使用 FBSDKCoreKit 4.22.1

我有一个公开安装的应用程序，在白天为多个用户提供服务。一个人可以走到 iPad 前并使用他们的 Facebook 帐户登录:

成功登录后，他们可以开始工作并使用该应用程序，稍后他们将注销:

注销成功。然后下一个用户使用公共(public) iPad 并单击 Facebook 登录按钮，但他们将看到:

FBSDKLoginManager 或其他 Facebook SDK Libs 已经记住了以前用户的 Facebook 登录的一些元素。

我想彻底清除有关之前用户的 Facebook 凭据的所有信息

成功注销后，将调用此 FBSDKLoginButtonDelegate 方法，我尝试了以下方法来完全删除 Facebook 帐户信息，但没有成功:

func loginButtonDidLogOut(_ loginButton: FBSDKLoginButton!) {
    print("\(#function) in \(#file.components(separatedBy: "/").last ?? "")")
    print("Todo, must completely remove Facebook Auth token info for current user logging out")
    FBSDKAccessToken.setCurrent(nil)
    FBSDKLoginManager().logOut()
    FBSDKProfile.setCurrent(nil)
}

因此，对于 FBSDKCoreKit 4.22.1，Safari 浏览器用于打开 Facebook 身份验证重定向 URL，并且 Javascript 使用本地存储:

有趣的是，阻止所有 Cookie，Apple 暗示这也会阻止网站数据 (localStorage)，但不会阻止本地存储和 Facebook，并且仍然会创建网站数据存储:

Apple 说 here :

“更改接受哪些 cookie 和网站数据:选择“Cookie 和网站数据”选项:”

• “始终阻止:Safari 不允许任何网站、第三方或 广告商会在您的 Mac 上存储 cookie 和其他数据。这可能 阻止某些网站正常运行。”

这就是我希望本地存储和 cookie 被阻止的地方，但 Facebook 仍然可以创建本地存储条目

最佳答案

我有一个类似的问题，我最终使用了 SDK 的 MODIFIED 版本，这实际上非常危险，因为其他开发人员可能不知道它被修改了..所以你需要留言..

问题:退出后，您仍然处于登录状态(在 Safari 中)..但前提是您使用 native 登录或系统登录，并且无法从应用程序本身退出 Safari.. super 烦人(您也无法从应用内清除 Safari 的 cookie 或数据)。

解决方案:

如果您查看 SDK 的文档，它会显示:

// Copyright (c) 2014-present, Facebook, Inc. All rights reserved.
//
// You are hereby granted a non-exclusive, worldwide, royalty-free license to use,
// copy, modify, and distribute this software in source code or binary form for use
// in connection with the web services and APIs provided by Facebook.
//
// As with any software that integrates with the Facebook platform, your use of
// this software is subject to the Facebook Developer Principles and Policies
// [http://developers.facebook.com/policy/]. This copyright notice shall be
// included in all copies or substantial portions of the software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.




typedef NS_ENUM(NSUInteger, FBSDKLoginBehavior)
{
  /*!
   @abstract This is the default behavior, and indicates logging in through the native
   Facebook app may be used. The SDK may still use Safari instead.
   */
  FBSDKLoginBehaviorNative = 0,
  /*!
   @abstract Attempts log in through the Safari or SFSafariViewController, if available.
   */
  FBSDKLoginBehaviorBrowser,
  /*!
   @abstract Attempts log in through the Facebook account currently signed in through
   the device Settings.
   @note If the account is not available to the app (either not configured by user or
   as determined by the SDK) this behavior falls back to \c FBSDKLoginBehaviorNative.
   */
  FBSDKLoginBehaviorSystemAccount,
  /*!
   @abstract Attemps log in through a modal \c UIWebView pop up

   @note This behavior is only available to certain types of apps. Please check the Facebook
   Platform Policy to verify your app meets the restrictions.
   */
  FBSDKLoginBehaviorWeb,
};

因此，如果您使用 Native 但它不能，它将回退到 Safari。如果您使用系统但它不能，它会回退到 native ，而 native 又会回退到 Safari..

然后是 FBSDKLoginBehaviorWeb，它使用模态 WebView /弹出窗口!因此，如果您不是绝对必须使用 native 或系统登录，那么我建议您选择此选项，因为它不会回退到 Safari。

否则: 这是我所做的更改，因此它从不在后台使用 Safari:

FBLoginSDKManager.m:

- (void)logInWithBehavior:(FBSDKLoginBehavior)loginBehavior
{
  NSDictionary *loginParams = [self logInParametersWithPermissions:_requestedPermissions];

  void(^completion)(BOOL, NSString *, NSError *) = ^void(BOOL didPerformLogIn, NSString *authMethod, NSError *error) {
    if (didPerformLogIn) {
      [_logger startAuthMethod:authMethod];
      _performingLogIn = YES;
    } else {
      if (!error) {
        error = [NSError errorWithDomain:FBSDKLoginErrorDomain code:FBSDKLoginUnknownErrorCode userInfo:nil];
      }
      [self invokeHandler:nil error:error];
    }
  };

  switch (loginBehavior) {
    case FBSDKLoginBehaviorNative: {
      if ([FBSDKInternalUtility isFacebookAppInstalled]) {
        [FBSDKServerConfigurationManager loadServerConfigurationWithCompletionBlock:^(FBSDKServerConfiguration *serverConfiguration, NSError *loadError) {
          BOOL useNativeDialog = [serverConfiguration useNativeDialogForDialogName:FBSDKDialogConfigurationNameLogin];
          if (useNativeDialog && loadError == nil) {
            [self performNativeLogInWithParameters:loginParams handler:^(BOOL openedURL, NSError *openedURLError) {
              if (openedURLError) {
                [FBSDKLogger singleShotLogEntry:FBSDKLoggingBehaviorDeveloperErrors
                                   formatString:@"FBSDKLoginBehaviorNative failed : %@\nTrying FBSDKLoginBehaviorBrowser", openedURLError];
              }
              if (openedURL) {
                completion(YES, FBSDKLoginManagerLoggerAuthMethod_Native, openedURLError);
              } else {
                [self logInWithBehavior:FBSDKLoginBehaviorWeb];  //-- CHANGED BY BRANDON T.
              }
            }];
          } else {
            [self logInWithBehavior:FBSDKLoginBehaviorWeb];  //-- CHANGED BY BRANDON T.
          }
        }];
        break;
      }
        // intentional fall through.  -- CHANGED BY BRANDON T.
        [self logInWithBehavior:FBSDKLoginBehaviorWeb];  //-- CHANGED BY BRANDON T.
        break;
    }
    case FBSDKLoginBehaviorBrowser: {
      [self performBrowserLogInWithParameters:loginParams handler:^(BOOL openedURL,
                                                                    NSString *authMethod,
                                                                    NSError *openedURLError) {
        if (openedURL) {
          completion(YES, authMethod, openedURLError);
        } else {
          completion(NO, authMethod, openedURLError);
        }
      }];
      break;
    }
    case FBSDKLoginBehaviorSystemAccount: {
      [FBSDKServerConfigurationManager loadServerConfigurationWithCompletionBlock:^(FBSDKServerConfiguration *serverConfiguration, NSError *loadError) {
        if (serverConfiguration.isSystemAuthenticationEnabled && loadError == nil) {
          [self beginSystemLogIn];
        } else {
          [self logInWithBehavior:FBSDKLoginBehaviorNative];
        }
      }];
      completion(YES, FBSDKLoginManagerLoggerAuthMethod_System, nil);
      break;
    }
    case FBSDKLoginBehaviorWeb:
      [self performWebLogInWithParameters:loginParams handler:^(BOOL openedURL, NSError *openedURLError) {
        completion(openedURL, FBSDKLoginManagerLoggerAuthMethod_Webview, openedURLError);
      }];
      break;
  }
}

这使得所有 native 登录或系统登录都将回退到应用程序内模态 UIWebView。然后你可以在注销时清除cookie，你会没事的。删除所有NSHTTPCookieStorage.sharedHTTPCookieStorage().cookies和NSURLCache.sharedURLCache().removeAllCachedResponses() 注销后。

显然最安全的选择是永远不要使用系统或 native 登录，而是始终使用:FBSDKLoginBehaviorWeb..

关于ios - 如何在iOS App中完全注销Facebook SDK Auth，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/44092175/