尝试添加已经有父级错误的 SKNode

我在尝试运行我的游戏时收到错误：“尝试添加已有父节点的 SKNode”。

如果我将 SKSpriteNode 在本地添加到函数中，它就可以正常运行。但是当我尝试在全球范围内声明它时，我收到了该错误。任何解决此错误的帮助都会很棒。我认为这与self.bee.removeFromParent()但我无法让它发挥作用。

let bee = SKSpriteNode(imageNamed: "Bee")

runAction(SKAction.repeatActionForever(
    SKAction.sequence([
        SKAction.runBlock(addBee),
        SKAction.waitForDuration(0.5)
        ])
    ))

func addBee() {

    bee.name = "Bee"
    let actualY = random(min: 0, max: siz    e.height+bee.size.height ) // random

    bee.position = CGPoint(x: size.width + bee.size.width/2, y: actualY)
    self.addChild(bee)

    let slopeToPlayer = (bee.position.y - player.position.y) / (bee.position.x - player.position.x)
    let constant = bee.position.y - slopeToPlayer * bee.position.x

    let finalX : CGFloat = bee.position.x < player.position.x ? 500.0 : -500.0 // Set it to somewhere outside screen size

    let finalY = constant +  slopeToPlayer * finalX

    let distance = (bee.position.y - finalY) * (bee.position.y - finalY) + (bee.position.x - finalX) * (bee.position.x - finalX)
    let beeSpeed = random(min: CGFloat(50), max: CGFloat(150))
    let timeToCoverDistance = sqrt(distance) / beeSpeed

    let moveAction = SKAction.moveTo(CGPointMake(finalX, finalY), duration: NSTimeInterval(timeToCoverDistance))
    let removeAction = SKAction.runBlock { () -> Void in
        self.bee.removeFromParent()
    }
    bee.runAction(SKAction.sequence([moveAction,removeAction]))


}

您不能添加相同的单个实例SKNode两次。这就像说一个人可以同时存在于两个地方一样。 当您创建Bee node在全球范围内，在addBee函数，您正在尝试添加相同的实例Bee一次又一次。

如果要添加多个节点，则应该创建节点的单独实例。这就是从函数内部本地创建它们的原因。

func addBee() {

    let bee = SKSpriteNode(imageNamed: "Bee")
    bee.name = "Bee"
    addChild(bee)
}

获取碰撞节点的参考。

func didBeginContact(contact: SKPhysicsContact) {

    var bodyA : SKPhysicsBody!
    var bodyB : SKPhysicsBody!

    if contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask
    {
        bodyA = contact.bodyA!
        bodyB = contact.bodyB!
    }
    else
    {
        bodyB = contact.bodyA!
        bodyA = contact.bodyB!
    }

    // The two nodes that have collided
    let node1 = bodyA.node 
    let node2 = bodyB.node

}