我正在尝试从URL解码一些JSON数据并将其显示在列表中。我尝试了不同的方法，但是没有一个有效（有时它会返回未知错误或根本不显示数据）这应该是代表JSON格式的结构
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（但都相同）：
{
"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
}
]}
这里我尝试解码JSON并将其插入动态列表中
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()
}
}
为了解码您的回复，您可以使用这种方式：
typealias Country = [String: [Case]]
struct Case : Decodable {
var date : String
var confirmed : Int
var deaths : Int
var recovered : Int
}
然后解码您的数据
decodedResponse = try? JSONDecoder().decode(Country.self, from: data)
decodedResponse为您提供了一个包含所有国家的地区。
用于国家/地区循环，您可以为一个国家/地区设置并获取信息
for country in decodedResponse.keys {
let cases = decodedResponse[country]
}