Sprite kit 如何在特定命中后删除敌人？

我正在尝试在2次射击后删除一个敌人。这是我的开始

func didBegin(_ contact: SKPhysicsContact) {

    var body1:SKPhysicsBody
    var body2:SKPhysicsBody

    if contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask {
        body1 = contact.bodyA
        body2 = contact.bodyB
    }else{
        body1 = contact.bodyB
        body2 = contact.bodyA
    }


    if body1.categoryBitMask == PhysicsCatagory.Bullet && body2.categoryBitMask == PhysicsCatagory.Enemy{
        //if the bullet has hit the enemy
        if body2.node != nil {
            spawnSplatter(spawnPosition: body2.node!.position)
            body1.node?.removeFromParent()
            body2.node?.removeFromParent()
        }

func didbeagin（uu联系人：skphysiccontact）{
变量body1:SKPhysicsBody
变量body2:SKPhysicsBody
如果contact.bodyA.categoryBitMask

---

这会在被击中一次后删除一个敌人，有人能告诉我如何在两次击中后删除一个敌人吗？

通常，尝试将节点删除到

didbeagin（\ucontact:

这不是一个好主意，因为在第一次接触后，可能会有多个节点与变为零，这可能会导致崩溃

var bulletCounter : Int = 0
var nodesToRemove = [SKNode]()

func didBegin(_ contact: SKPhysicsContact) {
    var body1:SKPhysicsBody
    var body2:SKPhysicsBody
    if contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask {
        body1 = contact.bodyA
        body2 = contact.bodyB
    }else{
        body1 = contact.bodyB
        body2 = contact.bodyA
    }
    if body1.categoryBitMask == PhysicsCatagory.Bullet && body2.categoryBitMask == PhysicsCatagory.Enemy{
        //if the bullet has hit the enemy
        bulletCounter += 1
        nodesToRemove.append(body1.node!) // remove always the bullet
        switch bulletCounter {
        case 2: 
           nodesToRemove.append(body2.node!) // remove enemy
           bulletCounter = 0
        default:break 
        }
    }
}
override func didFinishUpdate()
{
    nodesToRemove.forEach(){$0.removeFromParent()}
    nodesToRemove = [SKNode]()
}

在游戏中获取/分配您的价值：

if let bulletCounter = self.userData?.object(forKey: "bulletCounter") {
   var counter = bulletCounter as! Int
   counter += 1
   self.userData?.setObject(counter, forKey: "bulletCounter" as NSCopying)
}

---

除了Alessandro所说的，这是可行的，你可以将一个SKSpriteNode子类化，并向它添加一些属性，称为能量或hp…也可以这样做。。。

if let bulletCounter = self.userData?.object(forKey: "bulletCounter") {
   var counter = bulletCounter as! Int
   counter += 1
   self.userData?.setObject(counter, forKey: "bulletCounter" as NSCopying)
}