如何在ios-charts

时间:2016-10-10 14:11:40

标签: ios swift ios-charts

我在故事板中添加了bar chart,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)

setChart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
    }
}

但是效果并不好,如下所示:

enter image description here

如此处所示,它添加了6个标签而不是4个标签,并且它还有重复项。

我已经阅读了this solution,但正如您所看到的,它还存在一些问题。

我该如何解决这个问题?

1 个答案:

答案 0 :(得分:10)

我认为您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

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