“Attemped添加已经具有父SKNode”斯威夫特

Question

我有这个功能，我使用生成花随机的位置的物体每秒：

func spawnFlower() { 
    //Create flower with random position 
    let tempFlower = Flower() 
    let height = UInt32(self.size.height/2) 
    let width = UInt32(self.size.width/2) 
    let randomPosition = CGPoint(x: Int(arc4random_uniform(width)), y: Int(arc4random_uniform(height))) 
    tempFlower.position = randomPosition 

    var tooClose = false 
    flowerArray.append(tempFlower) 

    // enumerate flowerArray 
    for flower in flowerArray { 

     // get the difference in position between the current node 
     // and each node in the array 
     let xPos = abs(flower.position.x - tempFlower.position.x) 
     let yPos = abs(flower.position.y - tempFlower.position.y) 

     // check if the spawn position is less than 10 for the x or y in relation 
     // to the current node in the array 
     if (xPos < 10) || (yPos < 10) { 
      tooClose = true 
     } 

     if tooClose == false { 
      //Spawn node 
      addChild(tempFlower) 
     } 
    } 
} 

我创造了花一个新的实例每一次函数被调用，但由于某种原因，当我调用该函数类似下面，它给我的错误：

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Attemped to add a SKNode which already has a parent: 

的spawnFlower（）函数被调用每一秒。它第一次被调用，第二次崩溃。我究竟做错了什么？

Answer 1

addChild（）调用需要移出for循环，因此tempFlower仅被添加到其父项中。

func spawnFlower() { 
    //Create flower with random position 
    let tempFlower = Flower() 
    let height = UInt32(self.size.height/2) 
    let width = UInt32(self.size.width/2) 
    let randomPosition = CGPoint(x: Int(arc4random_uniform(width)), y: Int(arc4random_uniform(height))) 
    tempFlower.position = randomPosition 

    var tooClose = false 
    flowerArray.append(tempFlower) 

    // enumerate flowerArray 
    for flower in flowerArray { 

     // get the difference in position between the current node 
     // and each node in the array 
     let xPos = abs(flower.position.x - tempFlower.position.x) 
     let yPos = abs(flower.position.y - tempFlower.position.y) 

     // check if the spawn position is less than 10 for the x or y in relation 
     // to the current node in the array 
     if (xPos < 10) || (yPos < 10) { 
      tooClose = true 
     } 
    } 

    if tooClose == false { 
     // Spawn node 
     addChild(tempFlower) 
    } 
}