问题与Alamofire挑战委托和转义关闭

我正在使用AF并使用它的委托来捕获我的服务器返回的身份验证挑战。问题与Alamofire挑战委托和转义关闭

func connectGetRequest(_ url : URL){ 

    let sessionManager = Alamofire.SessionManager.default 
    sessionManager.request(url).responseString { response in 
     print("Response String: \(response.result.value)") 
    } 
    let delegate: Alamofire.SessionDelegate = sessionManager.delegate 


    delegate.taskDidReceiveChallengeWithCompletion = { session, task, challenge, completionHander in 
     print("session is \(session), task is \(task) challenge is \(challenge.protectionSpace.authenticationMethod) and handler is \(completionHander)") 
     if(challenge.protectionSpace.authenticationMethod == "NSURLAuthenticationMethodServerTrust"){ 

      completionHander(.performDefaultHandling,nil) 
     }else{ 

      print("challenge type is \(challenge.protectionSpace.authenticationMethod)") 

     // Following line give me the error: "passing non-escaping parameter 'completionHander' to function expecting an @escaping closure" 

self.handleAuthenticationforSession(challenge,completionHandler: completionHander) 
     } 
    } 

    delegate.dataTaskDidReceiveData = {session , task, data in 

     print("received data \(data)") 
    } 

} 


func handleAuthenticationforSession(_ challenge: URLAuthenticationChallenge,completionHandler: @escaping (Foundation.URLSession.AuthChallengeDisposition, URLCredential?) -> Void) { 


     Authhandler.handleChallenge(forURLSessionChallenge: challenge, completionHandler: completionHandler) 


}

的问题，我有：

如果我使用上面的代码，因为它是，我得到

错误：“传递非逃逸参数‘completionHander’的功能期待的@逃脱关闭“

如果我让函数handleAuthenticationSession的参数不转义，我得到：

func handleAuthenticationforSession(_ challenge: URLAuthenticationChallenge, 
    completionHandler: (Foundation.URLSession.AuthChallengeDisposition, URLCredential?) -> Void) { 

    }

错误：“闭合使用非逃逸参数‘完成’的可允许其逸出”

另外，从AuthHandler类handleChallenge方法（这是OBJ-C框架的一部分）的外表如下所示。

-(BOOL)handleChallenge:(NSURLAuthenticationChallenge *)challenge 
         completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, 
                NSURLCredential *credential))completionHandler;

因此，基本上我陷入僵局，而我使用Alamofire的闭包语法委托授权挑战。

来源

2017-05-13 nitinsh99