Swift：尝试对用户进行编码并传递到UTF8

我使用的API在登录屏幕中不使用头来验证用户凭据。我想对电子邮件进行编码并传递到UTF8，以防电子邮件或传递中有“+”之类的字符。这是我的密码：

func logIn() {


    var email = emailTextField.text
    var pass = passwordTextField.text

    var encodedEmail = email.stringByAddingPercentEncodingWithAllowedCharacters(NSCharacterSet.URLHostAllowedCharacterSet())
    var encodedPass = pass.stringByAddingPercentEncodingWithAllowedCharacters(NSCharacterSet.URLHostAllowedCharacterSet())

    var url = "https://www.photoshelter.com/psapi/v3/mem/authenticate?api_key=\(api_key)&email=\(encodedEmail!)&password=\(encodedPass!)&mode=token"


    var baseURL:NSURL? = NSURL(string: url)
    var request: NSMutableURLRequest? = NSMutableURLRequest(URL: baseURL!)
    var session = NSURLSession.sharedSession()
    var task = session.dataTaskWithRequest(request!, completionHandler: { (data, response, error) -> Void in
        dispatch_async(dispatch_get_main_queue(), { () -> Void in


            if response == nil {
                UIAlertView(title: "PhotoShelter", message: "No internet connection", delegate: nil, cancelButtonTitle: "Cancel").show()
            } else {
                var responseObject: AnyObject? = NSJSONSerialization.JSONObjectWithData(data, options: nil, error: nil)
                var status: AnyObject? = responseObject?.objectForKey("status")

                if status as String != "ok" {
                    UIAlertView(title: "PhotoShelter", message: "Invalid Credentials", delegate: nil, cancelButtonTitle: "OK").show()
                } else {

                    var tokenString: AnyObject? = responseObject?.objectForKey("data")
                    var token: AnyObject? = tokenString?.objectForKey("token")
                    println(token!)


                }

            }

        })
    })
    task.resume()
}

它运行正常，我得到的令牌打印没有问题，定期登录。当我添加带有“+”的电子邮件时，baseURL不会读取它。它将“@”符号转换为%40，但忽略“+”

我还想指出，当我使用：

var encodedEmail = email.stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding)
var encodedPass = pass.stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding)

---

它也不起作用。有没有办法解决这个问题

代码正在执行您要求的操作。你只是问得不对。您要求它获取一个字符串，并使用百分比编码将给定NSCharacterSet中的所有字符转换为非。（顺便说一句，您并不是试图将用户名和密码编码到UTF-8中，而是试图对其进行百分比编码或URL编码。）

您要传递的字符集包括+，因为URL中允许+

要获得所需的结果，需要提供一个不包含+的字符集。我不知道有什么好的、面向URL的预定义集可以做到这一点，所以您必须自己制作。这是一种方法：

import Foundation

let x: NSString = "some+other@host.xxx"
let modifiedHostCharacterSet: NSMutableCharacterSet = NSCharacterSet.URLHostAllowedCharacterSet().mutableCopy() as NSMutableCharacterSet
modifiedHostCharacterSet.removeCharactersInString("+")

x.stringByAddingPercentEncodingWithAllowedCharacters(modifiedHostCharacterSet)

这个片段是为了在Xcode游戏场或REPL中演示您想要的结果