swift 上传图片和参数 upload image with params

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let docDir:AnyObject = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0]let imagePath = docDir + "/myPic.jpg"var imageData = NSData(contentsOfFile: imagePath, options: NSDataReadingOptions.DataReadingMappedIfSafe, error: nil)var parameters = [            "pic"           :NetData(nsData: imageData!, filename: "customName.jpg"),            "otherParm"     :"Value"        ]    let urlRequest = self.urlRequestWithComponents("http://www.example.com/upload.php", parameters: parameters)

Alamofire.upload(urlRequest.0, urlRequest.1)    .progress { (bytesWritten, totalBytesWritten, totalBytesExpectedToWrite) in        println("\(totalBytesWritten) / \(totalBytesExpectedToWrite)")    }    }

func urlRequestWithComponents(urlString:String, parameters:NSDictionary) -> (URLRequestConvertible, NSData) {    // create url request to send    var mutableURLRequest = NSMutableURLRequest(URL: NSURL(string: urlString)!)    mutableURLRequest.HTTPMethod = Alamofire.Method.POST.rawValue    //let boundaryConstant = "myRandomBoundary12345"    let boundaryConstant = "NET-POST-boundary-\(arc4random())-\(arc4random())"    let contentType = "multipart/form-data;boundary="+boundaryConstant    mutableURLRequest.setValue(contentType, forHTTPHeaderField: "Content-Type")    // create upload data to send    let uploadData = NSMutableData()    // add parameters    for (key, value) in parameters {        uploadData.appendData("\r\n--\(boundaryConstant)\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)        if value is NetData {            // add image            var postData = value as NetData            //uploadData.appendData("Content-Disposition: form-data; name=\"\(key)\"; filename=\"\(postData.filename)\"\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)            // append content disposition            var filenameClause = " filename=\"\(postData.filename)\""            let contentDispositionString = "Content-Disposition: form-data; name=\"\(key)\";\(filenameClause)\r\n"            let contentDispositionData = contentDispositionString.dataUsingEncoding(NSUTF8StringEncoding)            uploadData.appendData(contentDispositionData!)            // append content type            //uploadData.appendData("Content-Type: image/png\r\n\r\n".dataUsingEncoding(NSUTF8StringEncoding)!) // mark this.             let contentTypeString = "Content-Type: \(postData.mimeType.getString())\r\n\r\n"            let contentTypeData = contentTypeString.dataUsingEncoding(NSUTF8StringEncoding)            uploadData.appendData(contentTypeData!)            uploadData.appendData(postData.data)        }else{            uploadData.appendData("Content-Disposition: form-data; name=\"\(key)\"\r\n\r\n\(value)".dataUsingEncoding(NSUTF8StringEncoding)!)        }    }    uploadData.appendData("\r\n--\(boundaryConstant)--\r\n".dataUsingEncoding(NSUTF8StringEncoding)!)    // return URLRequestConvertible and NSData    return (Alamofire.ParameterEncoding.URL.encode(mutableURLRequest, parameters: nil).0, uploadData)}

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