how to get a custom legend

[wzio]

I subclass the ChartLegendRenderer , but how to use it. I notice that the legendRenderer is readonly

/// \returns  the Legend object of the chart. This method can be used to get an instance of the legend in order to customize the automatically generated Legend.
@property (nonatomic, readonly, strong) ChartLegend * __nonnull legend;

/// \returns  the renderer object responsible for rendering / drawing the Legend.
@property (nonatomic, readonly, strong) ChartLegendRenderer * __null_unspecified legendRenderer;

[liuxuan30]

@danielgindi is this another class you want to make public?
@stardust139 the bottom line is, you could subclass a chart view, and pass your legend renderer in initialize()

[wzio]

yeah， I found that . but a little precious to this

[vojto]

_legendRenderer is set to internal, so you can't replace it from a subclass...

Here's a KVC solution for replacing the legend with custom legend:

public class CustomCombinedChartView: CombinedChartView {
    override public func initialize() {
        super.initialize()
        
        let customLegend = CustomLegendRenderer(viewPortHandler: viewPortHandler, legend: self.legend)
        self.setValue(customLegend, forKey: "_legendRenderer")
    }
}

[wzio]

_legendRenderer is not a @objc property in Swift 4.0, so KVC is not work