是的，很容易，虽然有一百万种方法。 p>

您的视图控制器应该是 UITableView 的数据源，并返回有关行数的信息然后是每个单独行的内容。

在tableview中有一个section的概念，你可以选择为每个类别有一个。

例如，您可以创建一个 NSFetchedResultsController 来查找要显示的类别，并使用它来填充表视图部分，然后每个类别将有一个文章多对多关系，以填充每个部分的行。

这样的东西应该让你开始类别和文章实体都包含 title 属性）：

   - NSInteger）numberOfSectionsInTableView：（UITableView *）tableView 
 {
 //返回类别数量
 [[self.categoryResultsController fetchedObjects] count]; 
} 

  - （NSString *）tableView：（UITableView *）tableView titleForHeaderInSection：（NSInteger）section 
 {
 //返回单个类别的标题
 [[self.categoryResultsController.fetchedObjects objectAtIndex：section] valueForKey：@title]; 
} 

  - （NSInteger）tableView：（UITableView *）tableView numberOfRowsInSection：（NSInteger）section 
 {
 //返回类别中的文章数量
 MyCategory * category = [self.categoryResultsController.fetchedObjects objectAtIndex：section]; 

 return category.articles.count; 
} 

  - （UITableViewCell *）tableView：（UITableView *）tableView cellForRowAtIndexPath：（NSIndexPath *）indexPath 
 {
 //获取缓存单元格对象每一行是相同的，我们重复使用相同的对象反复）
 static NSString * identifier = @ArticleCellIdentifier; 
 UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier：identifier]; 
 if（cell == nil）{
 cell = [[[UITableViewCell alloc] initWithStyle：UITableViewCellStyleDefault reuseIdentifier：identifier] autorelease]; 
} 

 //查找类别和文章，并设置单元格的文本
 MyCategory * category = [self.categoryResultsController.fetchedObjects objectAtIndex：indexPath.section]; 

 cell.textLabel.text = [[category.articles objectAtIndex：indexPath.row] valueForKey：@title]; 

 return cell; 
} 
 

您可以阅读有关这些方法的文档，了解如何进一步自定义。

My Core Data model looks like this:

article <--->> category

Is it even remotely possible to use NSFetchedResultsController to produce a UITableView that looks something like this?

Category 1
  - Article A
  - Article B
  - Article C
Category 2
  - Article A
  - Article D
  - Article E
  - Article F
Category 3
  - Article B
  - Article C

Specifically, I'm interested in the (edge?) case where each UITableView section has a unique title (eg, "Category 1", "Category 2"), but the same object can exist in multiple sections (eg, Article A exists in both Category 1 and Category 2).

I have scoured Apple's Core Data docs and have spent two days perusing questions here, but alas, no luck even finding out whether this is possible, let alone how to implement it. Thanks for any help or pointers to a previously answered question. I certainly couldn't find it.

Yes, it's easy, though there are a million ways to do it.

Your view controller should be the "data source" of the UITableView, and returns information about the number of rows there are and then the contents of each individual row.

There is a concept of a "section" in a tableview, you might choose to have one for each category.

For example, you could create an NSFetchedResultsController to find the categories you want to display, and use that to populate the table view sections, and then each category would have an articles many-to-many relationship, to populate the rows in each section.

Something like this should get you started (assuming your category and article entities both contain a title property):

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
   // return the number of categories
    [[self.categoryResultsController fetchedObjects] count];
}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
  // return the title of an individual category
    [[self.categoryResultsController.fetchedObjects objectAtIndex:section] valueForKey:@"title"];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
  // return the number of articles in a category
  MyCategory *category = [self.categoryResultsController.fetchedObjects objectAtIndex:section];

  return category.articles.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
  // fetch a cached cell object (since every row is the same, we re-use the same object over and over)
    static NSString *identifier = @"ArticleCellIdentifier";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier] autorelease];
    }

    // find the category and article, and set the text of the cell
    MyCategory *category = [self.categoryResultsController.fetchedObjects objectAtIndex:indexPath.section];

    cell.textLabel.text = [[category.articles objectAtIndex:indexPath.row] valueForKey:@"title"];

    return cell;
}

You can read the documentation on these methods to figure out how to customise it further.