How to use CustomRenderer for a single ContentPage in Xamarin.iOS and Xamarin.Android

Issue

I need to change the height of the Progress bar but just for a specific ContentPage, not for all my ContentPage’s. I got the code where i change the progress bar height:

public class CustomProgressBarRenderer : ProgressBarRenderer
{
    protected override void OnElementChanged(
    ElementChangedEventArgs<Xamarin.Forms.ProgressBar> e)
    {
        base.OnElementChanged(e);

        Control.ProgressTintColor  Color.FromRgb(0, 0, 0).ToUIColor();// This changes the color of the progress
    }


    public override void LayoutSubviews()
    {
        base.LayoutSubviews();

        var X  1.0f;
        var Y  10.0f; // This changes the height

        CGAffineTransform transform  CGAffineTransform.MakeScale(X, Y);
        Control.Transform  transform;
    }
}

i’d like to know if it is really possible. Thanks in advance.

Solution

If your App navigation is:

• Based on Shell

  public class CustomProgressBarRenderer : ProgressBarRenderer
  {
  protected override void OnElementChanged(
  ElementChangedEventArgs e)
  {
  base.OnElementChanged(e);

      if (Shell.Current.CurrentPage.GetType().Name.Equals("YourPageNme"))
      {
           Control.ProgressTintColor  Color.FromRgb(0, 0, 0).ToUIColor();
      }
  }
  
  
  public override void LayoutSubviews()
  {
      base.LayoutSubviews();
  if (Shell.Current.CurrentPage.GetType().Name.Equals("YourPageNme"))
  {
       var X  1.0f;
       var Y  10.0f; // This changes the height
  
       CGAffineTransform transform  CGAffineTransform.MakeScale(X, Y);
       Control.Transform  transform;
  }
  }
  
  }

• Based on NavigationPage

Replace

   Shell.Current.CurrentPage?.GetType().Name.Equals("YourPageNme")

With

(App.Current.MainPage as NavigationPage)?.CurrentPage?.GetType().Name?.Equals("YourPageNme")

Answered By – Cfun