iOS JSON解析包含多个阵列

Question

我有一个带有多个对象的JSON数组，我不知道如何将" URL"标记作为nsarray或nsdictionary抓取，并在CollectionView中显示该图像URL。我无法更改JSON数据格式。我应该怎么做？

这是JSON响应的样子：

   {
  "error": false,
  "data": [
    {
      "albumid": 2,
      "albumtitle": "Album 2",
      "images": [
        {
          "image": "Img2.jpeg",
          "imageid": 11
        },
        {
          "image": "vr4.jpg",
          "imageid": 4
        },
        {
          "image": "3purple b-ball.jpg",
          "imageid": 3
        }
      ]
    },
    {
      "albumid": 3,
      "albumtitle": "Album 3",
      "images": [
        {
          "image": "vr2.jpg",
          "imageid": 6
        },
        {
          "image": "vr1.jpg",
          "imageid": 5
        }
      ]
    },
    {
      "albumid": 4,
      "albumtitle": "Album 4",
      "images": [
        {
          "image": "vr1.jpg",
          "imageid": 8
        }
      ]
    },
    {
      "albumid": 12,
      "albumtitle": "My Album",
      "images": [
        {
          "image": "img3.jpeg",
          "imageid": 64
        },
        {
          "image": "img4.jpeg",
          "imageid": 63
        },
        {
          "image": "img5.jpeg",
          "imageid": 62
        }
      ]
    },
    {
      "albumid": 13,
      "albumtitle": "Demo Album",
      "images": [
        {
          "image": "img6.jpeg",
          "imageid": 67
        },
        {
          "image": "img7.jpeg",
          "imageid": 66
        },
        {
          "image": "img11.jpeg",
          "imageid": 65
        }
      ]
    }
  ]
}

Answer 1

尝试这样的东西(数据是您从WebServer获得的NSDATA对象(：

NSError *jsonError = nil;
NSDictionary *jsonData = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&jsonError];
if(!jsonError){
    NSArray *dataArray = [jsonData objectForKey:@"data"];
    NSDictionary *albumDict = [dataArray objectAtIndex:0];
    NSArray *imagesArray = [albumDict objectForKey:@"images"];
    NSDictionary *imageDict = [imagesArray objectAtIndex:0];
    NSString *imageURL = [imageDict objectForKey: @"image"];
}

当然，您必须将循环用于数组元素，此示例仅在元素0中使用。其他检查是否存在等等。

Answer 2

您可以创建一个模型来保存图像ID和URL。您在主模型(相册(中添加这些图像对象的数组。在Swift中，您的模型可能看起来像这样

class Album {
    var albumId = ""
    var albumTitle = ""
    var albumImages = [AlbumImage]()
}
class AlbumImage {
    var imageId = ""
    var imageUrl = ""
}

希望这会有所帮助！

Answer 3

下载JSON文件后使用此代码。

 NSDictionary *rootDict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
 NSArray *rootArray = rootDict[@"data"];
 NSDictionary *subDict;
 NSArray *subArray;
 NSDictionary *tempDict;
 for (int i=0; i<rootArray.count; i++) {
     subDict = rootArray[i];
     subArray = subDict[@"images"];
     for (int j=0; j<subArray.count; j++) {
         tempDict = subArray[j];
         NSLog(@"%@",tempDict[@"image"]);
     }
 }

在jsonobjectserialization中 data 是nsdata对象下载了JSON文件。