How to creat a custom LimitLine with two labels

[norman93sun]

now i want to custom a LimitLine with two labels

class CustomChartLimitLine: ChartLimitLine {
   
    @objc open var extraLabel = ""

    @objc public init(limit: Double, label: String, extraLabel: String) {
        super.init(limit: limit, label: label)
        self.extraLabel = extraLabel
    }
    
}

then creat custom XAxisRenderer

open class CustomXAxisRenderer: XAxisRenderer {
    open override func renderLimitLines(context: CGContext) {
// TODO: custom renderLimitLines
        super.renderLimitLines(context: context)
    }
}

and set chartView

view.xAxisRenderer = CustomXAxisRenderer(viewPortHandler: view.viewPortHandler, xAxis: view.xAxis, transformer: view.getTransformer(forAxis: .left))
let midLimit = CustomChartLimitLine(limit: yesterdayPrice, label: yesterdayPrice.fractionDigitsStr, extraLabel: "")
view.leftAxis.addLimitLine(midLimit)

after this renderLimitLines not called

Did I code it right? or anyone have a better idea