Question

我想解析具有以下格式的JSON：

{
"list": {
    "q": "cookie",
    "sr": "28",
    "ds": "any",
    "start": 0,
    "end": 50,
    "total": 6536,
    "group": "",
    "sort": "r",
    "item": [
        {
            "offset": 0,
            "group": "Branded Food Products Database",
            "name": "THE COOKIE DOUGH CAFE, GOURMET EDIBLE COOKIE DOUGH, COOKIES & CREAM, UPC: 850947006012",
            "ndbno": "45095905",
            "ds": "BL"
        },
        {
            "offset": 1,
            "group": "Branded Food Products Database",
            "name": "MELK AND COOKIES, COOKIE DOUGH CLUSTERS CHOCOLATE CHIP COOKIES, UPC: 094922378675",
            "ndbno": "45026487",
            "ds": "BL"
        }]
}

我想在两个类中获取数据。我在JSON文件中获得的项目和列表中的项目的一个类。

item类应该有变量offset，group，name，ndbno和ds。然后我想把所有项目都放到一个数组“items”。

类列表将包含变量q，sr，ds，start，end，total，group，sort和数组项。

我想在我定义的类结构中使用json结构。

有人知道怎么做吗？感谢。

我从网站上获取了json。我收到的请求包含以下代码：

//Send Request
    var done = false
    print("Send request")
    var requestResponse = ""
    var parsedResults: AnyObject?

    let task = URLSession.shared.dataTask(with: request) { data, response, error in
        guard let data = data, error == nil else {// check for fundamental networking error
            print("error=\(error)")
            return
        }

        if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode != 200 {// check for http errors
            print("statusCode should be 200, but is \(httpStatus.statusCode)")
        }

        let responseString = String(data: data, encoding: .utf8)
        done = true
        requestResponse = responseString!
        //print("responseString = \(responseString)")


    }
    task.resume()

    //Wait for response
    repeat {
        RunLoop.current.run(until: Date(timeIntervalSinceNow: 0.1))
    } while !done

Answer 1

在Swift 4中非常简单

let jsonString = """
{
    "list": {
        "q": "cookie",
        "sr": "28",
        "ds": "any",
        "start": 0,
        "end": 50,
        "total": 6536,
        "group": "",
        "sort": "r",
        "item": [
            {
            "offset": 0,
            "group": "Branded Food Products Database",
            "name": "THE COOKIE DOUGH CAFE, GOURMET EDIBLE COOKIE DOUGH, COOKIES & CREAM, UPC: 850947006012",
            "ndbno": "45095905",
            "ds": "BL"
            },
            {
            "offset": 1,
            "group": "Branded Food Products Database",
            "name": "MELK AND COOKIES, COOKIE DOUGH CLUSTERS CHOCOLATE CHIP COOKIES, UPC: 094922378675",
            "ndbno": "45026487",
            "ds": "BL"
            }
        ]
    }
}
"""

struct Root : Decodable {
    let list : List

    struct List : Decodable {
        let q : String
        let sr : String
        let ds : String
        let start : Int
        let end : Int
        let total : Int
        let group : String
        let sort : String
        let item : [Item] // should be `items`

        struct Item : Decodable {
            let offset : Int
            let group : String
            let name : String
            let ndbno : String
            let ds : String
        }
    }
}

let data = Data(jsonString.utf8)
do {
    let result = try JSONDecoder().decode(Root.self, from: data)
    print(result)
} catch { print(error) }

PS：正如评论中已经提到的：while循环很糟糕。使用异步完成处理程序

将Swift中的JSON解析为类的数组

1 个答案: