Question

我有一个带结构的JSON数据，我不知道如何使用SwiftyJSON for循环获取＆＃34; path＆＃34;的每个部分条目。和＆＃34;更新＆＃34;值。有人可以帮忙吗？感谢。

var jsonData = "{
      "css":[
         {
            "path": "style.css",
            "updated": "12432"
         },
         {
            "path": "base.css",
            "updated": "34627"
         },

      ],
      "html":[
         {
            "path": "home.htm",
            "updated": "3223"
         },
         {
            "path": "about",
            "updated": "3987"
         }
      ]
    }
"

我尝试编写for-loop的一部分

let json = JSON(jsonData)

for ( ) in json {
   let filepath = 
   let updated = 

   // do searching another json to found file exists and updates
}

Answer 1

它位于README上，名为＆＃34; loop＆＃34;：https://github.com/SwiftyJSON/SwiftyJSON#loop

// If json is .Dictionary
for (key,subJson):(String, JSON) in json {
   //Do something you want
}

// If json is .Array
// The `index` is 0..<json.count's string value
for (index,subJson):(String, JSON) in json {
    //Do something you want
}

应用于您的特定JSON结构：

    let jsonData = """
    {
      "css": [
        {
          "path": "style.css",
          "updated": "12432"
        },
        {
          "path": "base.css",
          "updated": "34627"
        }
      ],
      "html": [
        {
          "path": "home.htm",
          "updated": "3223"
        },
        {
          "path": "about",
          "updated": "3987"
        }
      ]
    }
    """.data(using: .utf8)!

    let json = JSON(data: jsonData)

    for (_, subJson):(String, JSON) in json {

        for (_, subJson):(String, JSON) in subJson {
            let filepath = subJson["path"].stringValue
            let updated  = subJson["updated"].stringValue

            print(filepath + " ~ " + updated)
        }
    }

使用Swift 4 Codable：

struct FileInfo: Decodable {
    let path, updated: String
}

let dec = try! JSONDecoder().decode([String:[FileInfo]].self,from: jsonData)
print(dec)

Answer 2

根据您的JSON结构，请使用：

for (index,subJson):(String, JSON) in json {
    print(index) // this prints "css" , "html"
    for (key,subJson):(String, JSON) in subJson {
        let filepath = subJson["path"]
        let updated  = subJson["updated"]
    }
}

如何在SwiftyJSON中循环遍历JSON数据

2 个答案: