LineChart (gradient fill) is not working in Swift 4

[manishjaingit]

What did you do?

I have tried with change version in diploment target 11.2

What happened instead?

Actually, the given code seems in Swift 2.2 and i am looking for the version of swift 4 for the particular graph LineChart (gradient fill), can I have any solution or updated code for this?

Charts Environment

**Charts version/Branch/Commit Number: LineChart (gradient fill) **
Xcode: 9.4
Swift: 4
Platform(s) running Charts:
macOS version running Xcode: 11.2

[thierryH91200]

an example

           set1 = LineChartDataSet(values: yVals1, label: "DataSet 1")
            set1.axisDependency = .left
            set1.colors = [NSColor(red: CGFloat(255 / 255.0), green: CGFloat(241 / 255.0), blue: CGFloat(46 / 255.0), alpha: 1.0)]
            set1.drawCirclesEnabled = false
            set1.lineWidth = 2.0
            set1.circleRadius = 3.0
            set1.fillAlpha = 1.0
            set1.drawFilledEnabled = true
            set1.fillColor = NSColor.white
            set1.highlightColor = NSColor(red: CGFloat(244 / 255.0), green: CGFloat(117 / 255.0), blue: CGFloat(117 / 255.0), alpha: 1.0)
            set1.drawCircleHoleEnabled = false
            set1.fillFormatter = DefaultFillFormatter { _,_  -> CGFloat in
                return CGFloat(self.chartView.leftAxis.axisMinimum)
            }