启用ios-charts雷达放大

Question

在swift 3中，我做了雷达计划

但我没有找到如何启用它的缩放功能，我甚至没有发现这是否可行。

以下是生成它的代码：

func Radar() {
    radarVw.xAxis.valueFormatter = self
    var dataEntries: [RadarChartDataEntry] = []
    for i in 0..<(useri?.skills!)!.count {
        let dataEntry = RadarChartDataEntry(value: (useri?.skills!)![i]["level"].double!)           
        dataEntries.append(dataEntry)
        skillsName.append((useri?.skills!)![i]["name"].string!)
    }

    let chartDataSet = RadarChartDataSet(values: dataEntries, label: "skills")

    let chartData = RadarChartData(dataSet: chartDataSet)
    radarVw.xAxis.labelHeight = 0.5
    radarVw.xAxis.labelWidth = 0.5
    radarVw.legend.enabled = false
    radarVw.xAxis.wordWrapEnabled = true

    radarVw.data = chartData
    radarVw.chartDescription?.text = ""
}