如何用ios-图表制作分组BarChart？

Question

我正在使用ios-图表库。

我想把我的逆变器值分组，这样每年都是一组。不幸的是，每年的每月价值可能有所不同。

我的数据json看起来如下：

{"monthlyData":[{"ERTRAG":"30.2989999055862","MONAT":"2","JAHR":"2016"},{"ERTRAG":"154.897000223398","MONAT":"1","JAHR":"2016"},{"ERTRAG":"141.996000155807","MONAT":"12","JAHR":"2015"},{"ERTRAG":"135.449000149965","MONAT":"11","JAHR":"2015"},{"ERTRAG":"319.437000751495","MONAT":"10","JAHR":"2015"},{"ERTRAG":"483.369997739792","MONAT":"9","JAHR":"2015"},{"ERTRAG":"698.112997770309","MONAT":"8","JAHR":"2015"},{"ERTRAG":"771.764000892639","MONAT":"7","JAHR":"2015"},{"ERTRAG":"736.611003398895","MONAT":"6","JAHR":"2015"},{"ERTRAG":"737.237999916077","MONAT":"5","JAHR":"2015"},{"ERTRAG":"720.181995391846","MONAT":"4","JAHR":"2015"},{"ERTRAG":"484.979001283646","MONAT":"3","JAHR":"2015"},{"ERTRAG":"249.974001646042","MONAT":"2","JAHR":"2015"},{"ERTRAG":"92.8830004036427","MONAT":"1","JAHR":"2015"},{"ERTRAG":"52.7970000207424","MONAT":"12","JAHR":"2014"},{"ERTRAG":"181.025999426842","MONAT":"11","JAHR":"2014"},{"ERTRAG":"332.789002537727","MONAT":"10","JAHR":"2014"},{"ERTRAG":"482.244999885559","MONAT":"9","JAHR":"2014"},{"ERTRAG":"602.811999320984","MONAT":"8","JAHR":"2014"},{"ERTRAG":"699.872003316879","MONAT":"7","JAHR":"2014"},{"ERTRAG":"828.212007522583","MONAT":"6","JAHR":"2014"},{"ERTRAG":"679.010004997253","MONAT":"5","JAHR":"2014"},{"ERTRAG":"635.115998744965","MONAT":"4","JAHR":"2014"},{"ERTRAG":"559.617002010345","MONAT":"3","JAHR":"2014"},{"ERTRAG":"265.135001063347","MONAT":"2","JAHR":"2014"},{"ERTRAG":"165.272998273373","MONAT":"1","JAHR":"2014"},{"ERTRAG":"134.578999936581","MONAT":"12","JAHR":"2013"},{"ERTRAG":"153.774000287056","MONAT":"11","JAHR":"2013"},{"ERTRAG":"321.733997344971","MONAT":"10","JAHR":"2013"},{"ERTRAG":"482.768000483513","MONAT":"9","JAHR":"2013"},{"ERTRAG":"692.864000797272","MONAT":"8","JAHR":"2013"},{"ERTRAG":"846.429007053375","MONAT":"7","JAHR":"2013"},{"ERTRAG":"709.758005619049","MONAT":"6","JAHR":"2013"},{"ERTRAG":"532.493996858597","MONAT":"5","JAHR":"2013"},{"ERTRAG":"462.539998054504","MONAT":"4","JAHR":"2013"},{"ERTRAG":"419.105004012585","MONAT":"3","JAHR":"2013"},{"ERTRAG":"143.189998820424","MONAT":"2","JAHR":"2013"},{"ERTRAG":"78.720000628382","MONAT":"1","JAHR":"2013"},{"ERTRAG":"90.1430006623268","MONAT":"12","JAHR":"2012"},{"ERTRAG":"155.483000457287","MONAT":"11","JAHR":"2012"},{"ERTRAG":"348.231998205185","MONAT":"10","JAHR":"2012"},{"ERTRAG":"598.037001848221","MONAT":"9","JAHR":"2012"},{"ERTRAG":"729.740003108978","MONAT":"8","JAHR":"2012"},{"ERTRAG":"676.923998832703","MONAT":"7","JAHR":"2012"},{"ERTRAG":"694.879002094269","MONAT":"6","JAHR":"2012"},{"ERTRAG":"811.281997680664","MONAT":"5","JAHR":"2012"},{"ERTRAG":"489.765002369881","MONAT":"4","JAHR":"2012"},{"ERTRAG":"538.866001605988","MONAT":"3","JAHR":"2012"},{"ERTRAG":"277.856996208429","MONAT":"2","JAHR":"2012"},{"ERTRAG":"155.854999214411","MONAT":"1","JAHR":"2012"},{"ERTRAG":"148.157999750227","MONAT":"12","JAHR":"2011"},{"ERTRAG":"230.409998774529","MONAT":"11","JAHR":"2011"}]}

我尝试了以下几点：

var months = Array<String>()
var years = Array<String>()
var dataEntries: [BarChartDataEntry] = []
var dataSets: [BarChartDataSet] = []
var overallSum = 0.0
var year = 2010 //monthlyValues[0].year
var count = 0
var chartDataSet: BarChartDataSet?

for i in 0..<monthlyValues.count {
  // if year is different, create new barchartdataset
  if monthlyValues[i].year != year {
    years.append("\(monthlyValues[i].year)")
    chartDataSet = BarChartDataSet(yVals: dataEntries, label: "\(year)")
    chartDataSet!.colors = [UIColor.whiteColor()]
    dataSets.append(chartDataSet!)
    year = monthlyValues[i].year
    dataEntries = []
    //months = []
    count = 0
  }
  months.append("\(monthlyValues[i].month)")
  overallSum += monthlyValues[i].amount

  let dataEntry = BarChartDataEntry(value: monthlyValues[i].amount, xIndex: count)
  count++
  dataEntries.append(dataEntry)
}
let chartData = BarChartData(xVals: months, dataSets: dataSets)
self.barChartView.data = chartData

这将导致在图例中使用正确的年份标签的五个系列，但图表中没有组分隔符，而且每年的条数为4或5(预期为12)。

谢谢你对此的任何暗示！

Answer 1

你在这里出了点问题。现在，您正在为每年创建一个新的DataSet。

您需要做的是创建尽可能多的DataSets，在每个组中有一个DataSet表示每个组中的一个条。(例如，DataSet 1代表组的每个第一条，DataSet 2表示组的第二个条，.)

举个例子，想象一下这样的图表，每组4组，每组3小节。每一组代表一年。

财政报告()

• 上面所示的设置需要3个DataSets (每个组一个)
• 同一组中的条目具有相同的x-索引(例如，在第一组中，所有条目都具有x-索引0)
• 它共包含12个条目。
• 每个DataSet包含4个条目，条目x索引从0到3不等。

这里，您可以找到上面描述的场景的一个示例，并查看文档。

Answer 2

​

​

let months = ["Jan", "Feb", "Mar", "Apr", "May"]
    let unitsSold = [20.0, 4.0, 6.0, 3.0, 12.0]
    let unitsBought = [10.0, 14.0, 60.0, 13.0, 2.0]

     override func viewDidLoad() {
            super.viewDidLoad()
            // Do any additional setup after loading the view, typically from a nib.
            barChartView.delegate = self
            barChartView.noDataText = "You need to provide data for the chart."
            barChartView.chartDescription?.text = "sales vs bought "


            //legend
            let legend = barChartView.legend
            legend.enabled = true
            legend.horizontalAlignment = .right
            legend.verticalAlignment = .top
            legend.orientation = .vertical
            legend.drawInside = true
            legend.yOffset = 10.0;
            legend.xOffset = 10.0;
            legend.yEntrySpace = 0.0;


            let xaxis = barChartView.xAxis
            xaxis.valueFormatter = axisFormatDelegate
            xaxis.drawGridLinesEnabled = true
            xaxis.labelPosition = .bottom
            xaxis.centerAxisLabelsEnabled = true
            xaxis.valueFormatter = IndexAxisValueFormatter(values:self.months)
            xaxis.granularity = 1


            let leftAxisFormatter = NumberFormatter()
            leftAxisFormatter.maximumFractionDigits = 1

            let yaxis = barChartView.leftAxis
            yaxis.spaceTop = 0.35
            yaxis.axisMinimum = 0
            yaxis.drawGridLinesEnabled = false

            barChartView.rightAxis.enabled = false
           //axisFormatDelegate = self

            setChart()
        }

 func setChart() {
        barChartView.noDataText = "You need to provide data for the chart."
        var dataEntries: [BarChartDataEntry] = []
        var dataEntries1: [BarChartDataEntry] = []

        for i in 0..<self.months.count {

            let dataEntry = BarChartDataEntry(x: Double(i) , y: self.unitsSold[i])
            dataEntries.append(dataEntry)

            let dataEntry1 = BarChartDataEntry(x: Double(i) , y: self.self.unitsBought[i])
            dataEntries1.append(dataEntry1)

            //stack barchart
            //let dataEntry = BarChartDataEntry(x: Double(i), yValues:  [self.unitsSold[i],self.unitsBought[i]], label: "groupChart")



        }

        let chartDataSet = BarChartDataSet(values: dataEntries, label: "Unit sold")
        let chartDataSet1 = BarChartDataSet(values: dataEntries1, label: "Unit Bought")

        let dataSets: [BarChartDataSet] = [chartDataSet,chartDataSet1]
        chartDataSet.colors = [UIColor(red: 230/255, green: 126/255, blue: 34/255, alpha: 1)]
        //chartDataSet.colors = ChartColorTemplates.colorful()
        //let chartData = BarChartData(dataSet: chartDataSet)

        let chartData = BarChartData(dataSets: dataSets)


        let groupSpace = 0.3
        let barSpace = 0.05
        let barWidth = 0.3
        // (0.3 + 0.05) * 2 + 0.3 = 1.00 -> interval per "group" 

        let groupCount = self.months.count
        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)

        chartData.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)


    }

Answer 3

如果您注意到以上代码中的功能图表。有出租

 groupSpace = 0.3
 let barSpace = 0.05
 let barWidth = 0.3
 // (0.3 + 0.05) * 2 + 0.3 = 1.00 -> interval per "group" 

使方程(groupSpace * barSpace) *n+ groupSpace = 1

对于n个条形，你需要绕开这个等式。