iphone - 如何在 Facebook 上分享帖子时解决登录问题

Question

我想在 facebook 上分享一个帖子，当我使用 iOS 6 时它可以正常工作，但在 iOS 5 和 iOS 5.1 中，它会出现登录问题，当我登录并转到已经授权的页面并按 OK 按钮时，它会将我拉回登录，就像这并在这两页上一次又一次地重复

当我按下确定时，它会回馈

 case 1: // facebook
        {
            if(NSClassFromString(@"SLComposeViewController"))
            {
                SLComposeViewController *fbController = [SLComposeViewController composeViewControllerForServiceType:SLServiceTypeFacebook];
                SLComposeViewControllerCompletionHandler __block completionHandler=^(SLComposeViewControllerResult result){

                    [fbController dismissViewControllerAnimated:YES completion:nil];

                    switch(result){
                        case SLComposeViewControllerResultCancelled:
                        default:
                        {
                            NSLog(@"Cancelled.....");

                        }
                            break;
                        case SLComposeViewControllerResultDone:
                        {
                            ALERT_VIEW(@"Successfully posted to facebook.");
                        }
                            break;
                    }};

                [fbController setInitialText:quotesss];
                [fbController setCompletionHandler:completionHandler];
                [self presentViewController:fbController animated:YES completion:nil];
            }
            else
            {
                DEFacebookComposeViewControllerCompletionHandler completionHandler = ^(DEFacebookComposeViewControllerResult result) {
                    switch (result) {
                        case DEFacebookComposeViewControllerResultCancelled:
                            NSLog(@"Facebook Result: Cancelled");
                            break;
                        case DEFacebookComposeViewControllerResultDone:
                            ALERT_VIEW(@"Successfully posted to facebook.");
                            break;
                    }

                    [self dismissViewControllerAnimated:YES completion:nil];
                };
                DEFacebookComposeViewController *facebookViewComposer = [[DEFacebookComposeViewController alloc] init];
                self.modalPresentationStyle = UIModalPresentationCurrentContext;

                [facebookViewComposer setInitialText:quotesss];

                facebookViewComposer.completionHandler = completionHandler;
                [self presentViewController:facebookViewComposer animated:YES completion:nil];
                [facebookViewComposer release];
            }
            break;
        }
        case 2: // twitter
        {
            NSString *text = [NSString stringWithFormat:@"%@", quotesss ];
            if([text length] > 135)
            {
                text = [NSString stringWithFormat:@"%@%@", quotesss ,@"..."];
                text = [text substringToIndex:135];

            }

            if(NSClassFromString(@"SLComposeViewController"))
            {
                SLComposeViewController *twitterController = [SLComposeViewController composeViewControllerForServiceType:SLServiceTypeTwitter];
                SLComposeViewControllerCompletionHandler __block completionHandler=^(SLComposeViewControllerResult result){

                    [twitterController dismissViewControllerAnimated:YES completion:nil];

                    switch(result){
                        case SLComposeViewControllerResultCancelled:
                        default:
                        {
                            NSLog(@"Cancelled.....");

                        }
                            break;
                        case SLComposeViewControllerResultDone:
                        {
                            ALERT_VIEW(@"Successfully posted to twitter.");
                        }
                            break;
                      }};

                [twitterController setInitialText:text];
                [twitterController setCompletionHandler:completionHandler];
                [self presentViewController:twitterController animated:YES completion:nil];
            }

            else
            {
                DETweetComposeViewControllerCompletionHandler completionHandler = ^(DETweetComposeViewControllerResult result) {
                    switch (result) {
                        case DETweetComposeViewControllerResultCancelled:
                            NSLog(@"Twitter Result: Cancelled");
                            break;
                        case DETweetComposeViewControllerResultDone:

                            ALERT_VIEW(@"Successfully posted to twitter.");
                            break;
                    }
                    [self dismissViewControllerAnimated:YES completion:nil];
                 };

                DETweetComposeViewController *tcvc = [[[DETweetComposeViewController alloc] init] autorelease];
                self.modalPresentationStyle = UIModalPresentationCurrentContext;
                [tcvc setInitialText:quotesss];
                tcvc.completionHandler = completionHandler;

                [self presentViewController:tcvc animated:YES completion:nil];

            }

            break;
        }

Answer 1

从您的代码中，我发现问题出在此代码中，因为 iOS 5 中的 Facebook 在 SLCompose 中不可用，只有 Twitter 可用，因此您的 FaceBook 由 DEFaceBook 处理

            DEFacebookComposeViewControllerCompletionHandler completionHandler = ^(DEFacebookComposeViewControllerResult result) {
                switch (result) {
                    case DEFacebookComposeViewControllerResultCancelled:
                        NSLog(@"Facebook Result: Cancelled");
                        break;
                    case DEFacebookComposeViewControllerResultDone:
                        ALERT_VIEW(@"Successfully posted to facebook.");
                        break;
                }

                [self dismissViewControllerAnimated:YES completion:nil];
            };
            DEFacebookComposeViewController *facebookViewComposer = [[DEFacebookComposeViewController alloc] init];
            self.modalPresentationStyle = UIModalPresentationCurrentContext;

            [facebookViewComposer setInitialText:quotesss];

            facebookViewComposer.completionHandler = completionHandler;
            [self presentViewController:facebookViewComposer animated:YES completion:nil];
            [facebookViewComposer release];
        }

所以去你的appdelegate并检查这个方法是否有一个有效的令牌（url包含你的应用程序，令牌格式是applicationURLSchema://"token"）检查它是否在这个方法中如果有必要保持断点并通过FBSession类然后handleOpenURL方法并找到错误发生的位置

 - (BOOL)application:(UIApplication *)application  openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication
 annotation:(id)annotation {

 // attempt to extract a token from the url
 return [FBSession.activeSession handleOpenURL:url];
 }