[LineChartView] Issues with circles positions

[nastasiupta]

[*] I've read, understood, and done my best to follow the *CONTRIBUTING guidelines.

What did you do?

lineChartView?.xAxis.labelPosition = .bottom
lineChartView?.xAxis.valueFormatter = self
lineChartView?.xAxis.labelTextColor = Color.main.color
lineChartView?.xAxis.labelFont = AppFonts.regular.font.withSize(7)
lineChartView?.xAxis.gridColor = UIColor(red: 224.0/255.0, green: 231.0/255.0, blue: 255.0/255.0, alpha: 1.0)
lineChartView?.leftAxis.labelTextColor = Color.main.color
lineChartView?.leftAxis.labelFont = AppFonts.regular.font.withSize(9)
lineChartView?.leftAxis.gridColor = UIColor(red: 224.0/255.0, green: 231.0/255.0, blue: 255.0/255.0, alpha: 1.0)
lineChartView?.leftAxis.axisMinimum = 0
lineChartView?.rightAxis.enabled = false
lineChartView?.legend.enabled = false
lineChartView?.isUserInteractionEnabled = false
var dataEntries: [ChartDataEntry] = []
for i in 0 ..< viewModel.values.count {
let dataEntry = ChartDataEntry(x: Double(i), y: Double(viewModel.values[i]))
dataEntries.append(dataEntry)
}
let lineDataSet = LineChartDataSet(entries: dataEntries)
lineDataSet.colors = [viewModel.graphColor]
lineDataSet.lineWidth = 2.0
lineDataSet.circleRadius = 4.0
lineDataSet.circleColors = [viewModel.graphColor]
let chartData = LineChartData(dataSet: lineDataSet)
lineChartView?.data = chartData

What did you expect to happen?

See each bubble, aligned with the X-axis line, not delayed as we have here:
Only the first one is having the position correct:

What happened instead?

The 2nd, 3rd and 4th position is wrong

Also,
func stringForValue(_ value: Double, axis: AxisBase?) -> String

value: Double is having the value 0.3, 0.6, 1.3 :| instead of 0, 1, 2, 3 etc

Charts Environment

Charts version/Branch/Commit Number: 3.4.0
Xcode version: 11.1 (11A1027)
Swift version: 5.0
Platform(s) running Charts: iPhone X iOS 13.1
macOS version running Xcode: macOS Catalina 10.15

[liuxuan30]

I suggest you take a look at ChartsDemo. This looks like your data issue, as the x axis label value and circle x value is not the same.