無法在Xcode中處理API資料并快速解碼為json

概括

我正在嘗試從 API 獲取資料并將其解碼為 json

我對以下代碼有 2 個問題

1. apiOutput 變數的輸出是否適合解碼為 json 格式，如果不是，我如何獲得正確的輸出？我在想它可能會改變選項JSONSerialization.jsonObject

2. 如何將我的apiOutput變數提供給我希望能夠將 apiOutput 解碼為正確的 json 格式的 PriceApiModel.swift。即使 PriceApiModel.swift 能夠做到這一點，我也不確定如何將 apiOutput 輸入其中

此影像是 API 回傳的資料

我在呼叫 API 資料后嘗試獲取它，請參閱下面的完整代碼

// from AppDelegate.swift full file included below
let apiOutput = try JSONSerialization.jsonObject(with: data!, options: [])
print(apiOutput) // please see output below

列印 apiOutput 的輸出

{
    askPrice = "0.07530300";
    askQty = "28.15780000";
    bidPrice = "0.07530200";
    bidQty = "20.99700000";
    closeTime = 1666814307216;
    count = 389744;
    firstId = 383543634;
    highPrice = "0.07593900";
    lastId = 383933377;
    lastPrice = "0.07530300";
    lastQty = "11.85740000";
    lowPrice = "0.07230700";
    openPrice = "0.07365100";
    openTime = 1666727907216;
    prevClosePrice = "0.07365200";
    priceChange = "0.00165200";
    priceChangePercent = "2.243";
    quoteVolume = "13084.96427533";
    symbol = ETHBTC;
    volume = "176432.41160000";
    weightedAvgPrice = "0.07416418";
}

我制作了 PriceApiModel.swift 來嘗試解碼上述輸出。但是不要相信我在 JSONSerialization 中有正確的選擇，因為輸出看起來更像變數而不是 json 檔案。

// PriceApiModel.swift
import Foundation
import SwiftUI
import CoreLocation

struct PriceApiModel: Hashable, Codable {
    var askPrice: String
    var askQty: String
    var bidPrice: String
    var bidQty: String
    var closeTime: Int
    var count: Int
    var firstId: Int
    var highPrice: String
    var lastId: Int
    var lastPrice: String
    var lastQty: String
    var lowPrice: String
    var openPrice: String
    var openTime: Int
    var prevClosePrice: String
    var priceChange: String
    var priceChangePercent: String
    var quoteVolume: String
    var symbol: String
    var volume: String
    var weightedAvgPrice: String

}

AppDelegate.swift 的完整代碼

import UIKit
    
class ViewController: UIViewController {
    
    let headers = [
        "X-RapidAPI-Key": "cannot provide this please see sample outpout",
        "X-RapidAPI-Host": "binance43.p.rapidapi.com"
    ]

    let request = NSMutableURLRequest(url: NSURL(string: "https://binance43.p.rapidapi.com/ticker/24hr?symbol=ETHBTC")! as URL,
                                            cachePolicy: .useProtocolCachePolicy,
                                        timeoutInterval: 10.0)
        
    
    func getData() {
        request.httpMethod = "GET"
        request.allHTTPHeaderFields = headers
        
        let session = URLSession.shared
        let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
            if (error != nil) {
                print(error)
            } else {
                let httpResponse = response as? HTTPURLResponse
                do {
                    let apiOutput = try JSONSerialization.jsonObject(with: data!, options: [])
                        
                    
                        print(apiOutput) // this is the output I am getting
                                            
                } catch {
                    print("NOT WORKING ")
                }
            }
        })
        dataTask.resume()
    }
    
}

uj5u.com熱心網友回復：

如果您只想將接收到的資料解碼到您的模型中，您可以使用JSONDecoder.

let model = try JSONDecoder().decode(PriceApiModel.self, from: data!)

但是，如果您想在代碼中進一步使用此模型，我建議您對收到的資料使用一些有用的型別。我做了一個例子，askPrice但其他人將以類似的方式完成。

// used for throwing errors
enum CustomError: Error{
    case decodingError
}

struct PriceApiModel: Hashable, Codable {
    //changed the String type to Decimal
    var askPrice: Decimal
    var askQty: String
    var bidPrice: String
    var bidQty: String
    var closeTime: Int
    var count: Int
    var firstId: Int
    var highPrice: String
    var lastId: Int
    var lastPrice: String
    var lastQty: String
    var lowPrice: String
    var openPrice: String
    var openTime: Int
    var prevClosePrice: String
    var priceChange: String
    var priceChangePercent: String
    var quoteVolume: String
    var symbol: String
    var volume: String
    var weightedAvgPrice: String
    
    // every property you are interested to decode needs a CodingKey.
    // You can omit values you are not interested in
    enum CodingKeys: CodingKey{
        case askPrice
    }
    
    // here you decode your data into the struct
    init(from decoder: Decoder) throws {
        // get the container
        let container = try decoder.container(keyedBy: CodingKeys.self)
        // decode the askPrice into a String and cast it into a Decimal
        let askPrice = Decimal(string: try container.decode(String.self, forKey: .askPrice))
        // check if casting was succesfull else throw
        guard let askPrice = askPrice else{
            throw CustomError.decodingError
        }
        // assign it
        self.askPrice = askPrice
    }
}

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