Ios UIGraphicsGetCurrentContext的上下线颜色不正确

该项目使用ASDK（纹理）。有一个主节点，它有一个子节点，在某些情况下有必要显示子节点的外部边界，在本项目中，通过添加一个边界节点和

UIGraphicsGetCurrentContext

，并且任务是在所有设备上使边界线宽相同，而不管

UIScreen.main.scale

。我做了一个测试代码，一切正常，除了上下两行的宽度比边线小（显示正确）。请告诉我怎么修？我不能传播整个屏幕的截图，但我上传了部分，这样我可以显示问题是什么。您可以在底线上看到绿色，这不应该是

更新1：另一个示例

---

我相信你看到的是一个中风伪影。我知道如何避免它们的唯一方法是构建一条与您希望笔划形状对应的路径，并使用

fill

（因此，您将填充对象层叠在一起，而不仅仅是笔划基本路径）

private func enableEditingMode() {
        let solidBorderStyle = BorderStyle.solid
        let border = ASBorderNode(shapeType: self.shapeType, borderType: solidBorderStyle)
        border.frame = ASBorderNode.calculateFrame(self.shapeType, borderType: solidBorderStyle, superView: frame)
        supernode?.insertSubnode(border, at: 0)
    }

enum BorderStyle {
    case dashed
    case solid
    case solidLight

    var lineWidth: CGFloat {
        switch self {
        case .dashed:
            return 1
        case .solid:
            return 6 / UIScreen.main.scale
        case .solidLight:
            return 2
        }
    }

}

class ASBorderNode: ASDisplayNode {

    private (set) var shapeType: TemplateLayoutElement.Shape?
    private (set) var borderType: BorderStyle


    init(shapeType:TemplateLayoutElement.Shape?, borderType:BorderStyle = .dashed) {
        self.borderType = borderType
        self.shapeType = shapeType
        super.init()
        self.isOpaque = false
    }

    class func calculateFrame(_ shapeType: TemplateLayoutElement.Shape?, borderType: BorderStyle, superView frame: CGRect) -> CGRect {
        switch borderType {
        case .solid:
            let lineWidth = borderType.lineWidth //* UIScreen.main.scale
            let widthHeightValue = lineWidth * 2
            return CGRect(x: -lineWidth + frame.origin.x, y: -lineWidth + frame.origin.y, width: frame.width + widthHeightValue, height: frame.height + widthHeightValue)
        default:
            assertionFailure("Implement for specific style")
            return .zero
        }
    }

    override class func draw(_ bounds: CGRect, withParameters parameters: Any?, isCancelled isCancelledBlock: () -> Bool, isRasterizing: Bool) {
        if let context = UIGraphicsGetCurrentContext(),
            let parameters = parameters as? ASBorderNode {

            switch parameters.borderType {
            case .dashed:
                break
            case .solid:
                context.setStrokeColor(UIColor.black.withAlphaComponent(0.5).cgColor)
                context.setFillColor(UIColor.clear.cgColor)
                context.setLineWidth(parameters.borderType.lineWidth)
            case .solidLight:
                break
            }

            switch parameters.shapeType {
            case .circle?:
                break
            default:
                switch parameters.borderType {
                case .solid:
                    debugPrint("Bounds", bounds)
                    let frame = bounds.insetBy(dx: parameters.borderType.lineWidth / UIScreen.main.scale, dy: parameters.borderType.lineWidth / UIScreen.main.scale)
                    debugPrint("insetBy", frame)
                    context.addRect(frame)
                default:
                    break
                }
            }

            context.strokePath()
        }
    }

    override func drawParameters(forAsyncLayer layer: _ASDisplayLayer) -> NSObjectProtocol? {
        return self
    }

}