如何在 iOS 条形图上将这些双精度数转换为整数？

Question

我想将下图中的这些双精度数转换为整数：

我听从了其他帖子的建议并创建了一个实现 IAxisValueFormatter 的 YAxisValueFormatter() 但这不会影响条形图上的值，只会影响轴。

这是我的图表代码：

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

    let formato:BarChartFormatter = BarChartFormatter()
    formato.setValues(values: dataPoints)
    let xaxis:XAxis = XAxis()

    let xAxis : XAxis = self.barChartView.xAxis;
    barChartView.noDataText = "you need to provide some data for the chart."

    var dataEntries: [BarChartDataEntry] = Array()


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

    xaxis.valueFormatter = formato

    barChartView.xAxis.valueFormatter = xaxis.valueFormatter

     xAxis.labelFont = UIFont(name: "Avenir", size: 14.0)!
     xAxis.labelTextColor = UIColor.white


    let chartDataSet = BarChartDataSet(values: dataEntries, label: "Games Played")
    let chartData = BarChartData(dataSets: [chartDataSet])
    chartDataSet.colors = ChartColorTemplates.material()

    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

    barChartView.leftAxis.enabled = true
    barChartView.legend.enabled = false
    barChartView.chartDescription?.text = ""

    chartData.addDataSet(chartDataSet)
    barChartView.data = chartData

    chartData.setDrawValues(true)
    chartDataSet.drawValuesEnabled = true
    barChartView.barData?.setValueFont(UIFont(name: "Avenir", size: 12.0))
    barChartView.barData?.setValueTextColor(UIColor.white)

    barChartView.xAxis.granularity = 1.0

    barChartView.leftAxis.drawGridLinesEnabled = false
    barChartView.rightAxis.drawGridLinesEnabled = false
    barChartView.xAxis.drawGridLinesEnabled = false
    barChartView.leftAxis.labelFont = UIFont(name: "Avenir", size: 12.0)!
    barChartView.leftAxis.labelTextColor = UIColor.white
    barChartView.leftAxis.axisMinimum = 0
    barChartView.leftAxis.valueFormatter = YAxisValueFormatter()

    self.barChartView.xAxis.labelPosition = XAxis.LabelPosition.bottom

}

这是我的 YAxisValueFormatter class:

class YAxisValueFormatter: NSObject, IAxisValueFormatter {

let numFormatter: NumberFormatter

override init() {
    numFormatter = NumberFormatter()
    numFormatter.minimumFractionDigits = 0
    numFormatter.maximumFractionDigits = 0

    // if number is less than 1 add 0 before decimal
    numFormatter.minimumIntegerDigits = 0 // how many digits do want before decimal
    numFormatter.paddingPosition = .beforePrefix
    numFormatter.paddingCharacter = "0"
}

/// Called when a value from an axis is formatted before being drawn.
///
/// For performance reasons, avoid excessive calculations and memory allocations inside this method.
///
/// - returns: The customized label that is drawn on the axis.
/// - parameter value:           the value that is currently being drawn
/// - parameter axis:            the axis that the value belongs to
///

public func stringForValue(_ value: Double, axis: AxisBase?) -> String     {
    return numFormatter.string(from: NSNumber(floatLiteral: value))!
}
}

Answer 1

给 chartDataSet 自己的 valueFormatter:

展示了如何创建您需要的 valueFormatter。然后将charDataSet的valueFormatter设置为：

chartDataSet.valueFormatter = DigitValueFormatter()

如何在 iOS 条形图上将这些双精度数转换为整数？

How can I convert these doubles to integers on this iOS Bar Chart?

charts

ios

swift

ios-charts