在app delegate中设置初始视图控制器时如何设置UITabBarController

Question

我需要以编程方式设置初始视图控制器（基于用户登录状态） 这是我的初始代码：

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let mainRootController = storyboard.instantiateViewControllerWithIdentifier("MainViewController") as UIViewController
if self.window != nil {

                let navigationController:UINavigationController = storyboard.instantiateInitialViewController() as UINavigationController
                navigationController.viewControllers = [mainRootController]

                self.window!.rootViewController = navigationController
}
return true

这会加载'MainViewController'。但我也错过了UITabBarController，我不知道如何在这里以编程方式设置它 有什么帮助吗？

Answer 1

试试这个：

    let tabBar = UITabBarController()
    tabBar.viewControllers = [navigationController]
    self.window!.rootViewController