ios - 当我创建一个类并调用在该类中创建的方法时，我遇到错误，它在函数中重定向两次并显示 nil

Question

我正在使用 Swift IOS 编码开发 Rest API。我的问题是，当我从 Controller 请求数据时，它正在工作，但是当我创建一个类并调用在该类中创建的方法时，我遇到错误，它在函数中重定向两次并显示为零。

我的类(class)请求函数是:

func MakeRequestToServer(url:String, httpMethod:String, parameters: String) -> (NSURLResponse, NSData, NSError) {

    var responseValue = NSURLResponse()
    var dataValue = NSData()
    var errorValue = NSError()

    var URL: NSURL = NSURL(string: url)!
    var request:NSMutableURLRequest = NSMutableURLRequest(URL:URL)
    request.HTTPMethod = httpMethod

    let stringConversionToBase64 = "testu"
    let base64Data = stringConversionToBase64.dataUsingEncoding(NSUTF8StringEncoding)
    let base64String = base64Data?.base64EncodedStringWithOptions(.allZeros)
    request.setValue(base64String!, forHTTPHeaderField:"customerKey")

    request.setValue("127.0.0.1", forHTTPHeaderField:"clientIpAddress")

    request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")


    request.HTTPBody = parameters.dataUsingEncoding(NSUTF8StringEncoding);

    NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue())
        {
            (response, data, error) in

            responseValue = response
            dataValue = data
            // errorValue = error

            println("respo\(response)")
            // println("json from server: \(json)")

    }
    return (responseValue,dataValue,errorValue)
}

从 Controller 中我调用这个方法就像......

 var repso = MakeRequestToServer(finalURL, requestType, postString)

Answer 1

当然它返回nil。您将在异步请求完成之前返回。重构此函数以使用completionHandler。提示:

func makeRequestToServer(url: String, httpMethod: String, parameters: String, completionHandler: ((data: NSData?, error: NSError?)->())) {
    //
    NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue()) { (response, data, error) -> Void in
        //
        completionHandler(data: data, error: error)
    }
}