iphone - 循环遍历 NSDictionary 以创建单独的 NSArrays

Question

我有一个很大的 NSDictionary，我需要遍历它并创建单独的 NSArray。以下是内容:

(
        {
        id =         {
            text = "";
        };
        sub =         {
            text = " , ";
        };
        text = "";
        "thumb_url" =         {
            text = "";
        };
        title =         {
            text = "2010-2011";
        };
        type =         {
            text = "title";
        };
    },
        {
        id =         {
            text = "76773";
        };
        sub =         {
            text = "December 13, 2010";
        };
        text = "";
        "thumb_url" =         {
            text = "http://www.puc.edu/__data/assets/image/0004/76774/varieties/thumb.jpg";
        };
        title =         {
            text = "College Days - Fall 2010";
        };
        type =         {
            text = "gallery";
        };
    },
        {
        id =         {
            text = "";
        };
        sub =         {
            text = "";
        };
        text = "";
        "thumb_url" =         {
            text = "";
        };
        title =         {
            text = "2009-2010";
        };
        type =         {
            text = "title";
        };
    },
        {
        id =         {
            text = "76302";
        };
        sub =         {
            text = "December 3, 2010";
        };
        text = "";
        "thumb_url" =         {
            text = "http://www.puc.edu/__data/assets/image/0019/76303/varieties/thumb.jpg";
        };
        title =         {
            text = "Christmas Colloquy";
        };
        type =         {
            text = "gallery";
        };
    }
)

每个部分都有一个类型键，我需要检查一下。当它找到 title 键时，我需要将它们添加到数组中。然后将使用 gallery 键的下一部分需要在它自己的数组中，直到它找到另一个 title 键。然后将 gallery 键放入自己的数组中。

我正在使用 UITableView 部分标题和内容。因此，上面的 NSDictionary 应该有一个 NSArray *titles; 数组，以及另外两个数组，每个数组都包含标题后面的画廊。

我尝试过使用 for 循环，但我似乎无法正确使用它。任何想法将不胜感激。

Answer 1

您的日志有些不清楚，但我猜您的 NSDictionary 的值为 NSDictionary？如果是这样:

NSMutableArray *titles = [NSMutableArray array];
// etc.

for (id key in sourceDictionary) {
  NSDictionary *subDictionary = [sourceDictionary objectForKey:key];
  if ([subDictionary objectForKey:@"type"] == @"title")
    [titles addObject:[subDictionary objectForKey:@"title"]];
  // etc.
}

您的问题有点不清楚...但这是您正确循环遍历 NSDictionary 的方式。

编辑:

NSMutableDictionary *galleries = [NSMutableDictionary dictionary];
NSString *currentTitle;

for (id key in sourceDictionary) {
  NSDictionary *subDictionary = [sourceDictionary objectForKey:key];
  NSString *type = [subDictionary objectForKey:@"type"];
  if (type == @"title") {
    currentTitle = [subDictionary objectForKey:@"title"];
    if ([galleries objectForKey:currentTitle] == nil)
      [galleries setObject:[NSMutableArray array] forKey:currentTitle];
  } else if (type == @"gallery" && currentTitle != nil)
    [[galleries objectForKey:currentTitle] addObject:subDictionary];
}

在此循环之后，galleries 将包含 NSString 类型的键(带有标题的值)，以及对应的 NSArray 类型的对象(具有库 NSDictionarys 的值)。希望这就是您想要的。