Question

我正在尝试与URLSession委托建立ssl连接，这是我收到的错误消息：

Objective-C方法'URLSession：didReceiveChallenge：completionHandler：'由方法提供'URLSession（：didReceiveChallenge：completionHandler :)'与可选的需求方法'URLSession（：didReceiveChallenge：completionHandler :)'冲突在协议'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

你现在使用Swift 2吗？我在更新到Swift 2时开始出现此错误。

我可以通过将其更改为：

来解决此问题

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

Answer 2

正确的方法签名是：

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

其中NSURLCredential参数必须是可选的（在可选值后面带问号（？））。

请参阅apple documentation。

URLsession委托功能出错

2 个答案: