Swift 2，解析JSON，空响应

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?

我最近使用PHP和AJAX制作了一个基于Web的单屏幕应用程序。我想把这个应用程序移植到iOS,并开始自学Swift。我让应用程序在Swift 1中运行得很好,但是自从我更新到xCode 7.2和Swift 2以便我可以在我的iPhone上使用iOS 9试用该应用程序时,代码完全没有功能。从这里开始,我现在有了新的代码,据我所知,它应该可以工作,但我得到了一个空的响应。怎么了?

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.

我的想法是从数据库中获取数据并查看“success”(db中的布尔值)是返回1还是0.如果返回1,则执行segue到下一页,如果没有,则创建一个警报说不正确的用户名和密码。

Thank you in advance!

先感谢您!

2 个解决方案

#1

1. Create the url

   创建网址

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

   let url = NSURL(字符串:“http://google.com”)

2. Create the request

   创建请求

   let request = NSMutableUrlRequest(url: url!)

   let request = NSMutableUrlRequest(url:url!)

3. Add data and request methods

   添加数据和请求方法

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

   request.HTTPMethod =“POST”request.HTTPBody =“username = \(username text.text!)”。dataUsingEncoding(NSUTF8StringEncoding)

4. Send the connection

   发送连接

     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 
        }
    })
   

#2

Use NSURLConnectionDelegate or AFNetworking for networking requests. Following is an implementation using NSURLConnection.

使用NSURLConnectionDelegate或AFNetworking进行网络请求。以下是使用NSURLConnection的实现。

I have implemented LoginViewController class for you. Hook the following loginButtonAction to 'Login/SignIn/Done' button on your UI.

我已经为你实现了LoginViewController类。将以下loginButtonAction挂钩到UI上的“Login / SignIn / Done”按钮。

import UIKit
import Foundation
class LoginViewController: UIViewController, NSURLConnectionDelegate {
@IBOutlet weak var username_textField: UITextField!
@IBOutlet weak var password_TextFieldOutlet: UITextField!
@lazy var data = NSMutableData()

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

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)
    startConnection()
}

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

func startConnection(){
let username = username_textField.text
    let password = password_TextFieldOutlet.text
    let urlPath: String = "~~URL~~/login.php?username=\(username)&password=\(password)"
    var url: NSURL = NSURL(string: urlPath)
    var request: NSURLRequest = NSURLRequest(URL: url)
    var connection: NSURLConnection = NSURLConnection(request: request, delegate: self, startImmediately: false)
    connection.start()
}

func connection(connection: NSURLConnection!, didReceiveData data: NSData!){
    self.data.appendData(data)
}

func loginButtonAction(sender: UIButton!){
    startConnection()
}

func connectionDidFinishLoading(connection: NSURLConnection!) {
    var err: NSError
    var jsonResult: NSDictionary = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: nil) as NSDictionary
//Here I am printing the results, you can check the results and based on response Bool you can perform segue to next view controller.
    println(jsonResult)

}
}