SpriteKit创建按钮问题

import SpriteKit

class ButtonScene: SKScene {
    var button: SKSpriteNode!
    
    override func didMove(to view: SKView) {
        // 创建按钮外观
        let buttonTexture = SKTexture(imageNamed: "button_image")
        button = SKSpriteNode(texture: buttonTexture)
        button.position = CGPoint(x: size.width/2, y: size.height/2)
        addChild(button)
        
        // 创建按钮上的文本标签
        let label = SKLabelNode(text: "Click Me")
        label.fontColor = .white
        label.fontSize = 20
        label.position = CGPoint(x: 0, y: -10)
        button.addChild(label)
    }
    
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        for touch in touches {
            let location = touch.location(in: self)
            
            // 判断触摸点是否在按钮的范围内
            if button.contains(location) {
                // 改变按钮的外观以表示按钮被按下
                button.alpha = 0.8
            }
        }
    }
    
    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
        for touch in touches {
            let location = touch.location(in: self)
            
            // 判断触摸点是否在按钮的范围内
            if button.contains(location) {
                // 执行按钮的点击事件
                buttonClicked()
                
                // 恢复按钮的外观
                button.alpha = 1.0
            }
        }
    }
    
    func buttonClicked() {
        // 在这里实现按钮的点击事件
        print("Button clicked!")
    }
}