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我在應用程序中檢測到罕見的崩潰。堆棧跟蹤沒有幫助。它不直接關係到我的代碼：什麼樣的事情會導致viewWillLayoutSubviews在後臺線程中運行？
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSAttributeDictionary textContainerForAttributedString:containerSize:lineFragmentPadding:]: unrecognized selector sent to instance 0x1b8d89c0'
Last Exception Backtrace:
0 CoreFoundation 0x2e23bfd3 __exceptionPreprocess + 131
1 libobjc.A.dylib 0x38ab2ccf objc_exception_throw + 38
2 CoreFoundation 0x2e23f967 -[NSObject(NSObject) doesNotRecognizeSelector:] + 202
3 CoreFoundation 0x2e23e253 ___forwarding___ + 706
4 CoreFoundation 0x2e18d7f8 __forwarding_prep_0___ + 24
5 UIFoundation 0x35e77a25 __NSStringDrawingEngine + 12204
6 UIFoundation 0x35e749a7 -[NSString(NSExtendedStringDrawing) drawWithRect:options:attributes:context:] + 150
7 UIKit 0x30a70d21 -[UILabel _drawTextInRect:baselineCalculationOnly:] + 4224
8 UIKit 0x30ad7009 -[UILabel drawTextInRect:] + 500
9 UIKit 0x30ad6e0b -[UILabel drawRect:] + 78
10 UIKit 0x30ad6da5 -[UIView(CALayerDelegate) drawLayer:inContext:] + 372
11 QuartzCore 0x307042c1 -[CALayer drawInContext:] + 100
12 QuartzCore 0x306ede3f CABackingStoreUpdate_ + 1854
13 QuartzCore 0x307c8d6d ___ZN2CA5Layer8display_Ev_block_invoke + 52
14 QuartzCore 0x306ed6f3 x_blame_allocations + 82
15 QuartzCore 0x306ed39b CA::Layer::display_() + 1106
16 QuartzCore 0x306d103d CA::Layer::display_if_needed(CA::Transaction*) + 208
17 QuartzCore 0x306d0cd5 CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 24
18 QuartzCore 0x306d06df CA::Context::commit_transaction(CA::Transaction*) + 230
19 QuartzCore 0x306d04ef CA::Transaction::commit() + 314
20 QuartzCore 0x306fda83 CA::Transaction::release_thread(void*) + 162
21 libsystem_pthread.dylib 0x390dd68d _pthread_tsd_cleanup + 164
22 libsystem_pthread.dylib 0x390dd40b _pthread_exit + 86
23 libsystem_pthread.dylib 0x390de17d pthread_exit + 28
24 Foundation 0x2eb7846f +[NSThread exit] + 10
25 Foundation 0x2ec24a7d __NSThread__main__ + 1092
26 libsystem_pthread.dylib 0x390de919 _pthread_body + 140
27 libsystem_pthread.dylib 0x390de88b _pthread_start + 102
28 libsystem_pthread.dylib 0x390dcaa4 thread_start + 8
因此，我試圖添加更多的調試信息，以瞭解更多關於崩潰。我可以找到viewWillLayoutSubviews的痕跡。它在後臺被調用。如果我發現它在後臺，我可以退出該功能。但這是一個骯髒的黑客。我想通過阻止「東西」在後臺線程中使應用程序調用viewWillLayoutSubviews來正確解決此問題。
我還找不到那些「東西」，因爲堆棧跟蹤沒有幫助。
frame #1: 0x32946d16 UIKit`-[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 314
frame #2: 0x325c462a QuartzCore`-[CALayer layoutSublayers] + 142
frame #3: 0x325bfe3a QuartzCore`CA::Layer::layout_if_needed(CA::Transaction*) + 350
frame #4: 0x325bfccc QuartzCore`CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 16
frame #5: 0x325bf6de QuartzCore`CA::Context::commit_transaction(CA::Transaction*) + 230
frame #6: 0x325bf4ee QuartzCore`CA::Transaction::commit() + 314
frame #7: 0x325eca82 QuartzCore`CA::Transaction::release_thread(void*) + 162
frame #8: 0x3af0568c libsystem_pthread.dylib`_pthread_tsd_cleanup + 164
frame #9: 0x3af0540a libsystem_pthread.dylib`_pthread_exit + 86
frame #10: 0x3af0617c libsystem_pthread.dylib`pthread_exit + 28
frame #11: 0x30a6746e Foundation`+[NSThread exit] + 10
frame #12: 0x30b13a7c Foundation`__NSThread__main__ + 1092
frame #13: 0x3af06918 libsystem_pthread.dylib`_pthread_body + 140
frame #14: 0x3af0688a libsystem_pthread.dylib`_pthread_start + 102`
什麼是那些「事物」？
是否使用自動佈局查看 – 2014-08-31 10:31:14
堆棧跟蹤可能實際上是有用的，因爲處理UILabel上的屬性字典導致堆棧跟蹤崩潰。你的類型在IB的某個地方，或者只是在代碼中。出於某種原因，系統期望帶有歸屬文本的標籤然而，標籤被返回是一個普通的標籤 – 2014-08-31 10:38:21
@EmelElias我沒有筆尖，我沒有使用自動佈局。 – frankish 2014-08-31 14:36:21