swift - 如果多次触摸，如何从父节点中删除节点？

Question

我正在制作一款游戏，当按下按钮时，子弹会射向坏人。我做了一个函数，每当它被调用时它都会添加更多的坏人。

代码如下:(多次调用该方法)

 func BadGuyPosition()
    let BadGuyCircle = SKSpriteNode(imageNamed: "CircleBadGuy")
    BadGuyCircle.zPosition = 1
    //var mininmum = self.size.width / 600
    let TooMuch = self.size.height - 60

    let PointToShow = UInt32(TooMuch)

    BadGuyCircle.position = CGPointMake(CGRectGetMaxX(self.frame) + 20 , CGFloat(arc4random_uniform(PointToShow) ))

    let action2 = SKAction.moveToX(-100, duration: 5.0)
    let remove = SKAction.removeFromParent()

    BadGuyCircle.runAction(SKAction.sequence([action2,remove]))

    //Physics BadGuy
    BadGuyCircle.physicsBody = SKPhysicsBody(rectangleOfSize: BadGuyCircle.size)
    BadGuyCircle.physicsBody?.categoryBitMask = Numbering.Badguy
    BadGuyCircle.physicsBody?.contactTestBitMask = Numbering.Laser
    BadGuyCircle.physicsBody?.affectedByGravity = false
    BadGuyCircle.physicsBody?.dynamic = true

    self.addChild(BadGuyCircle)

我想要这样，如果 2 颗子弹与坏人接触，坏人就会从父级中移除。

我知道当一颗子弹与敌人接触时，它会从父级中移除。 (这里是代码)

func didBeginContact(contact: SKPhysicsContact) {
    let A : SKPhysicsBody = contact.bodyA
    let B : SKPhysicsBody = contact.bodyB

    if (A.categoryBitMask == Numbering.Badguy) && (B.categoryBitMask == Numbering.Laser) || (A.categoryBitMask == Numbering.Laser) && (B.categoryBitMask == Numbering.Badguy)
    {

        runAction(BadGuyLostSound)
        bulletsTouchedBadGuy(A.node as! SKSpriteNode, Laser: B.node as! SKSpriteNode)

    }









}

func bulletsTouchedBadGuy(BadGuy: SKSpriteNode, Laser: SKSpriteNode){

    Laser.removeFromParent()
    BadGuy.removeFromParent()


}

任何人都可以告诉我我怎样才能使敌人从父级中移除需要不止一颗子弹。

Answer 1

删除冲突节点的最佳方法是使用方法 didFinishUpdate，如果您删除或启动从 didBeginContact 中删除节点的方法，您的游戏可能会崩溃搜索同时正在被删除的碰撞节点..

class BadGuy: SKSpriteNode {
   var badGuyBulletCollisionsCounter: Int = 0
   init() {
       let texture = SKTexture(imageNamed: "CircleBadGuy")
       super.init(texture: texture, color: nil, size: texture.size())
       ...
       // fill this part with your BadGuy code
   }
   required init(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
   }  
}

声明一个全局变量:

var nodesToRemove = [SKNode]()

在didBeginContact 方法中:

func didBeginContact(contact: SKPhysicsContact) {
    let A : SKPhysicsBody = contact.bodyA
    let B : SKPhysicsBody = contact.bodyB
    if (A.categoryBitMask == Numbering.Badguy) && (B.categoryBitMask == Numbering.Laser) || (A.categoryBitMask == Numbering.Laser) && (B.categoryBitMask == Numbering.Badguy)
    {
        badGuy = A.node as! BadGuy
        badGuy.badGuyBulletCollisionsCounter += 1
        runAction(BadGuyLostSound)
        bulletsTouchedBadGuy(badGuy, Laser: B.node as! SKSpriteNode)
    }
}

在 bulletsTouchedBadGuy 方法中:

func bulletsTouchedBadGuy(badGuy: BadGuy, laser: SKSpriteNode){
    nodesToRemove.append(laser)
    if badGuy.badGuyBulletCollisionsCounter == 2 {
       nodesToRemove.append(badGuy)
    }   
}

最后:

override func didFinishUpdate() 
{   
     nodesToRemove.forEach(){$0.removeFromParent()}   
     nodesToRemove = [SKNode]()
}