在SpriteKit中将动态物理对象保持在手指之下

import SpriteKit

class GameScene: SKScene {
    var object: SKSpriteNode!
    
    override func didMove(to view: SKView) {
        // 创建物体
        object = SKSpriteNode(color: .red, size: CGSize(width: 50, height: 50))
        object.physicsBody = SKPhysicsBody(rectangleOf: object.size)
        object.physicsBody?.isDynamic = true
        addChild(object)
    }
    
    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
        // 获取手指的位置
        guard let touch = touches.first else { return }
        let touchLocation = touch.location(in: self)
        
        // 将物体位置设置为手指位置
        object.position = touchLocation
    }
    
    override func update(_ currentTime: TimeInterval) {
        // 将物体保持在手指下方
        guard let touchLocation = touches.first?.location(in: self) else { return }
        let moveAction = SKAction.moveTo(y: touchLocation.y, duration: 0.1)
        object.run(moveAction)
    }
}