Legend has only one label

[wow-such-amazing]

Hello.
I have pie chart. When it loads first time, then i can see my 6 labels in legend. But pieChart.legend.labels.count is equal 2 and labels are: "" and "myLabel".
Then i update my chart. The pie is perfect, but in the legend there is only one label exist.
pieChart.legend.labels.count is equal 2 and labels are: "" and "myLabel".
So, why in the first time i see 6 labels, but the real amount of labels is 2?

override func viewDidLoad() {
        super.viewDidLoad()

        pieChart.delegate = self

        setChart(segmentsName, pieValues: segmentsSumm, values: lineChartY, datePoints: lineChartDates)

        pieChart.alpha = 1

        var l = pieChart.legend
        l.position = ChartLegend.ChartLegendPosition.RightOfChart
        l.xEntrySpace = 7.0
        l.yEntrySpace = 0.0
        l.yOffset = 0.0
        pieChart.usePercentValuesEnabled = true
        pieChart.centerText = String(stringInterpolationSegment: totalIncome)
        pieChart.drawSliceTextEnabled = false
        pieChart.noDataText = "Нет данных"
        pieChart.animate(xAxisDuration: 2.0)

        lineChart.noDataText = "No Data"
        lineChart.xAxis.labelPosition = .Bottom
        lineChart.animate(yAxisDuration: 2.0)
        lineChart.rightAxis.enabled = false

        println("count = \(pieChart.legend.labels)") // it always equals 2

    }
func setChart(dataPoints: [String], pieValues: [Double], values: [Double], datePoints: [String]) {
        var pieDataEntries: [BarChartDataEntry] = []
        var lineDataEntries: [BarChartDataEntry] = []

        for i in 0..<dataPoints.count {
            let dataEntry = BarChartDataEntry(value: pieValues[i], xIndex: i)
            pieDataEntries.append(dataEntry)
        }

        let pieChartDataSet = PieChartDataSet(yVals: pieDataEntries, label: "")

        let pieChartData = PieChartData(xVals: dataPoints, dataSet: pieChartDataSet)

        pieChart.data = pieChartData

        var colors: [UIColor] = []

        for i in 0..<dataPoints.count {
            let red = Double(arc4random_uniform(256))
            let green = Double(arc4random_uniform(256))
            let blue = Double(arc4random_uniform(256))

            let color = UIColor(red: CGFloat(red/255), green: CGFloat(green/255), blue: CGFloat(blue/255), alpha: 1)
            colors.append(color)
        }
        pieChartDataSet.colors = colors


        for i in 0..<datePoints.count {
            let dataEntry = BarChartDataEntry(value: values[i], xIndex: i)
            lineDataEntries.append(dataEntry)
        }

        let chartDataSet = LineChartDataSet(yVals: lineDataEntries, label: "Units Sold")
        chartDataSet.drawCubicEnabled = true
        chartDataSet.cubicIntensity = 0.2
        chartDataSet.drawCirclesEnabled = false
        chartDataSet.lineWidth = 2.0
        chartDataSet.circleRadius = 5.0
        let chartData = LineChartData(xVals: lineChartDates, dataSet: chartDataSet)
        lineChart.data = chartData
    }

When i press the button on the pop controller the following code runs:

var tmpController :UIViewController! = self.presentingViewController
        self.dismissViewControllerAnimated(false, completion: {()->Void in
            tmpController.viewDidLoad()
        })

[wow-such-amazing]

any ideas?

[liuxuan30]

@crabman448
Legends will be created computed by computeLegend. Every time you change dataSet, it will trigger notifyDataSetChanged, and compute legend again. You could debug from here.

    public override func notifyDataSetChanged()
    {
        if (_dataNotSet)
        {
            return
        }

        calcMinMax()

        if (_legend !== nil)
        {
            _legendRenderer.computeLegend(_data)
        }

        calculateOffsets()

        setNeedsDisplay()
    }

[wow-such-amazing]

@liuxuan30
Thanks a lot! I just added swift pieChart.notifyDataSetChanged() to viedDidLoad method and everything started to work fine
Thank you

[liuxuan30]

@crabman448 hey usually you don't need to call this, when you change the dataSet, it will call it