Swift 3/SpriteKit - 用手指绘制独立的形状

Question

我是初学者，正在学习 here 在 Swift 中绘制形状的教程。

import SpriteKit

class GameScene: SKScene {

    var activeSlice: SKShapeNode!
    var activeSlicePoints = [CGPoint]()

    override func didMove(to view: SKView) {
        createSlices()
    }

    func createSlices() {
        activeSlice = SKShapeNode()
        activeSlice.strokeColor = UIColor(red: 1, green: 0.9, blue: 0, alpha: 1)
        activeSlice.lineWidth = 9
        addChild(activeSlice)
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesBegan(touches, with: event)
        if let touch = touches.first {
            let location = touch.location(in: self)
            activeSlicePoints.append(location)
            redrawActiveSlice()
        }
    }

    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
        guard let touch = touches.first else { return }
        let location = touch.location(in: self)
        activeSlicePoints.append(location)
        redrawActiveSlice()

    }

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

    func redrawActiveSlice() {
        let path = UIBezierPath()
        path.move(to: activeSlicePoints[0])
        for i in 1 ..< activeSlicePoints.count {
            path.addLine(to: activeSlicePoints[i])
        }
        activeSlice.path = path.cgPath
    }
}

使用此代码，当您松开手指然后再次触摸进行绘制时，您会得到一条连接两个形状的线。我想画独立的形状。也许通过修改代码，让每个 touchesEnded() 的实例，表示形状的点数组存储在一个多维数组中，并为 touchesBegan() 的每个新实例创建一个点数组？

感谢您的帮助。

Answer 1

有点像

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

     createSlices()
}

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