从SceneDelegate加载视图时出现黑屏

Question

当我尝试加载此视图时，屏幕几乎黑屏。但是，如果我添加 view.backgroundColor = .red ，它将正确显示红色。只是我在情节提要中所做的设置不会显示。

这是我使用的代码：

import UIKit

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    var window: UIWindow?


     func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
   
    guard let _ = (scene as? UIWindowScene) else { return }

    
    
    guard let windowScene = scene as? UIWindowScene else { return }
    window = UIWindow(windowScene: windowScene)
    let mainStoryboard = UIStoryboard(name: "Main", bundle: nil)
    window?.rootViewController = mainStoryboard.instantiateViewController(withIdentifier: "ResultsViewController") as! ResultsViewController
    window?.makeKeyAndVisible()

    
}


import UIKit

class ResultsViewController: UINavigationController {

   
    override func viewDidLoad() {
          
        super.viewDidLoad()
        
view.backgroundColor = .blue
        
    }
    

}

Answer 1

您似乎已在情节提要中创建了diff_y[y_actual[:,]> 0 and y_predicted[:,0] <0] *=2。您必须从情节提要中加载它，才能将其设置为ResultsViewController。

rootViewController

注意：不要忘记在情节提要中将let mainStoryboard = UIStoryboard(name: "Main", bundle: nil) window?.rootViewController = mainStoryboard.instantiateViewController(withIdentifier: "ResultsViewController") as! ResultsViewController 的标识符设置为“ ResultsViewController”。