如何通过多次触摸消除脉冲(SpriteKit)

import SpriteKit

class GameScene: SKScene {
    var pulse: SKSpriteNode!
    var score: Int = 0
    
    override func didMove(to view: SKView) {
        // 创建脉冲精灵
        pulse = SKSpriteNode(imageNamed: "pulse")
        pulse.position = CGPoint(x: frame.midX, y: frame.midY)
        addChild(pulse)
    }
    
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        for touch in touches {
            let location = touch.location(in: self)
            
            // 判断触摸位置是否与脉冲精灵相交
            if pulse.contains(location) {
                // 从场景中移除脉冲精灵
                pulse.removeFromParent()
                
                // 增加得分或执行其他逻辑
                score += 1
                print("Score: \(score)")
            }
        }
    }
}