Question

如何加载Facebook网址（例如Facebook Mobile）作为已经过身份验证的用户？

使用Facebook SDK并已使用SSO登录，当我尝试在UIwebView中加载facebook URL时，我得到一个“你必须先登录”..我猜是因为来自实际Safari的不同cookie浏览器。

Answer 1

似乎不可能，因为您已在该特定应用程序的UIWebView中登录到FB，但它未在所有将来的会话中保存凭据，因此，它仅使用一次，然后下次重新分配UIWEBVIEW时相同的应用程序，以前的所有会话都已消失，您必须验证用户访问Facebook个人资料。

Answer 2

首先，您需要在身份验证期间更改下面的行为。

[FBSession setActiveSession：sess]; [sess openWithBehavior：（FBSessionLoginBehaviorForcingWebView）completionHandler：^（FBSession session，FBSessionState state，NSError error） {}];

它肯定会起作用。

Answer 3

//首先，您需要使用图形api对Facebook进行身份验证，例如下面的内容。 set authentication总是使用＆＃34; FBSessionLoginBehaviorForcingWebView＆＃34;

- (IBAction)clkFacebook:(id)sender {
    if (![SmashboardAPI hasInternetConnection]) {
        [AppDelegate showAlert:@"Error" message:@"Please check your internet connection."];
    } else {
        //[self disabledAllSocialButtons];
        [self showSpinner];
        // If the session state is any of the two "open" states when the button is clicked
        if (FBSession.activeSession.state == FBSessionStateOpen
            || FBSession.activeSession.state == FBSessionStateOpenTokenExtended) {

            // Close the session and remove the access token from the cache
            // The session state handler (in the app delegate) will be called automatically
            // If the session state is not any of the two "open" states when the button is clicked
        }
        else
        {

            FBSession* sess = [[FBSession alloc] initWithPermissions:[NSArray arrayWithObjects:@"public_profile",@"user_friends",@"email",nil]];

            [FBSession setActiveSession:sess];
            [sess openWithBehavior:(FBSessionLoginBehaviorForcingWebView) completionHandler:^(FBSession *session, FBSessionState state, NSError *error)
             {
                 [appDel sessionStateChanged:session state:state error:error];

                 [self showSpinner];
                 [self getLoggedFBUserDetails];
             }];
        }
    }
}

//然后在Appdelegate.m中使用此方法，以便您可以从应用程序的任何位置进行访问。

- (void)sessionStateChanged:(FBSession *)session state:(FBSessionState) state error:(NSError *)error
{
    // If the session was opened successfully
    if (!error && state == FBSessionStateOpen){
        // NSLog(@"Session opened");
        // Show the user the logged-in UI
        self.fbSession = FBSession.activeSession;
        //[self userLoggedIn];
        return;
    }
    if (state == FBSessionStateClosed || state == FBSessionStateClosedLoginFailed) {
        // If the session is closed
        // NSLog(@"Session closed");
        // Show the user the logged-out UI
        [self userLoggedOut];
        return;
    }

    // Handle errors
    if (error){
        // NSLog(@"Error");
        NSString *alertText;
        NSString *alertTitle;
        // If the error requires people using an app to make an action outside of the app in order to recover
        if ([FBErrorUtility shouldNotifyUserForError:error] == YES){
            alertTitle = @"Something went wrong";
            alertText = [FBErrorUtility userMessageForError:error];
            [self showMessage:alertText withTitle:alertTitle];
        } else {

            // If the user cancelled login, do nothing
            if ([FBErrorUtility errorCategoryForError:error] == FBErrorCategoryUserCancelled) {
                //  NSLog(@"User cancelled login");

                // Handle session closures that happen outside of the app
            } else if ([FBErrorUtility errorCategoryForError:error] == FBErrorCategoryAuthenticationReopenSession){
                alertTitle = @"Session Error";
                alertText = @"Your current session is no longer valid. Please log in again.";
                [self showMessage:alertText withTitle:alertTitle];

                // For simplicity, here we just show a generic message for all other errors
                // You can learn how to handle other errors using our guide: https://developers.facebook.com/docs/ios/errors
            } else {
                //Get more error information from the error
                NSDictionary *errorInformation = [[[error.userInfo objectForKey:@"com.facebook.sdk:ParsedJSONResponseKey"] objectForKey:@"body"] objectForKey:@"error"];

                // Show the user an error message
                alertTitle = @"Something went wrong";
                alertText = [NSString stringWithFormat:@"Please retry. \n\n If the problem persists contact us and mention this error code: %@", [errorInformation objectForKey:@"message"]];
                [self showMessage:alertText withTitle:alertTitle];
            }
        }
        // Clear this token
        [FBSession.activeSession closeAndClearTokenInformation];
        // Show the user the logged-out UI
        //[self userLoggedOut];
    }
}

//获取用户详细信息使用此方法：

- (void)getLoggedFBUserDetails
{
    if (FBSession.activeSession.state == FBSessionStateOpen
        || FBSession.activeSession.state == FBSessionStateOpenTokenExtended) {

        //use this active session
        [FBRequestConnection startForMeWithCompletionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
            if (!error) {
                NSLog([NSString stringWithFormat:@"user info: %@", result]);

            } else {
                // Check out our error handling guide: https://developers.facebook.com/docs/ios/errors/
                    [AppDelegate showAlert:@"Facebook internal error" message:[NSString stringWithFormat:@"Description:%@",[error localizedDescription]]];
                    [self hideSpinner];
            }
        }];
    }
}

//在UIWebview中加载时间轴使用下面的方法：

- (void)loadFacebookTimeline {
    NSString *strUrl = [NSString stringWithFormat:@"https://www.facebook.com/profile.php?id=%@",facebookUserId];
    NSURLRequest *requestObj = [NSURLRequest requestWithURL:[NSURL URLWithString:strUrl]];
    // Load URL in UIWebView
    [webview loadRequest:requestObj];
}

如何在UIWebView中访问公共Facebook个人资料

3 个答案: