Question

我有一个使用NSFetchedResultsController的UITableViewController。如果我删除谓词，它工作正常，但使用谓词，它会抛出错误的访问（EXC_BAD_ACCESS）。我启用了NSZombieEnabled，但没有任何结果。我正在使用ARC。我不明白！请帮忙。这是我的fetchedresultscontroller代码注意：将我的谓词更改为随机简单谓词，例如“unitNumber = nil”或“unitNumber LIKE％@”，unString仍然会导致崩溃，但是完全注释掉谓词不会导致崩溃（但后来我全部对象并没有明显的过滤器）：

- (NSFetchedResultsController *)fetchedResultsController
{
if (_fetchedResultsController != nil) {
    return _fetchedResultsController;
}

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

// Predicate
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"workTicket.appointment.scheduleRowPointer = %@", rp];
[self.fetchedResultsController.fetchRequest setPredicate:predicate];


// Sort Descriptor
NSSortDescriptor *unitNumberDescriptor = [[NSSortDescriptor alloc] initWithKey:@"unitNumber" ascending:YES];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:unitNumberDescriptor, nil];
[fetchRequest setSortDescriptors:sortDescriptors];

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

return _fetchedResultsController;
}

Answer 1

变化：

[self.fetchedResultsController.fetchRequest setPredicate:predicate];

到：

[fetchRequest setPredicate:predicate];

NSPredicate在NSFetchedResultsController中抛出EXC_BAD_ACCESS

1 个答案: