从场景中移除后如何停止 SKSpriteNode 的音频（Swift）？

Question

这是我的代码：

 override func didMoveToView(view: SKView) {
    /* Setup your scene here */
    let backgroundImage = SKSpriteNode(imageNamed: "Background.jpeg")
    backgroundImage.size = self.frame.size
    backgroundImage.position = CGPoint(x: self.frame.width / 2, y: self.frame.height / 2)
    backgroundImage.zPosition = 1
    self.addChild(backgroundImage)


    let addBugAction = SKAction.sequence([SKAction.runBlock({
        self.addBugsToScene()
    }), SKAction.waitForDuration(1)])
    self.runAction(SKAction.repeatActionForever(addBugAction))

}

func addBugsToScene() {

    let bug = SKSpriteNode(imageNamed: "Mos2.gif")
    bug.name = "Mosquito"


    //giving random position to and assigning to bugs
    let randomPoint = gettingRandomPosition(bug.size)
    bug.position = CGPoint(x: randomPoint.x, y: randomPoint.y)
    bug.zPosition = 12



    let blockOFaction = SKAction.runBlock({

        let randomMovingPoint = self.gettingRandomPosition(bug.size)

         let action = SKAction.moveTo(CGPoint(x: randomMovingPoint.x, y: randomMovingPoint.y), duration: 2)

        //action.speed = 3.0
        let movePlusSoundAction = SKAction.group([action,SKAction.playSoundFileNamed("MosquitoNoise.wav", waitForCompletion: false)])

        bug.runAction(movePlusSoundAction)

    })
    let waitAction = SKAction.waitForDuration(1)
    bug.runAction(SKAction.repeatActionForever(SKAction.sequence([blockOFaction, waitAction])))


    self.addChild(bug)

}



override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?)
    {        

   /* Called when a touch begins */

    for touch in touches {
        let location = touch.locationInNode(self)

        let touchedNode = self.nodeAtPoint(location)

        if touchedNode.name == "Mosquito"{

            touchedNode.removeAllActions()

            //touchNode.runAction(SKAction.Stop())

            //removing the bug which is tapped
            touchedNode.removeFromParent()
        }
    }
}

当我触摸节点（错误）时，它会从场景中移除。在这里，我试图停止播放与错误相关的音频。但即使在节点从场景中移除后，音频仍会继续播放。如何在节点从场景中移除后立即停止音频？

Answer 1

+ playSoundFileNamed:waitForCompletion: 只是播放一个声音。您无法控制正在播放的声音（无法暂停、取消暂停、停止等）。有人说您可以为声音动作指定一个键，然后通过移除该键来停止动作。到目前为止，这对我来说从来没有用过（在许多 iOS 版本上尝试过）。

此外，我用操作键尝试此技巧的最后一个 iOS 版本是 9.1...所以，有机会，您可以在 9.3 上尝试...

无论如何，这是来自文档：

Use SKAction playSoundFileNamed:waitForCompletion: only for short incidentals. Use AVAudioPlayer for long running background music. This action is not reversible; the reversed action is identical to the original action.

所以，它只是播放短音，仅此而已。

作为替代方案，您可以使用 SKAudioNode，但它仅适用于 iOS9 及更高版本。

Answer 2

下面是我如何编码以获得结果。

我在 addBugToScene() 中添加了以下代码

let mosquitoNoise = SKAudioNode(fileNamed: "MosquitoNoise.wav")
    mosquitoNoise.autoplayLooped = true
    mosquitoNoise.runAction(SKAction.changeVolumeTo(0.3, duration: 60))
    bug.addChild(mosquitoNoise)

//changes made here
 let movePlusSoundAction = SKAction.group([action,SKAction.runBlock({

            mosquitoNoise.runAction(SKAction.play())
            })])

        bug.runAction(movePlusSoundAction)

    })


 override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
   /* Called when a touch begins */

    for touch in touches {
        let location = touch.locationInNode(self)

        let touchedNode = self.nodeAtPoint(location)

        if touchedNode.name == "Mosquito"{

            //removes the SKAudioNode so audio will stop
            touchedNode.removeAllChildren()

            //removing the bug which is tapped
            touchedNode.removeFromParent()

        }

从场景中移除后如何停止 SKSpriteNode 的音频（Swift）？

How to stop an audio of SKSpriteNode after its removed from the scene(Swift)?

swift

sprite-kit

skspritenode

skaction

sknode