使用Swift图表绘制CombinedChartView

Question

我正在使用https://github.com/danielgindi/Charts并能够成功地呈现LineChartView。但是，尝试将一个非常简单的CombinedChartView呈现为一个空白图表。此外，任何触摸事件都会输出"CGAffineTransformInvert:奇异矩阵“。

@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()

我真的漏掉了什么吗？谢谢。

Answer 1

我完全忘记了随图表一起出现的演示。基本上，我们需要为每种类型的图设置数据集，然后将数据集分配给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()