ImageEntry bu kısım ortak katmanda yazılmalıdır.

ImageEntry.cs

public class ImageEntry : Entry
    {
        public  ImageEntry(){
            this.HeightRequest = 50;
        }
		public static readonly BindableProperty ImageProperty =
            BindableProperty.Create(nameof(Image), typeof(string), typeof(ImageEntry), string.Empty);

		public static readonly BindableProperty LineColorProperty =
            BindableProperty.Create(nameof(LineColor), typeof(Xamarin.Forms.Color), typeof(ImageEntry), Color.White);

		public static readonly BindableProperty ImageHeightProperty =
			BindableProperty.Create(nameof(ImageHeight), typeof(int), typeof(ImageEntry), 40);

		public static readonly BindableProperty ImageWidthProperty =
			BindableProperty.Create(nameof(ImageWidth), typeof(int), typeof(ImageEntry), 40);

		public static readonly BindableProperty ImageAlignmentProperty =
			BindableProperty.Create(nameof(ImageAlignment), typeof(ImageAlignment), typeof(ImageEntry), ImageAlignment.Left);

		public Color LineColor
		{
			get { return (Color)GetValue(LineColorProperty); }
			set { SetValue(LineColorProperty, value); }
		}

		public int ImageWidth
		{
			get { return (int)GetValue(ImageWidthProperty); }
			set { SetValue(ImageWidthProperty, value); }
		}

		public int ImageHeight
		{
			get { return (int)GetValue(ImageHeightProperty); }
			set { SetValue(ImageHeightProperty, value); }
		}

		public string Image
		{
			get { return (string)GetValue(ImageProperty); }
			set { SetValue(ImageProperty, value); }
		}

		public ImageAlignment ImageAlignment
		{
			get { return (ImageAlignment)GetValue(ImageAlignmentProperty); }
			set { SetValue(ImageAlignmentProperty, value); }
		}
	}

	public enum ImageAlignment
	{
		Left,
		Right
	}
}