xcode 如何确保一次只播放一个视频？

deikduxw 于 2023-02-13 发布在其他

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我创建了一个AR应用程序，可以在特定的图像锚点上播放视频。我想扩展该应用程序以处理多个图像。现在，当我扫描第一个图像时，它会播放视频，当我扫描第二个图像时，它会播放另一个视频。这里出现的问题是两个视频同时播放。
守则：

func renderer(_ renderer: SCNSceneRenderer, nodeFor anchor: ARAnchor) -> SCNNode? {

    let node = SCNNode()
    
    if let imageAnchor = anchor as? ARImageAnchor {
        
        //below code needs to be duplicated in order to add more news
        
        if imageAnchor.referenceImage.name == "harrypotter" {
            
            let videoNode = SKVideoNode(fileNamed: "harrypotter.mp4")
            
            videoNode.play()
            
            let videoScene = SKScene(size: CGSize(width: 480, height: 360))
            
            videoNode.position = CGPoint(x: videoScene.size.width / 2, y: videoScene.size.height / 2)
            
            videoNode.yScale = -1.0
            
            videoScene.addChild(videoNode)
            
            
            let plane = SCNPlane(width: imageAnchor.referenceImage.physicalSize.width, height: imageAnchor.referenceImage.physicalSize.height)
            
            plane.firstMaterial?.diffuse.contents = videoScene
            
            let planeNode = SCNNode(geometry: plane)
            
            planeNode.eulerAngles.x = -.pi / 2
            
            node.addChildNode(planeNode)
            
        }

        if imageAnchor.referenceImage.name == "deatheater" {
         
         let videoNode = SKVideoNode(fileNamed: "deatheater.mp4")
            
            videoNode.play()
         
         let videoScene = SKScene(size: CGSize(width: 480, height: 360))
         
         videoNode.position = CGPoint(x: videoScene.size.width / 2, y: videoScene.size.height / 2)
         
         videoNode.yScale = -1.0
         
         videoScene.addChild(videoNode)
         
         
         let plane = SCNPlane(width: imageAnchor.referenceImage.physicalSize.width, height: imageAnchor.referenceImage.physicalSize.height)
         
         plane.firstMaterial?.diffuse.contents = videoScene
         
         let planeNode = SCNNode(geometry: plane)
         
         planeNode.eulerAngles.x = -.pi / 2
         
         node.addChildNode(planeNode)
         
     }

我尝试使用2个if条件，这有助于在特定图像锚点上播放视频。现在，当我扫描第一个图像时，它会播放视频，当我扫描第二个图像时，它会播放另一个视频。这里出现的问题是两个视频同时播放。我希望每当我播放另一个视频时，第一个视频都应自动停止。

xcode

来源：https://stackoverflow.com/questions/75422794/how-to-make-sure-that-only-one-video-will-be-played-at-a-time

1条答案

按热度按时间

des4xlb01#

欢迎您来到比利时！
以下是一些建议，可帮助您获得所需内容并改进代码。

创建一个函数来完成所有这些工作，而不是为每个图像复制代码。
跟踪当前正在播放的歌曲，以便停止播放。

我不熟悉这些API，但您会看到以下内容：

class Player
{
    private let rootNode = SCNNode()
    private var playingNode: SCNNode?

    func renderer(_ renderer: SCNSceneRenderer, nodeFor anchor: ARAnchor)
    {
        if let imageAnchor = anchor as? ARImageAnchor
        {
            if let newNode = playVideo(names: imageAnchor.referenceImage.name)
            {
                <inset code to stop playing 'playingNode' and remove it>

                playingNode = newNode
            }
        }
    }

    private func playVideo(named name: String) -> SCNNode?
    {
        guard <check if video file with 'name' exists> else { return nil }

        let videoNode = SKVideoNode(fileNamed: "\(name).mp4") 
        videoNode.play()
            
        let videoScene = SKScene(size: CGSize(width: 480, height: 360))
        videoNode.position = CGPoint(x: videoScene.size.width / 2,
                                     y: videoScene.size.height / 2)
        videoNode.yScale = -1.0
        videoScene.addChild(videoNode)
            
        let plane = SCNPlane(width: imageAnchor.referenceImage.physicalSize.width,
                             height: imageAnchor.referenceImage.physicalSize.height)
        plane.firstMaterial?.diffuse.contents = videoScene
         
        let planeNode = SCNNode(geometry: plane)
        planeNode.eulerAngles.x = -.pi / 2

        return planeNode
    }
}

祝你好运。

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xcode 如何确保一次只播放一个视频？

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