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I'm using charts library for creating graph like this

I'm using this code to populate the chart.
The data that is sent in the below code is

[[1.6667000000000001, 2.0], [1.6667000000000001, 1.0], [1.6667000000000001, 1.0], [2.3333000000000004, 2.0], [1.3332999999999999, 1.0], [1.6667000000000001, 3.0], [1.3332999999999999, 2.0], [1.3332999999999999, 1.0], [2.3333000000000004, 3.0], [2.0, 2.0], [2.6666999999999996, 3.0], [2.3333000000000004, 1.0], [2.3333000000000004, 2.0]]

func setChart(data:[[Double]]) 
 barChartView.noDataText = "You need to provide data for the chart."
 var dataEntries: [[BarChartDataEntry]] = []

 for _ in 0..<data.first!.count
 dataEntries.append([])
 

 for i in 0..<data.count 

 for g in 0..<dataEntries.count
 dataEntries[g].append(BarChartDataEntry(x: Double(i), y: data[i][g]))
 

 

 var dataSet = [BarChartDataSet]()

 for i in 0..<dataEntries.count 

 let some = BarChartDataSet(values: dataEntries[i], label: nil)
 some.colors = ChartColorTemplates.colorful()
 dataSet.append(some)

 



 let chartData = BarChartData(dataSets: dataSet)


 let groupSpace = 0.025
 let barSpace = 0.4
 let barWidth = 0.8
 // (0.05 + 0.03) * 3 + 0.3 = 1.00 -> interval per "group"
 //(groupSpace * barSpace) * n + groupSpace = 1
 //()*13
 let startYear = 0


 chartData.barWidth = barWidth;
 barChartView.xAxis.axisMinimum = Double(startYear)
 let gg = chartData.groupWidth(groupSpace: groupSpace, barSpace: barSpace)
 print("Groupspace: (gg)")
// barChartView.xAxis.axisMaximum = Double(startYear) + gg * Double(groupCount)
 barChartView.xAxis.axisMaximum = 25
 barChartView.groupBars(fromX: Double(startYear), groupSpace: groupSpace, barSpace: barSpace)
 //chartData.groupWidth(groupSpace: groupSpace, barSpace: barSpace)
 barChartView.notifyDataSetChanged()

 barChartView.data = chartData






 //background color
 barChartView.backgroundColor = UIColor(red: 189/255, green: 195/255, blue: 199/255, alpha: 1)

 //chart animation
 barChartView.animate(xAxisDuration: 1.5, yAxisDuration: 1.5, easingOption: .linear)

This is not working correctly I'm having overlapped bars. the X-Axis maximum is not creating automatically. I don't know what I am doing wrong here. Anyone can please tell me where I'm wrong.
The number of bars per group is 13 and the number of groups can vary till 50.

Its very simple and you are setting groupBars for barChartView. Its wrong.

barChartView.groupBars(fromX: Double(startYear), groupSpace: groupSpace, barSpace: barSpace)

You have to set groupBars for chartData. Like below

chartData.groupBars(fromX: Double(startYear), groupSpace: groupSpace, barSpace: barSpace)