Swift Sprite套件开始触摸功能

Question

我在处理一个xcode项目，当我触摸它时，我试图让一个红球SKShapeNode四处移动。我自己在触摸开始类中的源代码没有起到作用。我的代码有什么缺陷，我需要做什么来修复它。

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，这真是一个有趣的球，if touchLocation == ball.position如果你能准确地击中球的像素位置，我会印象深刻。你想要的是：

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

但就我个人而言，我要做的是创建SKSpriteNode的一个子类，并在这个孩子的触摸例程