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swift4 - 试图在 swift 4 中使用可编码协议在 JSON Api 中显示所有驱动程序名称

问题描述

我正在使用 F1 API 并希望在 swift 项目中显示所有驱动程序名称。我正在使用可编码协议，并且我了解如何从 JSON API 访问一个名称或属性。只是如果我想从该 JSON API 访问所有选定的属性。我尝试了无数不同的方法来实现这一目标，但收效甚微。下面是我的代码。

struct MRData: Codable {
let xmlns: String
let series: String
let url: String
let limit, offset, total: String
let standingsTable: StandingsTable

enum CodingKeys: String, CodingKey {
    case xmlns, series, url, limit, offset, total
    case standingsTable = "StandingsTable"
  }
}

struct StandingsTable: Codable {
let season: String
let standingsLists: [StandingsList]

enum CodingKeys: String, CodingKey {
    case season
    case standingsLists = "StandingsLists"
 }
}

struct StandingsList: Codable {
let season, round: String
let driverStandings: [DriverStanding]

enum CodingKeys: String, CodingKey {
    case season, round
    case driverStandings = "DriverStandings"
  }
 }

struct DriverStanding: Codable {
let position, positionText, points, wins: String
let driver: Driver
let constructors: [Constructor]

enum CodingKeys: String, CodingKey {
    case position, positionText, points, wins
    case driver = "Driver"
    case constructors = "Constructors"
  }
}

struct Constructor: Codable {
let constructorId: String
let url: String
let name: String
let nationality: String
}

struct Driver: Codable {
let driverId: String
let url: String
let givenName, familyName, dateOfBirth, nationality: String
}

class ViewController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()

    let jsonUrlString = "https://ergast.com/api/f1/1981/driverstandings.json"

    guard let url = URL(string: jsonUrlString) else { return }

    URLSession.shared.dataTask(with: url) { (data, response, err) in

        guard let data = data else { return }
        do {
            let f1Data = try JSONDecoder().decode(F1Data.self, from: data)

              let season = f1Data.mrData.standingsTable.season

   print(f1Data.mrData.standingsTable.standingsLists[0].
   driverStandings[1].driver.familyName)
          print(season)
        } catch {
            print(error)
        }


    }.resume()
}

任何帮助，将不胜感激。

标签： swift4codable

解决方案

添加一个 for 循环。

let firstDriver = f1Data.mrData.standingsTable.standingsLists[0].driverStandings
            for driver in firstDriver {
            //print(firstDriver)
                print(driver.driver.familyName)
            }

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