Slicing an image in iOS -

I currently look for a single image (for example, captured by the photo library) in a number Can I have different rectangular pieces, can someone point me in the right direction?

  cgmajf top headerReplyReference = cImmejreitimethimageignet (original image.cgimage, cgreactec (0,0, original) Image. Wathth / 2, original image size.height / 2)); UIImage * topLeftImage = [UIImage imageWithCGImage: topLeftImageRef];