如何在UIWebView中訪問公開的Facebook個人資料

Question

如何將Facebook網址（如Facebook Mobile）加載爲已認證的用戶？

使用Facebook SDK並已登錄到SSO，當我嘗試在UIwebView中加載Facebook URL時，我得到一個「您必須先登錄」..我猜是因爲來自實際的不同cookie Safari瀏覽器。

Answer 1

//首先，您需要使用圖表api進行身份驗證，例如下圖。一套身份驗證始終使用「FBSessionLoginBehaviorForcingWebView」

- (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]; 
      }]; 
     } 
    } 
} 

//然後在Appdelegate.m使用此方法的話，你可以在應用程序的任何地方訪問。

- (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]; 
    } 
} 

//獲取用戶詳細信息用戶這個方法：

- (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]; 
      } 
     }]; 
    } 
} 

//對於一個UIWebView使用的裝載時間線下面的方法：

- (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]; 
} 

Answer 2

看來這是不可能的，因爲您已經在該特定應用程序的UIWebView中登錄到FB，但它不會在將來的所有會話中保存憑據，因此，它只使用一次，然後下次重新分配UIWEBVIEW相同的應用程序，所有以前的會話都不見了，你必須認證用戶才能訪問Facebook Profile。

Answer 3

首先，您需要在認證過程中將行爲更改爲下方。

[FBSession setActiveSession：sess]; （FBSessionLoginBehaviorForcingWebView）completionHandler：^（FBSession會話，FBSessionState狀態，NSError錯誤） {}];

它肯定會工作。