ios - 在Swift中将NSMutableData转换为NSString

目前，我正在玩Swift。

我想使用NSURLConnection制作一个小型下载器应用程序。到目前为止，一切正常，但是我有两个问题。

为什么我无法将响应数据转换为NSString？

如何将Websever的NSURLResponse转换为NSHTTPURLResponse？

到目前为止，我的代码如下所示:

import Foundation

class Downloader: NSObject, NSURLConnectionDelegate {

    let urlString: String
    var responseData: NSMutableData = NSMutableData()
    var responseMessage: NSURLResponse = NSURLResponse()

    init(urlString: String) {
        self.urlString = urlString.stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding);
    }

    func startDownloaderWithUrl() {
        let url: NSURL = NSURL.URLWithString(self.urlString);
        let r: NSURLRequest = NSURLRequest(URL: url);
        let connection:NSURLConnection = NSURLConnection(
            request: r,
            delegate: self,
            startImmediately: true);
    }

    func connection(connection: NSURLConnection!, didFailWithError error: NSError!) {
        NSLog("Connection failed.\(error.localizedDescription)")
    }

    func connection(connection: NSURLConnection, didRecieveResponse response: NSURLResponse)  {
        NSLog("Recieved response")
        self.responseMessage = response;
    }

    func connection(didReceiveResponse: NSURLConnection!, didReceiveResponse response: NSURLResponse!) {
        self.responseData = NSMutableData()
    }

    func connection(connection: NSURLConnection!, didReceiveData data: NSData!) {
        self.responseData.appendData(data)
    }

    func connectionDidFinishLoading(connection: NSURLConnection!) {
        let responseString: NSString = NSString(data: self.responseData, encoding: NSUTF8StringEncoding);

        NSLog("%@", "Finished Loading");
        //NSLog("%@", self.responseData);
        NSLog("%@", responseString);
    }
 }

尽管我的responseString有大量字节，但我的nil始终是responseData。其次，如何将响应消息转换为NSHTTPURLResponse？

最佳答案

尝试tis

func connection(didReceiveResponse: NSURLConnection!, didReceiveResponse response: NSURLResponse!) {
    self.data = NSMutableData()
}

func connection(connection: NSURLConnection!, didReceiveData data: NSData!) {
    self.data.appendData(data)
}

func connectionDidFinishLoading(connection: NSURLConnection!) {
    var dta = NSString(data: data, encoding: NSUTF8StringEncoding)
    println("the string is: \(dta)")

    }