ios - URLsession 委托(delegate)函数出错

Question

我正在尝试与 URLSession 委托(delegate)建立 ssl 连接，这是我收到的错误消息:

Objective-C method 'URLSession:didReceiveChallenge:completionHandler:' provided by method 'URLSession(:didReceiveChallenge:completionHandler:)' conflicts with optional requirement method 'URLSession(:didReceiveChallenge:completionHandler:)' in protocol 'NSURLSessionDelegate'

 func URLSession(session: NSURLSession,
    didReceiveChallenge challenge:
    NSURLAuthenticationChallenge,
    completionHandler:
    (NSURLSessionAuthChallengeDisposition,
    NSURLCredential!) -> Void) {

        let serverTrust: SecTrustRef = challenge.protectionSpace.serverTrust!
        let serverCert: SecCertificateRef = SecTrustGetCertificateAtIndex(serverTrust, 0).takeUnretainedValue()
        let serverKey: NSData = SecCertificateCopyData(serverCert).takeRetainedValue()

        let bundle: NSBundle = NSBundle.mainBundle()
        let mainbun = bundle.pathForResource("ca", ofType: "der")
        let key: NSData = NSData(contentsOfFile: mainbun!)!
     //   let turntocert: SecCertificateRef =
      //  SecCertificateCreateWithData(kCFAllocatorDefault, key).takeRetainedValue()

        if serverKey == key {

            let credential = NSURLCredential(forTrust: challenge.protectionSpace.serverTrust!)

            challenge.sender!.useCredential(credential, forAuthenticationChallenge: challenge)

            completionHandler(NSURLSessionAuthChallengeDisposition.UseCredential,credential)

        }

        else{

            challenge.sender!.cancelAuthenticationChallenge(challenge)
            completionHandler(NSURLSessionAuthChallengeDisposition.CancelAuthenticationChallenge, nil)

        }
}

func URLSession(session: NSURLSession, task: NSURLSessionTask, willPerformHTTPRedirection response: NSHTTPURLResponse, newRequest request: NSURLRequest, completionHandler: (NSURLRequest!) -> Void) {
    var newRequest : NSURLRequest? = request
    print(newRequest?.description);
    completionHandler(newRequest)
}

Answer 1

您现在使用 Swift 2 吗？我在更新到 Swift 2 时开始收到此错误。

我可以通过将其更改为:

func URLSession(session: NSURLSession, 
                task: NSURLSessionTask, 
                didReceiveChallenge challenge: NSURLAuthenticationChallenge,  
                completionHandler: (NSURLSessionAuthChallengeDisposition, NSURLCredential?) 
                -> Void) {
            // your code
}