iphone app - Add a 'zoom' function

Hi. Simple task, it should be a few lines of code, however I have come to a brick wall in trying to implement this. What will happen: 1) User taps on a 'zoom' button. (already implemented) 2) User is presented with an UIAlert saying to tap on screen where they wish to zoom. 3) User taps somewhere on the UIView 4) The UIView is then zoomed to the tapped section. 5) User shakes the device to zoom out. I currently have the zooming implemented, just not to the area in which the user has tapped. I have this working by applying CGAffineTransformScale to the view. I am flexible on how this is done, so let me know if you want to try something different to achieve the zooming effect. (I have tried putting it into a uiscrollview, with little luck). This is a nice simple project, great for feedback building; all freelancers are welcome to bid. If you are accepted as the contractor, the project will be under a non-disclosure agreement. Project source files / information / details will not be shared with third parties without prior consent. By placing a bid, you agree to this. App details will be provided upon bid review. Thanks for looking!