Extension method on SKSpriteNode which tiles a texture and applies it to the sprite.

SKSpriteNodeExtensions.cs

/// <summary>
/// Creates a tiled texture and applies it to the <see cref="SKSpriteNode"/>.
/// </summary>
/// <param name="spriteNode">The <see cref="SKSpriteNode"/> to which the texture is applied.</param>
/// <param name="texture">The texture used as tiles.</param>
/// <param name="coverageSize">The size of the finished tiled texture.</param>
public static void TileSprite(this SKSpriteNode spriteNode, UIImage texture, CGSize coverageSize) {
  var textureSize = new CGRect(CGPoint.Empty, texture.Size);

  UIGraphics.BeginImageContext(coverageSize);
  var context = UIGraphics.GetCurrentContext();
  context.DrawTiledImage(textureSize, texture.CGImage);
  var tiledBackground = UIGraphics.GetImageFromCurrentImageContext();
  UIGraphics.EndImageContext();

  spriteNode.Texture = SKTexture.FromImage(tiledBackground.CGImage);
  spriteNode.Size = coverageSize;
}