Facebook SDK 3.1 iOS:如果用户从Facebook设置中删除应用程序,则处理登录

Question

我想在我的应用程序中加入一些Facebook集成.在这一点上,我已经设法登录,发布到朋友的墙上,检索朋友列表等等.除了一件事,一切都还好......

如果用户从您的Facebook设置/应用程序中删除应用程序 ,然后进入iOS应用程序,则代码无法识别Facebook应用程序已从用户设置中删除并假设已登录(这是问题,因为如果用户试图发布到朋友的墙上,应用程序什么都不做).

然后,用户关闭iOS应用程序并重新启动它...通过此重新启动,iOS应用程序"已修复"并检测到用户不再登录.

在用户从设置中删除Facebook应用程序之后,我无法立即检测到该时刻,以便将登录流程带给用户...

这是我的代码:

在我的应用程序的第一个场景......

if([FBSession activeSession].state == FBSessionStateCreatedTokenLoaded)
{
    NSLog(@"Logged in to Facebook");
    [self openFacebookSession];
    UIAlertView *alertDialog;

    alertDialog = [[UIAlertView alloc] initWithTitle:@"Facebook" message:@"You're already logged in to Facebook" delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];

    [alertDialog show];

    [alertDialog release];
    return YES;
}
else{
    NSLog(@"Not logged in to Facebook"); //Show the login flow
    return NO;
}

这是openFacebookSession的代码

-(void)openFacebookSession
{
    NSArray *permissions = [[NSArray alloc] initWithObjects:
                            @"publish_stream",
                            nil];

    [FBSession openActiveSessionWithPublishPermissions:permissions defaultAudience:FBSessionDefaultAudienceFriends allowLoginUI:YES completionHandler:^(FBSession *session, FBSessionState status, NSError *error) {
        [self sessionStateChanged:session state:status error:error];
    }];
}

sessionStateChanged的代码......

-(void)sessionStateChanged:(FBSession *)session state:(FBSessionState)state error:(NSError *)error
{
    switch (state) {
        case FBSessionStateOpen: {
            NSLog(@"Session opened");
        }
            break;
        case FBSessionStateClosed:
        case FBSessionStateClosedLoginFailed:
            [FBSession.activeSession closeAndClearTokenInformation];
            break;
        default:
            break;
    }

    if (error) {
        UIAlertView *alertView = [[UIAlertView alloc]
                                  initWithTitle:@"Error"
                                  message:error.localizedDescription
                                  delegate:nil
                                  cancelButtonTitle:@"OK"
                                  otherButtonTitles:nil];
        [alertView show];
    }
}

非常感谢你!

Answer 1

我发现这也发生在我自己身上......当用户更改了他们的Facebook密码时发现了,我们无法再进行身份验证.手动重新同步/清除帐户会话允许他们再次登录.

-(void)syncFacebookAccount
 {
    [self forceLogout];
    ACAccountStore *accountStore = [[ACAccountStore alloc] init];
    ACAccountType *accountTypeFB = [accountStore         accountTypeWithAccountTypeIdentifier:@"com.apple.facebook"];
    if (accountStore && accountTypeFB) {
    NSArray *fbAccounts = [accountStore accountsWithAccountType:accountTypeFB];
    id account;
    if (fbAccounts && [fbAccounts count] > 0 && (account = [fbAccounts objectAtIndex:0])) {
    [accountStore renewCredentialsForAccount:account completion:^(ACAccountCredentialRenewResult renewResult, NSError *error) {
                    // Not actually using the completion handler...
    }];
            }
        }
    }

Answer 2

我有同样的问题，并且在 Facebook SDK 网站上找不到有关错误代码的正确文档。

我通过比较[error code];或[error userInfo];值解决了问题。

您的会话将具有状态FBSessionStateClosedLoginFailed，错误的 userInfo 字典将具有以下形式

"com.facebook.sdk:ErrorLoginFailedReason" = "com.facebook.sdk:ErrorLoginFailedReason";

另一方面，错误代码向我显示，2以便您可以在 sessionStateChanged::: 函数结束时处理它

- (void)sessionStateChanged:(FBSession *)session
                  state:(FBSessionState)state
                  error:(NSError *)error {
switch (state) {
    case FBSessionStateOpen: {
        //update permissionsArrat
        [self retrieveUSerPermissions];

        if (!needstoReopenOldSession) {
            //First User information
            [self getUserInformation:nil];
        }

        NSNotification *authorizationNotification = [NSNotification notificationWithName:facebookAuthorizationNotification object:nil];
        [[NSNotificationCenter defaultCenter] postNotification:authorizationNotification];

    }
    case FBSessionStateClosed: {
        break;
    }
    case FBSessionStateClosedLoginFailed: {
        [FBSession.activeSession closeAndClearTokenInformation];
        break;
    }
    default:
        break;
}

if (error) 
{
    NSNotification *authorizationNotification = [NSNotification  notificationWithName:faceBookErrorOccuredNotification object:error];
    [[NSNotificationCenter defaultCenter] postNotification:authorizationNotification];
}
}