情节提要swift 5中的视图选项卡栏控制器

Question

我正在开发swift 5和xcode 11.5

如果用户已登录，我正尝试将其从主故事板移动到选项卡栏控制器，

在我的appDelegate中，我尝试过此操作

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

        if let api_token = helper.getApiToken() {
            print("api_token: \(api_token)")
            
            let tab = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(identifier: "maintab")
            window?.rootViewController = tab
        }
        
        return true
    }

这里我要检查是否有用户api_token，如果是，请移至标签栏如果没有显示主故事板但是即使有令牌，它也总是转到main.storyboard！

Answer 1

尝试此代码

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

    if let api_token = helper.getApiToken() {
        print("api_token: \(api_token)")

        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let tab = storyboard.instantiateViewController(withIdentifier: "maintab")
        window?.rootViewController = tab
    }

    return true
}