Ios &引用；NSRANGE例外情况“；关于「；NSFetchedResultsController“；密码

我正在使用fetchResultsController并使用教程对代码进行必要的更改

以下代码中存在错误；行：

[[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:nil cacheName:@"Root"];

原因是,由于未捕获的异常“NSRangeException”而终止应用程序，原因：“-[NSPathStore2 characterAtIndex:]：索引（6）超出范围（2）”

你能帮我解决这个问题吗

- (NSFetchedResultsController *)fetchedResultsController {

if (_fetchedResultsController != nil) {
    return _fetchedResultsController;
}

NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription
                               entityForName:@"AnswerQuestionDetails" inManagedObjectContext:self.managedObjectContext];
[fetchRequest setEntity:entity];

//NSSortDescriptor *sort = [[NSSortDescriptor alloc]
 //                         initWithKey:@"aqDt.ID" ascending:NO];
//[fetchRequest setSortDescriptors:[NSArray arrayWithObject:sort]];

[fetchRequest setFetchBatchSize:20];

NSFetchedResultsController *theFetchedResultsController =
[[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:nil cacheName:@"Root"];
_fetchedResultsController = theFetchedResultsController;
_fetchedResultsController.delegate = self;

return _fetchedResultsController;

}

谢谢你的帮助，

---

E.

您是否更改了提取请求？向我们显示-（NSInteger）tableView:（UITableView*）tableView numberOfRowsInSection:（NSInteger）section{请为numberOfRowsInSection和cellForRowAtIndexPath添加代码。