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我一直有这个问题现在几天，这真的令人沮丧..我一直在审查我的代码反复尝试不同的事情，并继续有同样的问题..只有50％的时间不会总是这样。这使得它更难..核心数据：错误：异常被发现在核心数据更改处理
的问题，
我解析从3个CSV文件中的数据，以我的核心数据，它总是解析文件的2顺利，但中间的/第二个文件是哪里崩溃总是发生，所以这将是该文件的文件和managedObjectContext类的地址。
错误消息
CoreData: error: Serious application error.
Exception was caught during Core Data change processing. This is usually a bug within an observer of NSManagedObjectContextObjectsDidChangeNotification.
-[__NSCFSet addObject:]: attempt to insert nil with userInfo (null)
2014-09-12 11:27:06.115 AppName[210:3907] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFSet addObject:]: attempt to insert nil'
所以，在我FetchData类我尝试用不同的方式来解决这个问题。
- 首先，我更改了我的.csv文件，并将N/A插入到空的所有字段/单元格中。
- 其次，我正在检查我的FetchData类，如果它没有任何值，则保存N/A。
- 第三，在我开始解析数据的视图控制器中，我现在已经在我的核心数据中为这3个实体分隔了三个不同的属性。
@property (nonatomic, strong) NSManagedObjectContext *managedObjectContext;
@property (nonatomic, strong) NSManagedObjectContext *managedObjectContextGI;
@property (nonatomic, strong) NSManagedObjectContext *managedObjectContextVA;
这可能是一个有点疯狂或什么，但我真的需要解决这个问题的话，尝试任何可能的解决方案或接近这一点，总是好的，我想。
视图控制器来调用函数来完成解析..
//at the beginning of my model
#define kBgQueue dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
-(IBAction)myLoadingTask:(id)sender{
dispatch_async(kBgQueue, ^{
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSString *savedValue = @"";
if([[userDefaults stringForKey:@"dataFetched"] length] > 0){
savedValue = [userDefaults stringForKey:@"dataFetched"];
}
// if the csv files data hasn't been fetch it, then fetch it
if([savedValue length] == 0){
FetchData *fd = [[FetchData alloc] initWithManagedContext:self.managedObjectContext];
// fetching benefits data
[fd beginParser];
FetchGIBillData *fdGI = [[FetchGIBillData alloc] initWithManagedContext:self.managedObjectContextGI];
// fetching gi bill data
[fdGI beginParser];
FetchVAPhones *fdVA = [[FetchVAPhones alloc] initWithManagedContext:self.managedObjectContextVA];
// fetching va phones
[fdVA beginParser];
NSString *valueToSave = @"saved";
[[NSUserDefaults standardUserDefaults] setObject:valueToSave forKey:@"dataFetched"];
[[NSUserDefaults standardUserDefaults] synchronize];
}
});
}
这是我核心数据模型等功能..我已经进行了检查，如果它是空保存N /一个等等..我所有的性能，这是在我的实体是串
#define GIBILL_FILENAME @"gi_bill_data"
int numOfEntries;
- (id)initWithManagedContext:(NSManagedObjectContext*)managedObjectContext
{
self.managedObjectContext = managedObjectContext;
arrayOfRecords = [[NSMutableArray alloc] init];
numOfEntries=0;
return self;
}
- (void) beginParser
{
if (self.managedObjectContext == nil){
// Error: Must pass in NSManagedObjectContext
return;
}
NSString *filePath = [[NSBundle mainBundle] pathForResource:GIBILL_FILENAME ofType:@"csv"];
NSInputStream *stream = [NSInputStream inputStreamWithFileAtPath:filePath];
NSStringEncoding encoding = NSUTF8StringEncoding;//NSWindowsCP1250StringEncoding;
CHCSVParser *parser = [[CHCSVParser alloc] initWithInputStream:stream usedEncoding:&encoding delimiter:','];
parser.delegate = self;
[parser parse];
// uncomment to update data x amount of dates
//[self checkDateForRefreshCSV:parser];
}
* *这是节省的地方！ *
#pragma mark - Data Add
/**
* addRows
* @param parser: the CHCSV parser that will parse if required refresh
* @brief: add the row to ths managedObjectContent DB. All values saved.
*/
- (void) addRows:(CHCSVParser *)parser
{
int i = -1;
if ([arrayOfRecords count] == 0) return;
GIBill *data = [NSEntityDescription
insertNewObjectForEntityForName:@"GIBill"
inManagedObjectContext:self.managedObjectContext];
if([[arrayOfRecords objectAtIndex:++i] length] > 2)
data.facility_code = [arrayOfRecords objectAtIndex:i];
else
data.facility_code = @"N/A";
if([[arrayOfRecords objectAtIndex:++i] length] > 2)
data.institution = [arrayOfRecords objectAtIndex:i];
else
data.institution = @"N/A";
if([[arrayOfRecords objectAtIndex:++i] length] > 2)
data.city = [arrayOfRecords objectAtIndex:i];
else
data.city = @"N/A";
if([[arrayOfRecords objectAtIndex:++i] length] > 2)
data.state = [arrayOfRecords objectAtIndex:i];
else
data.state = @"N/A";
if([[arrayOfRecords objectAtIndex:++i] length] > 2)
data.country = [arrayOfRecords objectAtIndex:i];
else
data.country = @"N/A";
if([[arrayOfRecords objectAtIndex:++i] length] > 2)
data.bah = [arrayOfRecords objectAtIndex:i];
else
data.bah = @"N/A";
if([[arrayOfRecords objectAtIndex:++i] length] > 2)
data.poe = [arrayOfRecords objectAtIndex:i];
else
data.poe = @"N/A";
if([[arrayOfRecords objectAtIndex:++i] length] > 2)
data.yr = [arrayOfRecords objectAtIndex:i];
else
data.yr = @"N/A";
if([[arrayOfRecords objectAtIndex:++i] length] > 2)
data.gibill = [arrayOfRecords objectAtIndex:i];
else
data.gibill = @"N/A";
if([[arrayOfRecords objectAtIndex:++i] length] > 0)
data.cross = [arrayOfRecords objectAtIndex:i];
else
data.cross = @"N/A";
if([[arrayOfRecords objectAtIndex:++i] length] > 2)
data.grad_rate = [arrayOfRecords objectAtIndex:i];
else
data.grad_rate = @"N/A";
if([[arrayOfRecords objectAtIndex:++i] length] > 2)
data.grad_rate_rank = [arrayOfRecords objectAtIndex:i];
else
data.grad_rate_rank = @"N/A";
if([[arrayOfRecords objectAtIndex:++i] length] > 2)
data.default_rate = [arrayOfRecords objectAtIndex:i];
else
data.default_rate = @"N/A";
if([[arrayOfRecords objectAtIndex:++i] length] > 2)
data.avg_stu_loan_debt = [arrayOfRecords objectAtIndex:i];
else
data.avg_stu_loan_debt = @"N/A";
if([[arrayOfRecords objectAtIndex:++i] length] > 2)
data.avg_stu_loan_debt_rank = [arrayOfRecords objectAtIndex:i];
else
data.avg_stu_loan_debt_rank = @"N/A";
if([[arrayOfRecords objectAtIndex:++i] length] > 2)
data.indicator_group = [arrayOfRecords objectAtIndex:i];
else
data.indicator_group = @"N/A";
if([[arrayOfRecords objectAtIndex:++i] length] > 2)
data.salary = [arrayOfRecords objectAtIndex:i];
else
data.salary = @"N/A";
if([[arrayOfRecords objectAtIndex:++i] length] > 2)
data.zip = [arrayOfRecords objectAtIndex:i];
else
data.zip = @"N/A";
if([[arrayOfRecords objectAtIndex:++i] length] > 2)
data.ope = [arrayOfRecords objectAtIndex:i];
else
data.ope = @"N/A";
NSError *error;
[self.managedObjectContext save:&error];
}
好吧，我贴了最相关的代码，我认为这个问题的。请如果需要的东西或更多的细节问题让我知道，我会提供它..
在此先感谢！
添加例外破发点，并检查它是将空。 – 2014-09-12 16:06:46
您正在使用较旧的Core Data并发模型访问跨线程的上下文，这会导致很多问题。 – quellish 2014-09-12 16:07:20
您对旧版核心数据并发模型有何意义？ @quellish – NorthBlast 2014-09-12 16:13:48