How do I draw yaxis min value as different color on certain limit? - ios

Question

I am using iOS Charts to draw linechart but unable to draw the same graph as shown below in the image. I tried by setting leftAxis.axisMinimum = minValue but it also not working. If the given value is minimum on certain limit it should show in red color as shown in attached image.
func setLineChartWithDateFormat(graphPoints: [GraphPoints], linePosition: CGFloat, minValue: Double = 0, fillColor: UIColor = UIColor(red: 158.0/255.0, green: 188.0/255.0, blue: 136.0/255.0, alpha: 1)) {
var referenceTimeInterval: TimeInterval = 0
if let minTimeInterval = (graphPoints.map { ($0.getDateFromDateTime?.timeIntervalSince1970 ?? 0) }).min() {
referenceTimeInterval = minTimeInterval
}
let formatter = DateFormatter()
formatter.locale = Locale(identifier: "en_US_POSIX")
formatter.dateFormat = "MMM dd"
let xValuesNumberFormatter = ChartXAxisWithFormatter(referenceTimeInterval: referenceTimeInterval, dateFormatter: formatter)
// Define chart entries
var entries = [ChartDataEntry]()
var xAxisValues = [CGFloat]()
for object in graphPoints {
let timeInterval = object.getDateFromDateTime?.timeIntervalSince1970 ?? 0
let xValue = (timeInterval - referenceTimeInterval) / (3600 * 24)
xAxisValues.append(CGFloat(xValue))
let yValue = object.price ?? 0
let entry = ChartDataEntry(x: xValue, y: yValue)
entry.setValue(object.getDateFromDateTime, forKey: "data")
entries.append(entry)
}
var minValue = xAxisValues.min()
let chartDataSet = LineChartDataSet(entries: entries, label: "BPM")
chartDataSet.fillColor = fillColor
/// Data object that encapsulates all data associated with a LineChart.
let chartData = LineChartData()
chartData.addDataSet(chartDataSet)
chartData.setDrawValues(false)
chartDataSet.drawCirclesEnabled = false
chartDataSet.mode = .linear
chartDataSet.colors = [.white]
chartDataSet.fillFormatter = LineChartFillFormatter(value: minValue ?? 0)
// let gradientColors = [gradientColor1.cgColor, gradientColor2.cgColor] as CFArray
// let colorLocations: [CGFloat] = [0.7,0.0]
// guard CGGradient.init(colorsSpace: CGColorSpaceCreateDeviceRGB(), colors: gradientColors, locations: colorLocations) != nil else {
// print("Gradient Error")
// return
// }
chartDataSet.drawFilledEnabled = true
chartDataSet.fillAlpha = 1
chartDataSet.setDrawHighlightIndicators(true)
chartDataSet.drawHorizontalHighlightIndicatorEnabled = false
// lineChart.leftAxis.axisMinimum = minValue
///x axis for chart view
let xAxis: XAxis = self.lineChart.xAxis
xAxis.labelPosition = .bottomInside
xAxis.drawGridLinesEnabled = true //true, if want x Axis grid lines
xAxis.valueFormatter = xValuesNumberFormatter
xAxis.gridColor = gridColor
xAxis.axisLineColor = gridColor
xAxis.labelFont = BSFonts.getFontWithSize(fontType: .iBMPlexSansCond, fontSize: BSFontSize.small)
xAxis.labelTextColor = axisTextColor
xAxis.labelPosition = .bottom
xAxis.spaceMin = 0.5
xAxis.drawAxisLineEnabled = false
xAxis.drawLimitLinesBehindDataEnabled = true
xAxis.granularityEnabled = true
// xAxis.granularity = 2
xAxis.labelWidth = UIDevice.current.isIPad ? 30 : 20
// xAxis.labelCount = 4
///right axis for chart view
let rightAxis: YAxis = lineChart.rightAxis
rightAxis.enabled = false
///y axis of chart view
let leftAxis: YAxis = lineChart.leftAxis
leftAxis.labelPosition = .insideChart
leftAxis.drawGridLinesEnabled = true //true, if want y axis grid lines
leftAxis.drawLabelsEnabled = true
leftAxis.gridColor = gridColor
leftAxis.axisLineColor = gridColor
leftAxis.labelFont = BSFonts.getFontWithSize(fontType: .iBMPlexSansCond, fontSize: BSFontSize.small)
leftAxis.labelTextColor = axisTextColor
leftAxis.labelPosition = .outsideChart
//leftAxis.spaceBottom = 0.3
leftAxis.drawAxisLineEnabled = false
leftAxis.labelCount = 4
/// The data for the chart
lineChart.data = chartData
lineChart.doubleTapToZoomEnabled = false
lineChart.data?.highlightEnabled = true
}