Rendering CombinedChartView using Swift Charts

Question

I am using https://github.com/danielgindi/Charts and able to successfully render LineChartView. However, trying to render a very simple CombinedChartView renders as a blank chart. Also, any touch event will output "CGAffineTransformInvert: singular matrix."

@IBOutlet weak var chartView: CombinedChartView!

var lineData = [ChartDataEntry]()
lineData.append(ChartDataEntry(x: Double(0), y: drand48()))
let lineDataSet = LineChartDataSet(values: lineData, label: "line")

var barData = [BarChartDataEntry]()
barData.append(BarChartDataEntry(x: Double(0), y: drand48()))
let barDataSet = BarChartDataSet(values: barData, label: "bar")

let combinedData = CombinedChartData(dataSets: [lineDataSet, barDataSet])
chartView.data = combinedData
charView.notifyDataSetChanged()

Am I totally missing something here? Thank you.

Answer 1

I totally forgot about the demo that comes along with Charts. Basically, we need to set the data sets for each type of graph; then assign the data sets to the CombinedChartData.

@IBOutlet weak var chartView: CombinedChartView!

var lineData = [ChartDataEntry]()
lineData.append(ChartDataEntry(x: Double(0), y: drand48()))
let lineDataSet = LineChartDataSet(values: lineData, label: "line")
let lineChartData = LineChartData(dataSets: [lineDataSet])

var barData = [BarChartDataEntry]()
barData.append(BarChartDataEntry(x: Double(0), y: drand48()))
let barDataSet = BarChartDataSet(values: barData, label: "bar")
let barChartData = BarChartData(dataSets: [barDataSet])

let combinedData = CombinedChartData()
combinedData.lineData = lineChartData
combinedData.barData = barChartData
chartView.data = combinedData
charView.notifyDataSetChanged()