从storyboard swift 5查看标签栏控制器

Question

我正在开发 swift 5 和 xcode 11.5

如果用户已登录，我正在尝试将用户从主故事板移动到标签栏控制器，

在我的 appDelegate 中我尝试了这个

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，如果有则移动到标签栏 如果没有显示主故事板 但即使有令牌，它也总是会转到 main.storyboard！

Answer 1

试试这个代码

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
}