当我想用 JSONDecoder() 解码我的数据时,一些变量 returns nil

Some variables returns nil while I want to decode my data with JSONDecoder()

我正在使用 Urlsession 和 JSONDecoder 来获取和解码我的数据,但是在我解码它时,Weather 结构 returns nil 上的一些变量不知何故。它可能与utf8有关,但我不知道如何处理。

 var request = URLRequest(url: URL(string: "myurlstring")
    URLSession.shared.dataTask(with: request) {(data,resp,err) in
        guard let data = data else { return }
        do{
            let decoder = JSONDecoder()
            let weatherData = try decoder.decode(Weather.self, from: data)
            completion(weatherData,nil)
        } catch let err {
            completion(nil,err)
        }

    }.resume()

我得到的是零值,你可以在这里看到:

但是在邮递员上我可以得到非零结果

这是我从邮递员那里得到的原始 json 数据

{"lat":39.92,"lon":32.85,"timezone":"Europe/Istanbul","timezone_offset":10800,"current":{"dt":1609623860,"sunrise":1609650620,"sunset":1609684530,"temp":2.26,"feels_like":-0.99,"pressure":1026,"humidity":72,"dew_point":-2,"uvi":0,"clouds":0,"visibility":10000,"wind_speed":1.37,"wind_deg":72,"weather":[{"id":800,"main":"Clear","description":"clear sky","icon":"01n"}]},"minutely":[{"dt":1609623900,"precipitation":0},{"dt":1609623960,"precipitation":0},{"dt":1609624020,"precipitation":0},{"dt":1609624080,"precipitation":0},{"dt":1609624140,"precipitation":0},{"dt":1609624200,"precipitation":0},{"dt":1609624260,"precipitation":0},{"dt":1609624320,"precipitation":0},{"dt":1609624380,"precipitation":0},{"dt":1609624440,"precipitation":0},{"dt":1609624500,"precipitation":0},{"dt":1609624560,"precipitation":0},{"dt":1609624620,"precipitation":0},{"dt":1609624680,"precipitation":0},{"dt":1609624740,"precipitation":0},{"dt":1609624800,"precipitation":0},{"dt":1609624860,"precipitation":0},{"dt":1609624920,"precipitation":0},{"dt":1609624980,"precipitation":0},{"dt":1609625040,"precipitation":0},{"dt":1609625100,"precipitation":0},{"dt":1609625160,"precipitation":0},{"dt":1609625220,"precipitation":0},{"dt":1609625280,"precipitation":0},{"dt":1609625340,"precipitation":0},{"dt":1609625400,"precipitation":0},{"dt":1609625460,"precipitation":0},{"dt":1609625520,"precipitation":0},{"dt":1609625580,"precipitation":0},{"dt":1609625640,"precipitation":0},{"dt":1609625700,"precipitation":0},{"dt":1609625760,"precipitation":0},{"dt":1609625820,"precipitation":0},{"dt":1609625880,"precipitation":0},{"dt":1609625940,"precipitation":0},{"dt":1609626000,"precipitation":0},{"dt":1609626060,"precipitation":0},{"dt":1609626120,"precipitation":0},{"dt":1609626180,"precipitation":0},{"dt":1609626240,"precipitation":0},{"dt":1609626300,"precipitation":0},{"dt":1609626360,"precipitation":0},{"dt":1609626420,"precipitation":0},{"dt":1609626480,"precipitation":0},{"dt":1609626540,"precipitation":0},{"dt":1609626600,"precipitation":0},{"dt":1609626660,"precipitation":0},{"dt":1609626720,"precipitation":0},{"dt":1609626780,"precipitation":0},{"dt":1609626840,"precipitation":0},{"dt":1609626900,"precipitation":0},{"dt":1609626960,"precipitation":0},{"dt":1609627020,"precipitation":0},{"dt":1609627080,"precipitation":0},{"dt":1609627140,"precipitation":0},{"dt":1609627200,"precipitation":0},{"dt":1609627260,"precipitation":0},{"dt":1609627320,"precipitation":0},{"dt":1609627380,"precipitation":0},{"dt":1609627440,"precipitation":0},{"dt":1609627500,"precipitation":0}],"hourly":[{"dt":1609621200,"temp":2.26,"feels_like":-0.99,"pressure":1026,"humidity":72,"dew_point":-2,"uvi":0,"clouds":0,"visibility":10000,"wind_speed":1.37,"wind_deg":72,"weather":[{"id":800,"main":"Clear","description":"clear 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这是我的天气模型

struct Weather: Codable {
let lat, lon: Double
let timezone: String?
let timezoneOffset: Int?
let current: Current?
let minutely: [Minutely]?
let hourly: [Current]?
let daily: [Daily]?

enum CodingKeys: String, CodingKey {
    case lat, lon, timezone
    case timezoneOffset
    case current, minutely, hourly, daily
}}

struct Current: Codable {
let dt, sunrise, sunset: Int?
let temp, feelsLike: Double?
let pressure, humidity: Int?
let dewPoint, uvi: Double?
let clouds, visibility: Int?
let windSpeed: Double?
let windDeg: Int?
let weather: [WeatherElement]?
let pop: Double?
let rain: Rain?

enum CodingKeys: String, CodingKey {
    case dt, sunrise, sunset, temp
    case feelsLike
    case pressure, humidity
    case dewPoint
    case uvi, clouds, visibility
    case windSpeed
    case windDeg
    case weather, pop, rain
}}

struct Rain: Codable {
let the1H: Double?

enum CodingKeys: String, CodingKey {
    case the1H
}}

struct WeatherElement: Codable {
let id: Int?
let main, weatherDescription, icon: String?

enum CodingKeys: String, CodingKey {
    case id, main
    case weatherDescription
    case icon
}}

struct Daily: Codable {
let dt, sunrise, sunset: Int?
let temp: Temp?
let feelsLike: FeelsLike?
let pressure, humidity: Int?
let dewPoint, windSpeed: Double?
let windDeg: Int?
let weather: [WeatherElement]?
let clouds: Int?
let pop, uvi, rain: Double?

enum CodingKeys: String, CodingKey {
    case dt, sunrise, sunset, temp
    case feelsLike
    case pressure, humidity
    case dewPoint
    case windSpeed
    case windDeg
    case weather, clouds, pop, uvi, rain
}}

struct FeelsLike: Codable {
let day, night, eve, morn: Double?}

struct Temp: Codable {
let day, min, max, night: Double?
let eve, morn: Double?}

struct Minutely: Codable {
let dt, precipitation: Double?}

这是我第一次来这里。对不起我的错误。

问题是变量的名称,例如:

timezone_offset应该是完全一样的,不是timezoneOffset

您可以更新枚举 CodingKeys 以避免不良的命名习惯。

enum CodingKeys: String, CodingKey {
    case lat, lon, timezone
    case timezoneOffset = "timezone_offset"
    case current, minutely, hourly, daily
}}