核心数据插入行和保存问题

我在核心数据中保存数据时遇到了一些问题，并且还有行组织，为了更好地理解我的问题，我将解释我的内容：

我有一个使用动态行的主tableview，在这个tableview中我有一个按钮，每当按下按钮时，弹出框内会出现一个tableview，用户可以选择要在主tableview中插入的“单元格类型” . “单元格类型”是自定义单元格，它们有一个类和xib文件 . 每个自定义单元格都有各种文本字段...所以这个想法是：

• 选择一种单元格并插入主tableview中 .

• 用文本填充文本字段 .

• 保存的数据对应于插入的行数和文本字段中的数据 .

When calling the popover tableview i have this method in my main tableview:

- (IBAction)Add:(id)sender
{

SelectProduct *typeProduct=[[self.storyboard instantiateViewControllerWithIdentifier:@"selectTable"]initWithTableViewTag:self.tableView.tag];
self.popover=[[UIPopoverController alloc]initWithContentViewController:typeProduct];
[popover presentPopoverFromBarButtonItem:buttonAdd permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
typeProduct.popView = self.popover;
typeProduct.cellSelected = self.cellSelected; //cellSelected is core data subclass.
typeProduct.delegate = self;
typeProduct.managedObjectContext = self.managedObjectContext;
}

then in my didSelectRow of my popover tableview, i have:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
row = indexPath.row;

if (row == 0)
{
    cellSelected=[NSEntityDescription insertNewObjectForEntityForName:@"CellSave" inManagedObjectContext:self.managedObjectContext];
    cellSelected.nameCellData = @"Olive";
    cellSelected.amountData = myCostumCell.amount.text;   
}

From here, a cell is inserted in my main tableview, here´s my main tableview relevant methods:

- (void)viewDidLoad
{
[self.tableView registerNib:[UINib nibWithNibName:@"myCostumCellXib" bundle:nil] forCellReuseIdentifier:@"myCostumCell"];

AppDelegate *appDelegate =[[UIApplication sharedApplication] delegate];
self.managedObjectContext=[appDelegate managedObjectContext];

NSError *error = nil;
if (![self.fetchedResultsController performFetch:&error]) 
{
    // Replace this implementation with code to handle the error appropriately.
    // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
    NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
    abort();
}

[self fetchedResultsController];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

{
static NSString *CellIdentifier = @"myCostumCell";

cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
cell.cellSelected = self.cellSelected;
cell.managedObjectContext = self.managedObjectContext;

if (cell == nil)
{
    cell = [[MyCostumCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
cellSelected = [self.fetchedResultsController objectAtIndexPath:indexPath];
cell.nameCell.text = cellSelected.nameCellData;

if ([cellSelected.nameCellData isEqualToString:@"Olive"])
   {
    cell.amount.text = cellSelected.amountData;
    // i have more textfields to assign but i think you understand the rest..
   }
}

My fetchedResultsController method: ( also have the others but they are the standard stuff)

- (NSFetchedResultsController *)fetchedResultsController
{

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

// Create and configure a fetch request.
NSFetchRequest *fetchRequestCellSave = [[NSFetchRequest alloc] init];
NSEntityDescription *entityCellSave=
[NSEntityDescription entityForName:@"CellSave" inManagedObjectContext:self.managedObjectContext];
[fetchRequestCellSave setEntity:entityCellSave];

// Create the sort descriptors array.
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"nameCellData" ascending:YES];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil];
[fetchRequestCellSave setSortDescriptors:sortDescriptors];

_fetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequestCellSave managedObjectContext:self.managedObjectContext sectionNameKeyPath:@"nameCellData" cacheName:nil];
_fetchedResultsController.delegate = self;
self.fetchedResultsController = _fetchedResultsController;

return _fetchedResultsController;


}

现在，如果我想退出主tableview并转到另一个tableview，我明白我必须在我的managedObject中保存文本字段的内容，所以：

- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];

    cellSelected.amountData = cell.amount.text;

    //i have more textfields to assign but for the example i think you understand
      what i want.

    [self.managedObjectContext save:nil];

}

从这里开始，“保存”一行，数量中的文本也是......但是当我再添加一行时问题就开始了：

• 为什么新行显示在tableview的顶部，而不是在插入上一行之后？

• 当我填写插入的第二行的textField（金额）时...退出tableview并返回...文本字段没有显示填充..我做错了什么？

• 如果我一次插入2行，则会发生上一个问题，但如果我插入一个...退出tableview然后返回并插入另一行...文本字段数量已保存...

我的问题在哪里？它是我的自定义单元类吗？在哪里？...我很抱歉长篇文章，但这让我发疯...

谢谢你的时间

问候