[英]Swift 5: Decoding Nested JSON
I'm having a little trouble decoding some JSON data into a struct.我在将一些 JSON 数据解码为结构时遇到了一些麻烦。 I've tried below methods and it doesn't work:
我尝试了以下方法,但不起作用:
JSON: JSON:
{
"submission_date": "2020-02-28T14:21:46.000+08:00",
"status": "pending",
"requestor": {
"name": "Adam"
},
"claim_items": [
{
"date": "2020-02-20",
"description": "TV",
"currency": "MYR",
"amount": "103.0",
"amount_in_ringgit": "10.0"
},
{
"date": "2020-02-20",
"description": "Netflix",
"currency": "MYR",
"amount": "12.0",
"amount_in_ringgit": "10.0"
}
]
}
Struct Method 1:结构方法一:
struct ClaimDetail: Decodable {
let submission_date: String
let status: String
let requestor: Requestor
let claim_items: [ClaimItem]
}
struct Requestor: Decodable {
let name: String
init(json: [String:Any]) {
name = json["name"] as? String ?? ""
}
}
struct ClaimItem: Decodable {
let date: String
let description: String
let currency: String
let amount: String
let amount_in_ringgit: String
init(json: [String:Any]) {
date = json["date"] as? String ?? ""
description = json["description"] as? String ?? ""
currency = json["currency"] as? String ?? ""
amount = json["amount"] as? String ?? ""
amount_in_ringgit = json["amount_in_ringgit"] as? String ?? ""
}
}
Struct Method 2:结构方法2:
struct ClaimDetail: Decodable {
let submission_date: String
let status: String
let requestor: Requestor
let claim_items: [ClaimItem]
struct Requestor: Decodable {
let name: String
init(json: [String:Any]) {
name = json["name"] as? String ?? ""
}
}
struct ClaimItem: Decodable {
let date: String
let description: String
let currency: String
let amount: String
let amount_in_ringgit: String
init(json: [String:Any]) {
date = json["date"] as? String ?? ""
description = json["description"] as? String ?? ""
currency = json["currency"] as? String ?? ""
amount = json["amount"] as? String ?? ""
amount_in_ringgit = json["amount_in_ringgit"] as? String ?? ""
}
}
}
Struct Method 3 (via https://app.quicktype.io/ ):结构方法 3(通过https://app.quicktype.io/ ):
// MARK: - ClaimDetail
struct ClaimDetail: Codable {
let submissionDate, status: String
let requestor: Requestor
let claimItems: [ClaimItem]
enum CodingKeys: String, CodingKey {
case submissionDate = "submission_date"
case status, requestor
case claimItems = "claim_items"
}
}
// MARK: - ClaimItem
struct ClaimItem: Codable {
let date, claimItemDescription, currency, amount: String
let amountInRinggit: String
enum CodingKeys: String, CodingKey {
case date
case claimItemDescription = "description"
case currency, amount
case amountInRinggit = "amount_in_ringgit"
}
}
// MARK: - Requestor
struct Requestor: Codable {
let name: String
}
URL Session网址会话
URLSession.shared.dataTask(with: requestAPI) { [weak self] (data, response, error) in
if let data = data {
do {
let json = try JSONDecoder().decode(ClaimDetail.self, from: data)
print (json)
} catch let error {
print("Localized Error: \(error.localizedDescription)")
print("Error: \(error)")
}
}
}.resume()
All returns below error:所有返回以下错误:
Localized Error: The data couldn't be read because it isn't in the correct format.
本地化错误:无法读取数据,因为它的格式不正确。
Error: dataCorrupted(Swift.DecodingError.Context(codingPath: [], debugDescription: "The given data was not valid JSON.", underlyingError: Optional(Error Domain=NSCocoaErrorDomain Code=3840 "Invalid value around character 0." UserInfo={NSDebugDescription=Invalid value around character 0.})))错误:dataCorrupted(Swift.DecodingError.Context(codingPath: [], debugDescription: “给定的数据不是有效的 JSON。”,underlyingError: Optional(Error Domain=NSCocoaErrorDomain Code=3840 “字符 0 附近的值无效。” UserInfo={ NSDebugDescription=字符 0 周围的值无效。})))
I used struct method #1 and it wasn't the issue.我使用了结构方法#1,这不是问题。 The issue was with how I decoded the data in URLSession.
问题在于我如何解码 URLSession 中的数据。 For some reason, this works:
出于某种原因,这有效:
URLSession.shared.dataTask(with: requestAPI) { [weak self] (data, response, error) in
if let data = data {
do {
let dataString = String(data: data, encoding: .utf8)
let jsondata = dataString?.data(using: .utf8)
let result = try JSONDecoder().decode(ClaimDetail.self, from: jsondata!)
print(result)
} catch let error {
print("Localized Error: \(error.localizedDescription)")
print("Error: \(error)")
}
}
}.resume()
Screenshot:截屏:
I don't really understand but I guess I had to convert the data into a string, then decode that instead?我不太明白,但我想我必须将数据转换为字符串,然后对其进行解码?
Thank you all for helping out.谢谢大家帮忙。
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