How can i round the Bar chart graph in Ios Charts

I am trying to achieve the rounded bar chart graph.

this is my code I have tried to achieve this functionality. but it is not working I have tried some links but that does not work. Daniel Chart link

    chartView.legend.enabled = true
    chartView.chartDescription?.enabled = false
    chartView.maxVisibleCount = 100
    chartView.drawBarShadowEnabled = false
    chartView.drawValueAboveBarEnabled = false
    chartView.highlightFullBarEnabled = false
    chartView.leftAxis.drawGridLinesEnabled = false
    chartView.rightAxis.drawGridLinesEnabled = false
    chartView.xAxis.drawGridLinesEnabled = false
    chartView.drawGridBackgroundEnabled = false
    chartView.leftAxis.enabled = false
    chartView.leftAxis.drawAxisLineEnabled = false
    chartView.rightAxis.enabled = false
    chartView.rightAxis.drawAxisLineEnabled = false
    chartView.xAxis.enabled = false
    chartView.scaleXEnabled = true


    chartView.delegate = self
    chartView.dragEnabled = true
    chartView.doubleTapToZoomEnabled = false
    chartView.pinchZoomEnabled = false
    chartView.noDataTextColor  = .black

    let xAxis = chartView.xAxis
    xAxis.labelPosition = .top
    chartView.scaleXEnabled = true
    let l = chartView.legend
    l.horizontalAlignment = .center
    l.verticalAlignment = .bottom
    l.orientation = .horizontal
    l.drawInside = false
    l.xEntrySpace = 5
    l.yEntrySpace = 2
    l.yOffset = 5
    l.xOffset = 20