错误 - 无法使用类型为'（xVals：[String]，dataSet：LineChartDataSet）的参数列表调用类型'LineChartData'的初始化程序

I am currently using the Charts framework to use a line graph within my app. I have used the code below but an error is occurring. Here is the code-

我目前正在使用Charts框架在我的应用程序中使用折线图。我使用了下面的代码但是发生了错误。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

}
`

The error that is occurring is below-

发生的错误如下 -

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

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

Any ideas how I could fix this.

我有什么想法可以解决这个问题。

2 个解决方案

#1

LineChartData has declared this as init.

LineChartData已将此声明为init。

public override init(dataSets: [IChartDataSet]?)

Its superclass, ChartData has declared these inits:

它的超类ChartData声明了这些内容:

@objc public init(dataSets: [IChartDataSet]?)


@objc public convenience init(dataSet: IChartDataSet?)

It looks like the init with params that you are trying, is not available, hence the compiler error.

看起来你正在尝试使用params的init是不可用的,因此编译错误。

#2

You have to use like this :

你必须这样使用:

This is to set LineChartData:

这是设置LineChartData:

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

For setting xAxis labels :

要设置xAxis标签:

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

#1