如果我们从设置中有 Facebook 会话，FBLoginView 不会发出警报

Posted 2023-03-16

【中文标题】如果我们从设置中有 Facebook 会话，FBLoginView 不会发出警报

【英文标题】：FBLoginView not giving alert if we have Facebook session from settings

【发布时间】：2013-08-12 13:18:32

【问题描述】：

如果我在 Safari 中没有 Facebook 会话或设备上的 Facebook 本机应用程序中没有 Facebook 会话，我正在使用 FBLoginView，此 FBLoginView 不采用 Facebook 会话表单设置

【参考方案1】：

使用对我来说工作正常：

 -(void)LinkeToFaceBook:(NSString *)stringRequest

        if ([HostSite checkServerConnected :kNetworkSuccess withFailureNote:kNetworkFailure])
        
            if (!FBSession.activeSession.isOpen) 
                [FBSession.activeSession closeAndClearTokenInformation];
                FBSession.activeSession=nil;
                [self openFacebookAuthentication];
            
         else 
            [self networkAlertShow];

        

    

    -(void)openFacebookAuthentication
    
        NSArray *permission = [NSArray arrayWithObjects:kFBEmailPermission,kFBUserPhotosPermission,kFBUserPublicPermission,kFBUserLikePermission, nil];

        FBSession *session = [[FBSession alloc] initWithPermissions:permission];

        [FBSession setActiveSession: [[FBSession alloc] initWithPermissions:permission] ];

        [[FBSession activeSession] openWithBehavior:FBSessionLoginBehaviorForcingWebView completionHandler:^(FBSession *session, FBSessionState status, NSError *error) 

            switch (status) 
                case FBSessionStateOpen:
                    [self likeFaceBook];
                    break;
                case FBSessionStateClosedLoginFailed: 
                    // prefer to keep decls near to their use
                    // unpack the error code and reason in order to compute cancel bool
                    NSString *errorCode = [[error userInfo] objectForKey:FBErrorLoginFailedOriginalErrorCode];
                    NSString *errorReason = [[error userInfo] objectForKey:FBErrorLoginFailedReason];
                    BOOL userDidCancel = !errorCode && (!errorReason || [errorReason isEqualToString:FBErrorLoginFailedReasonInlineCancelledValue]);
                    if(error.code == 2) 
                        UIAlertView *errorMessage = [[UIAlertView alloc] initWithTitle:kFBAlertTitle
                                                                               message:kFBAuthenticationErrorMessage
                                                                              delegate:nil
                                                                     cancelButtonTitle:kOk
                                                                     otherButtonTitles:nil];
                        [errorMessage performSelectorOnMainThread:@selector(show) withObject:nil waitUntilDone:YES];
                        errorMessage = nil;
                    
                
                    break;
                    // presently extension, log-out and invalidation are being implemented in the Facebook class
                default:
                    break; // so we do nothing in response to those state transitions
            
        ];
        permission = nil;
    

【讨论】：

我想在屏幕截图中显示警报我已经添加了 FBLoginView 类和 FB 登录视图的所有委托方法。