let user crop image in iOS

Question

Is there a built in function in objective-c to do image cropping like the one in iOS photo gallery? I have tried enabling editing in UIImagePickerController, but it doesn't do the same. Thanks!

score 2 · Accepted Answer · answered Mar 02 '12 at 07:51

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there are quite a few ways to crop images using the Core Graphics functions, the most basic one would be:

CGRect cropRect = CGRectMake(0, 0, 100, 100);
CGImageRef cropped_img = CGImageCreateWithImageInRect(yourUIImage.CGImage, cropRect)

answered Mar 02 '12 at 07:51

Peter Sarnowski

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so if I want the user to define the portion of image they want cropped, I suppose I should implement UIGestureRecognizers? – atnatn Mar 02 '12 at 08:19
Yeah, there's a pretty good tutorial here: http://www.icodeblog.com/2010/10/14/working-with-uigesturerecognizers/ – Peter Sarnowski Mar 02 '12 at 08:24

score 0 · Answer 2 · edited May 23 '17 at 10:24

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This is no built in function. The way to do it would be to take the image an get a frame around the portion of the image you want.

This question should help you

edited May 23 '17 at 10:24

Community

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answered Mar 02 '12 at 07:51

Amit Shah

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that's too bad. I was hoping for an easy way out :p Thank you for confirming that. – atnatn Mar 02 '12 at 08:33

let user crop image in iOS

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