HorizontalBarChartView text for xValues -- charts 3.0

[0xCaponte]

I am working with an horizontal bar chart, with version 2.2.5 my original code was:

    var dataEntries: [BarChartDataEntry] = []

    for i in 0..<dataPoints.count {
        let dataEntry = BarChartDataEntry(value: values[i], xIndex: i)
        dataEntries.append(dataEntry)
    }

    let chartDataSet = BarChartDataSet(yVals: dataEntries, label: "Affected")

   var formatedResults = [String]()

    for i in 0..<dataPoints.count {

        let label = dataPoints[i].company! as String
        formatedResults.append(label)
    }

    //Coloring the bars and creating the labels
    var colors = [UIColor]()

    for i in 0..<dataPoints.count {

        if (i % 2 == 0){
            colors.append(Colors.blue)
        }else{
            colors.append(Colors.gray)
        }
    }

    chartDataSet.colors = colors

    // Adds the data to the chart
    let chartData = BarChartData(xVals: formatedResults, dataSet: chartDataSet)
    barChartView.data = chartData

But with the version 3.0 I can not create my BarChartData that way, so I do not know how to set the names I want as the xValues.

I am getting just 0/2/4... as the text, always even numbers every other bar and I have no idea how to get it fixed.

My current code:
var dataEntries: [BarChartDataEntry] = []

    for i in 0..<dataPoints.count {

        let dataEntry = BarChartDataEntry(x : Double(i), y : values[i])
        dataEntries.append(dataEntry)
    }

    let chartDataSet = BarChartDataSet(values: dataEntries, label: "Affected")

    var formatedResults = [String]()

    for i in 0..<dataPoints.count {

        let label =  dataPoints[i].company! as String
        formatedResults.append(label)
    }

    //Coloring the bars and creating the labels
    var colors = [UIColor]()

    for i in 0..<dataPoints.count {

        if (i % 2 == 0){
            colors.append(Colors.blue)
        }else{
            colors.append(Colors.gray)
        }
    }

    chartDataSet.colors = colors
    chartDataSet.drawValuesEnabled = false // Hides the values on the bars

    // Adds the data to the chart
    let chartData = BarChartData(dataSet: chartDataSet)
    chartData.barWidth = 0.5

    barChartView.data = chartData

Current Result:

[liuxuan30]

In chart 3.0, x axis does not work any more as it used to be. The x axis is redesigned and works more like y axis.

I tried with ChartsDemo horizontal bar chart with an trick _chartView.xAxis.labelCount = count; in - (void)setDataCount:(int)count range:(double)range and it shows every label then.

What I know for the moment is, you can try change labelCount, because by default how many x axis labels are displayed is calculated by computeAxisValues(). You can also take a look at it and override it with your desired behaviors, like display every label.

But do be aware that xAxis.labelCount = count is not equivalent to open func setLabelCount(_ count: Int, force: Bool), because forceLabelsEnabled is false in labelCount setter:

    /// the number of label entries the y-axis should have
    /// max = 25,
    /// min = 2,
    /// default = 6,
    /// be aware that this number is not fixed and can only be approximated
    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
    }

Short answer is when enable forceLabelsEnabled, it will not apply a small algorithm to calculate nice numbers but just do a brute calcualation like interval = Double(range) / Double(labelCount - 1) For the details please check computeAxisValues().

@danielgindi Is there any other convenient way to configure this? I don't see there is property that controls inertval but only granularity or labelCount

[0xCaponte]

I am lookind at what you mentiones @liuxuan30 , but I wanted to point the issue in another directions. My original chart looked like this:

Is it possible to get that look, those company text labels on the new version?

[kientux]

@caat91 To show those company text labels, you must use function stringForXValue of protocol ChartXAxisValueFormatter. But the problem here is that you will get Company 2, Company 4, Company 6... only because of auto-calculating axis labels feature. I will try what @liuxuan30 suggested and feedback later.

[0xCaponte]

@kientux your suggestion did the trick for me regarding the text labels, I just extended de IAxisValueFormatter protocol and added the stringForXValue methods.

I was able to follow @liuxuan30 idea and got the following result but is there a way to align the labels with the bars?

Also, Is this an issue than you are planning to address or is this just the new behaviour of the barchart and there are no plans of modifying it?

[liuxuan30]

well you have to debug a little, I don't see this in ChartsDemo. Need more info why not centered..
Just use shorter text and maybe check ChartsDemo.
Bottom line: Chart 3.0 x axis code differs from 2.x, you should not reuse your data portion of code but write new code to setup your chart data.

[Paradolle]

I meet the same issue using Charts 3.0 (in VerticalBarChartView as well), could you teach me how to write the extension in IAxisValueFormatter and added the 'stringForXValue' please? Thanks a lot

[danielgindi]

Please see the demos. Another way is to just init a DefaultAxisValueFormatter with a block.