[英]Swift Codable JSON parse error with JSONDecoder
我正在嘗試使用 Codable 處理 JSON,但是當我使用 JSONDecoder().decode 對其進行解碼時出現解析錯誤。
{
"data": [
{
"id": "90",
"symbol": "BTC",
"name": "Bitcoin",
"nameid": "bitcoin",
"rank": 1,
"price_usd": "50513.75",
"percent_change_24h": "3.03",
"percent_change_1h": "-0.50",
"percent_change_7d": "-9.91",
"price_btc": "1.00",
"market_cap_usd": "942710364520.73",
"volume24": 70745042591.75044,
"volume24a": 107034995571.4168,
"csupply": "18662452.00",
"tsupply": "18662452",
"msupply": "21000000"
},
{
"id": "80",
"symbol": "ETH",
"name": "Ethereum",
"nameid": "ethereum",
"rank": 2,
"price_usd": "4052.44",
"percent_change_24h": "10.17",
"percent_change_1h": "-0.78",
"percent_change_7d": "17.75",
"price_btc": "0.084812",
"market_cap_usd": "466734637594.73",
"volume24": 53134000887.50444,
"volume24a": 87082811090.79503,
"csupply": "115173595.00",
"tsupply": "115173595",
"msupply": ""
}
],
"info": {
"coins_num": 5949,
"time": 1621022046
}
}
json 就像上面一樣,我對所有模型都進行了如下編碼。
class CoinModel: Codable {
var data: [Coin]?
var info: CoinInfo?
enum CodingKeys: String, CodingKey {
case data
case info
}
}
class CoinInfo: Codable {
var coinsNum: Int?
var time: TimeInterval?
enum CodingKeys: String, CodingKey {
case coinsNum = "coins_num"
case time = "time"
}
}
class Coin: Codable{
var csupply: String?
var id: String?
var marketCapUsd: String?
var msupply: Int?
var name: String?
var nameid: String?
var percentChange1h: String?
var percentChange24h: String?
var percentChange7d: String?
var priceBtc: String?
var priceUsd: String?
var rank: Int?
var symbol: String?
var tsupply: Int?
var volume24: Double?
var volume24a: Double?
enum CodingKeys: String, CodingKey {
case csupply = "csupply"
case id = "id"
case marketCapUsd = "market_cap_usd"
case msupply = "msupply"
case name = "name"
case nameid = "nameid"
case percentChange1h = "percent_change_1h"
case percentChange24h = "percent_change_24h"
case percentChange7d = "percent_change_7d"
case priceBtc = "price_btc"
case priceUsd = "price_usd"
case rank = "rank"
case symbol = "symbol"
case tsupply = "tsupply"
case volume24 = "volume24"
case volume24a = "volume24a"
}
}
我的網絡 function 工作如下。
URLSession.shared.dataTask(with: url) { (data, response, error) in
guard error == nil else {
completion(.failure(error!))
return
}
guard let data = data else {
completion(.failure(error ?? NSError()))
return
}
let json = try? JSONSerialization.jsonObject(with: data, options: .allowFragments) as! [String: Any]
guard let model = try? JSONDecoder().decode(CoinModel.self, from: data) else {
completion(.success([]))
return
}
completion(.success(model.data ?? []))
}.resume()
正如我之前所說,json object 不是零,我得到如下所示。
[({
csupply = "435032301.00";
id = 33285;
"market_cap_usd" = "435337535.24";
msupply = "";
name = "USD Coin";
nameid = "usd-coin";
"percent_change_1h" = "0.01";
"percent_change_24h" = "0.19";
"percent_change_7d" = "0.16";
"price_btc" = "0.000023";
"price_usd" = "1.00";
rank = 100;
symbol = USDC;
tsupply = 435032301;
volume24 = "11520659193.03477";
volume24a = "13684311331.83874";
}
)
, "info": {
"coins_num" = 5952;
time = 1621160044;
}]
我可以使用 JSONSerialization 處理 JSON 但我找不到任何原因導致JSONDecoder
方式解析錯誤。 我想我沒有看到問題。 感謝您的任何建議和幫助。
編輯:
我通過對我的 Codable class 進行了一些更改來解決它,當我為id
、 csupply
等描述 model 時我犯了一個錯誤。
var csupply: String?
var msupply: String?
var tsupply: String?
您在定義 object 時有幾個錯誤。 例如,您定義了id
, msupply
是 integer 但它們是字符串。 您已經定義了volume24
和volume24a
是字符串,但它們不是。 您需要解決所有這些問題,這可能就是您無法解析它的原因。
所有錯誤定義的參數是id
, mSupply
, volume24
, volume24a
, tSupply
硬幣 object 和info
object 您還需要將time
轉換為Int
。
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