swift 上传图片和参数 upload image with params

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)

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("rn--(boundaryConstant)rn".dataUsingEncoding(NSUTF8StringEncoding)!)

        if value is NetData {
            // add image
            var postData = value as NetData


            //uploadData.appendData("Content-Disposition: form-data; name="(key)"; filename="(postData.filename)"rn".dataUsingEncoding(NSUTF8StringEncoding)!)

            // append content disposition
            var filenameClause = " filename="(postData.filename)""
            let contentDispositionString = "Content-Disposition: form-data; name="(key)";(filenameClause)rn"
            let contentDispositionData = contentDispositionString.dataUsingEncoding(NSUTF8StringEncoding)
            uploadData.appendData(contentDispositionData!)


            // append content type
            //uploadData.appendData("Content-Type: image/pngrnrn".dataUsingEncoding(NSUTF8StringEncoding)!) // mark this. 
            let contentTypeString = "Content-Type: (postData.mimeType.getString())rnrn"
            let contentTypeData = contentTypeString.dataUsingEncoding(NSUTF8StringEncoding)
            uploadData.appendData(contentTypeData!)
            uploadData.appendData(postData.data)

        }else{
            uploadData.appendData("Content-Disposition: form-data; name="(key)"rnrn(value)".dataUsingEncoding(NSUTF8StringEncoding)!)
        }
    }
    uploadData.appendData("rn--(boundaryConstant)--rn".dataUsingEncoding(NSUTF8StringEncoding)!)



    // return URLRequestConvertible and NSData
    return (Alamofire.ParameterEncoding.URL.encode(mutableURLRequest,parameters: nil).0,uploadData)
}

（编辑：李大同）

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