）：

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
    }

结束语：
本人编程刚上路的级别·····由于工作需要所以要学会swift，现在两门语言同时啃·····如果哪里写的不好望大神们赐教。小编我在这谢谢了！我非常想快速进步学习