swiftのchartsを使ってグラフ下の表を複数表示する方法

プラグインのchartsで折れ線グラフを使用して
日々の体重を記録するアプリを作っているのですが、
グラフの日付の部分はで
日付は表示できるのですが、
その下に月を表示する方法がわからないです。

わかる方がいましたら教えていたでだきたいです

現在の状態

やりたい事

override func viewDidLoad() {
super.viewDidLoad()
var lineChartEntry  = [ChartDataEntry]()
var days:[String] = ["1", "2", "3", "4", "5", "6", "7"]

for i in 0 ..< 6 {
    let chartData = ChartDataEntry(x: Double(i), y: Double(0.4))
    lineChartEntry.append(chartData)
}
let lineChartDataSet = LineChartDataSet(entries: lineChartEntry, label: "nil")
lineChartDataSet.axisDependency = .left
lineChartDataSet.setColor(#colorLiteral(red: 1, green: 0.6304908395, blue: 0.7219088078, alpha: 1))
lineChartDataSet.setCircleColor(#colorLiteral(red: 1, green: 0.6304908395, blue: 0.7219088078, alpha: 1)) // our circle will be dark red
lineChartDataSet.lineWidth = 2.0
lineChartDataSet.circleRadius = 3.0 // the radius of the node circle
lineChartDataSet.fillAlpha = 1

let rect = CGRect(x:0, y: 60, width: self.view.frame.width, height: self.view.frame.height - 150)
lineChartView = LineChartView(frame: rect)
lineChartView.delegate = self
lineChartView.data = LineChartData(dataSet: lineChartDataSet)
lineChartView.xAxis.valueFormatter = IndexAxisValueFormatter(values: days)
lineChartView.xAxis.drawGridLinesEnabled = true
lineChartView.xAxis.avoidFirstLastClippingEnabled = true
lineChartView.xAxis.labelPosition = .bottom
lineChartView.xAxis.axisMinimum = Double(0)
lineChartView.leftAxis.labelTextColor = #colorLiteral(red: 1, green: 0.6304908395, blue: 0.7219088078, alpha: 1)
//タップ
lineChartView.highlightPerTapEnabled = true
//背景
lineChartView.drawGridBackgroundEnabled = true
lineChartView.rightAxis.drawGridLinesEnabled = false
lineChartView.rightAxis.drawAxisLineEnabled = false
lineChartView.rightAxis.drawLabelsEnabled = false
lineChartView.leftAxis.drawAxisLineEnabled = false
lineChartView.leftAxis.drawGridLinesEnabled = false
lineChartView.pinchZoomEnabled = false
lineChartView.doubleTapToZoomEnabled = false
lineChartView.legend.enabled = false
lineChartView.setVisibleXRangeMaximum(10.0)
lineChartView.xAxis.axisMaximum = Double(10.0)
lineChartView.moveViewToX(Double(self.period))
lineChartView.dragEnabled = true
lineChartView.doubleTapToZoomEnabled = false

var goal = "goal:5kg"
let limitLine = ChartLimitLine(limit: Double(5.0), label: goal)
limitLine.lineColor = #colorLiteral(red: 0.2108310461, green: 0.7607958913, blue: 0.7475245595, alpha: 1)
limitLine.lineDashLengths = [4]
limitLine.labelPosition = .topLeft
lineChartView.leftAxis.addLimitLine(limitLine)

view.addSubview(lineChartView)
}