在swift中转换对象时出现类型不匹配错误

如何在转换city_id中的对象时将字符串转换为Int

从api接收数据并转换为对象时出错

如何在转换city_id中的对象时将字符串转换为Int

转换对象的代码

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编辑：是的，您不应该在生产代码中强制展开值-前面的代码只是为了演示。无论如何，我编辑了关于上面@Joakim Danielson评论的代码

您应该实现一个自定义initfrom decoder:decoder throws方法

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实现您自己的initfrom decoder:decoder或将属性声明为String@JoakimDanielson谢谢你的评论，你有任何例子吗？下面的答案是一个例子，但跳过可怕的！试过之后。请注意，如果按此方法执行，则需要处理每个属性，因此更简单的解决方案是在结构中将属性声明为字符串。有没有办法检查cityID是string还是Int？我编辑了代码以处理optionals并更优雅地失败。

typeMismatch(Swift.Int, Swift.DecodingError.Context(codingPath: [CodingKeys(stringValue: "city_id", intValue: nil)], debugDescription: "Expected to decode Int but found a string/data instead.", underlyingError: nil))

class ObjUserInfo: Codable {
    var id: Int
    var firstName, lastName, email: String
    var cityID: Int
    var city, country: String
    var countryID: Int
    var countryFlag: String
    var phone, birthDate: String
    var gender: Int
    var genderText: String
    var profileImage, coverImage: String
    var profileInfo: String
    var accessInfo: AccessInfo
    var userFavouriteSports: [ObjSportsList]
    var languages: String

enum CodingKeys: String, CodingKey {
    case id
    case firstName = "first_name"
    case lastName = "last_name"
    case email
    case cityID = "city_id"
    case city, country
    case countryID = "country_id"
    case countryFlag = "country_flag"
    case phone
    case birthDate = "birth_date"
    case gender
    case genderText = "gender_text"
    case profileImage = "profile_image"
    case coverImage = "cover_image"
    case profileInfo = "profile_info"
    case accessInfo = "access_info"
    case userFavouriteSports = "user_favourite_sports"
    case languages
}

init(id: Int, firstName: String, lastName: String, email: String, cityID: Int, city: String, country: String, countryID: Int, countryFlag: String, phone: String, birthDate: String, gender: Int, genderText: String, profileImage: String, coverImage: String, profileInfo: String, accessInfo: AccessInfo, userFavouriteSports: [ObjSportsList], languages: String) {
    self.id = id
    self.firstName = firstName
    self.lastName = lastName
    self.email = email
    self.cityID = cityID
    self.city = city
    self.country = country
    self.countryID = countryID
    self.countryFlag = countryFlag
    self.phone = phone
    self.birthDate = birthDate
    self.gender = gender
    self.genderText = genderText
    self.profileImage = profileImage
    self.coverImage = coverImage
    self.profileInfo = profileInfo
    self.accessInfo = accessInfo
    self.userFavouriteSports = userFavouriteSports
    self.languages = languages
}
}

let decoderdec = JSONDecoder()
//decoderdec.keyDecodingStrategy = .convertFromSnakeCase

// 2. Create Data from Response
let jsonData = try JSONSerialization.data(withJSONObject: jsonResponse["data"] as Any)

let objUser = try decoderdec.decode(ObjUserInfo.self, from: jsonData)

init(from decoder: Decoder) throws {
  let values = try decoder.container(keyedBy: CodingKeys.self)

  // Left hand side `id` is for the property, and `forKey: .id` is the case in 
  // your enum CodingKeys
  id = try values.decode(Int.self, forKey: .id)
  ...
  // First try decoding from String, and covert it to Int.
  // If it wasn't String, try decoding from Int.
  if let rawCityID = try? values.decode(String.self, forKey: .cityID),
     let cityID = Int(rawCityID) {
    self.cityID = cityID
  } else {
    cityID = try values.decode(Int.self, forKey: .cityID)
  }
  ...
}