没有使用SKAction删除精灵

Question

我正在尝试云向上移动并产卵，但我一直在努力

'因未捕获的异常而终止应用'NSInvalidArgumentException'，原因：'尝试添加已经拥有父级的SKNode：名称：'（null）'纹理：['CLOUD'（746 x 497）]位置：{198.66667175292969,1227.987060546875 } scale：{0.30,0.30} size：{223.80000305175781,149.10000610351562} anchor：{0.5,0.5} rotation：0.00'。 “

我不确定会出现什么问题，我会非常感谢任何帮助

 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()
    }
    }

}

Answer 1

cloud1和cloud2是属性，即在任何地方都可见。因此，当您执行addChild(cloud1)和addChild(cloud2)时，这些不是新创建的精灵，而是与之前添加的精灵相同，因此消息“尝试添加已有父级的SKNode”

在一个旨在生成节点的函数中，您通常每次都会创建一个新的SKNode，就像您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。

你也应该为cloud2做这个。

Answer 2

两件事，第一件是动作应该是一个序列。

   // let action = SKAction.repeat( block, count: 10)
     let action = SKAction.repeat( SKAction.sequence( [block,wait]), count: 10)

第二，时机应该在9s左右完美，即self.frame.height / 15

   //let moveCloud = SKAction.move(by: CGVector(dx:0, dy:25 * self.frame.width), duration: TimeInterval(self.frame.height / 15 ))

所以这可能是：

  let moveCloud = SKAction.move(by: CGVector(dx:0, dy:2.5 * self.frame.width), duration: TimeInterval(self.frame.height / 150 ))