Custom legend textcolor disappearing after selection

[Yunuen Sanchez]

I customized the legend labels on a Pie Chart using the following code:

for (nuint i = 0; i < chart.Legend.Container.ItemCount; i++) {
     TKChartLegendItem item = chart.Legend.Container.ItemAtIndex (i);
     item.Label.TextColor = UIColor.White;
     item.BackgroundColor = UIColor.Black;
}

Everything looks fine until I select one of the points. The TextColor of the label goes back to its original Black color. BackgroundColor remains black, only TextColor changed.

What I am missing?

Thanks

[Jack]

Hi Yunuen,

You should implement TKChartDelegate and override its UpdateLegendItem method in this scenario. It will be called every time when a legend item needs to be updated. Consider the following sample:

class ChartDelegate: TKChartDelegate
{
    public override void UpdateLegendItem (TKChart chart, TKChartLegendItem item, TKChartSeries series, nuint index)
    {
        item.Label.TextColor = UIColor.Red;
    }
}

Set the chart delegate before adding the chart to the superview and before setting the Hidden property of chart legend to false:

chart.Delegate = new ChartDelegate ();
this.View.AddSubview (chart);

Do not hesitate to contact us if you have further questions.

Regards,
Jack
Telerik

 

 

[Yunuen Sanchez]

It works! Thanks Jack.