Q&A
###前提・実現したいこと
viewController,secondViewController,API.swiftと3つのクラスを作成しました。API.swiftにはhttp通信の処理を作成しました。
viewControllerにおいて、memidText,passwdTextに入力されたデータをSubmitButtonを押した瞬間に、webサーバーにpost送信して、jsonで返ってきたデータをviewControllerで辞書に入れて、performSegueで値をもたせて画面遷移し、secondViewControllerのparameterに値をいてれ、そこからsecondViewControllerのmemLabel,passwdLabelのに表示させたいです。viewControllerのSubmitButtonでAPI.swiftのクラスのインスタンスを作成して、メソットなりプロパティなりの処理をしています。
ここで、API.swiftの処理されタイミングが、submitButtonが押されるタイミングではないため、submitButtonの中のAPI.swiftのインスタンスプロパティが空のままで、performSegueが呼ばれ画面遷移されている状態です。
どうすればいいでしょうか？
// // ViewController.swift import UIKit class ViewController: UIViewController { @IBOutlet weak var memidLabel: UILabel! @IBOutlet weak var passwdLabel: UILabel! @IBOutlet weak var memidText: UITextField! @IBOutlet weak var passwd: UITextField! var params: [String:Any] = [:] var APIparams:[String: String] = [:] override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } @IBAction func SubmitButton(_ sender: Any) { params["user"] = self.memidText.text params["password"] = self.passwd.text let user = try! User(params: params) user.httpconnect() memidLabel.text = user.result_memid passwdLabel.text = user.result_passwd self.APIparams["memid"] = user.result_memid self.APIparams["passwd"] = user.result_passwd self.performSegue(withIdentifier: "toSecondViewController", sender: self.APIparams) } override func prepare(for segue: UIStoryboardSegue, sender: Any?) { if segue.identifier == "toSecondViewController" { let SecondViewController = segue.destination as! SecondViewController SecondViewController.parameters = sender as! [String : String] } } }
// // SecondViewController.swift import UIKit class SecondViewController: UIViewController { var parameters: [String: String] = [:] @IBOutlet weak var memidLabel: UILabel! @IBOutlet weak var passwdLabel: UILabel! override func viewDidLoad() { super.viewDidLoad() print("parametersmの値: (parameters)") memidLabel.text = parameters["memid"] passwdLabel.text = parameters["passswd"] } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } }
// // API.swift // User_laggage // import Foundation import Alamofire import SwiftyJSON // JSONのvalidation enum JSONDecodeError: Error { case invalidFormat(json: Any) case missingValue(key: String, actualValue: Any?) } public class User { var memid: String = "" var passwd: String = "" var params: [String:Any] = [:] // JSON response data var result_memid: String = "" var result_passwd: String = "" static var baseurl: String = "" let request = NSMutableURLRequest(url: NSURL(string: baseurl)! as URL) var base_url: String = "" init(params: Any) throws { guard let params = params as? [String: Any] else { return } guard let memid = params["user"] as? String else { throw JSONDecodeError.missingValue(key: "user", actualValue: params["user"]) } guard let passwd = params["password"] as? String else { throw JSONDecodeError.missingValue(key: "password", actualValue: params["password"]) } self.memid = memid self.passwd = passwd self.params = [ "user": memid, "password": passwd ] } func httpconnect(){ self.request.httpMethod = "POST" self.request.addValue("application/json", forHTTPHeaderField: "Content-Type") do{ self.request.httpBody = try JSONSerialization.data(withJSONObject: params, options: .prettyPrinted) let task:URLSessionDataTask = URLSession.shared.dataTask(with: request as URLRequest, completionHandler: {(data,response,error) -> Void in if error != nil { print(error as Any) print("エラー: エラーが発生！！！！！") return } let resultData = String(data: data!, encoding: .utf8)! var personalData: Data = resultData.data(using: String.Encoding.utf8)! print("result:(resultData)") print("response:(String(describing: response))") do { let json = try JSONSerialization.jsonObject(with: personalData, options: JSONSerialization.ReadingOptions.allowFragments) let top = json as! NSArray // トップレベルが配列 for roop in top { let next = roop as! NSDictionary print("memid: (next["memid"] as! String)") print("passwd: (next["passwd"] as! String)") self.result_memid = next["memid"] as! String self.result_passwd = next["passwd"] as! String print("self.result_memid: (self.result_memid)") print("self.result_passwd: (self.result_passwd)") } } catch { print("error: Jsonパース失敗！！！！！") // パースに失敗したときにエラーを表示 } }) task.resume() }catch{ print("Error:(error)") return } } }
parametersmの値: ["passwd": "", "memid": ""] result:[{"memid":"0000000001000","passwd":"54325740"}] response:Optional(<NSHTTPURLResponse: 0x60c000028ea0> { URL: } { status code: 200, headers { "Cache-Control" = "max-age=86400"; Connection = "Keep-Alive"; "Content-Length" = 47; "Content-Type" = "application/json; charset=utf-8"; Date = "Fri, 20 Oct 2017 06:02:45 GMT"; Expires = "Sat, 21 Oct 2017 06:02:45 GMT"; "Keep-Alive" = "timeout=15, max=100"; Server = Apache; "X-Powered-By" = "PHP/5.5.8"; } }) memid: 0000000001000 passwd: 54325740 self.result_memid: 0000000001000 self.result_passwd: 54325740
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