Hello Stefan,

Yes, the string. Empty is a workaround for the X-axis, For Y-axis I can suggest the following:

public class CustomChartRenderer : CartesianChartRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<RadCartesianChart> e)
        {
            base.OnElementChanged(e);

            if (this.Control != null)
            {
                this.Control.YAxis.Title = "     ";
            }
        }
    }

where the space between the double quotes is the characters needed to visualize the value of the axis label. 

For example, in my case the text for the axis label is Data1, so I left 5 blank space characters.  

This is the approach I can suggest. I hope it will be helpful for the scenario you have.

Regards,
Author nickname
Progress Telerik

Hi Stefan,

Thank you for the provided images and explanation of the issue. This is a known issue and we have it logged in our feedback portal. Here is the link: https://feedback.telerik.com/xamarin/1366498-chart-ios-horizontalaxislabel-is-not-visible-when-only-one-data-is-applied-to-the-chart 

I will mark the type of this bug report "Duplicated". I can assure you that have raised the bug priority.

Workaround:

Create a custom renderer for iOS and set an empty string for its X-axis title, in this way the axis label value will be visualized. How to register chart renderer check here https://docs.telerik.com/devtools/xamarin/controls/chart/how-to/chart-how-to-register-custom-renderer

Here is how the CustomChartRenderer file looks:

using Telerik.XamarinForms.Chart;
using Telerik.XamarinForms.ChartRenderer.iOS;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;

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

namespace gauge.iOS
{
    public class CustomChartRenderer : CartesianChartRenderer
    {
        protected override void OnElementChanged(ElementChangedEventArgs<RadCartesianChart> e)
        {
            base.OnElementChanged(e);

            if (this.Control != null)
            {
                this.Control.XAxis.Title = string.Empty;
            }
        }
    }
}

Regards,

Didi
Progress Telerik