iOS Crash at [UIViewController setTitle] -

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i met crash symbolicated result:

ios9.3.1(13e238) exc_bad_access kern_invalid_address 0x000000001500c018 crashed: com.apple.main-thread 0  libobjc.a.dylib                0x18181db90 objc_msgsend + 16 1  foundation                     0x182a8e454 -[nsobject(nskeyvalueobservernotification) willchangevalueforkey:] + 324 2  quartzcore                     0x184c8711c ca::layer::set_delegate(objc_object*) + 72 3  uikit                          0x1872f2f40 -[uiview _createlayerwithframe:] + 580 4  uikit                          0x1872f2a00 uiviewcommoninitwithframe + 688 5  uikit                          0x1872f26f0 -[uiview initwithframe:] + 140 6  uikit                          0x1872f9fb0 -[uilabel initwithframe:] + 48 7  uikit                          0x187394f04 -[uinavigationitemview initwithnavigationitem:] + 200 8  uikit                          0x18761de4c -[uinavigationitem _defaulttitleview] + 128 9  uikit                          0x18761cfbc -[uinavigationitem _adddefaulttitleviewtonavigationbarifnecessary] + 88 10 uikit                          0x18739e610 -[uinavigationitem settitle:] + 260 11 uikit                          0x187392c90 -[uiviewcontroller settitle:] + 144 12 xxxxxxxxxxxxx                  0x100107634 -[zzfileviewcontroller viewdidload] (zzfileviewcontroller.m:133) 13 uikit                          0x1872f0b40 -[uiviewcontroller loadviewifrequired] + 996 14 uikit                          0x187308fd0 -[uiviewcontroller __viewwillappear:] + 132 15 uikit                          0x1874a3d10 -[uinavigationcontroller _startcustomtransition:] + 1052 16 uikit                          0x1873afd28 -[uinavigationcontroller _startdeferredtransitionifneeded:] + 688 17 uikit                          0x1873afa04 -[uinavigationcontroller __viewwilllayoutsubviews] + 60 18 uikit                          0x1873af96c -[uilayoutcontainerview layoutsubviews] + 208 19 uikit                          0x1872ec0e4 -[uiview(calayerdelegate) layoutsublayersoflayer:] + 656 20 quartzcore                     0x184c92a28 -[calayer layoutsublayers] + 148 21 quartzcore                     0x184c8d634 ca::layer::layout_if_needed(ca::transaction*) + 292 22 quartzcore                     0x184c8d4f4 ca::layer::layout_and_display_if_needed(ca::transaction*) + 32 23 quartzcore                     0x184c8cb24 ca::context::commit_transaction(ca::transaction*) + 252 24 quartzcore                     0x184c8c86c ca::transaction::commit() + 512 25 uikit                          0x1872eeef4 _uiapplicationhandleeventqueue + 4980 26 corefoundation                 0x18215d124 __cfrunloop_is_calling_out_to_a_source0_perform_function__ + 24 27 corefoundation                 0x18215cbb8 __cfrunloopdosources0 + 540 28 corefoundation                 0x18215a8b8 __cfrunlooprun + 724 29 corefoundation                 0x182084d10 cfrunlooprunspecific + 384 30 graphicsservices               0x18396c088 gseventrunmodal + 180 31 uikit                          0x187359f70 uiapplicationmain + 204 32 xxxxxxxxxxxxx                  0x100125c6c main (main.m:14) 33 libdispatch.dylib              0x181c228b8 (missing)

it shows crash @ [uiviewcontroller settitle], , title fetched model:

- (nonnull nsstring *)title {     nsstring *lastpath = [self.directorypath lastpathcomponent];     if (0 == [lastpath length]) {         lastpath = @"/";     }     return lastpath; }

from experience, exc_bad_access means sending message released object. here happens in viewdidload, uiviewcontroller released? besides, don't think title method has memory leak. i'm confused.

any suggestion?


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