Parsing the Json received in Alamofire using Codable

This is a way of tapping お天気Webサービス（Livedoor Weather Web Service） ‘s API from Alamofire and parsing the returned JSON into a struct.

	import UIKit
	import Alamofire

	class Weather: Codable {
	let title: String
	let link: String
	let description: Description
	let pinpointLocations: [PinpointLocation]
	let location: Location
	let forecasts: [Forcast]
	}

	struct Description: Codable {
	let text: String
	let publicTime: String
	}

	struct PinpointLocation: Codable {
	let link: String
	let name: String
	}

	struct Location: Codable {
	let city: String
	let area: String
	let prefecture: String
	}

	struct Forcast: Codable {
	let dateLabel: String
	let telop: String
	let date: String
	let image: Image
	}

	struct Image: Codable {
	let width: Int
	let url: String
	let title: String
	let height: Int
	}


	class Alamofire_Codable_201900801: UIViewController {

	override func viewDidLoad() {
	super.viewDidLoad()

	view.backgroundColor = .white

	//お天気APIから東京の天気を取得する
	let url: String = "http://weather.livedoor.com/forecast/webservice/json/v1?city=130010"
	Alamofire.request(url, method: .get, encoding: JSONEncoding.default).responseJSON { response in
	switch response.result {
	case .success:
	guard let data = response.data else { return }
	guard let weather = try? JSONDecoder().decode(Weather.self, from: data) else {
	return
	}

	self.showWeatherAlert(weather: weather)
	case .failure(let error):
	print(error)
	}
	}
	}

	func showWeatherAlert(weather: Weather) -> Void {
	// アラートを作成
	let alert = UIAlertController(
	title: weather.title,
	message: weather.description.text,
	preferredStyle: .alert)
	alert.addAction(UIAlertAction(title: "OK", style: .default))

	present(alert, animated: true, completion: nil)
	}
	}