Question

目前，我正在玩Swift。

我想用NSURLConnection做一个小型下载程序。到目前为止一切正常，但我有2个问题。

为什么我无法将回复数据转换为NSString？
如何将我的网络搭文NSURLResponse转换为NSHTTPURLResponse？

到目前为止，我的代码看起来像这样：

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);
    }
 }

我的responseString始终为nil，但我的responseData有大量字节。其次，如何将我的回复消息转换为NSHTTPURLResponse？

Answer 1

试试

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)")

    }

Answer 2

将NSMutableData转换为字符串

var YourSting = NSString(data responseData: NSData!, encoding encoding: UInt)

Answer 3

将编码更改为ASCII对我有用。

在Swift中将NSMutableData转换为NSString

3 个答案: