Create image in objective-

For use in a UIImage A class that creates and caches images based on given parameters: There are 9 colors and 4 sizes. Given a string like "11624324" return an image by combining images into one See sample in attachement figure. When combining the figures must have a small overlap, 5 px. Also the total size of the image must be the same regardless of the number of people in it. Upto 9 people. The height shall be 50 pixels. Background is transparent. There must also be a method to normalize this parameter string: it consists of pairs of colors and sizes and to normalize it, it must be sorted first by size and then by color. The images must be cached in the class after they are created.