发布请求始终由可选文本包装 [英] Post request always wrapped by optional text

问题描述

我有一个非常类似的问题，例如为什么http post请求体总是被Swift应用程序中的Optional文本包裹
但我无法将此线程的解决方案应用到我的代码中，因为我不知道有一个request.setValue。
有谁知道我需要做什么才能摆脱Optional？
我的代码：

I have a very similar problem like in Why the http post request body always wrapped by Optional text in the Swift app but I can´t apply the solution from this thread to my code, because I don´t have a request.setValue. Does anyone know what I need to do to get rid of the Optional? My Code:

 @IBAction func LoginButtonTapped(sender: UIButton) {

    let username = UsernameTextField.text
    let password = PasswordTextField.text

    if(username!.isEmpty || password!.isEmpty) {return; }



    let request = NSMutableURLRequest (URL: NSURL(string: "http://myip/loginregister.php")!)
    request.HTTPMethod = "POST"
    let postString = "username=\(username)&password=\(password)"
    request.HTTPBody = postString.dataUsingEncoding(NSUTF8StringEncoding)
    let task = NSURLSession.sharedSession().dataTaskWithRequest(request) { data, response, error in
        guard error == nil && data != nil else {
            // check for fundamental networking error
            print("error=\(error)")
            return
        }

        let data = postString.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)!



        do {
            if let json = try NSJSONSerialization.JSONObjectWithData(data, options: []) as? NSDictionary {
                let success = json["success"] as? Int                                  // Okay, the `json` is here, let's get the value for 'success' out of it
                print("Success: \(success)")
            } else {
                let jsonStr = NSString(data: data, encoding: NSUTF8StringEncoding)    // No error thrown, but not NSDictionary
                print("Error could not parse JSON: \(jsonStr)")
            }
        } catch let parseError {
            print(parseError)                                                          // Log the error thrown by `JSONObjectWithData`
            let jsonStr = NSString(data: data, encoding: NSUTF8StringEncoding)
            print("Error could not parse JSON: '\(jsonStr)'")
        }
    }

    task.resume()

推荐答案

首先从UITextField获取文本时必须解包该值，因为 text U的属性ITextField 允许 nil

You must unwrapping the value when get text from UITextField first, because the text property of UITextField allow nil

let username = UsernameTextField.text!
let password = PasswordTextField.text!

解释更多

当您打开UITextField的文本时，用户名和密码将是而不是变量。
代码比较空应为：

When you unwrap the text of the UITextField, the username and password will be not nil variable. The code compare empty should be:

if(username.isEmpty || password.isEmpty) {return }

如果你没有打开，当你使用这个\（用户名） ，您尝试将 nil able对象转换为字符串，因此字符串结果将附加可选文本。

If you does not unwrap, when you use this "\(username)", your are try to convert a nilable object to string, so the string result will be appended with a "Optional" text.

解决Content-Type请求的问题

将此行粘贴到您的代码中。我不相信你没有 setValue 方法。

Paste this line to your code. I don't believe that you do not have setValue method.

request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField:"Content-Type")

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