这个问题通常与辅助功能有关。您可以确保在AppDelegate的didFinishLaunchingWithOptions函数中启用了辅助功能。例如：

import UIKit

@UIApplicationMain class AppDelegate: UIResponder, UIApplicationDelegate {

var window: UIWindow?

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

    // 启用辅助功能
    UIAccessibility.requestGuidedAccessSession(enabled: true) { [unowned self] (bool) in
        guard bool == true else { return }
        self.window?.rootViewController?.becomeFirstResponder()
    }
    
    return true
}

}

这样，您就应该能够找到AXFocusedUIElement了。