导航控制器未加载（推送、呈现）另一个视图控制器

Question

我无法在单击按钮时加载 viewController，因为我知道定义的 Vc 包含我要呈现的 VC 的值。

//AppDelegate
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.
    
    let mainViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(identifier: "ViewController") as! ViewController
    let navVC = UINavigationController.init(rootViewController: mainViewController)
    self.window?.rootViewController = navVC
    self.window?.makeKeyAndVisible()
    return true
}

 //ViewController Class
 class ViewController: UIViewController, UIScrollViewDelegate {

@IBOutlet weak var collectionView: UICollectionView!
@IBOutlet weak var button: UIButton!
@IBOutlet weak var pageController: UIPageControl!

private let reuseIdentifier = /*"CollectionViewCell"*/ "Cell"
let collectionViewImages : [UIImage] = [#imageLiteral(resourceName: "cooov"), #imageLiteral(resourceName: "shutterstock535739452"), #imageLiteral(resourceName: "portraitYoungManLyingBedCheckingHisFeverThermometer232147948490")]
let collectionViewTexts : [String] = [
    "Stay at home ! your health is our Priority",
    "Access Latest Coronavirus articles !",
    "Check up on your health on a daily basis !"
]

override func viewDidLoad() {
    super.viewDidLoad()
    renderButton()
    renderCell()
    pageController.numberOfPages = collectionViewImages.count
    pageController.currentPage = 0
}

@IBAction func buttonClicked(_ sender: UIButton) {
    let signupVC = UIStoryboard.init(name:"SignUp", bundle: nil).instantiateViewController(withIdentifier: "SignUp")
    as! SignUp
self.navigationController?.pushViewController(signupVC, animated: true)
}
 }


//SignUp class The VC that should appear on ButtonClick 
class SignUp : BaseViewController {
override func viewDidLoad() {
    super.viewDidLoad()
 }
}
 
 //the class that is inherited by ViewController
 class BaseViewController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()
    self.navigationController?.navigationBar.isHidden = true
 }
 }
[enter image description here][1]}

enter image description here

这里是提供的图片的链接，请检查。 https://drive.google.com/drive/folders/1CxysH911PIa3-S9Dx6EUV7DE8vlnEd4l?usp=sharing

Answer 1

你不需要新的 UINavigation 控制器来推送。

@IBAction func buttonClicked(_ sender: UIButton) {
    let signupVC = UIStoryboard.init(name:"SignUp", bundle: nil).instantiateViewController(withIdentifier: "SignUp")
        as! SignUp
    self.navigationController?.pushViewController(signupVC, animated: true)
}

此外，如果您使用 iOS 13.0+ 并使用 Xcode 11+，您的 SceneDelegate 将被调用而不是 AppDelegate。因此，请尝试将粘贴复制到 SceneDelegate。

Answer 2

这是你可以这样改变它的功能，让我知道结果

先运行这个

@IBAction func buttonClicked(_ sender: UIButton) {
        let signupVC = UIStoryboard.init(name:"SignUp", bundle: nil).instantiateViewController(withIdentifier: "SignUp")

        let navVC = UINavigationController.init(rootViewController: signupVC)
      //  self.present(navVC, animated: true, completion: nil)

        if let nav =  self.navigationController {
            nav.pushViewController(navVC, animated: true)
        } else {
            print("navigation controller not found")
        }
    }

然后尝试呈现......并让我知道发生了什么

@IBAction func buttonClicked(_ sender: UIButton) {
        let signupVC = UIStoryboard.init(name:"SignUp", bundle: nil).instantiateViewController(withIdentifier: "SignUp")

        let navVC = UINavigationController.init(rootViewController: signupVC)
        self.present(navVC, animated: true, completion: nil)


    }