StackOverflow2013

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copied!<blockquote> <p>I did some playing around with the native Photos app, and I think I can say with confidence they are using a single UIScrollView. The giveaway is this: zoom in on an image, and pull to the left or right. You will see the next or previous photo. If you tug hard enough, it will even page to the next photo at 1.0f zoom. Flip back and the previously zoomed photo will be back to 1.0f zoom as well.</p> </blockquote> <p>This is wrong. I'm using nested scrollviews, and getting exactly the same effect. If you're using some memory management scheme (which I had to start using... my page number is fairly high ('bout 50 each in 2 scrollViews)), then you can use a mechanism similar to whatever you have triggering your page loads / unloads to trigger a zoom reset for the pages -1 and +1 from the current page.</p> <p>I suspect that apple sets this off as soon as the previous pic has disappeared.</p> <p>What I don't understand is how to achieve smooth scrolling between pages - there's always a very short hang at the moment of transition. Do not get it. I've gotten pretty deep into fixing it - NSInvocationOperations were my first stop, then I made a reusable views queue for the page views (which retain their image views)... still this durned hang.</p> <p>I only have one NSOperationQueue running, and I've tried fiddling with the max number of concurrent operations. My thought was that the main thread was getting clogged by competing Queues, or maybe even one queue trying to do to much... still, the hang.</p> <p>I even tried creating super low-qual versions of my media, in case that was the problem. With each image weighing in at around 10k (these are jpegs, mind you)... you guessed it. The hang's still there.</p> <p>I'm pretty much resolved to do what I've done before and use TTPhotoViewController from Three20. I've spent some hours swimming through that code, and it's always a great education. At this point, though, I would really like to know where the heck this hang comes from, if only so I can spend my can't-sleep hours wondering about something less brain boiling.</p>

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