Question

我有以下JSON文件

{
    "events": [
               {
               "date": "01/11/2017",
               "name": [
                        "Tulsi Vivah",
                        "Pradosh Vrat"
                        ],
               "photo": [
                         "photo_chaturthi",
                         "photo_ekadashi"
                         ]
               },
               {
               "date": "03/11/2017",
               "name": [
                        "Guru Nanak Jayanti"
                        ],
               "photo": [
                         "photo_chaturthi",
                         "photo_ekadashi"
                         ]
               }
               ]
}

我想解析这个并将objectArray中的元素放在下面的代码中：

struct Objects {

        var sectionName : String!
        var sectionObjects : [String]!
        var sectionImages : [String]!
    }
    var objectArray = [Objects]()

我写了以下代码来阅读文件：

if let file = Bundle.main.url(forResource: "EventsEnglish112017", withExtension: "json") {
            let data = try Data(contentsOf: file)
            let json = try JSONSerialization.jsonObject(with: data as Data, options: [])

我的问题是如何进行类型转换＆＃34; json＆＃34;阅读单个元素以填充上述objectArray。

谢谢！

Answer 1

JSON是[String:Any?]类型的字典解析它：

if let dictionary = json as? [String: Any?] {
    if let events = dictionary["events"] as? [[String: Any?]] {

    // events is an array of JSON objects, so it's an array of dictionaries
       for item in events
       {
          let date = item["date"] as? String // this is a String?
          let name = item["name"] as? [String]
          // same goes for 'photo'
        }
    }
}

现在您已检索到数据，您可以使用它来构建自定义对象。但是如果你使用一些可以为你制作它的库，或者使用Swift4

，那就更好了

Answer 2

从JSON文件中检索数据

（Swift 3）

if let path = NSBundle.mainBundle().pathForResource("myJson", ofType: "json")
{
    if let jsonData = NSData(contentsOfFile: path, options: .DataReadingMappedIfSafe, error: nil)
    {
        if let jsonResult = NSJSONSerialization.JSONObjectWithData(jsonData, options: NSJSONReadingOptions.MutableContainers, error: nil) as? [String: Any]
        {
            if let eventsInfo = jsonResult["events"] as? [Any]
            {
                // Here you will get your data in Array format.
                // for e.g
                //   print(eventsInfo[0]["date"])
                // Just pass this eventsInfo (Array) into you Object model initializer and parse with the keys there.
            }
        }
     }
}

（Swift 4）

if let path = Bundle.main.path(forResource: "myJson", ofType: "json") {
    do {
          let data = try Data(contentsOf: URL(fileURLWithPath: path), options: .mappedIfSafe)
          let jsonResult = try JSONSerialization.jsonObject(with: data, options: .mutableLeaves)
          if let jsonResult = jsonResult as? Dictionary<String, AnyObject>, let eventsInfo = jsonResult["events"] as? [Any] {
                    // Here you will get your data in Array format.
                    // for e.g
                    //   print(eventsInfo[0]["date"])
                    // Just pass this eventsInfo (Array) into you Object model initializer and parse with the keys there.
          }
      } catch {
           // handle error
      }
}

在Swift 3中检索JSON元素

2 个答案: