如何从嵌套的NSMutableDictionary获取numberOfRowsInSection？

Question

我正在尝试关注此帖http://www.appcoda.com/ios-programming-index-list-uitableview/以使用UITableViewController创建部分。

我使用两个NSMutableDictionaries第一个（_curatedItemDictionary）字典来存储来自Parse的键值对，第二个（_sectionsDictionary）是将这些存储在字典中作为键和值存储为类别类型。

 [_sectionsDictionary setObject:[obj objectForKey:@"Category"] forKey:_curatedItemDictionary];

我这样做是因为我无法将键存储为类别和值作为字典，因为字典不支持重复键。

我使用以下代码获取numberOfSectionsInTableView

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    for(NSString *key in [_sectionsDictionary allKeys]) {
        [_cleanArray addObject:[_sectionsDictionary objectForKey:key]];
    }
    NSCountedSet *set = [[NSCountedSet alloc] initWithArray:_cleanArray];        
    for (id item in set) {           
        NSInteger count =  (unsigned long)[set countForObject:item];
        [_rowForIndexArray addObject:[NSNumber numberWithInteger:count]];
    }        
    _cleanSectionArray = [[NSSet setWithArray:_cleanArray] allObjects];
    return [_cleanSectionArray count];
}

如何从上述信息中获取numberOfRowsInSection？我如何知道特定部分正在迭代哪些项目？

以下是我用于从Parse.com数据

创建curatedItemDictionary的代码

PFQuery *query  = [PFQuery queryWithClassName:[NSString stringWithString:self.classname]];
    [query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
        if (!error) {
            // The find succeeded.

            for (PFObject *obj in objects) {

             self.curatedItemDictionary = [[NSMutableDictionary alloc]init];


             [_curatedItemDictionary setValue:[obj objectForKey:@"ItemName"] forKey:@"ItemName"];
            [_curatedItemDictionary setValue:[obj objectForKey:@"Price"] forKey:@"Price"];


            [_sectionsDictionary setObject:[obj objectForKey:@"Category"] forKey:_curatedItemDictionary];


              [self.tableView reloadData];
        } else {
            // Log details of the failure
            NSLog(@"Error: %@ %@", error, [error userInfo]);
        }
    }];