Charts 3.0 labelCount bug?

[Asavarkhul]

When we want to display only 1 xAxis label, the labelCount force to show multiple label but we want to display only one line..

For example :

if labelCount = 2 (default minimum value)

But if we force this to 3 for example

Is this behavior a bug? or do we have miss something?

Here is our code :

var yVals = [BarChartDataEntry]()
var xVals = [String]()
            
if chartDataCompanies.count > 0 {
   let maxDataEntry: Int = 15
                
   //sort
   var chartDataCompanies = chartDataCompanies.values.filter({$0.solvedRate > 0.0 && $0.issuesCount > 0}).sorted(by: {$0.solvedRate > $1.solvedRate})
                
   //subArray
   let index = min(maxDataEntry, chartDataCompanies.count)
   let companies = chartDataCompanies[0..<index]
                
   for (index, data) in companies.enumerated() {
      yVals.append(BarChartDataEntry(x: Double(index), y: data.solvedRate))
      xVals.append(data.descriptionString)
   }
                
   let barDataSet = BarChartDataSet(values: yVals, label: nil)
   barDataSet.drawValuesEnabled = false
   barDataSet.colors =  PreferredChartsColors
                
   let chartData = BarChartData(dataSets: [barDataSet])
   chartData.setValueFont(UIFont.preferredFont(forTextStyle: UIFontTextStyle.subheadline))
   reloadChartViewWithData(chartData)
                
   self.chartView.xAxis.labelCount = xVals.count
   self.chartView.xAxis.valueFormatter = DefaultAxisValueFormatter { (value, axis) -> String in
      return xVals[Int(value)]
   }
} else {
   let barDataSet = BarChartDataSet(values: yVals, label: nil)
   let chartData = BarChartData(dataSets: [barDataSet])
   reloadChartViewWithData(chartData)
}

[liuxuan30]

looks like you don't turn on axis.forceLabelsEnabled.
BTW, look at computeAxisValues(min yMin: Double, max yMax: Double) and you will know how it works.

[Asavarkhul]

@liuxuan30 Hello, can you try with this example project https://github.com/Asavarkhul/ChartsSampleProject this simply show how we implement it and show directly the bug

[liuxuan30]

I can' debug your code because you don't have Charts source code. But I do tried it in ChartsDemo - horizontal bar chart, it works I think. Would you try it first?

Some thing you could try:
double barWidth = 9.0;
double spaceForBar = 10.0;

Also, I am wrong about labelCount when you set it to 1: it's range is 2 - 25.

And:
Be careful calling below two func, one enables forceLabelsEnabled and the one ther one not:

    open var labelCount: Int
    {
        get
        {
            return _labelCount
        }
        set
        {
            _labelCount = newValue

            if _labelCount > 25
            {
                _labelCount = 25
            }
            if _labelCount < 2
            {
                _labelCount = 2
            }

            forceLabelsEnabled = false
        }
    }

    open func setLabelCount(_ count: Int, force: Bool)
    {
        self.labelCount = count
        forceLabelsEnabled = force
    }

One thing to mention:
Set chartView.data = data at last after you configure your chart, or call notifyDataSetChanged manually. You put it in a thread, which may cause side effect.

[liuxuan30]

OK I found what's your problem:
you don't set granularity and you only have 1 x which is 0 - an embrassing number, so it calculates the x range is [-0.4, -0.2, 0, 0.2, 0.4], so it has several labels, but you format them as one label. That's what granularity is supposed to solve.

You should set granularity like to 1, then you only get 1 label
Don't forget to change barWidth, so you bar don't seem too wide.