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POWhere can I learn more about WebCoreSharedBufferData?
 

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  1. POWhere can I learn more about WebCoreSharedBufferData?
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    <p>I've got an app that was working perfectly on iOS 6, but on iOS 7, if there is a very specific action taken by the user (too complex to get into but it uses a <code>UIWebView</code> and it's consistent), the app crashes with the error:</p> <pre><code>*** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[WebCoreSharedBufferData getBytes:range:]: range {0, 8} exceeds data length 0' </code></pre> <p>Now I'm more than happy to do some research and experimentation myself, but I just can't find <code>WebCoreSharedBufferData</code>. Google searches reveal several people (like <a href="https://stackoverflow.com/questions/19133178/ios-7-uiwebview-crashes-because-of-range-exception">here</a> and <a href="http://www.mapdotnet.com/index.php/developers-center/discussions/if-we-upgrade-the-ipad-application-to-the-new-ios-7-then-crashing" rel="nofollow noreferrer">here</a> and <a href="https://devforums.apple.com/message/900197#900197" rel="nofollow noreferrer">here</a> and <a href="https://stackoverflow.com/questions/19114191/application-crash-nsrangeexception">here</a>) who are having similar problems, but their questions either haven't been answered or they're using their apps in ways (like zooming on a map or using 3rd party code) that I'm not doing.</p> <p>Xcode documentation has never heard of <code>WebCoreSharedBufferData</code>, and a search of my project reveals no references to it. Google searches have left me unenlightened as well, mostly just questions and GitHub projects with 3rd party code I'm not using. I'm assuming it's something deep in Apple's <code>UIWebView</code> functionality, but without being able to learn more about it I'm having a hard time proceeding.</p> <p><strong>So my question is:</strong> does anyone know where I can find information/tutorials/descriptions etc of <code>WebCoreSharedBufferData</code>? I feel like if I understood it a little better I'd be able to find the solution, it's just hard to debug in the dark...</p> <p>Or alternatively, does anyone just straight-up know what changed with <code>WebCoreSharedBufferData</code> in iOS 7 that might be creating an error like this?</p> <p><strong>EDIT:</strong> A clue provided by kcbanner (who has experienced a similar issue) in the comments below: both of our problems involve pages with canvases and <code>onclick</code> events with those canvases. Maybe something has changed with canvas click handling in iOS 7?</p>
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    1. COWhat is the action taken by the user? I am having this issue as well and have not had success in tracking down the triggering event.
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    2. COIt was fairly complex and app-specific, where you'd need to visit a certain page in the `UIWebView` and call a certain JavaScript function on that page (having to do with creating and placing Canvas layers from an `onclick` event), then reload the page and try to call that same `onclick` function again. I'm not a JS guy and that's a really weird pattern, so I couldn't track it down beyond that, but the crash occurs 100% of the time when you follow those steps. How about you?
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    3. COA similar situation, we make use of canvases and click events on those canvases. Perhaps it is a bug with canvas click handlers.
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