【Swift】Playground で API から JSON データを取得して デコード して画像を表示する 🐶 👉 https://android.benigumo.com/20231204/playground-api/

fetch_dog.swift

import WebKit
import PlaygroundSupport

struct Dog: Decodable {
  let message: String
  let status: String
}

enum DogError: Error {
  case missingData
  case wrongDataFormat(error: Error)
}

func get(url: String) async throws -> Data {
  let session = URLSession.shared
  guard let (data, response) = try? await session.data(from: URL(string: url)!),
        let httpResponse = response as? HTTPURLResponse,
        httpResponse.statusCode == 200
  else {
    throw DogError.missingData
  }
  return data
}

func decode<T: Decodable>(data: Data) throws -> T {
  do {
    let decoder = JSONDecoder()
    decoder.dateDecodingStrategy = .millisecondsSince1970
    return try decoder.decode(T.self, from: data)
  } catch {
    throw DogError.wrongDataFormat(error: error)
  }
}

func show(url: String) {
  let view = WKWebView(frame: CGRect(x: 0, y: 0, width: 300, height: 300))
  let request = URLRequest(url: URL(string: url)!)
  view.load(request)
  PlaygroundPage.current.liveView = view
}

Task { @MainActor in
  let url = "https://dog.ceo/api/breeds/image/random"
  let data = try await get(url: url)
  let dog = try decode(data: data) as Dog

  show(url: dog.message)
}