问删除核心数据对象和桌布

EN

-(void)saveTap:(id)sender{
    Entity *newManagedObject = [NSEntityDescription insertNewObjectForEntityForName:@"Entity" inManagedObjectContext:_managedObjectContext];
    [newManagedObject setValue:self.textfield.text forKey:@"playlistName"];
    [newManagedObject setValue:[NSNumber numberWithInt:selectedRowValue] forKey:@"idnumber"];



    // Save the context.
    NSError *error = nil;
    if (![_managedObjectContext save:&error]) {

        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
        abort();

    }

    [self fetchDevices];

    NSLog(@"COUNT %d", [devices count]);
}

- (void)tableView:(UITableView *)tableView commitEditingStyle:        (UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        [self.devices removeObjectAtIndex:indexPath.row];
        [tableViewData reloadData];    }
}