Creating Decode Path from JSON Data in Swift that Includes Numbers and Hyphens?

问题

this is relatively new to me and I've searched high and low but have been unsuccessful in finding a similar scenario.

I have retrieved some JSON Data from an API URL and have successfully decoded and output various values from this data as strings by parsing the data to a separate sheet and using structs and constants with the 'Decodable' value set. The problem I have is that one of the containers in the Json data is a hyphenated date in this format dates['2020-11-04'] so swift will not let me create a struct with this name (also this looks like an array but there are no square brackets when viewing the unformatted JSON data in a web browser).

Here is the full path to the date I want to output as a string and the URL being used (copied from a web browser using JSON Viewer Pro):

dates['2020-11-04'].countries.Afghanistan.date

https://api.covid19tracking.narrativa.com/api/2020-11-04

Here is the sheet containing my Structs and constants to decode the data:

import Foundation

//I understand the below name will not work but i've included it to show my presumed process
struct CovidData: Decodable {
    let dates: dates[2020-11-04]
}

//Once again the below struct name does not work but i've included it as an example of my presumed process.
struct dates[2020-11-04]: Decodable {
    let countries: countries
}

struct countries: Decodable {
    let Afghanistan: Afghanistan
}
struct Afghanistan: Decodable {
    let date: String
}

Here is my management sheet with my API call and JSON Parse:

import Foundation

protocol CovidDataManagerDelegate {
    func didUpdateCovidData(_ covidDataManager: CovidDataManager, covid: CovidModel)
}

struct CovidDataManager {
    
    var delegate: CovidDataManagerDelegate?
    
    let covidURL = "https://api.covid19tracking.narrativa.com/api/2020-11-04"
    
    func getData() {
        let urlString  = covidURL
        performRequest(with:urlString)
        
    }
    
    func performRequest(with urlString: String){
        
        if let url = URL(string: urlString){
            
            let session = URLSession(configuration: .default)
            
            let task = session.dataTask(with: url) { (data, response, error) in
                if error != nil {
                    print("Error")
                    return
                }
                if let safeData = data {
                    if let covid = parseJSON(safeData){
                    self.delegate?.didUpdateCovidData(self, covid: covid)
                    }
                }
            }
            task.resume()
        }
        
        func parseJSON(_ covidData: Data) -> CovidModel?  {
            let decoder = JSONDecoder()
            do {
                let decodedData = try decoder.decode(CovidData.self, from: covidData)
                let date = decodedData.dates['2020-11-04'].countries.Afghanistan.date
                let covid = CovidModel(date: date)
                print(date)
                return covid
            } catch {
                print("Error with JSON Parse")
                return nil
            }
        }
    }

}

I have not included my UI update sheet as mentioned before the call and decode is working perfectly fine when decoding data with a JSON path made up entirely of strings it is only this container with additional symbols and numbers I am stumped with.

Hopefully I've supplied enough information and apologies if some of the terminology isn't accurate, this is still quite new to me.

Thanks!

来源：https://stackoverflow.com/questions/64714888/creating-decode-path-from-json-data-in-swift-that-includes-numbers-and-hyphens

标签

json

swift

struct

decode

let