Ios 条形图给出的是负值

我正在使用Charts API并实现chart。我是这方面的新手，没有Swift 3的适当文档

我尝试并实施了，但不知道如何消除y的负刻度。如何仅从0开始图形，使其不显示负y比例

下面是我的代码：

fileprivate func ChartViewProperty() {

    barChartView.xAxis.labelPosition = .bottom
    barChartView.chartDescription?.text = ""
    barChartView.fitBars = true
    barChartView.pinchZoomEnabled = false
    self.barChartView.rightAxis.enabled = false
    barChartView.animate(xAxisDuration: 2.0, yAxisDuration: 2.0)
    barChartView.animate(xAxisDuration: 2.0, yAxisDuration: 2.0, easingOption: .easeInBounce)

    barChartView.xAxis.valueFormatter = IndexAxisValueFormatter(values:months)
    barChartView.xAxis.granularity = 1
    value.append([jan,feb,mar,apr,may,jun,jly,aug,sep,oct,nov,dec])
    setChart(dataPoints: months, values: value)
}. 

图片：

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尝试设置axisMinValue属性

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我猜barChartView.xAxis.axisMinValue

这行删除了条形图中的所有负值：

fileprivate func ChartViewProperty() {

    //barChartView.xAxis.drawGridLinesEnabled = false
    barChartView.xAxis.drawAxisLineEnabled = false

    //barChartView
    barChartView.xAxis.drawLabelsEnabled = true

    //Space between x axis
    barChartView.xAxis.spaceMin  = 1.0
    barChartView.xAxis.spaceMax  = 1.0

    //Left axis bottom
    barChartView.leftAxis.spaceBottom = 0.0

    //Label Position
    barChartView.xAxis.labelPosition = .bottom

    //Description
    barChartView.chartDescription?.text = ""

    //Fit Bar
    barChartView.fitBars = false

    //Pinch Zoom
    barChartView.pinchZoomEnabled = false

    //Right x axis enabled
    self.barChartView.rightAxis.enabled = false

    //Animate barchart
    barChartView.animate(xAxisDuration: 2.0, yAxisDuration: 2.0)
    barChartView.animate(xAxisDuration: 2.0, yAxisDuration: 2.0, easingOption: .easeInBounce)
}

chartView.rightAxis.axisMinimum = 0

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我试过了，但没用。我做了barChartView.xAxis.axisMinValue=0.5有什么解决方案吗？试试这个barChartView.leftAxis.Axisminum=0这是问题的答案还是补充？