How to use String values for X-Axis in Charts instead of doubles?

Question

I want to display String values for X-Axis in line chart via using 'Charts' I've followed tutorial for same here. As per wrote there
let lineChartData = LineChartData(xVals: dataPoints, dataSet: lineChartDataSet)
I'm not finding in current latest version of library. In, current library version's demo code I'm only able to fill double type of data for X-axis and Y-axis. Please help me to solve this.
Here is desired output.

Check this one https://stackoverflow.com/a/51612972/10150796 — Nikunj Kumbhani, Mar 18 '19 at 06:48
That is available for barChart, but I want to draw line chart. So constructor is different. — Mrugesh Tank, Mar 18 '19 at 06:50
It's not good to use String as X & Y values. You have to convert the string to double and use it. — Satyam, Mar 18 '19 at 06:55
@Satyam, I want to display "Jan", "Feb", "Mar" on X-axis as displayed in image. — Mrugesh Tank, Mar 18 '19 at 06:58
@MrugeshTank You can do the same thing for any type of chart. — Nikunj Kumbhani, Mar 18 '19 at 06:59
I used it long time back. There's a protocol IAxisValueFormatter that you can implement and achieve your result. — Satyam, Mar 18 '19 at 07:00
@Satyam, You saved my day. You can post this and some example as answer, I'll accept — Mrugesh Tank, Mar 18 '19 at 07:16

score 4 · Accepted Answer · edited Mar 18 '19 at 13:51

There's a protocol IAxisValueFormatter that you can implement and achieve your expected result.

EDIT:
How to use it

While initialising
chartView.xAxis.valueFormatter = self

and implementing protocol.

extension LineChart1ViewController: IAxisValueFormatter {
    func stringForValue(_ value: Double, axis: AxisBase?) -> String {
        let months = ["January","February","March","April","May","June","July","Auguest","September","October","November","December"]
        return months[Int(value)]
    }
}

How to use String values for X-Axis in Charts instead of doubles?

1 Answers1