Swift 2，解析JSON，空响应

Question

I recently made a single-screen web-based application using PHP and AJAX. I want to port this app to iOS, and have started to teach myself Swift. I had the application working perfectly in Swift 1, but since I updated to xCode 7.2 and Swift 2 so that I could try the app on my iPhone with iOS 9, the code was completely non-functional. From here, I have new code now, and as far as I can see, it should work, but I am getting an empty response. What is wrong?

import UIKit
import Foundation

class LoginViewController: UIViewController, UITextFieldDelegate {



    @IBOutlet weak var username_textField: UITextField!

    @IBOutlet weak var password_TextFieldOutlet: UITextField!


    @IBAction func password_TextFieldAction(sender: AnyObject) {


        let username = username_textField.text
        let password = password_TextFieldOutlet.text
        var urlRequest = "~~URL~~/login.php?username=\(username)&password=\(password)"



    }


    override func viewDidLoad() {
        super.viewDidLoad()
    }

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


}

The idea is I was to get my data from the database and see if "success" (a boolean value in the db) returns 1 or 0. If it returns 1, then perform a segue to next page, if not, create an alert saying incorrect username and password.

Thank you in advance!

Answer 1

1. Create the url

   let url = NSURL(string: "http://google.com")

2. Create the request

   let request = NSMutableUrlRequest(url: url!)

3. Add data and request methods

   request.HTTPMethod = "POST" request.HTTPBody = "username=\(username text.text!)".dataUsingEncoding(NSUTF8StringEncoding)

4. Send the connection

     NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue()) { 
        (response, data, error) -> Void in
    if data != nil && error == nil {
        if let response = String(data: data!, encoding: NSUTF8StringEncoding) { 
             //here is where you now have your response 
        }
    })