1

我崩溃了（可能是在父 moc 保存时：

这就是 moc 的创建方式（父级）：

   if (_managedObjectContextInMemoryForDynamicInformation) return _managedObjectContextInMemoryForDynamicInformation;
    NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinatorInMemoryForDynamicInformation];
    if (!coordinator) {
        NSMutableDictionary *dict = [NSMutableDictionary dictionary];
        [dict setValue:@"Failed to initialize the store" forKey:NSLocalizedDescriptionKey];
        [dict setValue:@"There was an error building up the data file." forKey:NSLocalizedFailureReasonErrorKey];
        NSError *error = [NSError errorWithDomain:@"YOUR_ERROR_DOMAIN" code:9999 userInfo:dict];
        [[NSApplication sharedApplication] presentError:error];
        return nil;
    }
    _managedObjectContextInMemoryForDynamicInformation = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSMainQueueConcurrencyType];
    [_managedObjectContextInMemoryForDynamicInformation setPersistentStoreCoordinator:coordinator];
    [_managedObjectContextInMemoryForDynamicInformation setUndoManager:nil];
    return _managedObjectContextInMemoryForDynamicInformation;

孩子：

    AppDelegate *delegateMain = (AppDelegate *)[[NSApplication sharedApplication] delegate];
    _mocInMemoryForDynamicInformation = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSPrivateQueueConcurrencyType];
    [_mocInMemoryForDynamicInformation setUndoManager:nil];
    _mocInMemoryForDynamicInformation.parentContext = delegateMain.managedObjectContextInMemoryForDynamicInformation;

这就是我保存的方式：

-(void) finalSaveMocInMemoryForDynamicInformation;
{
    [_mocInMemoryForDynamicInformation performBlock:^{
        // do something that takes some time asynchronously using the temp context

        // push to parent
        NSError *error;
        if ([_mocInMemoryForDynamicInformation save:&error])
        {
            AppDelegate *delegateMain = (AppDelegate *)[[NSApplication sharedApplication] delegate];

            // save parent to disk asynchronously
            [delegateMain.managedObjectContextInMemoryForDynamicInformation performBlock:^{
                @try {
                    NSError *error;
                    if (![delegateMain.managedObjectContextInMemoryForDynamicInformation save:&error])
                    {
                        [self logError:error];
                    }
                }
                @catch (NSException *exception) {
                    NSLog(@"ERROR:%@:%@ exception->%@ inside managedObjectContextInMemoryForDynamicInformation",[self class], NSStringFromSelector(_cmd),exception);
                    //[[NSNotificationCenter defaultCenter] removeObserver:self name:NSManagedObjectContextDidSaveNotification object:moc];

                    return ;
                }

            }];
        } else [self logError:error];
    }];
}

应用程序特定信息： *由于未捕获的异常“NSObjectInaccessibleException”而终止应用程序，原因：“CoreData 无法满足“0x7fd8a71d87a0”的错误，调用终止调用抛出异常

Application Specific Backtrace 1: 0 CoreFoundation
0x00007fff86e6f0a6 __exceptionPreprocess + 198 1 libobjc.A.dylib
0x00007fff849353f0 objc_exception_throw + 43 2 CoreData
0x00007fff8737eec4 _PFFaultHandlerLookupRow + 1348 3 CoreData
0x00007fff8737e61f _PF_FulfillDeferredFault + 239 4 CoreData
0x00007fff873892cd _PF_ManagedObject_WillChangeValueForKeyIndex + 77 5 CoreData 0x00007fff8738cc51 _sharedIMPL_setvfk_core + 129 6 CoreData 0x00007fff873a4eaa -[ NSManagedObject(_NSInternalMethods) _didChangeValue:forRelationship:named:withInverse:] + 1434 7 基金会 0x00007fff878fe860 NSKeyValueNotifyObserver + 390 8 基金会
0x00007fff87900279 NSKeyValueDidChange + 456 9 基础
0x00007fff878bb7df -[NSObject(NSKeyValueObserverNotification) didChangeValueForKey:] + 130 10 CoreData
0x00007fff873898c1 -[NSManagedObject didChangeValueForKey:] + 113 11 CoreData 0x00007fff873e566d -[NSManagedObject(_NSInternalMethods) _updateFromRefreshSnapshot:includingTransients:] + 685 12 CoreData 0x00007fff873b0969 -[NSManagedObjectContext(_NestedContextSupport) _copyChildObject:toParentObject:fromChildContext:] + 121 13 CoreData 0x00007fff873b0505 -[NSManagedObjectContext( _NestedContextSupport) _parentProcessSaveRequest:inContext:error:] + 629 14 CoreData 0x00007fff873df72a __82-[NSManagedObjectContext(_NestedContextSupport) executeRequest:withContext:error:]_block_invoke_0 + 634 15 libdispatch.dylib 0x00007fff8aad6a2d 16_dispatch_in_parrier_sync7slowdylib 0x00007fff8aad10b6 _dispatch_client_callout + 8 17 libdispatch.dylib 0x00007fff8aad60c8 _dispatch_main_queue_callback_4CF + 275 18 CoreFoundation 0x00007fff86e110fe __CFRunLoopRun + 1614 19 CoreFoundation 0x00007fff86e106b2 CFRunLoopRunSpecific + 290 20 HIToolbox
0x00007fff89d950a4 RunCurrentEventLoopInMode + 209 21 HIToolbox
0x00007fff89d94e42 ReceiveNextEventCommon + 356 22 HIToolbox
0x00007fff89d94cd3 BlockUntilNextEventMatchingListInMode + 62 23 AppKit 0x00007fff8ffcd613 _DPSNextEvent + 685 24 AppKit 0x00007fff8ffcced2 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 128 25 AppKit 0x00007fff8ffc4283 -[NSApplication run] + 517 26 AppKit 0x00007fff8ff68cb6 NSApplicationMain + 869 27 个调用freecall
0x000000010e6ab472 main + 34 28 libdyld.dylib
0x00007fff858a47e1 开始 + 0 29 ???
0x0000000000000002 0x0 + 2

4

2 回答 2

1

目前，我找到了该崩溃的解决方案。

该代码中传递了崩溃：

    [_mocInMemoryForDynamicInformation obtainPermanentIDsForObjects:@[session] error:&error];

这是苹果中的已知错误，我无法获得永久 ID。如果我尝试在子上下文中执行此操作，则保存是崩溃的产品。

这就是我解决它的方法：

    [_mocInMemoryForDynamicInformation.parentContext obtainPermanentIDsForObjects:@[session] error:&error];

这个简单的解决方案解决了所有问题（我无法解释这是如何工作的）。

于 2013-06-17T08:22:38.877 回答
1

您的 var 标识符确实令人困惑。像 parentContext、child Context、rootContext 之类的名字是不是很棘手？

无论如何，问题可能不是保存操作。在第一个视图中，您似乎更改了一个对象与另一个对象的关系，但另一个对象不再存在。如果另一个对象在子上下文中出错并在存储中删除，则可能会发生这种情况。（可能是因为父上下文删除了对象并保存了它的状态。）

于 2013-06-11T15:47:40.247 回答