值未显示在快速图表的条形顶部

Question

我正在使用SwiftChart库，但无法在图表视图中显示条形图的值。

有人可以帮助我吗？

// MARK: Variables
    var barChart: BarsChart?

  func updateCell(with arrDataSourceEnergyGraph: [EnergyGraph]) {

    if arrDataSourceEnergyGraph.count > 0 {
        if barChart != nil {
            barChart!.view.removeFromSuperview()
        }

        let arrKilowatt = (arrDataSourceEnergyGraph.map {$0.kilowatt.doubleValue})

        var chartSetting = ChartSettings()
        chartSetting.top = 5
        var from: Double = 0
        var to: Double = 1
        var by: Double = 0.5

        if arrKilowatt.min() != arrKilowatt.max() {
            from = arrKilowatt.min()!.rounded()
            if arrKilowatt.max()!.rounded() == 0.0 {
                if arrKilowatt.max()! < 0.5 {
                    to = arrKilowatt.max()! + arrKilowatt.max()!
                    by = ((from + to) / 6)
                }else {
                    to = arrKilowatt.max()! + arrKilowatt.max()!
                    by = ((from + to) / 4)
                }

            }else {
                to = arrKilowatt.max()!.rounded() + 2
                 by = ((from + to) / 4).rounded()
            }

        }

        let chartAxisConfig = ChartAxisConfig(from: from, to: to, by: by)

        let guidelinesConfig = GuidelinesConfig(dotted: false, lineWidth: 0.1, lineColor: UIColor.white)
        let xAxisLabelSettings: ChartLabelSettings = ChartLabelSettings(font: UIFont(name: Constant.Font.Regular, size: 10.proportionalFontSize)!, fontColor: UIColor.black)
        let yAxisLabelSettings: ChartLabelSettings = ChartLabelSettings()

        let chartConfig = BarsChartConfig(chartSettings: chartSetting,
                                          valsAxisConfig: chartAxisConfig,
                                          xAxisLabelSettings: xAxisLabelSettings,
                                          yAxisLabelSettings: yAxisLabelSettings,
                                          guidelinesConfig: guidelinesConfig
        )

        var graphList: [(String, Double)] = []

        for model in arrDataSourceEnergyGraph {
            graphList.append((model.dayMonth, model.kilowatt.doubleValue))
            print("chartValue", model.kilowatt.doubleValue)
        }

        let frame = CGRect(x: -15, y: 0, width: self.width + 5, height: self.height - 15)

        barChart = BarsChart(
            frame: frame,
            chartConfig: chartConfig, xTitle: "", yTitle: "", bars: graphList,
            color: UIColor.mOrangeColor(), barWidth: GET_PROPORTIONAL_WIDTH(20),
            animDuration: 0.5
        )
        self.chartView.addSubview(barChart!.view)
        guard let firstDate = arrDataSourceEnergyGraph.first?.dayAndMonth, let lastDate = arrDataSourceEnergyGraph.last?.dayAndMonth else { return }

        self.labelDuration.text = "Energy Used (\(firstDate) to \(lastDate))"
    }
}

我的代码正确显示了图形，但条形图的顶部没有显示值。

Screenshot here