我正在使用 Urlsession 和 JSONDecoder 来获取和解码我的数据，但不知何故，Weather 结构上的某些变量在解码时返回 nil。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()
我得到了零值，正如你在这里看到的:
但是在 postman 上我可以获得非零结果
这是我从 postman 那里获得的原始 json 数据
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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。对我的错误表示歉意。
最佳答案
问题在于变量的名称，例如:
timezone_offset 应该完全一样，而不是 timezoneOffset
您可以更新枚举 CodingKeys 以避免不良命名实践。
enum CodingKeys: String, CodingKey {
case lat, lon, timezone
case timezoneOffset = "timezone_offset"
case current, minutely, hourly, daily
}}
关于swift - 当我想使用 JSONDecoder() 解码数据时，某些变量返回 nil，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/65545354/