Question

所以我有以下代码，用didBegin:contact

内设置的玩家两枪击杀敌人

var bulletCounter : Int = 0 //not declared inside didbegin just to be clear
nodesToRemove = [SKNode]() // not declared inside didbegin just to be clear       

if body1.categoryBitMask == PhysicsCatagory.Bullet && body2.categoryBitMask == PhysicsCatagory.Enemy && (body2.node?.position.y)! < self.size.height{
                //if the bullet has hit the enemy
                bulletCounter += 1
                nodesToRemove.append(body1.node!) // remove bullet always
                switch bulletCounter {
                case 2:
                    nodesToRemove.append(body2.node!) // remove enemy
                    bulletCounter = 0
                    addScore()
                default:break
                }

接下来是

 override func didFinishUpdate()

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

现在我的问题是，一旦玩家触及射手节点并使其持续10秒左右，我怎么能创造某种即时杀戮，1个子弹来杀死而不是2

Answer 1

A＆＃39;一次性杀人＆＃39;很容易实现，因为没有必要记住目标已被击中并在每次击中时检查它。

var bulletCounter : Int = 0 //not declared inside didbegin just to be clear
nodesToRemove = [SKNode]() // not declared inside didbegin just to be clear       

if body1.categoryBitMask == PhysicsCatagory.Bullet &&
    body2.categoryBitMask == PhysicsCatagory.Enemy &&
    (body2.node?.position.y)! < self.size.height {
        //The bullet has hit the enemy, so remove both and update the score
    body1.node.removeFromParent()
    body2.node.removeFromParent()
    addScore()
    }

EDIT使用SKSpriteNode子类的灵活解决方案

好的 - 如果我们将子弹＆amp;敌人，我们可以拥有能够做更多（或更少伤害）的子弹，拥有更多或更少健康的敌人等，所有这些都被各个节点整齐地跟踪。

以下是我们的新bullet课程：

import Foundation
import SpriteKit

class Bullet: SKSpriteNode {

    var damageInflicted = 2 
    var health = 1  { // Possibility for some bullets to be stronger
       didSet {
             if health == 0 {
                removeFromParent()
             }
       }
}

这是我们的新敌人：

import Foundation
import SpriteKit

class Enemy: SKSpriteNode {

    var health = 2 {
       didSet {
             if health == 0 {
                removeFromParent()
             }
       }
     var pointValue = 100  // Points for destroying
}

您的代码现在变为：

if body1.categoryBitMask == PhysicsCatagory.Bullet && body2.categoryBitMask == PhysicsCatagory.Enemy && (body2.node?.position.y)! < self.size.height{
     // The bullet has hit the enemy
     let enemyNode = contact.bodyA.categoryBitMask == PhysicsCatagory.Enemy ? contact.bodyA.node as! Enemy : contact.bodyB.node as! Enemy
     let bulletNode = contact.bodyA.categoryBitMask == PhysicsCatagory.Bullet ? contact.bodyA.node as! Bullet : contact.bodyB.node as! Bullet
     enemyNode.health -= bulletNode.damageInflicted
     bulletNode.health -= 1 
     addScore(enemyNode.pointValue)
     }

你可以更新单个子弹和敌人＆＃39; damageInflicted和health视需要。

子弹和敌人将初始化为：

scoreValues

和

let bullet = Bullet(imageNamed: "bullet")

代替： let enemy = Enemy(imageNamed: "enemy1")等。

返回SKNode且通常有let bullet = SKSpriteNode(imageNamed: "bullet")的函数现在将改为... as SKSpriteNode和as bullet。

SpriteKit

1 个答案: