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POUIWebview crashes on loading certain pdf document on ios7 only
 

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    <p>I have <strong>iPhone application</strong> which uses <code>UIWebview</code> to show documents. When I try to open certain pdf file, the app crashes with this exception:</p> <pre><code>0 CoreFoundation 0x036925e4 __exceptionPreprocess + 180, 1 libobjc.A.dylib 0x02c2d8b6 objc_exception_throw + 44, 2 CoreFoundation 0x036923bb +[NSException raise:format:] + 139, 3 QuartzCore 0x0126bcaa _ZN2CA5Layer12set_positionERKNS_4Vec2IdEEb + 190, 4 QuartzCore 0x0126be69 -[CALayer setPosition:] + 68, 5 QuartzCore 0x0126c56f -[CALayer setFrame:] + 799, 6 UIKit 0x017e572c -[UIView(Geometry) setFrame:] + 302, 7 UIKit 0x01d14bcb -[UIWebPDFViewHandler didDetermineDocumentBounds:] + 161, 8 UIKit 0x01d0f2b4 -[UIWebPDFView didCompleteLayout] + 628, 9 WebKit 0x069cbac1 -[WebPDFViewPlaceholder _notifyDidCompleteLayout] + 161, 10 libobjc.A.dylib 0x02c3f81f -[NSObject performSelector:withObject:] + 70, 11 Foundation 0x026759d8 __NSThreadPerformPerform + 285, 12 CoreFoundation 0x0361b83f __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15, 13 CoreFoundation 0x0361b295 __CFRunLoopDoSources0 + 437, 14 CoreFoundation 0x0363829e __CFRunLoopRun + 910, 15 CoreFoundation 0x03637ac3 CFRunLoopRunSpecific + 467, 16 CoreFoundation 0x036378db CFRunLoopRunInMode + 123, 17 GraphicsServices 0x035bd9e2 GSEventRunModal + 192, 18 GraphicsServices 0x035bd809 GSEventRun + 104, 19 UIKit 0x0178ed3b UIApplicationMain + 1225, 20 Navigator 0x0000317d main + 141, 21 libdyld.dylib 0x041a570d start + 1 </code></pre> <p>Obviously this specific pdf document is corrupted, but the <code>UIWebview</code> crashes only on <strong>iOS7</strong>. on <strong>iOS6</strong> devices and simulator the file is not shown but the application survives.</p> <p>I would love if anyone could explain the source for this difference, and more important - how to avoid such situations from crashing my app.</p> <p>Edit: you can try and play with a sample project i have created to show the problem. The project is here: <a href="https://github.com/eliktz/testWebViewProject" rel="nofollow">https://github.com/eliktz/testWebViewProject</a> You can see how the application crashes on the corrupted file when running on <strong>ios7 simulator</strong>, and survives on <strong>ios6 simulator</strong></p>
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