iPhone 在 CoreData 保存时崩溃

Question

这与 this question 的情况不同，因为提供的解决方案不起作用并且堆栈不同。

使用 coredata 保存数据时定期崩溃。

堆栈跟踪并不是 100% 清楚发生这种情况的位置，但我确信正在调用的是这个例程。它可以是此方法中的 save:，也可以是下面的方法。

代码:

-(void)saveWine {
    if ([self validInfo]) {
        Wine *wine =  (Wine *)wineToEdit;
        if (wine == nil) {
            wine = (Wine *)[NSEntityDescription insertNewObjectForEntityForName:@"Wine" inManagedObjectContext:self.managedObjectContext];
        }
        wine.uuid = [Utils createUUID];
        wine.name = self.wineNameField.text;
        wine.vineyard = self.vineyardField.text;
        wine.vintage = [[self numberFormatter] numberFromString:self.vintageField.text];
        wine.timeStamp = [NSDate date];
        wine.rating = [NSNumber numberWithInt:self.ratingControl.selectedSegmentIndex];
        wine.partnerRating = [NSNumber numberWithInt:self.partnerRatingControl.selectedSegmentIndex];
        wine.varietal = self.currentVarietal;
        wine.tastingNotes = self.currentTastingNotes;
        wine.dateTasted = self.currentDateTasted;
        wine.tastingLocation = [[ReferenceDataAccessor defaultReferenceDataAccessor] addEntityForType:TASTING_LOCATION 
                                                                                             withName:self.currentWhereTasted];

        id type = [[ReferenceDataAccessor defaultReferenceDataAccessor] entityForType:WINE_TYPE 
                                                                          withOrdinal:self.typeControl.selectedSegmentIndex];
        wine.type = type;
        NSError *error;
        NSLog(@"Saving %@",wine);
        if (![self.managedObjectContext save:&error]) {
            [Utils showAlertMessage:@"There was a problem saving your wine; try restarting the app" withTitle:@"Problem saving"];
            NSLog(@"Error while saving new wine %@, %@", error, [error userInfo]);
        }
    }
    else {
        NSLog(@"ERROR - someone is calling saveWine with invalid info!!");
    }
}

addEntityForType:withName:的代码:

-(id)addEntityForType:(NSString *)type withName:(NSString *)name {

    if ([Utils isStringBlank:name]) {
        return nil;
    }
    id existing = [[ReferenceDataAccessor defaultReferenceDataAccessor] entityForType:type withName:name];

    if (existing != nil) {
        NSLog(@"%@ with name %@ already exists",type,name);
        return existing;
    }


    NSManagedObject *newEntity = [NSEntityDescription insertNewObjectForEntityForName:type 
                                                               inManagedObjectContext:self.managedObjectContext];

    [newEntity setValue:name forKey:@"name"];

    NSError *error;
    if (![self.managedObjectContext save:&error]) {
        [Utils showAlertMessage:[NSString stringWithFormat:@"There was a problem saving a %@",type] withTitle:@"Database Probem"];
        [Utils logErrorFully:error forOperation:[NSString stringWithFormat:@"saving new %@",type ]];
    }
    return newEntity;
}

堆栈跟踪:

Thread 0 Crashed:
0   libSystem.B.dylib               0x311de2d4 __kill + 8
1   libSystem.B.dylib               0x311de2c4 kill + 4
2   libSystem.B.dylib               0x311de2b6 raise + 10
3   libSystem.B.dylib               0x311f2d72 abort + 50
4   libstdc++.6.dylib               0x301dea20 __gnu_cxx::__verbose_terminate_handler() + 376
5   libobjc.A.dylib                 0x319a2594 _objc_terminate + 104
6   libstdc++.6.dylib               0x301dcdf2 __cxxabiv1::__terminate(void (*)()) + 46
7   libstdc++.6.dylib               0x301dce46 std::terminate() + 10
8   libstdc++.6.dylib               0x301dcf16 __cxa_throw + 78
9   libobjc.A.dylib                 0x319a14c4 objc_exception_throw + 64
10  CoreData                        0x3526e83e -[NSManagedObjectContext save:] + 1098
11  Wine Brain                      0x0000651e 0x1000 + 21790
12  Wine Brain                      0x0000525c 0x1000 + 16988
13  Wine Brain                      0x00004894 0x1000 + 14484
14  Wine Brain                      0x00008716 0x1000 + 30486
15  CoreFoundation                  0x31477fe6 -[NSObject(NSObject) performSelector:withObject:withObject:] + 18
16  UIKit                           0x338c14a6 -[UIApplication sendAction:to:from:forEvent:] + 78
17  UIKit                           0x3395c7ae -[UIBarButtonItem(UIInternal) _sendAction:withEvent:] + 86
18  CoreFoundation                  0x31477fe6 -[NSObject(NSObject) performSelector:withObject:withObject:] + 18
19  UIKit                           0x338c14a6 -[UIApplication sendAction:to:from:forEvent:] + 78
20  UIKit                           0x338c1446 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 26
21  UIKit                           0x338c1418 -[UIControl sendAction:to:forEvent:] + 32
22  UIKit                           0x338c116a -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 350
23  UIKit                           0x338c19c8 -[UIControl touchesEnded:withEvent:] + 336
24  UIKit                           0x338b734e -[UIWindow _sendTouchesForEvent:] + 362
25  UIKit                           0x338b6cc8 -[UIWindow sendEvent:] + 256
26  UIKit                           0x338a1fc0 -[UIApplication sendEvent:] + 292
27  UIKit                           0x338a1900 _UIApplicationHandleEvent + 5084
28  GraphicsServices                0x35d66efc PurpleEventCallback + 660
29  CoreFoundation                  0x314656f8 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 20
30  CoreFoundation                  0x314656bc __CFRunLoopDoSource1 + 160
31  CoreFoundation                  0x31457f76 __CFRunLoopRun + 514
32  CoreFoundation                  0x31457c80 CFRunLoopRunSpecific + 224
33  CoreFoundation                  0x31457b88 CFRunLoopRunInMode + 52
34  GraphicsServices                0x35d664a4 GSEventRunModal + 108
35  GraphicsServices                0x35d66550 GSEventRun + 56
36  UIKit                           0x338d5322 -[UIApplication _run] + 406
37  UIKit                           0x338d2e8c UIApplicationMain + 664
38  Wine Brain                      0x000021ba 0x1000 + 4538
39  Wine Brain                      0x00002184 0x1000 + 4484

我不知道为什么我的应用程序的内存位置没有被符号定位，但代码路径仅导致两个 manavedObjectContext save: 调用。发生这种情况时，在整个 wine 上进行最终 save: 之前，一直调用 addEntityForType，为“whereTasted”实体创建一个新对象 对象。

当我再次执行相同的过程时，效果很好。这让我相信这与添加新位置时应用程序运行了一段时间有关，但我不确定。

关于如何调试此问题并在下次发生这种情况时获取更多信息有什么想法吗？

Answer 1

将 @try - @catch 放在您的保存调用周围。保存时似乎抛出异常:

9 libobjc.A.dylib 0x319a14c4 objc_exception_throw + 64

示例:

@try
{
    if (![self.context save:&error]) {
        [[NSApplication sharedApplication] presentError:error];

}
@catch (NSException * e)
{
    NSLog(@"exception saving: %@", e);
    abort();
}