how to scroll fixed amount of bar when scrolling the bar chart? (CHARTS SWIFT)

[Rumy-hasan]

When I first presenting my chart I Write this.

            chartView.data = data
            chartView.setVisibleXRangeMaximum(4)
            chartView.moveViewToX(Double(step.count - 5))

So It present me perfectly with the last 4 bars.But when I start to scrolling left to right It does not show me the previous 4 bar. Instead of it present me with some remaining bar and some previous bar.So How can I present it with next 4 bar or previous 4 bar according to our scroll.

[bohdansasko]

Thanks!