该项目使用 ASDK（纹理）。有一个主节点，它有一个子节点，在某些情况下需要显示子节点的外边界，在这个项目中是通过添加一个边界节点来完成的UIGraphicsGetCurrentContext，并且任务是边界线宽相同在所有设备上，无论UIScreen.main.scale. 我做了一个测试代码，一切正常，除了下部和上部线的宽度小于侧线（显示正确）。请告诉如何解决？我无法传播整个屏幕的屏幕截图，但我上传了部分以便我可以显示问题所在。您可以在底线看到绿色，这不应该是。
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
}
}
更新 1：另一个例子
