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ios - sprite not being removed with SKAction

问题描述

I am trying clouds move up and spawn but I keep getting

'terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Attemped to add a SKNode which already has a parent: name:'(null)' texture:[ 'CLOUD' (746 x 497)] position:{198.66667175292969, 1227.987060546875} scale:{0.30, 0.30} size:{223.80000305175781, 149.10000610351562} anchor:{0.5, 0.5} rotation:0.00'. '

I'm not sure what's going wrong any help would be much appreciated 

 let cloud1 = SKSpriteNode(imageNamed: "CLOUD")
 let cloud2 = SKSpriteNode(imageNamed: "CLOUD")

class GameScene: SKScene {

override func didMove(to view: SKView) {
          self.anchorPoint = CGPoint(x: 0.5, y: 0.5)
 setUp()
}

func setUp() {

    let block = SKAction.run ({
        self.spawnClouds()

        if (cloud1.position.y  > self.size.height) {

        cloud1.removeFromParent()
            cloud2.removeFromParent()
        }
    })

    let wait = SKAction.wait(forDuration: 9)

    let action = SKAction.repeat(block, count: 10)
            let removes = SKAction.removeFromParent()

    let sequence = SKAction.sequence([block, wait, action, removes])

    self.run(sequence)
}

@objc func spawnClouds() {
    let gapHeight = self.frame.width / 9
    let movementAmount = arc4random() % UInt32(self.frame.width / 2)
    let cloudOffset = CGFloat(movementAmount) - self.frame.width / 4

   // let cloud1 = SKSpriteNode(imageNamed: "CLOUD")

    cloud1.xScale = 0.3
    cloud1.yScale = 0.3
    cloud1.zPosition = 1
    self.addChild(cloud2)
    cloud2.xScale = 0.3
    cloud2.yScale = 0.3
    cloud2.zPosition = 1

    cloud1.position = CGPoint(x:self.frame.minX / 2 + gapHeight / 5 + cloudOffset , y: self.frame.minY  )
    cloud2.position = CGPoint(x:self.frame.maxX / 2 + gapHeight / 5 + cloudOffset , y: self.frame.minY  )

    self.addChild(cloud1)

    var distanceToMove = CGFloat(self.frame.size.width + 2.0 * cloud1.frame.width)
    let moveCloud = SKAction.move(by: CGVector(dx:0, dy:25 * self.frame.width), duration: TimeInterval(self.frame.height / 15 ))

    let newaction = SKAction.removeFromParent()
    let new = SKAction.sequence([moveCloud, newaction])

    cloud1.run(new)
    cloud2.run(new)
}

override func update(_ currentTime: TimeInterval) {

    if cloud2.position.y > size .height {

        cloud1.removeFromParent()
        cloud2.removeFromParent()
    }
    }

}

标签： iosswiftsprite-kitskaction

解决方案

cloud1 和 cloud2 是属性，即随处可见。因此，当您这样做时addChild(cloud1)，addChild(cloud2)这些不是新创建的精灵，而是您之前添加的精灵，因此出现消息“尝试添加已经有父节点的 SKNode”

在设计用于生成节点的函数中，您通常会创建一个新的 SKNode 来每次生成，就像注释掉的代码行一样：

// let cloud1 = SKSpriteNode(imageNamed: "CLOUD")

这将确保 cloud1 每次都是一个新节点。

您也应该为 cloud2 执行此操作。

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