我的应用程序最近在加载tableview时因崩溃而被拒绝。我只能在运行ad-hoc构建时重现崩溃。这是崩溃日志：
Last Exception Backtrace:
0 CoreFoundation 0x30ecbe7e __exceptionPreprocess + 126
1 libobjc.A.dylib 0x3b2286c2 objc_exception_throw + 34
2 CoreFoundation 0x30ecf7b2 -[NSObject(NSObject) doesNotRecognizeSelector:] + 198
3 CoreFoundation 0x30ece0aa ___forwarding___ + 702
4 CoreFoundation 0x30e1cdc4 __forwarding_prep_0___ + 20
5 HSHacks 0x0011a368 -[FRepo initWithRepoInfo:andPersistence:] (FRepo.m:51)
6 HSHacks 0x00119b58 -[FRepoManager getLocalRepo:] (FRepoManager.m:85)
7 HSHacks 0x0011a1f0 +[FRepoManager getRepo:] (FRepoManager.m:126)
8 HSHacks 0x00132144 -[Firebase initWithUrl:] (Firebase.m:50)
9 HSHacks 0x000d0d8c -[ChatViewController viewDidLoad] (ChatViewController.m:61)
10 UIKit 0x33654956 -[UIViewController loadViewIfRequired] + 514
11 UIKit 0x33654714 -[UIViewController view] + 20
12 UIKit 0x3377bd8a -[UITabBarController transitionFromViewController:toViewController:transition:shouldSetSelected:] + 350
13 UIKit 0x3377bc1e -[UITabBarController transitionFromViewController:toViewController:] + 34
14 UIKit 0x3377bb2a -[UITabBarController _setSelectedViewController:] + 254
15 UIKit 0x33846840 -[UITabBarController _tabBarItemClicked:] + 268
16 UIKit 0x33684d9e -[UIApplication sendAction:to:from:forEvent:] + 86
17 UIKit 0x33684d3a -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 34
18 UIKit 0x338466f6 -[UITabBar _sendAction:withEvent:] + 366
19 UIKit 0x33684d9e -[UIApplication sendAction:to:from:forEvent:] + 86
20 UIKit 0x33684d3a -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 34
21 UIKit 0x33684d0e -[UIControl sendAction:to:forEvent:] + 42
22 UIKit 0x3367073e -[UIControl _sendActionsForEvents:withEvent:] + 370
23 UIKit 0x33684d9e -[UIApplication sendAction:to:from:forEvent:] + 86
24 UIKit 0x33684d3a -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 34
25 UIKit 0x33684d0e -[UIControl sendAction:to:forEvent:] + 42
26 UIKit 0x3367073e -[UIControl _sendActionsForEvents:withEvent:] + 370
27 UIKit 0x33684756 -[UIControl touchesEnded:withEvent:] + 590
28 UIKit 0x3364819c _UIGestureRecognizerUpdate + 5524
29 CoreFoundation 0x30e96f64 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 16
30 CoreFoundation 0x30e948f2 __CFRunLoopDoObservers + 282
31 CoreFoundation 0x30e94c3e __CFRunLoopRun + 734
32 CoreFoundation 0x30dff46c CFRunLoopRunSpecific + 520
33 CoreFoundation 0x30dff24e CFRunLoopRunInMode + 102
34 GraphicsServices 0x35b392e6 GSEventRunModal + 134
35 UIKit 0x336b4840 UIApplicationMain + 1132
36 HSHacks 0x000d7efa main (main.m:16)
37 libdyld.dylib 0x3b721ab2 tlv_initializer + 2
Thread 0 Crashed:
0 libsystem_kernel.dylib 0x3b7d81fc __pthread_kill + 8
1 libsystem_pthread.dylib 0x3b83fa4e pthread_kill + 54
2 libsystem_c.dylib 0x3b789028 abort + 72
3 libc++abi.dylib 0x3abd798a abort_message + 70
4 libc++abi.dylib 0x3abf06e2 default_terminate_handler() + 250
5 libobjc.A.dylib 0x3b228936 _objc_terminate() + 190
6 libc++abi.dylib 0x3abee1b0 std::__terminate(void (*)()) + 76
7 libc++abi.dylib 0x3abedd12 __cxa_rethrow + 98
8 libobjc.A.dylib 0x3b22880a objc_exception_rethrow + 38
9 CoreFoundation 0x30dff4e2 CFRunLoopRunSpecific + 638
10 CoreFoundation 0x30dff24e CFRunLoopRunInMode + 102
11 GraphicsServices 0x35b392e6 GSEventRunModal + 134
12 UIKit 0x336b4840 UIApplicationMain + 1132
13 HSHacks 0x000d7efa main (main.m:16)
14 libdyld.dylib 0x3b721ab4 start + 0
有人知道发生了什么事吗？
我认为它可能与viewDidLoad中的代码有关：
[self.firebase observeEventType:FEventTypeChildAdded withBlock:^(FDataSnapshot *snapshot) {
// Add the chat message to the array.
[self.chat addObject:snapshot.value];
// Reload the table view so the new message will show up.
[SVProgressHUD dismiss];
[self.chatTableView reloadData];
self.chatTextField.userInteractionEnabled = TRUE;
[self.chatTableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:self.chat.count-1 inSection:0] atScrollPosition:UITableViewScrollPositionBottom animated:NO];
}];
}