ReplayKit不适用于iOS示例SpriteKit项目代码

Question

我在Xcode中使用示例SpriteKit项目来测试ReplayKit，但它只显示普通应用程序而没有出现navigationItem.rightBarButtonItem。只是带有Hello, World!标签的黑屏。我不确定我错过了什么。以下是GameViewController课程详情。

import UIKit
import SpriteKit
import GameplayKit
import ReplayKit

class GameViewController: UIViewController, RPPreviewViewControllerDelegate {

 //weak var previewControllerDelegate: RPPreviewViewControllerDelegate?

override func viewDidLoad() {
    super.viewDidLoad()



    navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Start", style: .plain, target: self, action: #selector(startRecording))


    if let view = self.view as! SKView? {
        // Load the SKScene from 'GameScene.sks'
        if let scene = SKScene(fileNamed: "GameScene") {
            // Set the scale mode to scale to fit the window
            scene.scaleMode = .aspectFill

            // Present the scene
            view.presentScene(scene)
        }

        view.ignoresSiblingOrder = true

        view.showsFPS = true
        view.showsNodeCount = true

    }



}


func startRecording() {
    let recorder = RPScreenRecorder.shared()

    recorder.startRecording{ [unowned self] (error) in
        if let unwrappedError = error {
            print(unwrappedError.localizedDescription)
        } else {
            self.navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Stop", style: .plain, target: self, action: #selector(self.stopRecording))
        }
    }
}

func stopRecording() {
    let recorder = RPScreenRecorder.shared()

    recorder.stopRecording { [unowned self] (preview, error) in
        self.navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Start", style: .plain, target: self, action: #selector(self.startRecording))

        if let unwrappedPreview = preview {
            unwrappedPreview.previewControllerDelegate = self
            self.present(unwrappedPreview, animated: true)
        }
    }
}

func previewControllerDidFinish(_ previewController: RPPreviewViewController) {
    dismiss(animated: true)
}

override var shouldAutorotate: Bool {
    return true
}

override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
    if UIDevice.current.userInterfaceIdiom == .phone {
        return .allButUpsideDown
    } else {
        return .all
    }
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Release any cached data, images, etc that aren't in use.
}

override var prefersStatusBarHidden: Bool {
    return true
}
}