Swift 2，解析JSON，空響應

Question

我最近使用PHP和AJAX製作了一個基於Web的單屏應用程序。我想將這個應用移植到iOS上，並開始自學Swift。我的應用程序在Swift 1中完美運行，但是由於我更新了xCode 7.2和Swift 2，因此我可以在iOS 9上使用我的iPhone嘗試應用程序，但代碼完全無法使用。從這裏開始，我有了新的代碼，並且據我所知，它應該可以工作，但我得到了一個空的迴應。哪裏不對？

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. 
    } 


} 

的想法是我是從數據庫中獲取我的數據，看看是否「成功」（一個布爾值的分貝值）返回1或0。如果它返回1，然後執行一個原因請看下頁如果沒有，則創建一條警告，提示用戶名和密碼不正確。

預先感謝您！

Answer 1

1. 創建URL

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

2. 創建請求

   let request = NSMutableUrlRequest(url: url!)

3. 添加數據和請求方法

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

4. 發送連接

   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 
       } 
   }) 
   

Answer 2

使用NSURLConnectionDelegate或AFNetworking聯網請求。以下是使用NSURLConnection的實現。

我爲你實施了LoginViewController班。 將以下loginButtonAction掛鉤到您的用戶界面上的「登錄/登錄/完成」按鈕。

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) 

} 
}