我正在尝试在Swift中解析带有可编码的JSON。我之前已经成功完成此操作，但是我有一个带有一些数组的更复杂的JSON对象，遇到了麻烦。
这是我的JSON：
{
"data": [ {
"type":"player",
"id":"account.7e5b92e6612440349afcc06b7c390114",
"attributes": {
"createdAt":"2018-04-06T04:59:40Z",
"name":"bob",
"patchVersion":"",
"shardId":"pc-na",
"stats":null,
"titleId":"bluehole-pubg",
"updatedAt":"2018-04-06T04:59:40Z"
},
"relationships": {
"assets": {
"data":[]
},
"matches": {
"data": [
{"type":"match","id":"3e2a197a-1453-4569-b35b-99e337dfabc5"},
{"type":"match","id":"15f41d2f-9da2-4b95-95ca-b85e297e14b7"},
{"type":"match","id":"a42c496c-ad92-4d3e-af1f-8eaa2e200c2b"}
{"type":"match","id":"b6e33df5-4754-49da-9a0f-144842bfc306"},
{"type":"match","id":"5b357cd1-35fe-4859-a2d7-48f263120bbd"},
{"type":"match","id":"99fc5f81-c24c-4c82-ae03-cd21c94469c0"},
{"type":"match","id":"1851c88e-6fed-48e8-be84-769f20f5ee6f"},
{"type":"match","id":"e16db7ea-520f-4db0-b45d-649264ac019c"},
{"type":"match","id":"6e61a7e7-dcf5-4df5-aa88-89eca8d12507"},
{"type":"match","id":"dcbf8863-9f7c-4fc9-b87d-93fe86babbc6"},
{"type":"match","id":"0ba20fbb-1eaf-4186-bad5-5e8382558564"},
{"type":"match","id":"8b104f3b-66d5-4d0a-9992-fe053ab4a6ca"},
{"type":"match","id":"79822ea7-f204-47f8-ae6a-7efaac7e9c90"},
{"type":"match","id":"1389913c-a742-434a-80c5-1373e115e3b6"}
]
}
},
"links": {
"schema":"",
"self":"https://api.playbattlegrounds.com/shards/pc-na/players/account.7e5b92e6612440349afcc06b7c390114"
}
}],
"links": {
"self":"https://api.playbattlegrounds.com/shards/pc-na/players?filter[playerNames]=dchilds64"
},
"meta":{}
}
这是我正在使用的模型：
public struct PlayerResponse: Codable {
let data: [Player]
}
对于玩家：
public struct Player: Codable {
let type: String
let id: String
let attributes: Attributes
let relationships: Relationships
}
对于属性：
public struct Attributes: Codable {
let name: String
let patchVersion: String
let shardId: String
let titleId: String
let updatedAt: String
}
对于关系：
public struct Relationships: Codable {
let matches: Matches
}
对于比赛：
public struct Matches: Codable {
let data: [Match]
}
匹配：
public struct Match: Codable {
let type: String
let id: String
}
解码为：
let players = try decoder.decode([Player].self, from: jsonData)
我有运行我的网络请求的此功能：
func getPlayerData(for name: String, completion: ((Result<[Player]>) -> Void)?) {
var urlComponents = URLComponents()
urlComponents.scheme = "https"
urlComponents.host = "api.playbattlegrounds.com"
urlComponents.path = "/shards/\(regionShard.rawValue)/players"
let playerNameItem = URLQueryItem(name: "filter[playerNames]", value: "\(name)")
urlComponents.queryItems = [playerNameItem]
guard let url = urlComponents.url else { fatalError("Could not create URL from components") }
print(url)
var request = URLRequest(url: url)
request.httpMethod = "GET"
request.setValue("bearer \(apiKey)", forHTTPHeaderField: "Authorization")
request.setValue("application/vnd.api+json", forHTTPHeaderField: "Accept")
let config = URLSessionConfiguration.default
let session = URLSession(configuration: config)
let task = session.dataTask(with: request) { (responseData, response, responseError) in
DispatchQueue.main.async {
if let error = responseError {
completion?(.failure(error))
} else if let jsonData = responseData {
let decoder = JSONDecoder()
do {
let players = try decoder.decode([Player].self, from: jsonData)
completion?(.success(players))
} catch {
completion?(.failure(error))
}
} else {
let error = NSError(domain: "", code: 0, userInfo: [NSLocalizedDescriptionKey : "Data was not retrieved from request"]) as Error
completion?(.failure(error))
}
}
}
task.resume()
}
我面临的问题是，当我尝试运行网络请求时出现此错误：
我认为我的可编码结构有问题，但我不确定。有人可以指出正确的方向来寻找我的错误吗？
我建议您从头开始，因为JSONDecoder结构越复杂，（与任何编译器一样）的错误就越严重。让我们看看我们能走多远：
您的Match结构很不错：
public struct Match: Codable {
let type: String
let id: String
}
let decoder = JSONDecoder()
let mData = """
{"type":"match","id":"3e2a197a-1453-4569-b35b-99e337dfabc5"}
""".data(using:.utf8)!
let match = try! decoder.decode(Match.self, from:mData)
print(match)
这里没有意外的问题。简而言之，Matches您已经遇到了第一个错误，而不是意外的错误
public struct Matches: Codable {
let data: [Match]
}
let mtchsData = """
{
"data": [
{"type":"match","id":"3e2a197a-1453-4569-b35b-99e337dfabc5"},
{"type":"match","id":"15f41d2f-9da2-4b95-95ca-b85e297e14b7"},
{"type":"match","id":"a42c496c-ad92-4d3e-af1f-8eaa2e200c2b"}
{"type":"match","id":"b6e33df5-4754-49da-9a0f-144842bfc306"},
{"type":"match","id":"5b357cd1-35fe-4859-a2d7-48f263120bbd"}
]
}
""".data(using:.utf8)!
do {
let mtches = try decoder.decode(Matches.self, from:mtchsData)
print(mtches)
} catch {
print(error)
}
将显示以下错误：
"dataCorrupted(Swift.DecodingError.Context(codingPath: [],
debugDescription: "The given data was not valid JSON.",
underlyingError: Optional(Error Domain=NSCocoaErrorDomain Code=3840
"Badly formed array around character 233."
UserInfo={NSDebugDescription=Badly
formed array around character 233.})))\n"
这是一个小错误，您在的第3行上缺少逗号data Array。加上所有这些都会很好，但是如果您的服务中出现这种情况，则必须先对其进行修复。
我想您已经知道了，并且知道了逐步构建结构的方法。在顶层，你会发现你的顶层结构超出了数组Player，它实际上是一个Dictionary与"data"作为其唯一的键，可以在正确建模PlayerResponse为@AnkitJayaswal已经指出。这已经产生了两个错误，这些是我很容易发现的错误，但是正如我在继续构建测试之前所建议的那样，您将知道“较低”级别可以正确解析并且可以专注于该问题。手。
以上所有内容都可以在Playground中轻松实现，并且不需要在此过程中实际调用WebService。当然，您将必须这样做import Cocoa，但是您已经知道这一点。无论如何，它始终可以通过将问题分解为较小的部分来降低复杂性。
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