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我在https://github.com/danielgindi/ios-charts创建了带库的简单条形图仍然无法弄清楚如何将其作为分组条形图.我已经将已售出的单位数组添加到图表中,但不知道如何将unitBought数组添加到图表中以使其成为分组图表.请帮助.

@IBOutlet weak var barChartView: BarChartView!

override func viewDidLoad() {
    super.viewDidLoad()      
    months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
    let unitsSold = [20.0, 4.0, 6.0, 3.0, 12.0, 16.0, 4.0, 18.0, 2.0, 4.0, 5.0, 12.8]
    let unitsBought = [20.0, 4.0, 6.0, 3.0, 12.0, 16.0, 4.0, 18.0, 2.0, 4.0, 5.0, 12.8]
    setChart(months, values: unitsSold)
}


//functions
func setChart(dataPoints: [String], values: [Double]) {
    barChartView.noDataText = "You need to provide data for the chart."

    var dataEntries: …