title: Stitch/Composite multiple images vertically and save as one image (iOS, objective-c)
body: <p>I need help writing an objective-c function that will take in an array of UIImages/PNGs, and return/save one tall image of all the images stitched together in order vertically.  I am new to this so please go slow and take it easy :)</p>
  
  <p>My ideas so far:
  Draw a UIView, then addSubviews to each one's parent (of the images)
  and then ???</p>