Charts: How to get back x-values for BarChart[Charts 3 migration problem]

Hello,

I’m trying to get started with Charts 3 but I’ve got some migration problems. That old Charts code created a Bar Chart with a history for right and wrong answered questions and writing the Day on the top over the belonging Bar.

I’ve built it with the following code:

            let examHistoryChartFrame = CGRectMake(scrWidth*0.08, 24 + scrWidth*1.68 , scrWidth*0.84, scrWidth*0.84)
            let examHistoryView = BarChartView(frame: examHistoryChartFrame)

            examHistoryView.descriptionText = ""
            examHistoryView.userInteractionEnabled = false
            //  historyBarChartView.xAxis.valueFormatter = NSNumberFormatter()
            examHistoryView.rightAxis.enabled = false
            let formatter = NSNumberFormatter()
            formatter.minimumFractionDigits = 0
            examHistoryView.leftAxis.valueFormatter = formatter
            examHistoryView.drawHighlightArrowEnabled = true
            examHistoryView.drawValueAboveBarEnabled = false
            examHistoryView.xAxis.drawGridLinesEnabled = false

           //...getting the data in some way....

           var counter = 0
           let fi = getDataEntries(dataPoints, values: firstValues, counter: counter)
           counter += 1
           let sec = getDataEntries(dataPoints, values: secondValues, counter: counter)
           dataPoints = transformDataPoints(dataPoints)
           examHistoryView.data =  BarChartData(xVals: dataPoints, dataSets: [fi,sec])

The getDataEntries(…) function does the following:

    func getDataEntries(dataPoints: [String], values: [Double], counter: Int) -> BarChartDataSet{
        var dataEntries: [ChartDataEntry] = []
        for i in 0..<dataPoints.count {
            let dataEntry = BarChartDataEntry(value: values[i], xIndex: i)
            dataEntries.append(dataEntry)
        }
        let ret = BarChartDataSet(yVals: dataEntries)
        ret.drawValuesEnabled = false
        switch counter{
            case 0:
                ret.colors = [GREEN]
                ret.label = "Richtig beantwortet"
                break
            case 1:
                ret.colors = [RED]
                ret.label = "Falsch beantwortet"
                break
            default:
                break
        }
        return ret
    }

After the update I’ve tried everything to bring the Dates back to the Chart but I can’t make it.

Does anybody know which attribute I should manipulate for achieving my goal?

Thanks for your help! Patrick