消息是空白的？

Question

我有一些代码从文本框中获取文本并通过 POST 消息将其发送到服务器，然后服务器将其发送到电子邮件地址。

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)
}
}

按下按钮时电子邮件会通过，但电子邮件中没有任何内容，只是空白。是的，文本字段中有文本。你能看出我哪里出错了吗？

任何帮助表示赞赏， 谢谢。

Answer 1

您的文字可能无法显示的原因有多种：

--> 你的故事板和你的 ViewController 之间的映射不知何故被切断了。尝试重新连接它们。

--> 你可以尝试专门使用“self”

var dataString = self.emailText.text;

--> 您可以使用 NSData 提供的以下初始化程序：

NSData(base64String:String, options:NSDataBase64DecodingOptions)

--> 放置一个调试点或编写一个简单的打印语句来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： 试试这样的

    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)\r\n")

    let endBound = "\r\n--\(boundary)\r\n"
    let codeInfo = "Content-Disposition: form-data; name=\"code\"\r\n\r\n\(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)")


        }
    }

//-----

尝试调试您的代码，看看您是否真的在“dataString”中有文本。 还要确保“requestBodyData”不为零

如果它为 nil 或为空，这可能意味着故事板的 emailText 未正确连接代码“@IBOutlet”

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

或者可以这样检查

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