NSURLSessionを用いたHTTP通信(Handlerを用いた処理)

Preview connection001

iOS9からリクエスト先によってはATSを無効化・対処する必要があります

Swift 3.0

//
//  ViewController.swift
//  Connection004
//
//  Created by Misato Morino on 2016/08/15.
//  Copyright © 2016年 Misato Morino. All rights reserved.
//

import UIKit

class ViewController: UIViewController, URLSessionDelegate, URLSessionDataDelegate {

       override func viewDidLoad() {
        super.viewDidLoad()

        self.view.backgroundColor = UIColor.lightGray

        // 表示用のTextViewを用意.
        let myTextView = UITextView(frame: CGRect(x: 10, y: 50, width: self.view.frame.width - 20, height: 500))

        myTextView.backgroundColor = UIColor(red: 0.9, green: 0.9, blue: 1, alpha: 1.0)
        myTextView.layer.masksToBounds = true
        myTextView.layer.cornerRadius = 20.0
        myTextView.layer.borderWidth = 1
        myTextView.layer.borderColor = UIColor.black.cgColor
        myTextView.font = UIFont.systemFont(ofSize: CGFloat(20))
        myTextView.textColor = UIColor.black
        myTextView.textAlignment = NSTextAlignment.left
        myTextView.dataDetectorTypes = UIDataDetectorTypes.all
        myTextView.layer.shadowOpacity = 0.5
        myTextView.layer.masksToBounds = false
        myTextView.isEditable = false
        self.view.addSubview(myTextView)

        // 通信先のURLを生成.
        let myUrl:NSURL = NSURL(string: "http://xxx/hello.php")!
        // セッションの生成.
        let session = URLSession(configuration: URLSessionConfiguration.default)
        // 通信のタスクを生成.
        let task = session.dataTask(with: url as URL, completionHandler: {
            (data, response, err) in

            if let _data = data {
                // 帰ってきたデータを文字列に変換.
                let getData: NSString = NSString(data: _data, encoding: String.Encoding.utf8.rawValue)!

                // バックグラウンドだとUIの処理が出来ないので、メインスレッドでUIの処理を行わせる.
                DispatchQueue.main.async(execute: {
                    myTextView.text = getData as String
                })
            }
        })

        // タスクの実行.
        task.resume()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    } 
}

Swift 2.3

//
//  ViewController.swift
//  Connection004
//
//  Created by Misato Morino on 2016/08/15.
//  Copyright © 2016年 Misato Morino. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        self.view.backgroundColor = UIColor.lightGrayColor()

        // 表示用のTextViewを用意.
        let myTextView = UITextView(frame: CGRectMake(10, 50, self.view.frame.width - 20, 500))

        myTextView.backgroundColor = UIColor(red: 0.9, green: 0.9, blue: 1, alpha: 1.0)
        myTextView.layer.masksToBounds = true
        myTextView.layer.cornerRadius = 20.0
        myTextView.layer.borderWidth = 1
        myTextView.layer.borderColor = UIColor.blackColor().CGColor
        myTextView.font = UIFont.systemFontOfSize(CGFloat(20))
        myTextView.textColor = UIColor.blackColor()
        myTextView.textAlignment = NSTextAlignment.Left
        myTextView.dataDetectorTypes = UIDataDetectorTypes.All
        myTextView.layer.shadowOpacity = 0.5
        myTextView.layer.masksToBounds = false
        myTextView.editable = false
        self.view.addSubview(myTextView)

        // 通信先のURLを生成.
        let myUrl:NSURL = NSURL(string: "http://xxx/hello.php")!
        // セッションの生成.
        let session = NSURLSession(configuration: NSURLSessionConfiguration.defaultSessionConfiguration())
        // 通信のタスクを生成.
        let task = session.dataTaskWithURL(url, completionHandler: {
            (data, response, err) in

            if let _data = data {
                // 帰ってきたデータを文字列に変換.
                let getData: NSString = NSString(data: _data, encoding: NSUTF8StringEncoding)!

                // バックグラウンドだとUIの処理が出来ないので、メインスレッドでUIの処理を行わせる.
                dispatch_async(dispatch_get_main_queue(), {
                    myTextView.text = getData as String
                })
            }
        })

        // タスクの実行.
        task.resume()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}

2.xと3.xの差分

  • NSURLSessionからURLSessionに変更(他も同じく)
  • dispatch_async(dispatch_get_main_queue(), { からDispatchQueue.main.async(execute: {に変更
  • dataTaskWithURL(url) から dataTask(with: url as URL) に変更
  • session.dataTaskWithURL(url, completionHandler: { から session.dataTask(with: url as URL, completionHandler: { に変更

Reference