Hi Bruno,
In order to modify the labels in the iOS Platform, you need to create a custom renderer and work with the native control. Eventually, I suggest you have a look at the
iOS Chart Control documentation for more information on what customizations can be achieved. More specifically, you can have a detailed look at the following page -
Point Labels: Customizations. I am here providing a possible implementation of a custom renderer that changes the color of the label:
//argument needed to register the renderer
[assembly: Xamarin.Forms.ExportRenderer(typeof(Telerik.XamarinForms.Chart.RadPieChart), typeof(MyChartRenderer))]
namespace TelerikXamarin.iOS.CustomRenderer
{
public class MyChartRenderer : Telerik.XamarinForms.ChartRenderer.iOS.PieChartRenderer
{
protected override TKChartDelegate CreateChartDelegate(RadPieChart chart)
{
return new MyChartDelegate(chart);
}
}
public class MyChartDelegate : Telerik.XamarinForms.ChartRenderer.iOS.PieChartDelegate
{
public MyChartDelegate(RadPieChart chart) : base(chart)
{
}
public override TKChartPointLabel LabelForDataPoint(TKChart chart, TKChartData dataPoint, string propertyName, TKChartSeries series, nuint dataIndex)
{
TKChartDataPoint chartDataPoint = (TKChartDataPoint)dataPoint;
return new MyChartPointLabel(chartDataPoint, series, chartDataPoint.DataXValue.ToString());
}
}
public class MyChartPointLabel : TKChartPointLabel
{
public MyChartPointLabel(TKChartDataPoint point, TKChartSeries series, string text) : base(point, series, text)
{
this.Style.TextColor = UIColor.White;
}
}
}
I have also attached a sample application for your reference. I hope it will be helpful.
Regards,
Stefan Nenchev
Progress Telerik
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