Comments on: Creating the ‘loupe’ or magnifying glass effect on the iphone.

By: Asif

Asif — Tue, 20 Nov 2012 06:12:27 +0000

How can i use it inside UIScrollView ?

By: Ramaraju

Ramaraju — Thu, 01 Sep 2011 11:04:35 +0000

Thanks a lot.

By: Joe Rickerby

Joe Rickerby — Fri, 02 Jul 2010 16:07:07 +0000

Hi Sean,
Thanks for this code, it’s really useful. I’d like to use it in an app I’m writing at the moment, what’s your stance on copyright/licensing?

Thanks,
Joe

By: Chadwick Wood

Chadwick Wood — Thu, 25 Mar 2010 18:01:50 +0000

Hey Sean, thanks for the wonderful article! I started out with your approach, then refined it to something that I think is simpler, and includes live updates. I wrote about it here if you’re interested: http://coffeeshopped.com/2010/03/a-simpler-magnifying-glass-loupe-view-for-the-iphone

Thanks,
Chadwick

By: dave

dave — Sun, 14 Feb 2010 16:33:59 +0000

Thanks a lot! Great work!

If the UIView contains UIImageViews with images having an alpha channel, the right side of the images or UIImageView are purple… It’s very bad if you use a image with rounded borders. Any idea how to fix that?

By: Sean Christmann

Sean Christmann — Tue, 09 Jun 2009 17:19:32 +0000

Thanks Elia, I’m still learning many of the C conventions myself and memory issues associated with certain conventions.

By: Elia Freedman

Elia Freedman — Sun, 24 May 2009 01:00:18 +0000

First, thanks so much for the code. Man, this was a life-saver. I’m decent with standard UI elements but the minute I have to dig into drawing my own custom UI elements, I’m lost. Since I needed a loupe, your code was perfect!

I made a change: I needed to change the loupe’s image on every move. I was able to do that but found, rather quickly, that MagnifierView.m ate up memory. Given your generosity in providing most of the code, I thought I would submit to you a small bug fix to deal with the memory leak issue.

In MagnifierView.m at the bottom of drawRect, I added the following three lines:
CGImageRelease(mask);
CGImageRelease(subImage);
CGImageRelease(xMaskedImage);

Thanks again.

By: epicjorge

epicjorge — Wed, 06 May 2009 06:46:06 +0000

You are missing a file from your project. Can you check it out and fix?