【Xcode/Swift】お天気APIを使ってみる

pod 'Alamofire'
pod 'SwiftyJSON', '~> 4.0'

import UIKit
import Alamofire
import SwiftyJSON

class HomeViewController: UIViewController {

    // 天気のステータス
    enum WeatherType: String {
        case clouds = "Clouds"
        case rain = "Rain"
        case snow = "Snow"
    }

    // MARK: - Properties
    @IBOutlet private weak var weatherStatusImageView: UIImageView!
    @IBOutlet private weak var maxTemperature: UILabel!
    @IBOutlet private weak var minimumTemperature: UILabel!
    @IBOutlet private weak var taikanTemperature: UILabel!
    @IBOutlet private weak var currentHumidity: UILabel!
    @IBOutlet private weak var windVelocity: UILabel!

    // MARK: - View Life Cycle
    override func viewDidLoad() {
        super.viewDidLoad()
        getWeatherData(latitude: "<#緯度#>", longitude: "<#経度#>")
    }

    // 天気のデータを取得する (緯度と経度を引数で持たせる)
    private func getWeatherData(latitude: String, longitude: String) {
        let url = "https://api.openweathermap.org/data/2.5/weather?lat=\(latitude)&lon=\(longitude)&units=metric&appid=<#APIキー#>"
        guard let weatherDetailURL = url.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed) else { return }
        AF.request(weatherDetailURL, method: .get, parameters: nil, encoding: JSONEncoding.default).responseData { [weak self] (response) in
            guard let self else { return }
            switch response.result {
            case .success:
                let json = JSON(response.data as Any)
                guard let weatherStatus = json["weather"][0]["main"].string else { return }
                guard let maxTemp = json["main"]["temp_max"].number else { return }
                guard let minTemp = json["main"]["temp_min"].number else { return }
                guard let taikanTemp = json["main"]["temp"].number else { return }
                guard let currentHumi = json["main"]["humidity"].number else { return }
                guard let windVelo = json["wind"]["speed"].number else { return }
                // 天気の状態によって表示する画像を変える
                switch WeatherType(rawValue: weatherStatus) {
                case .clouds:
                    self.weatherStatusImageView.image = UIImage(named: "cloud")
                case .rain:
                    self.weatherStatusImageView.image = UIImage(named: "rain")
                case .snow:
                    self.weatherStatusImageView.image = UIImage(named: "snow")
                default:
                    self.weatherStatusImageView.image = UIImage(named: "default")
                }
                // 天気の状態によって表示するテキストを変える
                self.maxTemperature.text = "最高気温: \(Int(truncating: maxTemp).description)℃"
                self.minimumTemperature.text = "最低気温: \(Int(truncating: minTemp).description)℃"
                self.taikanTemperature.text = "体感温度: \(Int(truncating: taikanTemp).description)℃"
                self.currentHumidity.text = "湿度: \(Int(truncating: currentHumi).description)%"
                self.windVelocity.text = "風速: \(Int(truncating: windVelo).description)m/s"

            case .failure(let error):
                print("Error: \(error)")
            }
        }
    }

}