解码JSON Swift 4-嵌套对象/数组

Question

有人能看到我缺了什么吗？我无法解码任何过去的结果。结果下不会打印任何内容。我已经查看了其他几篇与JSON/Swift相关的帖子，但仍然不明白我做错了什么。这是我的JSON:

{
"results": [
{
"user.ldap.principal": "OHWIL3336IPM101",
"common.os_version": "11.4",
"common.wifi_mac_address": "100caef1001d",
"common.status": "ACTIVE",
"common.creation_date": "2018-17-05T16:42:49.000Z",
"ios.iPhone UDID": "a8a7a2e52359353dfbacf026a4fada9ew1cb4c10",
"user.ldap.user_attributes.custom1": [
"3336"
],
"common.SerialNumber": "F9FWEF74GHMN",
"common.uuid": "01cd1ed3-b3af-48c0-8499-654c0a9ab996"
}
],
"totalCount": 1,
"resultCount": 1,
"searchTimeMillis": 1,
"currentServerTimeMilliseconds": 1531558334959,
"hasMore": false
}

这是我目前拥有的。

struct DeviceData: Codable {
let results: [Result]
let totalCount, resultCount, searchTimeMillis, currentServerTimeMilliseconds: Int
let hasMore: Bool
}
struct Result: Codable {
let commonOSVersion, commonStatus, commonImei, commonCreationDate: String?
let iosDeviceName, commonUUID, userLDAPPrincipal, commonWifiMACAddress: String?
let iosIPhoneUDID: String?
let userLDAPUserAttributesCustom1: [String]?
let commonSerialNumber: String?
let userLDAPGroupsName: [String]?
let iosIPhoneICCID: String?
enum CodingKeys: String, CodingKey {
case commonOSVersion = "common.os_version"
case commonStatus = "common.status"
case commonImei = "common.imei"
case commonCreationDate = "common.creation_date"
case iosDeviceName = "ios.DeviceName"
case commonUUID = "common.uuid"
case userLDAPPrincipal = "user.ldap.principal"
case commonWifiMACAddress = "common.wifi_mac_address"
case iosIPhoneUDID = "ios.iPhone UDID"
case userLDAPUserAttributesCustom1 = "user.ldap.user_attributes.custom1"
case commonSerialNumber = "common.SerialNumber"
case userLDAPGroupsName = "user.ldap.groups.name"
case iosIPhoneICCID = "ios.iPhone ICCID"
}
}

尝试解码：

let decoder = JSONDecoder()
guard let data = data else {return}
do {
let json = try decoder.decode(DeviceData.self, from: data)
dump(json)
print(json.commonImei) //Does not print - Does not auto-populate - Error Here
} 
catch let jsonError {
print("JSON Failed to Decode: ", jsonError)
}

错误：

Value of type 'DeviceData' has no member 'commonImei'

json将完整打印到控制台，但如果我尝试打印Result(results(中的任何字段，则值不会自动填充，并且我会收到一个错误。我是不是在解码方面遗漏了什么？

Answer 1

您需要do-catch

do {
let decoder = JSONDecoder()
let json = try decoder.decode(DeviceData.self, from: data)
dump(json)
print(json.results[0].commonImei)
}
catch {
print(error)
}

//

json表示结构DeviceData的一个对象，该对象不直接包含commonImei，但它有一个数组结果，其中它的所有元素都包含密钥