这是 Swift 4 的另一种方法 -使用 Codable
这是我收到的 json:
{
"error_code": 0,
"result": {
"responseData": "{\"emeter\":{\"get_realtime\":{\"voltage_mv\":237846,\"current_ma\":81,\"power_mw\":7428,\"total_wh\":1920,\"err_code\":0}}}"
}
}
带有反斜杠的 JSON 部分等于:
{
"emeter": {
"get_realtime": {
"voltage_mv": 237846,
"current_ma": 81,
"power_mw": 7428,
"total_wh":19201,
"err_code":0
}
}
}
这是我使用的代码:
import Foundation
class RealtimeEnergy: Codable {
let errorCode: Int
let result: ResultRealtimeEnergy?
let msg: String?
enum CodingKeys: String, CodingKey {
case errorCode = "error_code"
case result, msg
}
init(errorCode: Int, result: ResultRealtimeEnergy?, msg: String?) {
self.errorCode = errorCode
self.result = result
self.msg = msg
}
}
class ResultRealtimeEnergy: Codable {
let responseData: String
var emeter: Emeter
enum CodingKeys: String, CodingKey {
case responseData
}
required init(from decoder: Decoder) throws {
let container = try decoder.container(keyedBy: CodingKeys.self)
responseData = try container.decode(String.self, forKey: .responseData)
let dataString = try container.decode(String.self, forKey: .responseData)
emeter = try JSONDecoder().decode(Emeter.self, from: Data(dataString.utf8))
}
}
class Emeter: Codable {
let emeter: EmeterClass
init(emeter: EmeterClass) {
self.emeter = emeter
}
}
class EmeterClass: Codable {
let getRealtime: GetRealtime
enum CodingKeys: String, CodingKey {
case getRealtime = "get_realtime"
}
init(getRealtime: GetRealtime) {
self.getRealtime = getRealtime
}
}
class GetRealtime: Codable {
let voltageMv, currentMa, powerMw, totalWh: Int
let errCode: Int
enum CodingKeys: String, CodingKey {
case voltageMv = "voltage_mv"
case currentMa = "current_ma"
case powerMw = "power_mw"
case totalWh = "total_wh"
case errCode = "err_code"
}
init(voltageMv: Int, currentMa: Int, powerMw: Int, totalWh: Int, errCode: Int) {
self.voltageMv = voltageMv
self.currentMa = currentMa
self.powerMw = powerMw
self.totalWh = totalWh
self.errCode = errCode
}
}
这就是诀窍:
emeter = try JSONDecoder().decode(Emeter.self, from: Data(dataString.utf8))