ios - 错误 - 无法使用类型为 'LineChartData' 的参数列表调用类型为 '(xVals: [String], dataSet: LineChartDataSet)' 的初始值设定项

Question

我目前正在使用 Charts在我的应用程序中使用折线图的框架。我使用了下面的代码，但发生了错误。这是代码-

`func setChart(dataPoints: [String], values: [Double]) {

    var dataEntries: [ChartDataEntry] = []

    for i in 0..<dataPoints.count {
        let dataEntry = ChartDataEntry(x: values[i], y: Double(i))
        dataEntries.append(dataEntry)


    var colors: [UIColor] = []

    for i in 0..<dataPoints.count {
        let red = Double(arc4random_uniform(256))
        let green = Double(arc4random_uniform(256))
        let blue = Double(arc4random_uniform(256))

        let color = UIColor(red: CGFloat(red/255), green: CGFloat(green/255), blue: CGFloat(blue/255), alpha: 1)
        colors.append(color)
    }



        let lineChartDataSet = LineChartDataSet(values: dataEntries, label: "Units Sold")

        let lineChartDataa = LineChartData(xVals: dataPoints, dataSet: lineChartDataSet)

    Graph.data = lineChartDataa

}
`

发生的错误如下-

Cannot invoke initializer for type 'LineChartData' with an argument list of type '(xVals: [String], dataSet: LineChartDataSet)'

关于如何解决这个问题的任何想法。

Answer 1

你必须这样使用:

这是设置LineChartData:

let lineChartDataSet = LineChartDataSet(values: dataEntries, label: "Units Sold")     
let lineChartDataa = LineChartData(dataSet: lineChartDataSet)

用于设置 xAxis 标签:

Graph.xAxis.labelPosition = XAxis.LabelPosition.bottom
Graph.xAxis.valueFormatter = IndexAxisValueFormatter(values: dataPoints)