CombinedChartView Legend only shows line data info not info for other types

[robertschmid23]

I have created a CombinedChartView with lineDataSets and CandleDataSets. The CandleDataSets are used to highlight certain data points.

This has all worked fine except for the Legend. When I enable the legend it only shows legend information for the LineDataSets.

I looked into the LegendRenderer and discovered the problem arises here ->

@objc open func computeLegend(data: ChartData)
{
    guard let legend = legend else { return }

    if !legend.isLegendCustom
    {
        var entries: [LegendEntry] = []

        // loop for building up the colors and labels used in the legend
        for i in 0..<data.dataSetCount
        ...

The dataSetCount only counts lineDataSets and ignores the candleDataSet. So any data sets after the line data are ignored.

My setup looks like this;

self.chartView.data = CombinedChartData()

if let chartView = self.chartView
{
    let allData = CombinedChartData()
    allData.lineData = LineChartData()
    for line in lineData.values
    {
        if line.isVisible
        {
            allData.lineData.addDataSet(line)
        }
    }
    allData.candleData = CandleChartData()
    for fiducialMark in buttonData.values
    {
        if fiducialMark.isVisible
        {
            allData.candleData.addDataSet(fiducialMark)
        }
    }
    chartView.data = allData
    chartView.chartDescription?.text = self.fileLabel.stringValue
    chartView.needsDisplay = true
    chartView.rightAxis.enabled = false
    chartView.legend.enabled = true
}

[liuxuan30]

refer ChartsDemo, the combined chart legends seems fine.