Comments on: Fixing Blurry Subviews

By: Wayne

Wayne — Mon, 28 Feb 2011 18:50:37 +0000

Hi Mark;

Thanks so much for the post! Like others this has been a thorn in my iPad project for weeks and I no idea to fix it. Although I didn’t use your code exactly I did use the following technique to “clear” up my problem.

//set the centerpoint for the loadingview
CGPoint centerpoint;

centerpoint.x = [UIScreen mainScreen].bounds.size.width / 2;
centerpoint.y = [UIScreen mainScreen].bounds.size.height / 2;

loadingDrawView.center = centerpoint;

//round up the frame position to prevent blurring
loadingDrawView.frame = CGRectMake(round(loadingDrawView.frame.origin.x),
round(loadingDrawView.frame.origin.y),
loadingDrawView.frame.size.width,
loadingDrawView.frame.size.height);

By: Marco

Marco — Tue, 14 Sep 2010 21:54:57 +0000

@Mark: Thanks for sharing this! I spent hours trying to figure this one out before I finally Googled the right keywords and stumbled on your post.

@Zaph: Thanks for your comment, my issue was actually with a 55 pixel height (width was even) and this was causing the issue. After resizing to 56 pixels, no more issue. I can’t believe how much time I lost on that stupid thing.

By: david

david — Sat, 21 Aug 2010 23:43:57 +0000

thank your great job ,that be helpful for me!

By: Sean O'Connor

Sean O'Connor — Mon, 08 Feb 2010 12:55:03 +0000

I had that problem with odd pixel sized UIImageViews I was using on a UIScrollView. Every time you scrolled the screen the app moved the UIImagViews so they appeared to stay still relative to the scrolling background. All the even pixel sized UIImageViews looked fine but the odd ones went blurry. If I hadn’t been lucky and had some even sized ones which worked I’d have just written it off as an un-fixable iPhone quirk!

By: Zaph

Zaph — Sun, 17 Jan 2010 16:18:41 +0000

Rendering an UIImage that is an odd number of pixels wide into a UIImageView of exactly the same width and with an origin on integer values also causes pixel smearing. A workaround is to make the image 1 pixel wider.