更改 UibezierPath 的半径 swift

Question

我画了一个圆弧，然后给它添加了动作。我怎样才能使用这个动作来改变圆弧的半径？？（示例：半径为 30，单击圆弧和 +10。再次单击和 -10）。我尝试更改半径但没有 result.While 这不会移动，我不太明白为什么会这样。

这是完整的 class 代码。

@IBDesignable class circleView: UIView {

    typealias ArcAction = () -> Void

    struct ArcInfo {
        var outlinePath: UIBezierPath
        var action: ArcAction
    }

    private var arcInfos: [ArcInfo]!

    let bgShapeLayer = CAShapeLayer()
     var redRadius: Float?


    required init?(coder: NSCoder) {
        super.init(coder: coder)

        let recognizer = UITapGestureRecognizer(target: self, action: #selector(tap(_ :)))
        addGestureRecognizer(recognizer)
    }

    override func draw(_ rect: CGRect) {

        let fullCircle = CGFloat.pi * 2
        let arcAngle = fullCircle * 1.5 / 6

        var lastArcAngle = CGFloat.pi / 4.0 + CGFloat.pi //-CGFloat.pi

        arcInfos = []


     // Red Arc
        func redArc( action: @escaping ArcAction) {

            let path = UIBezierPath(arcCenter: CGPoint(x: rect.width/2, y: rect.height/2), radius: CGFloat(redRadius ?? 46), startAngle: lastArcAngle, endAngle: lastArcAngle + arcAngle, clockwise: true)

            #colorLiteral(red: 0.7450980392, green: 0.007843137255, blue: 0.262745098, alpha: 1).setStroke()
            path.lineWidth = 10
            path.stroke()
            lastArcAngle += arcAngle

            // separators
            #colorLiteral(red: 0.927436769, green: 0.9490308166, blue: 0.967099607, alpha: 1).setStroke()
            let outlinePath = hitTestPath(for: path)
            outlinePath.lineWidth = 3
            outlinePath.stroke()

            arcInfos.append(ArcInfo(outlinePath: outlinePath, action: action))
        }

        //Add Arc
        redArc {
            self.redRadius = 56

        }

    }

    @objc func tap(_ recognizer: UITapGestureRecognizer) {
        let location = recognizer.location(in: self)

        if let hitPath = (arcInfos.first { [=11=].outlinePath.contains(location) }) {
            hitPath.action()
            print(hitPath)
        }
    }

    func hitTestPath(for path: UIBezierPath) -> UIBezierPath {
        let pathCopy = path.cgPath.copy(strokingWithWidth: 15, lineCap: .butt, lineJoin: .miter, miterLimit: 0)
        return UIBezierPath(cgPath: pathCopy)
    }
}

Answer 1

您需要触发 UI 更新...

    if let hitPath = (arcInfos.first { [=10=].outlinePath.contains(location) }) {
        hitPath.action()

        // add this line
        setNeedsDisplay()

        print(hitPath)
    }

注意：您的代码按原样以 46 的半径开始...点击添加该行后，它会以 56 的半径重绘自身。

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