图表显示不正确？ iOS 图表库答案

【问题标题】：Chart not showing properly? iOS Charts library图表显示不正确？ iOS 图表库
【发布时间】：2019-03-07 13:07:32
【问题描述】：

我正在使用charts 库来创建这样的图表

我正在使用此代码来填充图表。下面代码中发送的数据是

[[1.6667000000000001, 2.0], [1.6667000000000001, 1.0], [1.6667000000000001, 1.0], [2.3333000000000004, 2.0], [1.3332999999999999, 1.0], [1.6667000000000001, 3.0], [1.3332999999999999, 2.0], [1.3332999999999999, 1.0 ], [2.3333000000000004, 3.0], [2.0, 2.0], [2.6666999999999996, 3.0], [2.3333000000000004, 1.0], [2.3333000000000004, 2.0]]

func setChart(data:[[Double]]) {
    barChartView.noDataText = "You need to provide data for the chart."
    var dataEntries: [[BarChartDataEntry]] = []

    for _ in 0..<data.first!.count{
        dataEntries.append([])
    }

    for i in 0..<data.count {

        for g in 0..<dataEntries.count{
            dataEntries[g].append(BarChartDataEntry(x: Double(i), y: data[i][g]))
        }

    }

    var dataSet = [BarChartDataSet]()

    for i  in 0..<dataEntries.count {

        let some = BarChartDataSet(values: dataEntries[i], label: nil)
        some.colors = ChartColorTemplates.colorful()
        dataSet.append(some)

    }



    let chartData = BarChartData(dataSets: dataSet)


    let groupSpace = 0.025
    let barSpace = 0.4
    let barWidth = 0.8
    // (0.05 + 0.03) * 3 + 0.3 = 1.00 -> interval per "group"
    //(groupSpace * barSpace) * n + groupSpace = 1
    //()*13
    let startYear = 0


    chartData.barWidth = barWidth;
    barChartView.xAxis.axisMinimum = Double(startYear)
    let gg = chartData.groupWidth(groupSpace: groupSpace, barSpace: barSpace)
    print("Groupspace: \(gg)")
//        barChartView.xAxis.axisMaximum = Double(startYear) + gg * Double(groupCount)
    barChartView.xAxis.axisMaximum = 25
    barChartView.groupBars(fromX: Double(startYear), groupSpace: groupSpace, barSpace: barSpace)
    //chartData.groupWidth(groupSpace: groupSpace, barSpace: barSpace)
    barChartView.notifyDataSetChanged()

    barChartView.data = chartData






    //background color
    barChartView.backgroundColor = UIColor(red: 189/255, green: 195/255, blue: 199/255, alpha: 1)

    //chart animation
    barChartView.animate(xAxisDuration: 1.5, yAxisDuration: 1.5, easingOption: .linear)
}

这不能正常工作我有重叠的条。 X 轴最大值不会自动创建。我不知道我在这里做错了什么。任何人都可以请告诉我我错在哪里。每组的条数为 13，组数可以变化到 50 个。

【问题讨论】：

标签： ios swift charts ios-charts

【解决方案1】：

它非常简单，您正在为barChartView 设置 groupBars。错了。

barChartView.groupBars(fromX: Double(startYear), groupSpace: groupSpace, barSpace: barSpace)

您必须为chartData 设置 groupBars。如下所示

chartData.groupBars(fromX: Double(startYear), groupSpace: groupSpace, barSpace: barSpace)

【讨论】：