Scale a UIImage to fill both dimensions of the specified cropRect

ScaleUIImage.cs

public UIImage ScaleImageToFillCropRect(UIImage image, RectangleF cropRect)
{
	float frameXToYScale = cropRect.Height / cropRect.Width; 
	float imageXToYScale = image.Size.Height / image.Size.Width;
	float scaleFactor;
	
	// Decide if X or Y should be scaled
	if (imageXToYScale > frameXToYScale)
	{
		// Match X dimension of frame
		scaleFactor = 1 / (image.Size.Width / cropRect.Size.Width);
	}
	else
	{
		// Match Y dimension of frame
		scaleFactor = 1 / (image.Size.Height / cropRect.Size.Height);
	}
	
	var newImageRect = new RectangleF(0, 0, image.Size.Width * scaleFactor, image.Size.Height * scaleFactor);
	
	UIGraphics.BeginImageContextWithOptions(newImageRect.Size, false, 0);
	var context = UIGraphics.GetCurrentContext();
	
	// Flip the image to prepare for display
	context.TranslateCTM(0.0f, cropRect.Size.Height);
	context.ScaleCTM(1.0f, -1.0f);
	
	// Draw the image in an appropriately-scaled rect
	context.DrawImage(newImageRect, image.CGImage);
	
	var scaledImage = UIGraphics.GetImageFromCurrentImageContext();
	UIGraphics.EndImageContext();
	
	return scaledImage;
}