ios - 模态视图 Controller 状态恢复 SceneDelegate

Question

我正在尝试从 SceneDelegate 中恢复模态 Viewcontroller。

然而，此代码不允许模态视图 Controller 显示并导致以下错误: “对...的开始/结束外观转换的调用不平衡”。

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {

    if let userActivity = connectionOptions.userActivities.first ?? session.stateRestorationActivity {
        // Restoring Data and Modal VC:

        let storyboard = UIStoryboard(name: "Main", bundle: .main)
        let splitController =  storyboard.instantiateViewController(withIdentifier: "splitVC") 
        if let navigationController = window?.rootViewController as? UINavigationController {
             splitController.modalPresentationStyle = .fullScreen
             self.window?.makeKeyAndVisible()
             navigationController.present(splitController, animated: false, completion: nil)
        }
    } else {
        print("No User Activity")
        // Loads Initial VC
    }

}

有关如何解决此问题并从 SceneDelegate 中呈现模态 Viewcontroller 的任何想法

Answer 1

当您尝试加载一个新的 UIViewController 之前呈现它的人完成动画时，就会发生这种情况。您应该简单地在主线程上异步调用演示文稿:

DispatchQueue.main.async {
navigationController.present(splitController, animated: false, completion: nil)
}