ios - How to allow user to crop a fixed frame of an image iPhone -

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i trying find way allow user select part of image he/she wants use. crop size fixed, user can't adjust how big or small want photo.

in mind, screen display photo rectangle on it, user move around his/her touch. press "ok" , image cropped wherever rectangle was.

right code is:

(uiimage *)imagebycropping:(uiimage *)imagetocrop torect:(cgrect)rect {  cgimageref imageref = cgimagecreatewithimageinrect([imagetocrop cgimage], rect); uiimage *cropped = [uiimage imagewithcgimage:imageref]; cgimagerelease(imageref);  return cropped; }

this code automatically crops image center without giving user chance crop him/herself.

i'm thinking along lines of this: instagram example

in above image, user moves picture around in background until part within box want keep, while cropping rest. can zoom in , out on photo pinching.


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