How to properly subclass XAxis?

[bardonadam]

I made a subclass of the XAxis:

class CustomXAxis: XAxis {
// empty, no custom implementation yet
}

And assigned it to my renderer:

let xAxis = CustomXAxis()
barChart.xAxisRenderer = CustomXAxisRenderer(viewPortHandler: barChart.viewPortHandler, xAxis: xAxis, transformer: barChart.getTransformer(forAxis: .left))

The problem is that my renderer overrides computeSize() function, but it has no/incorrect effect on xAxis height. When I initialize my renderer with barChart.xAxis instead of my custom one, it works as expected.

Is there anything left to do when subclassing XAxis?

[LeeCenY]

OC project, ask how to inherit xAxisRenderer
Error message: Cannot subclass a class that was declared with the 'objc_subclassing_restricted' attribute

[liuxuan30]

@objc(ChartXAxis)
open class XAxis: AxisBase
{

you should be clear to subclass it.