objective-c clear NSURLCredential - NSURLCredentialPersistenceForSession

Question

我在這個方法中使用NSURLCredentials ：

-(void)UserLogin:(NSString *)user andPassWordExists:(NSString *)password completionHandler:(void (^)(NSArray *resultsObject, NSError *error))completionHandler
{


   NSURL *url = [NSURL URLWithString:kIP];
   NSURLRequest *request = [NSURLRequest requestWithURL:url];

    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc]
                                         initWithRequest:request];


    NSURLCredential *credential = [NSURLCredential
                                   credentialWithUser:user
                                   password:password
                                   persistence:NSURLCredentialPersistenceForSession];

    [operation setCredential:credential];

    [[NSOperationQueue mainQueue] addOperation:operation];

    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {

        if (completionHandler) {
            completionHandler(responseObject, nil);
        }

    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {

        if (completionHandler) {
            completionHandler(nil, error);
        }

    }];

    [operation start];
}

現在我想在注銷方法中清除NSURLCredentials，如下所示：

-(void)logout
{
   //Clear NSURLCredentialPersistenceForSession
}

我該怎么做呢？ 我應該重置NSURLCredentials還是在那里清除它們？

UPDATE

我發現這個解決方案：

NSURLCredentialStorage *credentialStorage = [NSURLCredentialStorage sharedCredentialStorage];
    NSDictionary *credentialsDicationary = [credentialStorage allCredentials];


    for (NSURLProtectionSpace *space in [credentialsDicationary allKeys]) {

        NSDictionary *spaceDictionary = [credentialsDicationary objectForKey:space];

        for (id userName in [spaceDictionary allKeys]) {

            NSURLCredential *credential = [spaceDictionary objectForKey:userName];

            [credentialStorage removeCredential:credential forProtectionSpace:space];

        }

    }

從這里： 在請求時使用NSURLCredentialPersistenceForSession，然后在注銷時清除憑據仍然保留cerdentials

這是最好的方法嗎？ 我只存儲了1個憑證。 此代碼也在此行上給出了警告：

NSURLCredential *credential = [spaceDictionary objectForKey:userName];

這是警告......如何刪除此警告？

/Users/jsuske/Documents/SSiPad(Device Only)ios7/SchedulingiPadApplication/ViewControllers/LHLoginController.m:496:73: Local declaration of 'userName' hides instance variable

UPDATE

好的，我有3個方法：UserLogin，Login和LogoutButtonPressed

UserLogin：我正在使用AFNetworking使用NSURLCredential連接到Windows身份驗證的URL，如上所示：

-(void)UserLogin:(NSString *)user andPassWordExists:(NSString *)password completionHandler:(void (^)(NSArray *resultsObject, NSError *error))completionHandler
{

   NSURL *url = [NSURL URLWithString:kIP];
   NSURLRequest *request = [NSURLRequest requestWithURL:url];

    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc]
                                         initWithRequest:request];

    NSURLCredential *credential = [NSURLCredential
                                   credentialWithUser:user
                                   password:password
                                   persistence:NSURLCredentialPersistenceForSession];

    [operation setCredential:credential];


    [[NSOperationQueue mainQueue] addOperation:operation];

    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {

        if (completionHandler) {
            completionHandler(responseObject, nil);
        }

    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {

        if (completionHandler) {
            completionHandler(nil, error);
        }

    }];

    [operation start];

}

Login方法調用此方法：

- (void)Login
{
    NSString *rawString = [self.idTextField text];
    NSCharacterSet *whitespace = [NSCharacterSet whitespaceAndNewlineCharacterSet];
    [self.idTextField setText:[rawString stringByTrimmingCharactersInSet:whitespace]];


    [userName UserLogin:self.idTextField.text andPassWordExists:self.passwordTextField.text completionHandler:^(id responseObject, NSError *error) {
        if (responseObject) {

                [self.idTextField removeFromSuperview];
                [self.passwordTextField removeFromSuperview];
                [self.loginButton removeFromSuperview];
                self.idTextField = nil;
                self.passwordTextField = nil;
                //self.loginButton = nil;


                [self CreateMenu];



                [indicatorView stopAnimating];
                [indicatorView removeFromSuperview];
                indicatorView = nil;
                [loadingView removeFromSuperview];
                loadingView = nil;
        }else{


            [self CustomAlert:@"Sorry Login Failed, User and/or Passsword Incorrect"];

            [indicatorView stopAnimating];
            [indicatorView removeFromSuperview];
            indicatorView = nil;
            [loadingView removeFromSuperview];
            loadingView = nil;

        }
    }];

}

我正在嘗試使用LogoutButtonPressed清除我的會話：

- (void)LogoutButtonPressed
{

    //@TODO: Fix Logout

    NSDictionary *credentialsDict = [[NSURLCredentialStorage sharedCredentialStorage] allCredentials];

    if ([credentialsDict count] > 0) {
        NSEnumerator *protectionSpaceEnumerator = [credentialsDict keyEnumerator];
        id urlProtectionSpace;

        while (urlProtectionSpace = [protectionSpaceEnumerator nextObject]) {
            NSEnumerator *userNameEnumerator = [[credentialsDict objectForKey:urlProtectionSpace] keyEnumerator];
            id userNameCred;

            while (userNameCred = [userNameEnumerator nextObject]) {
                NSURLCredential *cred = [[credentialsDict objectForKey:urlProtectionSpace] objectForKey:userNameCred];
                NSLog(@"cred to be removed: %@", cred);
                [[NSURLCredentialStorage sharedCredentialStorage] removeCredential:cred forProtectionSpace:urlProtectionSpace];
            }
        }
    }
}

我從這個例子中得到了這個代碼： http ： //www.springenwerk.com/2008/11/i-am-currently-building-iphone.html

現在我的問題是，當我觸發注銷按鈕然后轉到觸發登錄方法沒有結果我仍然可以登錄，如果我注銷然后等待2 - 3分鍾並登錄沒有證書我無法登錄。 為什么它表現得這樣，它幾乎就像信用卡仍然保存。 請幫忙。

UPDATE

我試圖清除LogoutButtonPressed中的緩存，cookie和信用：

NSURLCache *sharedCache = [NSURLCache sharedURLCache];
[sharedCache removeAllCachedResponses];

NSHTTPCookieStorage *cookieStorage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
NSArray *cookies = [cookieStorage cookies];
id cookie;
for (cookie in cookies) {
    [cookieStorage deleteCookie:cookie];
}

NSDictionary *credentialsDict = [[NSURLCredentialStorage sharedCredentialStorage] allCredentials];
if ([credentialsDict count] > 0) {
    NSEnumerator *protectionSpaceEnumerator = [credentialsDict keyEnumerator];
    id urlProtectionSpace;
    while (urlProtectionSpace = [protectionSpaceEnumerator nextObject]) {
        NSEnumerator *userNameEnumerator = [[credentialsDict objectForKey:urlProtectionSpace] keyEnumerator];
        id userNameCreds;
        while (userNameCreds = [userNameEnumerator nextObject]) {
            NSURLCredential *cred = [[credentialsDict objectForKey:urlProtectionSpace] objectForKey:userNameCreds];
            [[NSURLCredentialStorage sharedCredentialStorage] removeCredential:cred forProtectionSpace:urlProtectionSpace];
        }
    }
}

它仍然無法正常工作。

Answer 1

通過在URL末尾添加一個隨機數，可以輕松解決此問題：

-(void)UserLogin:(NSString *)user andPassWordExists:(NSString *)password completionHandler:(void (^)(NSArray *resultsObject, NSError *error))completionHandler
{
   NSInteger randomNumber = arc4random() % 999;

   NSString *requestURL = [NSString stringWithFormat:@"%@?cache=%ld",kIP,(long)randomNumber];

   NSURL *url = [NSURL URLWithString:requestURL];

   NSURLRequest *request = [NSURLRequest requestWithURL:url];
     AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc]
                                         initWithRequest:request];

   NSURLCredential *credential = [NSURLCredential
                                   credentialWithUser:user
                                   password:password
                                   persistence:NSURLCredentialPersistenceForSession];


    [operation setCredential:credential];
    operation.responseSerializer = [AFJSONResponseSerializer serializer];
    [[NSOperationQueue mainQueue] addOperation:operation];


    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {

        if (completionHandler) {
            completionHandler(responseObject, nil);
        }

    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {

        if (completionHandler) {
            completionHandler(nil, error);
        }

    }];

    [operation start];

}

並確保在您呼叫的所有URL的末尾都有一個隨機數。

Answer 2

LogoutButtonPressed正在從NSURLCredentialStorage中刪除憑據，同時迭代相同的憑據 - NSEnumerator不支持該憑據。 您是否在日志中看到“要刪除的信息”消息？

您可以嘗試使用https://developer.apple.com/library/ios/samplecode/AdvancedURLConnections/Listings/CredentialsController_m.html中的_resetCredentials方法。

無論這是否有所不同，從resetCredentials調用之前和之后檢查_dumpCredentials的輸出都會很有趣 - 或者更好的是在登錄方法中執行轉儲，並查看重置后是否立即進行更改然后2-3分鍾后。

self.passwordTextField.text被清除了嗎？ 在它登錄的無憑證案例中， NSURLCredential credentialWithUser:給你零嗎？