用手指手势移动精灵

Question

我试图移动雪碧(红点)，每当我移动我的手指在任何地方的屏幕上的设备。下面的代码似乎只在一个很小的不可见的圆圈内工作，而不是在屏幕的整个区域，这意味着精灵似乎遇到了某种墙，不再走得更远了。谁能弄清楚为什么？

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

不介意！

问题在于我不小心把我的雪碧锚定在现场，所以它的移动量不超过一定量。