noDataText is not working

[Bharati555]

i have set the noDataText still its showing the empty white circle and not label
here is my code

override func viewDidLoad() {
super.viewDidLoad()
self.navigationItem.title = LocalizedString("Charts.Title")
piechartView.backgroundColor = self.view.backgroundColor
piechartView.holeColor = self.view.backgroundColor;
piechartView.delegate = self
piechartView.usePercentValuesEnabled = true;
piechartView.holeRadiusPercent = 0.58;
piechartView.transparentCircleRadiusPercent = 0.61;
piechartView.descriptionText = "";
piechartView.drawCenterTextEnabled = true;
piechartView.drawHoleEnabled = true;
piechartView.rotationAngle = 0.0;
piechartView.rotationEnabled = true;
piechartView.centerText = "Housekeeping";
piechartView.noDataText = "No Schedule Data"

}

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(true)
    self.setChartValues()
}

func setXValues(_ xValues: NSArray, yValues: NSArray) {

    var yVals1 : [ChartDataEntry]? = [ChartDataEntry]();

    for i in 0 ..< yValues.count {
        yVals1?.append(ChartDataEntry(value: (yValues.object(at: i) as AnyObject).doubleValue, xIndex: i) as ChartDataEntry)
    }

    let dataSet = PieChartDataSet(yVals: yVals1, label: "")

    if xValues.count > 1 {
        dataSet.sliceSpace = 3.0
    }

    dataSet.colors = colors

    let data = PieChartData(xVals: xValues as? [String] , dataSet:dataSet)

    let pFormatter = NumberFormatter();
    pFormatter.numberStyle = NumberFormatter.Style.percent;
    pFormatter.maximumFractionDigits = 1;
    pFormatter.roundingMode = .down
    pFormatter.multiplier = 1.0;
    pFormatter.percentSymbol = " %";
    data.setValueFormatter(pFormatter);
    data.setValueTextColor(UIColor.white)

    piechartView.data = data
    piechartView.highlightValues(nil)

    piechartView.setNeedsDisplay()
}

[liuxuan30]

you should not set chart data if you don't have data at all.