Swift Sprite Kit 开启触控功能

Question

我在搞一个 xcode 项目，我试图让一个红球 SKShapeNode 在我触摸它时四处移动。我自己在触摸开始类中的源代码没有做到这一点。我的代码有什么缺陷，我需要做什么才能修复它。

import SpriteKit

class GameScene: SKScene {

    //Rectangle Skeletions
    var leftWallRect = CGRect(x: 0, y: 0, width: 40, height: 1000)

    var ball = SKShapeNode(circleOfRadius: 25);


    override func didMoveToView(view: SKView) {

        // Declare the Sprites in your scene
        var ball = SKShapeNode(circleOfRadius: 25);
        let leftWall = SKShapeNode(rect: leftWallRect);
        let rightWall = SKShapeNode(rect: leftWallRect);
        let pin = SKSpriteNode(imageNamed: "pin");

        // Ball Properties
        ball.strokeColor = UIColor.blackColor()
        ball.fillColor = UIColor.redColor()
        ball.position = CGPointMake(self.frame.width / 2 , self.frame.height / 4 - 100 )
        self.addChild(ball)

        // Left Wall Properties
        leftWall.fillColor = UIColor.purpleColor()
        leftWall.strokeColor = UIColor.blackColor()
        leftWall.position = CGPointMake(self.frame.size.width / 3 - 45, self.frame.size.height / 2 - 400)
        self.addChild(leftWall)

        //Right Wall Properties
        rightWall.fillColor = UIColor.purpleColor()
        rightWall.strokeColor = UIColor.blackColor()
        rightWall.position = CGPointMake(self.frame.size.width / 2 + 175, self.frame.size.height / 2 - 400)
        self.addChild(rightWall)
    }

    override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
        /* Called when a touch begins */

        let touch = touches.first as! UITouch
        let touchLocation = touch.locationInNode(self)

        if touchLocation == ball.position{

            ball.position = touchLocation

            println("Touches");
        }
    }

    override func update(currentTime: CFTimeInterval) {
        /* Called before each frame is rendered */
    }
}

Answer 1

LOL 哇，这很有趣，if touchLocation == ball.position 如果您能击中球的确切像素位置，我会印象深刻。你想要的是这个:

let touch = touches.first as! UITouch
let touchLocation = touch.locationInNode(self)
let touchedNode = self.nodeAtPoint(touchLocation)
if touchedNode == ball{
...

但就个人而言，我会做的是创建一个 SKSpriteNode 的子类，并在这个 child 的触摸例程中编写你的球的触摸代码