[iOS/Swift] Alamofire를 이용한 앱 구현(우편번호 검색 앱을 예로)

앱 기능

코드 예

// このコードは参考にした記事より流用した
struct AddressModel: Decodable {
    var results: [Result]

    struct Result: Decodable {
        var address1: String
        var address2: String
        var address3: String
        var kana1: String
        var kana2: String
        var kana3: String
    }
}

import UIKit
import Alamofire

class ViewController: UIViewController {

    private var addresses: AddressModel?

    @IBOutlet weak var zipCodeTextField: UITextField!
    @IBOutlet weak var seachButton: UIButton!
    @IBOutlet weak var resultLabel: UILabel!

    @IBAction func tapSeachButton(_ sender: Any) {
        self.getAddress(zipCode: zipCodeTextField.text)
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }

    private func getAddress(zipCode: String?) {
        self.validate(zipCode: zipCode)

        let baseUrl = "https://zipcloud.ibsnet.co.jp/api/"
        let searchUrl = "\(baseUrl)search"
        let parameters: [String: Any] = ["zipcode": zipCode!]
        let headers: HTTPHeaders = ["Content-Type": "application/json"]

        self.requestAPI(url: searchUrl, parameters: parameters, headers: headers)
    }

    private enum ErrorType:String {
        case zipCodeNil = "郵便番号が確認できません"
        case zipCodeBrank = "郵便番号を入力してください"
        case zipCodeLengthNot7 = "郵便番号は7桁で入力してください"
    }

    private func validate(zipCode: String?){
        guard let zipCode = zipCode else { self.showAlert(error: .zipCodeNil); return }
        if zipCode == "" { self.showAlert(error: .zipCodeBrank); return }
        if zipCode.lengthOfBytes(using: .utf8) != 7 { self.showAlert(error: .zipCodeLengthNot7); return }
    }

    private func showAlert(error: ErrorType) {
        let alert = UIAlertController(title: "検索に失敗しました", message: error.rawValue, preferredStyle: .alert)
        let action = UIAlertAction(title: "OK", style: .default, handler: nil)
        alert.addAction(action)
        self.present(alert, animated: true, completion: nil)
    }

    private func requestAPI(url:String,parameters:[String:Any],headers:HTTPHeaders) {
        AF.request(url, method: .get, parameters: parameters, encoding: URLEncoding(destination: .queryString), headers: headers).responseJSON { response in
            guard let data = response.data else { return }
            do {
                try self.parse(data: data)
            } catch let error {
                print("Error: \(error)")
                self.showError()
            }
        }
    }

    private func parse(data:Data) throws {
        self.addresses = try JSONDecoder().decode(AddressModel.self, from: data)
        if let address = self.addresses {
            self.show(result: "\(address.results[0].address1) \(address.results[0].address2) \(address.results[0].address3)")
        }
    }

    private func show(result:String){
        resultLabel.text = result
    }

    private func showError(){
        resultLabel.text = "検索結果が取得できませんでした"
    }
}

참고 자료