如何在 ios-charts 中为 BarChartView 添加 XAxis 标签

我添加了一个条形图 https://github.com/danielgindi/ios-charts到故事板，但我无法正确设置数据条目的标签。

这是我的代码：

var names = ["aaa", "bbb", "ccc", "ddd"]
var values = [230.0, 280.0, 450.0, 340.0]

setChart(dataPoints: names, values: values)

设置图表函数：

func setChart(dataPoints: [String], values: [Double])
{
    let formatter = BarChartFormatter()
    formatter.setValues(values: dataPoints)
    let xaxis:XAxis = XAxis()


    barChartView.noDataText = "You need to provide data for the chart."
    var dataEntries: [BarChartDataEntry] = []

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

    let chartDataSet = BarChartDataSet(values: dataEntries, label: "موجودی")

    let chartData = BarChartData(dataSet: chartDataSet)


    xaxis.valueFormatter = formatter
    barChartView.xAxis.labelPosition = .bottom
    barChartView.xAxis.drawGridLinesEnabled = false
    barChartView.xAxis.valueFormatter = xaxis.valueFormatter
    barChartView.chartDescription?.enabled = false
    barChartView.legend.enabled = true
    barChartView.rightAxis.enabled = false
    barChartView.data = chartData
}

最后是格式化程序：

@objc(BarChartFormatter)
public class BarChartFormatter: NSObject, IAxisValueFormatter
{
    var names = [String]()

    public func stringForValue(_ value: Double, axis: AxisBase?) -> String
    {
        return names[Int(value)]
    }

    public func setValues(values: [String])
    {
        self.names = values
    }
}

但效果并不好，如下所示：

如图所示，它添加了 6 个标签而不是 4 个标签，并且它也有重复项。

我已经读过这个解决方案 https://stackoverflow.com/questions/39049188/how-to-add-strings-on-x-axis-in-ios-charts/39149070#39149070但是，正如您所看到的，它还存在一些问题。

我怎么解决这个问题？

我认为你可以尝试设置以下属性：

barChartView.xAxis.granularityEnabled = true
barChartView.xAxis.granularity = 1.0 //default granularity is 1.0, but it is better to be explicit
barChartView.xAxis.decimals = 0

源代码告诉您很多有关上述属性的信息。https://github.com/danielgindi/Charts/blob/master/Source/Charts/Components/AxisBase.swift https://github.com/danielgindi/Charts/blob/master/Source/Charts/Components/AxisBase.swift