presentShareDialog 返回 nil 的原因是啥？

Posted 2023-03-17

【中文标题】presentShareDialog 返回 nil 的原因是啥？

【英文标题】：What are the reasons that presentShareDialog returns nil?presentShareDialog 返回 nil 的原因是什么？

【发布时间】：2013-06-12 12:48:18

【问题描述】：

我试图让用户发布一个简单的 Facebook 状态更新，而不使用 OpenGraph。到目前为止，允许用户登录并请求publish_actions 权限，一切顺利。

但是，当我尝试调用 presentShareDialogWithLink:name:caption:description:picture:clientState:handler: 时，它总是返回 nil 并且什么也不显示。它甚至似乎都没有调用处理程序，这使得它不知道为什么它不起作用。

这可能失败的原因是什么？如果我知道可能是什么原因，我总是可以原路返回。

相关代码

用户按下按钮

AppDelegate_Pad *appDelegate = (AppDelegate_Pad *)[[UIApplication sharedApplication] delegate];
if(FBSession.activeSession.isOpen) 
    [appDelegate postFacebookUpdateWithAlbum:album];
 else 
    // The person using the app has initiated a login, so call the openSession method
    // and show the login UX if necessary.
    [appDelegate openSessionWithAllowLoginUI:YES album:album];

App Delegate 中的 Facebook 代码

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

    if ([FBSession.activeSession handleOpenURL:url]) 
        [self postFacebookUpdateWithAlbum:self.facebookAlbum];
        self.facebookAlbum = nil;
        return  YES;
    


#pragma mark Facebook

    /*
     * Opens a Facebook session and optionally shows the login UX.
     */
    - (BOOL)openSessionWithAllowLoginUI:(BOOL)allowLoginUI album:(LPAlbum *)album 
        self.facebookAlbum = album;

        return [FBSession openActiveSessionWithPublishPermissions:@[@"publish_actions"] defaultAudience:FBSessionDefaultAudienceFriends allowLoginUI:allowLoginUI completionHandler:^(FBSession *session, FBSessionState status, NSError *error) 
            [self sessionStateChanged:session
                                state:status
                                error:error];

        ];
    

    - (void)postFacebookUpdateWithAlbum:(LPAlbum *)album 
        if (album) 
            // we defer request for permission to post to the moment of post, then we check for the permission
            if ([FBSession.activeSession.permissions indexOfObject:@"publish_actions"] == NSNotFound) 
                // if we don't already have the permission, then we request it now
                [FBSession.activeSession requestNewPublishPermissions:@[@"publish_actions"]
                                                      defaultAudience:FBSessionDefaultAudienceFriends
                                                    completionHandler:^(FBSession *session, NSError *error) 
                                                        if (!error) 
                                                            [self doPostWithAlbum:album];
                                                        
                                                        else 
                                                            DLog(@"Could not get permissions. Error: %@", error);
                                                        
                                                    ];
             else 
                [self doPostWithAlbum:album];
            
        
    

    - (void)doPostWithAlbum:(LPAlbum *)album 
        NSString *initialText = [NSString stringWithFormat:@"Neat status update"];
        NSURL *coverImageURL = [NSURL URLWithString:album.imageBaseURLString];
        UIImage *coverImage = [UIImage imageWithContentsOfFile:album.imageBaseURLString];
        NSURL *infoLinkURL = [NSURL URLWithString:album.infoSiteURLString];

        // First, try the ios 6 native sharing.
        BOOL iOS6native = [FBDialogs presentOSIntegratedShareDialogModallyFrom:self.window.rootViewController initialText:initialText image:coverImage url:infoLinkURL handler:^(FBOSIntegratedShareDialogResult result, NSError *error) 
        ];

        if (!iOS6native) 
            NSString *name = @"name";
            NSString *caption = @"caption";
            NSString *description = @"description";

            FBShareDialogParams *params = [[FBShareDialogParams alloc] init];
            params.link = infoLinkURL;
            params.name = name;
            params.description = description;

            BOOL canPresent = [FBDialogs canPresentShareDialogWithParams:params]; // returns NO
            DLog(@"Can present with params? %@", canPresent ? @"Yes" : @"No");
            canPresent = [FBDialogs canPresentOSIntegratedShareDialogWithSession:[FBSession activeSession]]; // returns NO
            DLog(@"Can present with session? %@", canPresent ? @"Yes" : @"No");

            FBAppCall *appCall = [FBDialogs presentShareDialogWithLink:infoLinkURL
                                                                  name:name
                                                               caption:caption
                                                           description:description
                                                               picture:coverImageURL
                                                           clientState:nil
                                                               handler:^(FBAppCall *call, NSDictionary *results, NSError *error) 
                                                                   if (error) 
                                                                       DLog(@"Error: %@", error.description);
                                                                    else 
                                                                       DLog(@"Success!");
                                                                   
                                                               ];
            if (!appCall) 
                // App call failed.
            
        
    

    // Convenience method to perform some action that requires the "publish_actions" permissions.
    - (void) performPublishAction:(void (^)(void)) action 
        // we defer request for permission to post to the moment of post, then we check for the permission
        if ([FBSession.activeSession.permissions indexOfObject:@"publish_actions"] == NSNotFound) 
            // if we don't already have the permission, then we request it now
            [FBSession.activeSession requestNewPublishPermissions:@[@"publish_actions"]
                                                  defaultAudience:FBSessionDefaultAudienceFriends
                                                completionHandler:^(FBSession *session, NSError *error) 
                                                    if (!error) 
                                                        action();
                                                    
                                                    //For this example, ignore errors (such as if user cancels).
                                                ];
         else 
            action();
        

    

【问题讨论】：

如果您没有正确版本的 Facebook 应用程序，它将返回 nil。你是在模拟器上得到这个吗？遗憾的是，您只能在设备上使用应用商店中最新的 Facebook 应用测试此功能。

等等，你真的需要 Facebook 应用程序吗？我的印象是共享对话框是本机系统对话框的替代品，仅在 iOS 6 及更高版本中可用。

【参考方案1】：

presentShareDialogWithLink 需要 Facebook 应用程序（记录在 here，并说“在 Facebook 应用程序中显示对话框......”）。

如果您想使用 iOS6 系统对话框，您需要使用 presentOSIntegratedShareDialogModallyFrom 方法之一，例如 this one。

【讨论】：

谢谢，我完全误解了“在 Facebook 应用程序中”。我以为它指的是你目前正在制作的应用，因为他们也称它为 Facebook 应用。

啊，我可以看出混乱了。