swift - 用手指手势移动 Sprite

Question

每当我将手指移动到设备屏幕上的任何位置时，我都会尝试移动 Sprite (红点)。下面的代码似乎只在一个看不见的小圆圈内工作，而不是在屏幕的整个区域内工作，这意味着 Sprite 似乎遇到了某种墙壁并且不再继续前进。谁能找出原因吗？

import SpriteKit
import GameplayKit
var positionX  = CGFloat()
var positionY  = CGFloat()
var newPositionX = CGFloat()
var newPositionY = CGFloat()
var redDotPosition = CGPoint()
var oldPosition = CGPoint()
var newPosition = CGPoint()
class GameScene: SKScene {
var redDot : SKSpriteNode?

var entities = [GKEntity]()
var graphs = [String : GKGraph]()

private var lastUpdateTime : TimeInterval = 0
private var label : SKLabelNode?
private var spinnyNode : SKShapeNode?

override func sceneDidLoad() {

    redDot = childNode(withName: "redDot") as? SKSpriteNode
    redDot?.texture = SKTexture(imageNamed: "redDot")
    redDot?.position = CGPoint(x: frame.midX , y: frame.midX)



}


    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {

    for t in touches { self.touchMoved(toPoint: t.location(in: self))


        oldPosition = t.previousLocation(in: self)
        let oldPositionX = oldPosition.x
        let oldPositionY = oldPosition.y

        newPositionX = t.location(in: self).x
        newPositionY = t.location(in: self).y
        deltaX = newPositionX - oldPositionX
        deltaY = newPositionY - oldPositionY
        redDot?.position = CGPoint(x: redDot!.position.x + deltaX , y: redDot!.position.y + deltaY)


    }


}

Answer 1

没关系!

问题在于我不小心将我的 Sprite 锚定到了场景中，因此它的移动量没有超过一定的量。