Swift 2，SpriteKit，我在从父节点中删除节点时遇到问题

Question

我是Swift的新手，所以如果这让我感到困惑，请原谅。

我正在尝试让我的一个节点“芭乐”消失时，“忍者”与它相撞。

目前，我在createScene()函数中设置的代码如下：

        func spawnGuava(){

        //The way the Guava spawn and move

        let guavaNode = SKNode()

        let guava = SKSpriteNode(texture: guavaNodeTexture)

        guava.setScale(0.75)
        guava.position = CGPointMake (self.size.width + 160, self.size.height * 0.05)
        guava.physicsBody = SKPhysicsBody(rectangleOfSize: guava.size)
        guava.physicsBody?.affectedByGravity = false
        guava.physicsBody?.dynamic = true
        guava.alpha = 0.75
        guava.physicsBody?.categoryBitMask = PhysicsCatagory.Guava
        guava.physicsBody?.collisionBitMask = PhysicsCatagory.None
        guava.physicsBody?.contactTestBitMask = PhysicsCatagory.Ninja

        guava.zPosition = 0

        guavaNode.addChild(guava)


        guava.runAction(GuavaMoveAndRemove)

        self.addChild(guavaNode)

        func ninjaAteGuava(ninja: SKSpriteNode, guava: SKSpriteNode){

            guavaNode.removeFromParent()

        }

        func didCollideWithGuava(contact: SKPhysicsContact){
            var firstBody: SKPhysicsBody
            var secondBody: SKPhysicsBody

            if contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask{
                firstBody = contact.bodyA
                secondBody = contact.bodyB
            }
            else{
                firstBody = contact.bodyB
                secondBody = contact.bodyA
            }

            if ((firstBody.categoryBitMask & PhysicsCatagory.Guava != 0) && (secondBody.categoryBitMask & PhysicsCatagory.Ninja != 0)) {
                ninjaAteGuava(firstBody.node as! SKSpriteNode, guava: secondBody.node as! SKSpriteNode)

            }
        }

这里有一些关于忍者的信息

  let ninjaTexture = SKTexture(imageNamed:"ninja")
    ninjaTexture.filteringMode = SKTextureFilteringMode.Nearest

    ninja = SKSpriteNode(texture: NinjaTexture)
    ninja.setScale(0.5)
    ninja.position = CGPoint(x: self.frame.size.width * 0.50, y: self.frame.size.height * 0.6)

    ninja.physicsBody = SKPhysicsBody(circleOfRadius: ninja.size.height / 2)
    ninja.physicsBody?.categoryBitMask = PhysicsCatagory.Ninja
    ninja.physicsBody?.collisionBitMask = PhysicsCatagory.Ground |  PhysicsCatagory.Wall | 
    ninja.physicsBody?.contactTestBitMask = PhysicsCatagory.Ground | PhysicsCatagory.Wall | PhysicsCatagory.Guava
    ninja.physicsBody!.dynamic = true
    ninja.physicsBody!.allowsRotation = false

    self.addChild(ninja)

额外信息：

struct PhysicsCatagory {

static let None : UInt32 = 0
static let Boognish : UInt32 = 0x1 << 1
static let Ground : UInt32 = 0x1 << 2
static let Wall : UInt32 = 0x1 << 3
static let Guava : UInt32 = 0x1 << 4
static let Pepper: UInt32 = 0x1 << 5

}

Answer 1

在ninjaAteGuava function中，guavaNode应为guava

func ninjaAteGuava(ninja: SKSpriteNode, guava: SKSpriteNode){

        guavaNode.removeFromParent()

}

应该是：

func ninjaAteGuava(ninja: SKSpriteNode, guava: SKSpriteNode){

        guava.removeFromParent()

}

这是因为函数中的参数是芭乐，而不是guavaNode。我不知道为什么Xcode没有给您一个错误，但这应该可以工作。希望这能有所帮助。

Answer 2

是否已将guavaNode添加到场景或guava中？因为您正在从场景中删除guavaNode，但我怀疑您可能已将guava添加到guava.runAction(GuavaMoveAndRemove)内的场景中

或者可能在该操作中有其他东西可能会触发您的bug？