我有这个函数,我用它每秒在随机位置生成 Flower 对象:
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)
}
}
}
每次调用该函数时,我都会为flower创建一个新实例,但由于某种原因,当我调用如下函数时,它会给出错误:
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Attemped to add a SKNode which already has a parent:
spawnFlower() 函数每秒调用一次。第一次调用时它有效,第二次调用时它崩溃了。我做错了什么?
最佳答案
addChild() 调用需要移出 for 循环,以便 tempFlower
仅添加到其父级一次。
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)
}
}
关于arrays - swift 中的 "Attemped to add a SKNode which already has a parent",我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/46258881/