信息一片空白

Question

我有一些代码，它从文本框中提取文本，并通过POST消息将其发送到服务器，然后服务器将其发送至电子邮件地址。

class ViewController: UIViewController {
@IBOutlet weak var emailText: UITextView!

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}
func sendEmail() {
    let url = NSURL(string:"http://www.fakewebsite.com/email.php")
    let cachePolicy = NSURLRequestCachePolicy.ReloadIgnoringLocalCacheData
    var request = NSMutableURLRequest(URL: url!, cachePolicy: cachePolicy, timeoutInterval: 2.0)
    request.HTTPMethod = "POST"
    // set Content-Type in HTTP header
    let boundaryConstant = "----------V2ymHFg03esomerandomstuffhbqgZCaKO6jy";
    let contentType = "multipart/form-data; boundary=" + boundaryConstant
    NSURLProtocol.setProperty(contentType, forKey: "Content-Type", inRequest: request)
    // set data
    var dataString = emailText.text
    let requestBodyData = (dataString as NSString).dataUsingEncoding(NSUTF8StringEncoding)
    request.HTTPBody = requestBodyData
    // set content length
    //NSURLProtocol.setProperty(requestBodyData.length, forKey: "Content-Length", inRequest: request)
    var response: NSURLResponse? = nil
    var error: NSError? = nil
    let reply = NSURLConnection.sendSynchronousRequest(request, returningResponse:&response, error:&error)
    let results = NSString(data:reply!, encoding:NSUTF8StringEncoding)
    println("API Response: (results)")
}
@IBAction func sendButton(sender: AnyObject) {
    sendEmail()
    println(emailText.text)
}
}

当按下按钮时，电子邮件就会通过，但电子邮件中什么都没有，只是一片空白。是的，文本字段中有文本。你能看出我哪里出了问题吗？

感谢任何帮助，谢谢

Answer 1

您的文本可能无法出现的原因有多种：

-->故事板和ViewController之间的映射在某种程度上被切断了。尝试重新连接它们。

-->你可以尝试并专门使用"自我"

var dataString = self.emailText.text;

-->您可以使用NSData提供的以下初始值设定项：

NSData(base64String:String, options:NSDataBase64DecodingOptions)

-->放置调试点或编写一个简单的打印语句，显示当前数据的长度：

let requestBodyData = (dataString as NSString).dataUsingEncoding(NSUTF8StringEncoding)
//if this print says length is 0 then you dont seem to a valid link between the storyboard and the ViewController
print(requestBodyData.length)
request.HTTPBody = requestBodyData

Answer 2

编辑：试试这个

    let postRequest = NSMutableURLRequest(URL: NSURL(string: "")!)
    let postBody = NSMutableData()
    postRequest.HTTPMethod = "POST"
    // Boundary & Charset
    let boundary = "blahblahblah"
    let charset = "utf-8"
    let contentType = "multipart/form-data; charset=(charset); boundary=(boundary)"
    postRequest.addValue(contentType, forHTTPHeaderField: "Content-Type")
    let stringData = NSMutableString()
    stringData.appendFormat("--(boundary)rn")
    let endBound = "rn--(boundary)rn"
    let codeInfo = "Content-Disposition: form-data; name="code"rnrn(code!)"
    stringData.appendString(codeInfo)
    stringData.appendString(endBound)
    postBody.appendData(stringData.dataUsingEncoding(NSUTF8StringEncoding)!)
    postRequest.HTTPBody = postBody
    let operationQueue = NSOperationQueue()
    NSURLConnection.sendAsynchronousRequest(postRequest, queue: operationQueue) { (response, data, error) -> Void in
        if data != nil {
            let resp = String(data: data!, encoding: NSUTF8StringEncoding)
            print("Response -> (resp)")

        }
    }

//-----

试着调试代码，看看"dataString"中是否真的有文本。还要确保"requestBodyData"不是零

如果它为零或为空，这可能意味着你故事板的emailText与代码"@IBOutlet"没有正确连接

// set data
var dataString = emailText.text
let requestBodyData = (dataString as  NSString).dataUsingEncoding(NSUTF8StringEncoding)

或者可以像这个一样进行检查

let contentType = "multipart/form-data; charset=utf-8; boundary=(boundary)"
request.addValue(contentType, forHTTPHeaderField: "Content-Type")