UITableViewCell with bottom-centered fixed-width image

UITableViewDelegate.swift

// MARK: - UITableViewDelegate methods
	override func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
		let margin: CGFloat = 8
		var size = CGSize(width: cell.bounds.height - margin, height: cell.bounds.height - margin)

		if cell.imageView!.image!.size.width > cell.imageView!.image!.size.height {
			let factor = cell.imageView!.image!.size.width / cell.imageView!.image!.size.height;
			size.height = size.height / factor;
		}
		else {
			let factor = cell.imageView!.image!.size.height / cell.imageView!.image!.size.width;
			size.width = size.width / factor;
		}

		UIGraphicsBeginImageContextWithOptions(CGSize(width: cell.bounds.height, height: cell.bounds.height), false, 0)
		let frame = CGRect(x: (cell.bounds.height - size.width) / 2, y: (cell.bounds.height - size.height) - margin/4, width: size.width, height: size.height)

		cell.imageView?.image!.draw(in: frame)
		cell.imageView?.image = UIGraphicsGetImageFromCurrentImageContext()!
		UIGraphicsEndImageContext()
	}