由于饼图中过度拥挤，标签值重叠

Question

我正在制作饼图。由于多个数据，饼图的文本值重叠，如下图所示。我没有得到如何在没有重叠标签的情况下分离出这些数据

我的代码是

         pieChartDataSet.colors = colors
        pieChartDataSet.valueFormatter = ChartValueFormatter()

        pieChartDataSet.valueLinePart1Length = 0.7
        pieChartDataSet.valueLinePart2Length = 0.3
        //pieChartDataSet.valueLinePart1OffsetPercentage = 80.0
        pieChartDataSet.valueLineColor = .black;
        pieChartDataSet.valueTextColor = .black;
        pieChartDataSet.valueFont = UIFont(name: "Verdana", size: 8.0)!
        pieChartDataSet.valueLineVariableLength = true
        pieChartDataSet.yValuePosition = .outsideSlice;
        pieChartDataSet.xValuePosition = .outsideSlice;