Question

I have an array that gets created from JSON. The array looks like this:

[
    {
        "img": "images/photo_10.jpg", 
        "title": "None", 
        "photo_comments": [
            {
                "body": "my comment", 
                "author": "john", 
                "created": "2011-04-17 14:21:11"
            }
        ], 
        "id": 24
    }, 
    {
        "img": "images/photo_8.jpg", 
        "title": "None", 
        "photo_comments": [], 
        "id": 22
    }


]

我通过这个阵列,履行一个职责,列举字典,并形成一个插图,然后增加评论阵列。我的法典认为:

    -(NSArray *)formatCommentArray:(NSArray *)array  
{

    NSMutableArray *comments = [[[NSMutableArray alloc] init] autorelease];

    for (NSDictionary *photo in array)
    {   


           for( NSDictionary *comment in [photo objectForKey:@"photo_comments"])
           {

               NSString *commentString = [NSString stringWithFormat:@"%@: %@", 
                                           [comment objectForKey:@"author"], [comment objectForKey:@"body"]];



               [comments addObject:commentString];


           }




    return comments;

}

照片似乎坠毁,因为并非所有照片都有评论,而且当它进入空洞时,它就会停止。我尝试了一些“如果说的话”和其他几个骗子,没有结果。我成功地利用了该守则制造了一系列图像,但显然,“img”钥匙的价值在于NOT是一个有字典的阵列。任何帮助都将受到高度赞赏。提前感谢。

Answer 1

well, [[comment objectForKey:@"photo_comments"] objectForKey:@"author"] is trying to use objectForKey on an array, which won t work. Looking at your json, photo_comments is a (potentially empty) list, containing objects. You need one more list loop in there.

for (NSDictionary *photo in array)
{
  // do stuff with photo.img, photo.title etc

  for (NSDictionary *comment in [photo objectForKey:@"photo_comments"])
  {
    // do stuff with comment.author, comment.body etc
  }
}

(另类错误核对。)

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