线程1：EXC_BAD_ACCESS（代码= 2，地址= 0x7fff5450df68）

Question

我尝试从coredata获取数据并在使用NSFetchResultController的tableview中显示，但显示出这样的错误

线程1：EXC_BAD_ACCESS（code = 2，address = 0x7fff5450df68）目标c

- (NSFetchedResultsController *)fetchResultController {

    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    _mainContext = [appDelegate manageObjectContext];

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

    NSFetchRequest *request = [[NSFetchRequest alloc] init];
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"Student" inManagedObjectContext:_mainContext];
    [request setEntity:entity];
    //[request setFetchBatchSize:20];
    NSSortDescriptor *sort = [[NSSortDescriptor alloc] initWithKey:@"Student.name" ascending:NO];
    [request setSortDescriptors:[NSArray arrayWithObject:sort]];

    NSFetchedResultsController *theFetchResultController =[[NSFetchedResultsController alloc] initWithFetchRequest:request managedObjectContext:_mainContext sectionNameKeyPath:nil cacheName:@"Root"]; //this point show me error
    self.fetchResultController.delegate = theFetchResultController;

    return _fetchResultController;
}

请帮助解决此问题。

Answer 1

通过此语句会发生此问题

 self.fetchResultController.delegate = theFetchResultController;

更换它。

self.fetchResultController.delegate = self