Update Donut chart Xamarin iOS

Hello Jonas,

Thanks for reporting this. It looks like an issue in sciChart and I’ve already created task in our bugtracker, so it will be fixed in one of our future releases.

As for now, what you can do – is manually trigger redraw by calling invalidateElement on your series like below:

myDonut.InvalidateElement();

That’s it. Sorry for inconvenience. Hope this is suitable for your needs.

Best Regards,
Nazar

Hi Nazar, sorry for late response. Still not working for me, I’ve made some changes in your provided test application Xamarin.Examples.Deploy. In the code below I expected the pie chart to auto-update every 5000ms, but it is not. However, if I click somewhere in the pie chart, it will update to the expected value. But I want it to update automatically. The InvalidateElement-command doesn’t seem to affect at all.

    SCIDonutRenderableSeries donutSeries = new SCIDonutRenderableSeries();
    SCIPieSegment segment;
    protected override void InitExample()
    {
        donutSeries.IsVisible = false;
        segment = BuildSegmentWithValue(40, "Green", new SCIRadialGradientBrushStyle(0xff84BC3D, 0xff5B8829));
        donutSeries.Segments.Add(segment);
        donutSeries.Segments.Add(BuildSegmentWithValue(10, "Red", new SCIRadialGradientBrushStyle(0xffe04a2f, 0xffB7161B)));
        donutSeries.Segments.Add(BuildSegmentWithValue(20, "Blue", new SCIRadialGradientBrushStyle(0xff4AB6C1, 0xff2182AD)));
        donutSeries.Segments.Add(BuildSegmentWithValue(15, "Yellow", new SCIRadialGradientBrushStyle(0xffFFFF00, 0xfffed325)));
        donutSeries.DrawLabels = true;

        Surface.RenderableSeries.Add(donutSeries);
        Surface.RenderableSeries.Add(donutSeries);
        Surface.HoleRadius = 100;
        Surface.BackgroundColor = UIColor.White;

        var legendModifier = new SCIPieLegendModifier();
        legendModifier.Position = SCILegendPosition.Bottom;
        legendModifier.PieSeries = donutSeries;

        Surface.ChartModifiers.Add(legendModifier);
        Surface.ChartModifiers.Add(new SCIPieSelectionModifier());

        Task.Run(() =>
        {
            donutSeries.StartAnimation();
            donutSeries.IsVisible = true;
        });

        System.Threading.Timer t = new System.Threading.Timer(callback, null, 100, 5000);
    }
    Random rnd = new Random();
    private void callback(object state)
    {
        segment.Value = rnd.Next(1, 20);

        donutSeries.InvalidateElement();
    }

Hi…Is that syncfusion is free to use.I saw that it is not free one.We need to download the trial version for one month and work on that syncfusion studio .I would like to know is there any package apart from oxyplot we can use them and design graphs,piecharts by adding the package or adding the components to xamarin studio.

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