Line chart fill color is faded - swift

Question

I am trying to setup a line chart with one fill colour but for some reason, the fill colour is faded.
Example
Both the random view I have added to middle of screen and the fill colour of the line chart are set to be red, but for some reason the fill colour of the chart is faded.
Can see code here
#IBOutlet var liveChart : LineChartView!
override func viewDidLoad() {
super.viewDidLoad()
self.title = "Chart Tests"
configureChart(chart: liveChart)
var xAxis = [String]()
var yAxis = [Double]()
for _ in 0..<10
{
xAxis.append("")
let yVal = Double(randomBetweenNumbers(firstNum: 1.0, secondNum: 100.0))
yAxis.append(yVal)
}
setData(xAxisArray: xAxis, yAxisArray: yAxis, chart: liveChart)
let testView = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
testView.center = view.center
testView.backgroundColor = UIColor.red
view.addSubview(testView)
}
func randomBetweenNumbers(firstNum: CGFloat, secondNum: CGFloat) -> CGFloat{
return CGFloat(arc4random()) / CGFloat(UINT32_MAX) * abs(firstNum - secondNum) + min(firstNum, secondNum)
}
func configureChart(chart : LineChartView)
{
chart.chartDescription?.text = ""
chart.noDataText = "Loading Data"
chart.backgroundColor = UIColor.clear
chart.drawGridBackgroundEnabled = false
chart.dragEnabled = true
chart.rightAxis.enabled = false
chart.leftAxis.enabled = true
chart.doubleTapToZoomEnabled = false
chart.legend.enabled = false
chart.pinchZoomEnabled = true
chart.highlightPerTapEnabled = false
chart.highlightPerDragEnabled = false
chart.xAxis.enabled = false
chart.leftAxis.drawAxisLineEnabled = false
chart.leftAxis.drawGridLinesEnabled = false
chart.leftAxis.labelCount = 5
chart.leftAxis.forceLabelsEnabled = true
}
func setData(xAxisArray : [String], yAxisArray : [Double], chart : LineChartView)
{
var yVals1 : [ChartDataEntry] = [ChartDataEntry]()
if(xAxisArray.count > 0)
{
for i in 0 ..< xAxisArray.count
{
let chartEntry = ChartDataEntry(x: Double(i), y: yAxisArray[i], data: nil)
yVals1.append(chartEntry)
}
}
let set1: LineChartDataSet = LineChartDataSet(values: yVals1, label: "")
set1.fillColor = UIColor.red
set1.drawFilledEnabled = true
set1.drawCirclesEnabled = false
let data = LineChartData()
data.addDataSet(set1)
liveChart.data = data
}
Is there a way to fix this? Or is this just the way the fill colour of the chart works?
Edit:
I am using
https://github.com/danielgindi/Charts

Answer 1

I assume you use this library: https://github.com/kevinbrewster/SwiftCharts
So the LineChartView automatically set alpha for the fill color: https://github.com/kevinbrewster/SwiftCharts/blob/master/SwiftCharts/LineChart.swift#L758
try to set fillAlpha property of the data set