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April 1, 2014 21:21
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Xamarin Pixate component, potential bug on Xcode 5.1
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| Under certain circumstances the Pixate library can cause an assertion error: | |
| > *** Assertion failure in -[UITableView _configureCellForDisplay:forIndexPath:], /SourceCache/UIKit_Sim/UIKit-2903.23/UITableView.m:6246 | |
| OR | |
| > *** Assertion failure in -[UITableView _configureCellForDisplay:forIndexPath:], /SourceCache/UIKit/UIKit-2935.137/UITableView.m:6509 | |
| Continuing through the assertion produces an unhandled exception, and stack traces. It turns out the most interesting part of the stack traces is the involvement of `[PXUITableView layoutSubviews]`. | |
| Apparently the Pixate library "takes over" the default UITableView class as soon as it's included in the project by the compiler: | |
| A. If you remove the Pixate library entirely, the problem stops. | |
| B. If you then add back just a reference to the Pixate library, the problem does not return. | |
| C. If you then add the following line (or any other use of the library) anywhere in the project, the problem _does_ return. | |
| `var x = PixateFreestyle.BuildDate;` | |
| This error might depend on the Xcode version used to compile the app. It definitely happens with Xcode 5.1. It might not happen with Xcode 5.0. The timing of adding a `UITableViewSource` to the `UITableView`, and calling `UITableView.ReloadData()` seem to play a part as well. | |
| ## Stack trace after continuing through the assertion error. | |
| Unhandled managed exception: Objective-C exception thrown. Name: NSInternalInconsistencyException Reason: UITableView dataSource must return a cell from tableView:cellForRowAtIndexPath: (MonoTouch.Foundation.MonoTouchException) | |
| at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr) | |
| at MonoTouch.UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x0004c] in /Developer/MonoTouch/Source/monotouch/src/UIKit/.pmcs-compat.UIApplication.cs:38 | |
| at SinDelantalMx.Application.Main (System.String[] args) [0x0002d] in /Volumes/Cases/iOS_UITableViewCell_ConfigureForDisplay_Assertion_BScheiman_2014_04_01/src/SinDelantalMx/Main.cs:15 | |
| mono-rt: Stacktrace: | |
| mono-rt: | |
| Native stacktrace: | |
| mono-rt: 0 libmonoboehm-2.0.dylib 0x03891ce7 mono_handle_native_sigsegv + 327 | |
| mono-rt: 1 libmonoboehm-2.0.dylib 0x038e737a sigabrt_signal_handler + 122 | |
| mono-rt: 2 libsystem_c.dylib 0x0446294b _sigtramp + 43 | |
| mono-rt: 3 ??? 0xffffffff 0x0 + 4294967295 | |
| mono-rt: 4 libsystem_sim_c.dylib 0x041f2e12 abort + 127 | |
| mono-rt: 5 SinDelantalMx 0x0020a813 monotouch_unhandled_exception_handler + 291 | |
| mono-rt: 6 libmonoboehm-2.0.dylib 0x0389252b mono_invoke_unhandled_exception_hook + 91 | |
| mono-rt: 7 libmonoboehm-2.0.dylib 0x0389153c mono_handle_exception_internal + 6588 | |
| mono-rt: 8 libmonoboehm-2.0.dylib 0x0388fb79 mono_handle_exception + 41 | |
| mono-rt: 9 libmonoboehm-2.0.dylib 0x038e0e49 mono_x86_throw_exception + 137 | |
| mono-rt: 10 ??? 0x0dfaae57 0x0 + 234532439 | |
| mono-rt: 11 SinDelantalMx 0x001fb9f1 monotouch_exception_handler + 177 | |
| mono-rt: 12 CoreFoundation 0x03f24a1d __handleUncaughtException + 749 | |
| mono-rt: 13 libobjc.A.dylib 0x03be0b5c _ZL15_objc_terminatev + 100 | |
| mono-rt: 14 libc++abi.dylib 0x03df9f60 _ZSt11__terminatePFvvE + 14 | |
| mono-rt: 15 libc++abi.dylib 0x03df997d _ZN10__cxxabiv1L22exception_cleanup_funcE19_Unwind_Reason_CodeP17_Unwind_Exception + 0 | |
| mono-rt: 16 libobjc.A.dylib 0x03be09cd _ZL26_objc_exception_destructorPv + 0 | |
| mono-rt: 17 CoreFoundation 0x03e94448 +[NSException raise:format:arguments:] + 136 | |
| mono-rt: 18 Foundation 0x00e26fee -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 116 | |
| mono-rt: 19 UIKit 0x015d33d5 __53-[UITableView _configureCellForDisplay:forIndexPath:]_block_invoke + 426 | |
| mono-rt: 20 UIKit 0x0154c3ef +[UIView(Animation) performWithoutAnimation:] + 82 | |
| mono-rt: 21 UIKit 0x0154c438 +[UIView(Animation) _performWithoutAnimation:] + 40 | |
| mono-rt: 22 UIKit 0x015d3226 -[UITableView _configureCellForDisplay:forIndexPath:] + 108 | |
| mono-rt: 23 UIKit 0x015d963d -[UITableView _createPreparedCellForGlobalRow:withIndexPath:] + 442 | |
| mono-rt: 24 UIKit 0x015d96f3 -[UITableView _createPreparedCellForGlobalRow:] + 69 | |
| mono-rt: 25 UIKit 0x015bd774 -[UITableView _updateVisibleCellsNow:] + 2378 | |
| mono-rt: 26 UIKit 0x015d0e95 -[UITableView layoutSubviews] + 213 | |
| mono-rt: 27 SinDelantalMx 0x001d0131 callSuper0 + 57 | |
| mono-rt: 28 SinDelantalMx 0x001d8e9d -[PXUITableView layoutSubviews] + 113 | |
| mono-rt: 29 UIKit 0x01555267 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 355 | |
| mono-rt: 30 libobjc.A.dylib 0x03bf281f -[NSObject performSelector:withObject:] + 70 | |
| mono-rt: 31 QuartzCore 0x00c952ea -[CALayer layoutSublayers] + 148 | |
| mono-rt: 32 QuartzCore 0x00c890d4 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 380 | |
| mono-rt: 33 QuartzCore 0x00c88f40 _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 26 | |
| mono-rt: 34 QuartzCore 0x00bf0ae6 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 294 | |
| mono-rt: 35 QuartzCore 0x00bf1e71 _ZN2CA11Transaction6commitEv + 393 | |
| mono-rt: 36 QuartzCore 0x00bf2544 _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 92 | |
| mono-rt: 37 CoreFoundation 0x03e5c4ce __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 30 | |
| mono-rt: 38 CoreFoundation 0x03e5c41f __CFRunLoopDoObservers + 399 | |
| mono-rt: 39 CoreFoundation 0x03e3a344 __CFRunLoopRun + 1076 | |
| mono-rt: 40 CoreFoundation 0x03e39ac3 CFRunLoopRunSpecific + 467 | |
| mono-rt: 41 CoreFoundation 0x03e398db CFRunLoopRunInMode + 123 | |
| mono-rt: 42 GraphicsServices 0x04b139e2 GSEventRunModal + 192 | |
| mono-rt: 43 GraphicsServices 0x04b13809 GSEventRun + 104 | |
| mono-rt: 44 UIKit 0x014ead3b UIApplicationMain + 1225 | |
| mono-rt: 45 ??? 0x0e74f590 0x0 + 242546064 | |
| mono-rt: 46 ??? 0x0e74e124 0x0 + 242540836 | |
| mono-rt: 47 ??? 0x0e4d4cdc 0x0 + 239946972 | |
| mono-rt: 48 ??? 0x0e4d4e5f 0x0 + 239947359 | |
| mono-rt: 49 libmonoboehm-2.0.dylib 0x037ee96b mono_jit_runtime_invoke + 843 | |
| mono-rt: 50 libmonoboehm-2.0.dylib 0x039a0bef mono_runtime_invoke + 127 | |
| mono-rt: 51 libmonoboehm-2.0.dylib 0x039a65e1 mono_runtime_exec_main + 401 | |
| mono-rt: 52 libmonoboehm-2.0.dylib 0x039a63a4 mono_runtime_run_main + 628 | |
| mono-rt: 53 libmonoboehm-2.0.dylib 0x0385c8ed mono_jit_exec + 93 | |
| mono-rt: 54 SinDelantalMx 0x001f46f4 main + 2788 | |
| mono-rt: 55 libdyld.dylib 0x043e4725 start + 0 | |
| mono-rt: | |
| ================================================================= | |
| Got a SIGABRT while executing native code. This usually indicates | |
| a fatal error in the mono runtime or one of the native libraries | |
| used by your application. | |
| ================================================================= |
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