Question

我正在尝试正确使用iOS Facebook-SDK，我尝试了Facebook的每一个样本，也尝试了网络上的内容，并且忘了我做错了什么。

我想要达到的目的是仅在提出请求时才要求获得Facebook许可。

目前唯一一个“工作”但没有遇到会话问题的解决方案是直接在应用启动时请求权限。那不是我想要的。

许多应用程序都使用了我想要的东西。也许是因为他们不使用系统facebook权限？他们去Safari并切换回来。感谢Anyhelp！

这是我的实际代码：

// ****************************************************************************
// App switching methods to support Facebook Single Sign-On.
// ****************************************************************************
- (BOOL)application:(UIApplication *)application
            openURL:(NSURL *)url
  sourceApplication:(NSString *)sourceApplication
         annotation:(id)annotation {

    // Facebook SDK * login flow *
    // Attempt to handle URLs to complete any auth (e.g., SSO) flow.
    return [FBAppCall handleOpenURL:url sourceApplication:sourceApplication fallbackHandler:^(FBAppCall *call) {
        // Facebook SDK * App Linking *
        // For simplicity, this sample will ignore the link if the session is already
        // open but a more advanced app could support features like user switching.
        if (call.accessTokenData) {
            if ([FBSession activeSession].isOpen) {
                NSLog(@"INFO: Ignoring app link because current session is open.");
            }
            else {
                [self handleAppLink:call.accessTokenData];
            }
        }
    }];
}

// Helper method to wrap logic for handling app links.
- (void)handleAppLink:(FBAccessTokenData *)appLinkToken {
    // Initialize a new blank session instance...
    //Open session
    NSArray *permissionsArray = @[ @"user_about_me", @"user_relationships", @"user_birthday", @"user_location"];
    FBSession *appLinkSession = [[FBSession alloc] initWithAppID:nil
                                                     permissions:permissionsArray
                                                 defaultAudience:FBSessionDefaultAudienceNone
                                                 urlSchemeSuffix:nil
                                              tokenCacheStrategy:[FBSessionTokenCachingStrategy nullCacheInstance] ];
    [FBSession setActiveSession:appLinkSession];
    // ... and open it from the App Link's Token.
    [appLinkSession openFromAccessTokenData:appLinkToken
                          completionHandler:^(FBSession *session, FBSessionState status, NSError *error) {
                              // Forward any errors to the FBLoginView delegate.
                              if (error) {
                                  NSLog(@"%@", error);
                              }
                          }];
}

- (void)applicationDidBecomeActive:(UIApplication *)application {
    /*
     Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
     */

    // Clear badge and update installation, required for auto-incrementing badges.
    if (application.applicationIconBadgeNumber != 0) {
        application.applicationIconBadgeNumber = 0;
        [[PFInstallation currentInstallation] saveInBackground];
    }

    // Clears out all notifications from Notification Center.
    [[UIApplication sharedApplication] cancelAllLocalNotifications];
    application.applicationIconBadgeNumber = 1;
    application.applicationIconBadgeNumber = 0;


    NSArray *permissionsArray = @[ @"user_about_me", @"user_relationships", @"user_birthday", @"user_location"];
    FBSession *appLinkSession = [[FBSession alloc] initWithPermissions:permissionsArray];
    [FBSession setActiveSession:appLinkSession];
    // ... and open it from the App Link's Token.
    [appLinkSession openWithBehavior:FBSessionLoginBehaviorUseSystemAccountIfPresent completionHandler:^(FBSession *session, FBSessionState status, NSError *error) {
        // Forward any errors to the FBLoginView delegate.
        if (error) {
            NSLog(@"%@", error);
        }
    }];
}

Answer 1

好的，这是我的代码：在成功块中做任何你喜欢的事。

+ (void)checkPublishPermission:(NSString*)permission success:(void(^)(void))successCallback fail:(void(^)(void))failCallback
{
    // Check for publish permissions
    [FBRequestConnection startWithGraphPath:@"/me/permissions"
                          completionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
                              if (!error){
                                  NSDictionary *permissions= [(NSArray *)[result data] objectAtIndex:0];
                                  if (![permissions objectForKey:permission]){
                                      // permission not found, ask for it
                                      [FBHelper requestPublishPermission:permission success:successCallback fail:failCallback];
                                  } else {
                                      // Publish permissions found, publish the OG story
                                      successCallback();
                                  }

                              } else {
                                  // There was an error, handle it
                                  // See https://developers.facebook.com/docs/ios/errors/
                                  NSLog(@"%@", [error debugDescription]);
                              }
                          }];
}

+ (void)requestPublishPermission:(NSString*)permission success:(void(^)(void))successCallback fail:(void(^)(void))failCallback
{
    // Request publish_actions
    [FBSession.activeSession requestNewPublishPermissions:[NSArray arrayWithObject:permission]
                                          defaultAudience:FBSessionDefaultAudienceFriends
                                        completionHandler:^(FBSession *session, NSError *error) {
                                            if (!error) {
                                                if ([FBSession.activeSession.permissions
                                                     indexOfObject:permission] == NSNotFound){
                                                    // Permission not granted, tell the user we will not publish
                                                    failCallback();
                                                } else {
                                                    // Permission granted, publish the OG story
                                                    successCallback();
                                                }

                                            } else {
                                                // There was an error, handle it
                                                // See https://developers.facebook.com/docs/ios/errors/
                                                NSLog(@"%@", [error localizedDescription]);
                                            }
                                        }];
}

仅在请求要处理时才打开FBSession

1 个答案: