Using App Links Hosting API for link shared on Facebook from iOS app

Question

I\'ve honestly spent hours on this trying to get it to work. Unfortunately Facebook & App Link\'s documentation is not clear enough. Even the App Links video from F8.

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Answer 1

With the help of MingLi from FB I managed to get it working with the following code:

- (void)shareToOpenGraphCountdownInvite
{
    NSURL *url = [NSURL URLWithString:@"https://graph.facebook.com/oauth/access_token?grant_type=client_credentials&client_id={insert your FB app ID here}&client_secret={insert client secret here}"];
    NSString *fullToken = [NSString stringWithContentsOfURL:url encoding:NSUTF8StringEncoding error:nil];
    NSArray *components = [fullToken componentsSeparatedByString:@"="];
    FBAppAccessToken = [components objectAtIndex:1];

    NSDictionary *paramsForAppLinksHost = [NSDictionary dictionaryWithObjectsAndKeys:
                                           FBAppAccessToken, @"access_token",
                                           @"{your app name}", @"name",
                                           @"{your app's custom url}", @"al:ios:url",
                                           @"{app store ID}", @"al:ios:app_store_id",
                                           @"{your app name}", @"al:ios:app_name",
                                           @"{\"should_fallback\": false}", @"web",
                                           nil
                                           ];

    [FBRequestConnection startWithGraphPath:@"/{FB app ID}/app_link_hosts"
                                 parameters:paramsForAppLinksHost
                                 HTTPMethod:@"POST"
                          completionHandler:^(
                                              FBRequestConnection *connection,
                                              id result,
                                              NSError *error
                                              ) {
                              AppLinksHostURL_ID = [result objectForKey:@"id"]; // store this ID in an NSString
                              [self postOGStoryWithCustomURL];
                              if(error) NSLog(@"error = %@", error.description);

                          }];
}

- (void)postOGStoryWithCustomURL
{
    NSString *urlString = [NSString stringWithFormat:@"https://fb.me/%@/%@", AppLinksHostURL_ID, customURL];

    UIImage *image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[self pathForS3ObjectWithFilename:previewImageFilename]]]];

    // Create OG object
    id object =
    [FBGraphObject openGraphObjectForPostWithType:@"timeflyz:countdown_invite"
                                            title:eventBeingShared.eventName
                                            image:image
                                              url:urlString // fb.me app links hosted url here
                                      description:@"{insert description here}"];

    // Create an action
    id action = (id)[FBGraphObject graphObject];

    // Link the object to the action
    [action setObject:object forKey:@"countdown_invite"];

    // Check if the Facebook app is installed and we can present the share dialog
    FBOpenGraphActionParams *params = [[FBOpenGraphActionParams alloc] init];
    params.action = action;
    params.actionType = @"timeflyz:create";

    // If the Facebook app is installed and we can present the share dialog
    if([FBDialogs canPresentShareDialogWithOpenGraphActionParams:params]) {
        // Show the share dialog
        [FBDialogs presentShareDialogWithOpenGraphAction:action
                                              actionType:@"timeflyz:create"
                                     previewPropertyName:@"countdown_invite"
                                                 handler:^(FBAppCall *call, NSDictionary *results, NSError *error) {
                                                     if(error) {
                                                         // An error occurred, we need to handle the error
                                                         // See: https://developers.facebook.com/docs/ios/errors
                                                         NSLog(@"Error publishing story: %@", error.description);
                                                     } else {
                                                         //                                                         NSLog(@"result %@", results);
                                                         if([[results objectForKey:@"completionGesture"] isEqualToString:@"post"]) {
                                                             NSLog(@"Posted successfully!");
                                                             [[NSNotificationCenter defaultCenter] postNotificationName:@"showShareSuccessfullMessage" object:self userInfo:nil];
                                                         } else
                                                             NSLog(@"Something else happened - user didn't post");
                                                     }
                                                 }];


    }

Note that "customURL" is an NSString that follows the pattern "?variable1=result1&variable2=result2..."