macos – 核心数据崩溃报告：加载数组控制器中的sqlite3VdbeHalt

我需要一些帮助来弄清楚崩溃报告中可能发生的事情.这对我来说是一个不可重现的问题,但有些用户在发布时会反复遇到这种情况.

当应用程序启动时,我将一个包含NSObjectController的nib加载到ContactsListdisplaySource对象,并将一个NSArrayController加载为了peopleArrayController(它是ContactsListdisplaySource对象中的一个出口). peopleArrayController是从ContactsListdisplaySource refetchArrayController中的数据库中获取联系人列表的内容：

- (void) refetchArrayController {

    NSError *error = nil;
    [_peopleArrayController fetchWithRequest:nil merge:NO error:&error];
    if (error) {
        NSLog(@"error in peopleArrayController fetch = %@",error);
    }
}

编辑：请注意,这是从awakeFromNib调用的,并且使用fetch：而不是fetchWithRequest：merge：error返回0行

这有99％的时间可以工作,但我想弄清楚这个崩溃报告中发生了什么.崩溃报告中是否有任何可以解释问题的线索？

Date/Time:       2015-04-22 12:17:17 +0000
OS Version:      Mac OS X 10.10.3 (14D136)
Report Version:  104

Exception Type:  SIGSEGV
Exception Codes: SEGV_NOOP at 0x0
Crashed Thread:  0

Thread 0 Crashed:
0   libsqlite3.dylib                     0x00007fff8e3770ad sqlite3VdbeHalt + 7741
1   libsqlite3.dylib                     0x00007fff8e3bd9c7 sqlite3VdbeExec + 93206
2   libsqlite3.dylib                     0x00007fff8e3a53df sqlite3_step + 734
3   CoreData                             0x00007fff91126710 _execute + 112
4   CoreData                             0x00007fff911389b8 -[NSsqliteConnection fetchResultSet:usingFetchPlan:] + 1880
5   CoreData                             0x00007fff91140719 newFetchedRowsForFetchPlan_MT + 2217
6   CoreData                             0x00007fff9112cea8 -[NSsqlCore objectsForFetchRequest:inContext:] + 520
7   CoreData                             0x00007fff9112c90b -[NSsqlCore executeRequest:withContext:error:] + 299
8   CoreData                             0x00007fff911e1389 __65-[NSPersistentStoreCoordinator executeRequest:withContext:error:]_block_invoke + 3945
9   CoreData                             0x00007fff911eb5ab gutsOfBlockToNSPersistentStoreCoordinatorPerform + 171
10  libdispatch.dylib                    0x00007fff8eb62c13 _dispatch_client_callout + 7
11  libdispatch.dylib                    0x00007fff8eb63e5e _dispatch_barrier_sync_f_invoke + 56
12  CoreData                             0x00007fff911da5a2 _perform + 194
13  CoreData                             0x00007fff9112c5a5 -[NSPersistentStoreCoordinator executeRequest:withContext:error:] + 533
14  CoreData                             0x00007fff9112adfb -[NSManagedobjectContext executeFetchRequest:error:] + 587
15  AppKit                               0x00007fff91ddd745 -[_NSManagedProxy fetchObjectsWithFetchRequest:error:] + 69
16  AppKit                               0x00007fff91c1aacc -[NSArrayController(NSManagedController) _performFetchWithRequest:merge:error:] + 62
17  AppKit                               0x00007fff91ddcdc3 -[NSObjectController(NSManagedController) fetchWithRequest:merge:error:] + 176
18  Contacts Journal CRM                 0x000000010d0d8eb2 -[ContactsListdisplaySource refetchArrayController] (ContactsListdisplaySource.m:57)
19  Contacts Journal CRM                 0x000000010d0d8e6e -[ContactsListdisplaySource awakeFromNib] (ContactsListdisplaySource.m:47)
20  CoreFoundation                       0x00007fff8c736bdf -[NSSet makeObjectsPerformSelector:] + 223
21  AppKit                               0x00007fff917b214d -[NSIBObjectData nibInstantiateWithOwner:options:topLevelObjects:] + 1216
22  AppKit                               0x00007fff9198ca0e -[NSNib _instantiateNibWithExternalNaMetable:options:] + 677
23  AppKit                               0x00007fff9198c65e -[NSNib _instantiateWithOwner:options:topLevelObjects:] + 143
24  AppKit                               0x00007fff9198b957 -[NSViewController loadView] + 272
25  AppKit                               0x00007fff9190af03 -[NSViewController _loadViewIfrequired] + 75
26  AppKit                               0x00007fff9190ae6d -[NSViewController view] + 30
27  Contacts Journal CRM                 0x000000010d021078 -[AppDelegate displayVC:] (AppDelegate.m:496)
28  Contacts Journal CRM                 0x000000010d020ff8 -[AppDelegate changeViewControllersWithIndex:] (AppDelegate.m:414)
29  Contacts Journal CRM                 0x000000010d01edb6 -[AppDelegate postApplicationDidFinishLaunchingWithNotification:] (AppDelegate.m:130)
30  Contacts Journal CRM                 0x000000010d01ec00 -[AppDelegate applicationWillFinishLaunching:] (AppDelegate.m:114)
31  CoreFoundation                       0x00007fff8c7e645c __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12
32  CoreFoundation                       0x00007fff8c6d6634 _CFXNotificationPost + 3140
33  Foundation                           0x00007fff8f33d9d1 -[NSNotificationCenter postNotificationName:object:userInfo:] + 66
34  AppKit                               0x00007fff9180cf57 -[NSApplication finishLaunching] + 440
35  AppKit                               0x00007fff9180ca21 -[NSApplication run] + 128
36  AppKit                               0x00007fff91789354 NSApplicationMain + 1832
37  libdyld.dylib                        0x00007fff8d0cd5c9 start + 1

你可能认为这是非常基本的,但也许你可以试试这个：

[_peopleArrayController.managedobjectContext performBlockAndWait:
^{
    [_peopleArrayController fetchWithRequest:nil merge:NO error:&error];
}];

我发现在使用核心数据时使用managedobjectContext的performBlock：和performBlockAndWait：方法可以防止我的应用程序挂起.只需查看NSManagedobjectContext类引用https://developer.apple.com/library/ios/documentation/Cocoa/Reference/CoreDataFramework/Classes/NSManagedObjectContext_Class/即可