SpriteKit创建按钮点击无响应 无法触发玩家跳跃动作问题求助

问题排查&修复方案 #

故障原因 #

• touchesBegan方法定义在didMove(to:)方法内部，属于局部函数，未作为GameScene的实例方法实现，系统无法触发触摸回调
• touchesBegan缺少override关键字，方法签名不符合SpriteKit的系统回调要求
• player、button是didMove(to:)内的局部变量，触摸方法无法跨作用域访问

修正后完整代码 #

import SwiftUI
import SpriteKit
import UIKit

class GameScene: SKScene {
    // 将player、button提升为类成员属性
    let button = SKSpriteNode(imageNamed: "playerOBJ")
    let player = SKSpriteNode(imageNamed: "playerOBJ")
    
    override func didMove(to view: SKView) {
        let playerRadius = player.frame.width / 2.0
        
        player.position = CGPoint(x: 200, y: 500)
        player.name = "Jimmy"
        
        addChild(player)
        
        player.physicsBody = SKPhysicsBody(circleOfRadius: playerRadius)
        player.physicsBody?.allowsRotation = false
        player.physicsBody?.friction = 0
        player.physicsBody?.restitution = 0
        player.zPosition = 100
        
        // Button
        button.name = "btn"
        button.size.height = 100
        button.size.width = 100
        button.position = CGPoint(x: 100, y: 100)
        self.addChild(button)
        
        // Physics
        physicsBody = SKPhysicsBody(edgeLoopFrom: frame.inset(by: UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)))
        
        Timer.scheduledTimer(withTimeInterval: 2, repeats: true) { [weak self] _ in
            self?.player.physicsBody?.applyForce(CGVector(dx: 100, dy: 1000))
        }
    }
    
    // 把touchesBegan移到类作用域，使用正确的方法签名
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        let touch = touches.first
        guard let positionInScene = touch?.location(in: self) else { return }
        let touchedNode = self.atPoint(positionInScene)

        if let name = touchedNode.name, name == "btn" {
            player.physicsBody?.applyForce(CGVector(dx: 0, dy: 10000))
        }
    }
    
    override func update(_ currentTime: TimeInterval) { }
}

内容的提问来源于stack exchange，提问作者Superbia