[iOSアプリ開発初期格差コース]Part 2.天候アプリケーションの作成

天気アプリ

Intro

URLセッションによるHTTP通信

Openweather API

きのうインプリメンテーション

//
//  ViewController.swift
//  Weather
//
//  Created by TAEJANIM on 2021/11/23.
//

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var cityNameTextField: UITextField!
    @IBOutlet weak var cityNameLabel: UILabel!
    @IBOutlet weak var weatherDescriptionLabel: UILabel!
    @IBOutlet weak var tempLabel: UILabel!
    @IBOutlet weak var maxTempLabel: UILabel!
    @IBOutlet weak var minTempLabel: UILabel!
    @IBOutlet weak var weatherStackView: UIStackView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func tapFetchWeatherButton(_ sender: UIButton) {
        if let cityName = self.cityNameTextField.text {
            self.getCurrentWeather(cityName: cityName)
            self.view.endEditing(true)
        }
    }
    
    func configureView(weatherInformation: WeatherInformation) {
        self.cityNameLabel.text = weatherInformation.name
        if let weather = weatherInformation.weather.first {
            self.weatherDescriptionLabel.text = weather.description
        }
        self.tempLabel.text = "\(Int(weatherInformation.temp.temp - 273.15))℃"
        self.minTempLabel.text = "최저: \(Int(weatherInformation.temp.minTemp - 273.15))℃"
        self.maxTempLabel.text = "최대: \(Int(weatherInformation.temp.maxTemp - 273.15))℃"
    }
    
    func showAlert(message: String) {
        let alert = UIAlertController(title: "에러", message: message, preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: "확인", style: .default, handler: nil))
        self.present(alert, animated: true, completion: nil)
    }
    
    func getCurrentWeather(cityName: String) {
        guard let url = URL(string: "https://api.openweathermap.org/data/2.5/weather?q=\(cityName)&appid=34c0b6b89d88c55c93ede507f662a185") else { return }
        let session = URLSession(configuration: .default)
        session.dataTask(with: url) { [weak self] data, response, error in
            let successRange = (200..<300)
            guard let data = data, error == nil else { return }
            let decoder = JSONDecoder()
            if let response = response as? HTTPURLResponse, successRange.contains(response.statusCode) {
                guard let weatherInformation = try? decoder.decode(WeatherInformation.self, from: data) else { return }
                DispatchQueue.main.async {
                    self?.weatherStackView.isHidden = false
                    self?.configureView(weatherInformation: weatherInformation)
                }
            } else {
                guard let errorMessage = try? decoder.decode(ErrorMessage.self, from: data) else { return }
                DispatchQueue.main.async {
                    self?.showAlert(message: errorMessage.message)
                }
            }
            
        }.resume()
    }
}

//
//  WeatherInformation.swift
//  Weather
//
//  Created by TAEJANIM on 2021/11/23.
//

import Foundation

struct WeatherInformation: Codable {
    let weather: [Weather]
    let temp: Temp
    let name: String
    
    enum CodingKeys: String, CodingKey {
        case weather
        case temp = "main"
        case name
    }
}

struct Weather: Codable {
    let id: Int
    let main: String
    let description: String
    let icon: String
}

struct Temp: Codable {
    let temp: Double
    let feelsLike: Double
    let minTemp: Double
    let maxTemp: Double
    
    enum CodingKeys: String, CodingKey {
        case temp
        case feelsLike = "feels_like"
        case minTemp = "temp_min"
        case maxTemp = "temp_max"
    }
}

//
//  ErrorMessage.swift
//  Weather
//
//  Created by TAEJANIM on 2021/11/23.
//

import Foundation

struct ErrorMessage: Codable {
    let message: String
}

Outro

結果