Pie chart data labels not in correct position.

[PrajeetShrestha]

Hello,
I am using ur library and the data labels are not correctly rendered in the PieChart. Shouldn't be it in the middle of the PieChart slices?

I initialized data set as :
PieChartData *data = [[PieChartData alloc] initWithXVals:nil dataSet:dataSet];
Is there any other way to remove the data labels as well?

[danielgindi]

This is very weird, as it works in the demo perfectly. Can you show us your code?

Or maybe play with the demo a little until you find the line that makes all the difference?

[PrajeetShrestha]

- (void)chartSetup {

    _chartView.delegate = self;
    _chartView.usePercentValuesEnabled = NO;
    _chartView.holeTransparent = YES;
    _chartView.centerTextFont = [UIFont fontWithName:@"HelveticaNeue-Light" size:12.f];
    _chartView.holeRadiusPercent = 0.58;
    _chartView.transparentCircleRadiusPercent = 0.61;
    _chartView.descriptionText = @"";
    _chartView.drawCenterTextEnabled = YES;
    _chartView.drawHoleEnabled = YES;
    _chartView.rotationAngle = 0.0;
    _chartView.rotationEnabled = NO;
    _chartView.centerText = @"14 Total Reports";
    [_chartView animateWithXAxisDuration:1.5 yAxisDuration:1.5 easingOption:ChartEasingOptionEaseOutBack];

    NSArray *dataSet = @[@1, @3 , @34];
    [self setPieData:dataSet];
}

- (void)setPieData:(NSArray *)values
{

    NSMutableArray *yVals1 = [[NSMutableArray alloc] init];
    for (int i = 0; i < values.count; i++)
    {
        double sliceValue = [values[i] doubleValue];
        [yVals1 addObject:[[BarChartDataEntry alloc] initWithValue:sliceValue xIndex:i]];
    }

    PieChartDataSet *dataSet = [[PieChartDataSet alloc] initWithYVals:yVals1 label:@""];
    dataSet.sliceSpace = 0.0;
    dataSet.colors = @[UIColorFromRGB(0xD37D7C),kAppThemeColor,UIColorFromRGB(0x6592CA)];

    PieChartData *data = [[PieChartData alloc] initWithXVals:nil dataSet:dataSet];
    NSNumberFormatter *pFormatter = [[NSNumberFormatter alloc] init];
    pFormatter.numberStyle = kCFNumberFormatterNoStyle;
    pFormatter.maximumFractionDigits = 0;
    pFormatter.multiplier = @1.f;
    [data setValueFormatter:pFormatter];
    [data setValueFont:[UIFont fontWithName:@"HelveticaNeue-Light" size:14.0f]];
    [data setValueTextColor:UIColor.whiteColor];
    _chartView.data = data;
}

This is my exact code for displaying pie. Playing around with it since a while couldn't figure out :)

[PrajeetShrestha]

Oh I managed to fix this by removing the line where we set the rotationAngle of chart to :

_chartView.rotationAngle = 0.0;
May be some calculation error on setting the rotation of Pie ?

[danielgindi]

No, it's not that at all.

You've not set x-values to the data. It tries to render the labels for the x-values below the values, but has nothing to render.
If you want to avoid rendering of x-values, you have to:

_chartView.drawSliceTextEnabled = NO;

[PrajeetShrestha]

That solved the issue! :) Thank you! And it's awesome library ! 👍

[anfriis]

I have the same problem, but am unable to fix it using the solution above.

I want the labels on the screenshot to also be aligned in the middle of the slice.

Here is my Swift code for setting up the Pie Chart:

        usePercentValuesEnabled = false
        drawHoleEnabled = false
        drawCenterTextEnabled = false
        drawSliceTextEnabled = false

        legend.enabled = false
        rotationEnabled = false

        highlightPerTapEnabled = false

        usePercentValuesEnabled = true

        noDataText = ""
        descriptionText = ""

        setNeedsDisplay()

And when i set values in the chart:

        var yVals = [ChartDataEntry]()
        var colors = [UIColor]()

        if let noAnswer = p.noAnswer where noAnswer != 0 {
            yVals.append(BarChartDataEntry(value: Double(noAnswer), xIndex: 0) as ChartDataEntry)
            colors.append(Answer.noColor)
        }

        if let yesAnswer = p.yesAnswer where yesAnswer != 0 {
            let index = (yVals.count == 0) ? 0 : 1
            yVals.append(BarChartDataEntry(value: Double(yesAnswer), xIndex: index) as ChartDataEntry)
            colors.append(Answer.yesColor)
        }

        // Create the data set with y values
        let dataSet = PieChartDataSet(yVals: yVals, label: "")
        dataSet.colors = colors
        dataSet.sliceSpace = 0


        // Get empty string for each y val, so the num of xVals equals the num of yVals
        let xVals = yVals.map { _ in "" }

        let data = PieChartData(xVals: xVals, dataSets: [dataSet])

        data.setValueFont(UIFont.defaultFont(.Regular, size: 9))
        data.setValueTextColor(UIColor.whiteColor())

        self.data = data
        self.highlightValues(nil)

        self.animate(xAxisDuration: 1.1, yAxisDuration: 1.1, easingOption: ChartEasingOption.EaseOutCirc)

Would be fantastic if someone could help :)