UnityManager_unload.swift

class UnityManager: NSObject {
    
    ...
    private var hostMainWindow : UIWindow?

    func setHostMainWindow(_ hostMainWindow: UIWindow?) {
        self.hostMainWindow = hostMainWindow
    }
   
    func launchUnity() {
        let isInitialized = self.ufw?.appController() != nil
        if isInitialized {
            self.ufw?.showUnityWindow()
        } else {
            guard let ufw = self.loadUnityFramework() else { return }
            self.ufw = ufw
            ufw.setDataBundleId(dataBundleId)
            ✅ ufw.register(self)
            ufw.runEmbedded(
                withArgc: CommandLine.argc,
                argv: CommandLine.unsafeArgv,
                appLaunchOpts: nil
            )
        }
    }

    func closeUnity() {
        self.ufw?.unloadApplication()
    }
    ...
}

extension UnityManager: UnityFrameworkListener {
    
    func unityDidUnload(_ notification: Notification!) {
        self.ufw?.unregisterFrameworkListener(self)
        self.ufw = nil
        self.hostMainWindow?.makeKeyAndVisible()
    }
}