ios - 如何在 ios 中从 appdelegate 呈现不同的 View Controller

Question

实际上，我将导航 Controller 作为根 Controller 嵌入到 main.storyboard 中，我有两个屏幕，一个是登录屏幕，另一个是主页，根据登录凭据，我需要跳过登录屏幕，我需要显示主屏幕。来自appdelegate 我正在做这个跳过它不能正常工作

Unbalanced calls to begin/end appearance transitions for <UINavigationController: 0x7fadf384c600>.

 let storyboard=UIStoryboard.init(name: "Main", bundle: nil)
        let navigationController=storyboard.instantiateInitialViewController()
        let username=UserDefaultUtil.getString(key: AppConstants.PREF_USERID)
        print(username!)
        if username != ""
        {
            window?.rootViewController=navigationController
            let sectionController=SectionController(nibName: "SectionController" , bundle: nil)
            navigationController?.present(sectionController, animated: true, completion: nil)
        }

Answer 1

我猜你正试图在 navigationController 中呈现你的 sectionController，它不是真正的工作方式，试试这个代码:

let navigationController = self.storyboard?.instantiateInitialViewController() as! UINavigationController

并用这个替换现在的:

navigationController.setViewControllers([sectionController], animated: false)

或者只是放下 navigationController 实例化并使用代码创建它并将其设置为 window?.rootViewController:

let sectionController=SectionController(nibName: "SectionController" , bundle: nil)
let nav = UINavigationController(rootViewController: sectionController)
window?.rootViewController = nav