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Set the width of chart candles

Environment

Product Version 2021.3.1110.1
Product Chart for Xamarin Cross-Platform

Description

This article will show you how to apply a width to the iOS Chart CandlesStickSeries.

Solution

The native TKChartCandlestickSeries inherits from TKChartOhlcSeries which inherits from TKChartColumnSeries. There are MaxColumnWidth and MinColumnWidth properties inside the TKChartColumnSeries.

Applying a width to the candles can be achieved using these two properties. The solution requires a custom renderer for iOS.

  1. Create a class inside the iOS project for example CustomChartRenderer which inherits from CartesianChartRenderer.

  2. Override the OnElementChanged method and implement the if statement to check whether the series is TKChartCandlestickSeries. Inside the if statement set MaxColumnWidth and MinColumnWidth:

using System.Linq;
using Telerik.XamarinForms.ChartRenderer.iOS;
using TelerikUI;
using TestACV.iOS;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;

[assembly: ExportRenderer(typeof(Telerik.XamarinForms.Chart.RadCartesianChart), typeof(CustomChartRenderer))]

namespace TestACV.iOS
{
    public class CustomChartRenderer : CartesianChartRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<Telerik.XamarinForms.Chart.RadCartesianChart> e)
        {
            base.OnElementChanged(e);
            if (this.Control != null)
            {
                if (this.Control.Series.FirstOrDefault() is TKChartCandlestickSeries series)
                {
                    series.MaxColumnWidth = 20;
                    series.MinColumnWidth = 15;
                }
            }
        }
    }
}
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