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社区首页 >问答首页 >从SwiftUI接口解码JSON文件

问从SwiftUI接口解码JSON文件
EN

Stack Overflow用户
提问于 2020-03-16 16:27:41
回答 1查看 2.3K关注 0票数 0

我正在尝试解码URL中的一些JSON数据，并将其显示在列表中。我尝试过不同的方法，但都没有成功(有时它会返回未知的错误，或者只是不显示数据)这应该是表示JSON格式的结构

代码语言：javascript
复制
import SwiftUI

struct Country : Decodable {
    var thailand : [Case]
}

struct Case : Decodable  {
    var date : String
    var confirmed : Int
    var deaths : Int
    var recovered : Int
}

JSON的一小部分(但都是一样的)：

代码语言：javascript
复制
{
  "Thailand": [
    {
      "date": "2020-1-22",
      "confirmed": 2,
      "deaths": 0,
      "recovered": 0
    },
    {
      "date": "2020-1-23",
      "confirmed": 3,
      "deaths": 0,
      "recovered": 0
    },
    {
      "date": "2020-1-24",
      "confirmed": 5,
      "deaths": 0,
      "recovered": 0
    },
    {
      "date": "2020-1-25",
      "confirmed": 7,
      "deaths": 0,
      "recovered": 0
    },
    {
      "date": "2020-1-26",
      "confirmed": 8,
      "deaths": 0,
      "recovered": 2
    },
    {
      "date": "2020-1-27",
      "confirmed": 8,
      "deaths": 0,
      "recovered": 2
    },
    {
      "date": "2020-1-28",
      "confirmed": 14,
      "deaths": 0,
      "recovered": 5
    },
    {
      "date": "2020-1-29",
      "confirmed": 14,
      "deaths": 0,
      "recovered": 5
    },
    {
      "date": "2020-1-30",
      "confirmed": 14,
      "deaths": 0,
      "recovered": 5
    },
    {
      "date": "2020-1-31",
      "confirmed": 19,
      "deaths": 0,
      "recovered": 5
    },
    {
      "date": "2020-2-1",
      "confirmed": 19,
      "deaths": 0,
      "recovered": 5
    },
    {
      "date": "2020-2-2",
      "confirmed": 19,
      "deaths": 0,
      "recovered": 5
    },
    {
      "date": "2020-2-3",
      "confirmed": 19,
      "deaths": 0,
      "recovered": 5
    },
    {
      "date": "2020-2-4",
      "confirmed": 25,
      "deaths": 0,
      "recovered": 5
    },
    {
      "date": "2020-2-5",
      "confirmed": 25,
      "deaths": 0,
      "recovered": 5
    },
    {
      "date": "2020-2-6",
      "confirmed": 25,
      "deaths": 0,
      "recovered": 5
    },
    {
      "date": "2020-2-7",
      "confirmed": 25,
      "deaths": 0,
      "recovered": 5
    },
    {
      "date": "2020-2-8",
      "confirmed": 32,
      "deaths": 0,
      "recovered": 10
    },
    {
      "date": "2020-2-9",
      "confirmed": 32,
      "deaths": 0,
      "recovered": 10
    },
    {
      "date": "2020-2-10",
      "confirmed": 32,
      "deaths": 0,
      "recovered": 10
    },
    {
      "date": "2020-2-11",
      "confirmed": 33,
      "deaths": 0,
      "recovered": 10
    },
    {
      "date": "2020-2-12",
      "confirmed": 33,
      "deaths": 0,
      "recovered": 10
    },
    {
      "date": "2020-2-13",
      "confirmed": 33,
      "deaths": 0,
      "recovered": 12
    },
    {
      "date": "2020-2-14",
      "confirmed": 33,
      "deaths": 0,
      "recovered": 12
    },
    {
      "date": "2020-2-15",
      "confirmed": 33,
      "deaths": 0,
      "recovered": 12
    },
    {
      "date": "2020-2-16",
      "confirmed": 34,
      "deaths": 0,
      "recovered": 14
    },
    {
      "date": "2020-2-17",
      "confirmed": 35,
      "deaths": 0,
      "recovered": 15
    },
    {
      "date": "2020-2-18",
      "confirmed": 35,
      "deaths": 0,
      "recovered": 15
    },
    {
      "date": "2020-2-19",
      "confirmed": 35,
      "deaths": 0,
      "recovered": 15
    },
    {
      "date": "2020-2-20",
      "confirmed": 35,
      "deaths": 0,
      "recovered": 15
    },
    {
      "date": "2020-2-21",
      "confirmed": 35,
      "deaths": 0,
      "recovered": 17
    },
    {
      "date": "2020-2-22",
      "confirmed": 35,
      "deaths": 0,
      "recovered": 17
    },
    {
      "date": "2020-2-23",
      "confirmed": 35,
      "deaths": 0,
      "recovered": 21
    },
    {
      "date": "2020-2-24",
      "confirmed": 35,
      "deaths": 0,
      "recovered": 21
    },
    {
      "date": "2020-2-25",
      "confirmed": 37,
      "deaths": 0,
      "recovered": 22
    },
    {
      "date": "2020-2-26",
      "confirmed": 40,
      "deaths": 0,
      "recovered": 22
    },
    {
      "date": "2020-2-27",
      "confirmed": 40,
      "deaths": 0,
      "recovered": 22
    },
    {
      "date": "2020-2-28",
      "confirmed": 41,
      "deaths": 0,
      "recovered": 28
    },
    {
      "date": "2020-2-29",
      "confirmed": 42,
      "deaths": 0,
      "recovered": 28
    },
    {
      "date": "2020-3-1",
      "confirmed": 42,
      "deaths": 1,
      "recovered": 28
    },
    {
      "date": "2020-3-2",
      "confirmed": 43,
      "deaths": 1,
      "recovered": 31
    },
    {
      "date": "2020-3-3",
      "confirmed": 43,
      "deaths": 1,
      "recovered": 31
    },
    {
      "date": "2020-3-4",
      "confirmed": 43,
      "deaths": 1,
      "recovered": 31
    },
    {
      "date": "2020-3-5",
      "confirmed": 47,
      "deaths": 1,
      "recovered": 31
    },
    {
      "date": "2020-3-6",
      "confirmed": 48,
      "deaths": 1,
      "recovered": 31
    },
    {
      "date": "2020-3-7",
      "confirmed": 50,
      "deaths": 1,
      "recovered": 31
    },
    {
      "date": "2020-3-8",
      "confirmed": 50,
      "deaths": 1,
      "recovered": 31
    },
    {
      "date": "2020-3-9",
      "confirmed": 50,
      "deaths": 1,
      "recovered": 31
    },
    {
      "date": "2020-3-10",
      "confirmed": 53,
      "deaths": 1,
      "recovered": 33
    },
    {
      "date": "2020-3-11",
      "confirmed": 59,
      "deaths": 1,
      "recovered": 34
    },
    {
      "date": "2020-3-12",
      "confirmed": 70,
      "deaths": 1,
      "recovered": 34
    },
    {
      "date": "2020-3-13",
      "confirmed": 75,
      "deaths": 1,
      "recovered": 35
    },
    {
      "date": "2020-3-14",
      "confirmed": 82,
      "deaths": 1,
      "recovered": 35
    },
    {
      "date": "2020-3-15",
      "confirmed": 114,
      "deaths": 1,
      "recovered": 35
    }
  ],
  "Japan": [
    {
      "date": "2020-1-22",
      "confirmed": 2,
      "deaths": 0,
      "recovered": 0
    },
    {
      "date": "2020-1-23",
      "confirmed": 1,
      "deaths": 0,
      "recovered": 0
    },
    {
      "date": "2020-1-24",
      "confirmed": 2,
      "deaths": 0,
      "recovered": 0
    },
    {
      "date": "2020-1-25",
      "confirmed": 2,
      "deaths": 0,
      "recovered": 0
    },
    {
      "date": "2020-1-26",
      "confirmed": 4,
      "deaths": 0,
      "recovered": 1
    },
    {
      "date": "2020-1-27",
      "confirmed": 4,
      "deaths": 0,
      "recovered": 1
    },
    {
      "date": "2020-1-28",
      "confirmed": 7,
      "deaths": 0,
      "recovered": 1
    },
    {
      "date": "2020-1-29",
      "confirmed": 7,
      "deaths": 0,
      "recovered": 1
    },
    {
      "date": "2020-1-30",
      "confirmed": 11,
      "deaths": 0,
      "recovered": 1
    },
    {
      "date": "2020-1-31",
      "confirmed": 15,
      "deaths": 0,
      "recovered": 1
    },
    {
      "date": "2020-2-1",
      "confirmed": 20,
      "deaths": 0,
      "recovered": 1
    },
    {
      "date": "2020-2-2",
      "confirmed": 20,
      "deaths": 0,
      "recovered": 1
    },
    {
      "date": "2020-2-3",
      "confirmed": 20,
      "deaths": 0,
      "recovered": 1
    },
    {
      "date": "2020-2-4",
      "confirmed": 22,
      "deaths": 0,
      "recovered": 1
    },
    {
      "date": "2020-2-5",
      "confirmed": 22,
      "deaths": 0,
      "recovered": 1
    },
    {
      "date": "2020-2-6",
      "confirmed": 45,
      "deaths": 0,
      "recovered": 1
    },
    {
      "date": "2020-2-7",
      "confirmed": 25,
      "deaths": 0,
      "recovered": 1
    },
    {
      "date": "2020-2-8",
      "confirmed": 25,
      "deaths": 0,
      "recovered": 1
    },
    {
      "date": "2020-2-9",
      "confirmed": 26,
      "deaths": 0,
      "recovered": 1
    },
    {
      "date": "2020-2-10",
      "confirmed": 26,
      "deaths": 0,
      "recovered": 4
    },
    {
      "date": "2020-2-11",
      "confirmed": 26,
      "deaths": 0,
      "recovered": 9
    },
    {
      "date": "2020-2-12",
      "confirmed": 28,
      "deaths": 0,
      "recovered": 9
    },
    {
      "date": "2020-2-13",
      "confirmed": 28,
      "deaths": 1,
      "recovered": 9
    },
    {
      "date": "2020-2-14",
      "confirmed": 29,
      "deaths": 1,
      "recovered": 9
    },
    {
      "date": "2020-2-15",
      "confirmed": 43,
      "deaths": 1,
      "recovered": 12
    },
    {
      "date": "2020-2-16",
      "confirmed": 59,
      "deaths": 1,
      "recovered": 12
    },
    {
      "date": "2020-2-17",
      "confirmed": 66,
      "deaths": 1,
      "recovered": 12
    },
    {
      "date": "2020-2-18",
      "confirmed": 74,
      "deaths": 1,
      "recovered": 13
    },
    {
      "date": "2020-2-19",
      "confirmed": 84,
      "deaths": 1,
      "recovered": 18
    },
    {
      "date": "2020-2-20",
      "confirmed": 94,
      "deaths": 1,
      "recovered": 18
    },
    {
      "date": "2020-2-21",
      "confirmed": 105,
      "deaths": 1,
      "recovered": 22
    },
    {
      "date": "2020-2-22",
      "confirmed": 122,
      "deaths": 1,
      "recovered": 22
    },
    {
      "date": "2020-2-23",
      "confirmed": 147,
      "deaths": 1,
      "recovered": 22
    },
    {
      "date": "2020-2-24",
      "confirmed": 159,
      "deaths": 1,
      "recovered": 22
    },
    {
      "date": "2020-2-25",
      "confirmed": 170,
      "deaths": 1,
      "recovered": 22
    },
    {
      "date": "2020-2-26",
      "confirmed": 189,
      "deaths": 2,
      "recovered": 22
    },
    {
      "date": "2020-2-27",
      "confirmed": 214,
      "deaths": 4,
      "recovered": 22
    },
    {
      "date": "2020-2-28",
      "confirmed": 228,
      "deaths": 4,
      "recovered": 22
    },
    {
      "date": "2020-2-29",
      "confirmed": 241,
      "deaths": 5,
      "recovered": 32
    },
    {
      "date": "2020-3-1",
      "confirmed": 256,
      "deaths": 6,
      "recovered": 32
    },
    {
      "date": "2020-3-2",
      "confirmed": 274,
      "deaths": 6,
      "recovered": 32
    },
    {
      "date": "2020-3-3",
      "confirmed": 293,
      "deaths": 6,
      "recovered": 43
    },
    {
      "date": "2020-3-4",
      "confirmed": 331,
      "deaths": 6,
      "recovered": 43
    },
    {
      "date": "2020-3-5",
      "confirmed": 360,
      "deaths": 6,
      "recovered": 43
    },
    {
      "date": "2020-3-6",
      "confirmed": 420,
      "deaths": 6,
      "recovered": 46
    },
    {
      "date": "2020-3-7",
      "confirmed": 461,
      "deaths": 6,
      "recovered": 76
    },
    {
      "date": "2020-3-8",
      "confirmed": 502,
      "deaths": 6,
      "recovered": 76
    },
    {
      "date": "2020-3-9",
      "confirmed": 511,
      "deaths": 10,
      "recovered": 76
    },
    {
      "date": "2020-3-10",
      "confirmed": 581,
      "deaths": 10,
      "recovered": 101
    },
    {
      "date": "2020-3-11",
      "confirmed": 639,
      "deaths": 15,
      "recovered": 118
    },
    {
      "date": "2020-3-12",
      "confirmed": 639,
      "deaths": 16,
      "recovered": 118
    },
    {
      "date": "2020-3-13",
      "confirmed": 701,
      "deaths": 19,
      "recovered": 118
    },
    {
      "date": "2020-3-14",
      "confirmed": 773,
      "deaths": 22,
      "recovered": 118
    },
    {
      "date": "2020-3-15",
      "confirmed": 839,
      "deaths": 22,
      "recovered": 118
    }
  ]}

在这里，我尝试对JSON进行解码并将其插入到动态列表中

代码语言：javascript
复制
import SwiftUI

struct ContentView: View {

    @State private var cases = [Case]()

    var body: some View {
        List(cases , id: \.date) { i in
            VStack{
                Text(i.date)
                Text("\(i.deaths)")
                Text("\(i.confirmed)")
                Text("\(i.recovered)")

            }.onAppear(perform: self.loadData)

    }

}
    func loadData() {
        guard let url = URL(string: "https://pomber.github.io/covid19/timeseries.json") else {
            print("Invalid URL")
            return
        }
        let request = URLRequest(url: url)
        URLSession.shared.dataTask(with: request) { data, response, error in

            if let data = data {
                if let decodedResponse = try? JSONDecoder().decode(Country.self, from: data) {

                    DispatchQueue.main.async {
                        print(decodedResponse)
                        self.cases = decodedResponse.thailand
                    }
                    return
                }
            }

            // if we're still here it means there was a problem
            print("Fetch failed: \(error?.localizedDescription ?? "Unknown error")")

        }.resume()

    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}
swiftui
decode
json
swift
fetch
EN

回答 1

Stack Overflow用户

发布于 2020-03-17 02:00:47

要解码您的响应，您可以使用以下方式：

代码语言：javascript
复制
typealias Country = [String: [Case]]


struct Case : Decodable  {
    var date : String
    var confirmed : Int
    var deaths : Int
    var recovered : Int
}

然后解码你的数据

代码语言：javascript
复制
decodedResponse = try? JSONDecoder().decode(Country.self, from: data)

decodedResponse会给你一个包含所有国家的字典。

对于国家中的循环，您可以为一个国家设置并获取信息

代码语言：javascript
复制
for country in decodedResponse.keys {
     let cases = decodedResponse[country]
}
票数 0
EN
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：

https://stackoverflow.com/questions/60702543

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