尝试劫持根视图控制器时收到SIGABRT错误

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    window = UIWindow(frame: UIScreen.main.bounds)
    window?.rootViewController = YourRootViewController()
    window?.makeKeyAndVisible()
    return true
}

if window?.rootViewController == nil {
    window?.rootViewController = YourRootViewController()
}

let newViewController = NewViewController()
self.navigationController?.pushViewController(newViewController, animated: true)

import UIKit

@main
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        window = UIWindow(frame: UIScreen.main.bounds)
        
        if let rootViewController = window?.rootViewController {
            // 如果已经设置了根视图控制器，则不需要再次设置
            return true
        }
        
        window?.rootViewController = YourRootViewController()
        window?.makeKeyAndVisible()
        return true
    }
}