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I'm trying to implement Like via the facebook open-graph-api with the Facebook iOS SDK 3.0. Everything seems to work except the FbGraphObject and that's because I have no idea how it should look because this clearly does not work.

What I'm trying to do is to like a url posted as an object. A simple Like with via the open-graph.

The error message I get the the code below is:

The action you're trying to publish is invalid because it does not specify any reference objects. At least one of the following properties must be specified: object.

The code I use is this:

 FBGraphObject *objectToLike = [[FBGraphObject alloc]initWithContentsOfURL:[NSURL URLWithString:facebookLike.titleLabel.text]]; FBRequest *requestLike = [[FBRequest alloc]initForPostWithSession:[FBSession activeSession] graphPath:@"me/og.likes" graphObject:objectToLike]; FBRequestConnection *connection = [[FBRequestConnection alloc] init]; [connection addRequest:requestLike completionHandler: ^(FBRequestConnection *connection, id result, NSError *error) { if (!error && result) { DLog(@"NothingWentWrong"); } DLog(@"MajorError: %@", error); } ]; [connection start];

UPDATE:

Checked some more info and my guess it to use this method: https://developers.facebook.com/docs/sdk-reference/iossdk/3.0/class/FBGraphObject/#//api/name/graphObject

To somehow create an object. It's the graphObject method that I probably need to do something with. Any help at all would be appreciated.

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4 Answers 4

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I've actually manage to create a simple and quite dirty solution of this. The solution does not seem optimal but it's currently a working solution.

If anybody has used the explorer tool on facebook on this url: https://developers.facebook.com/tools/explorer/

You know how the URL will look like when facebook is sharing a like. It has to have the URL and an access-token. So my solution became just to disregard sending anything from the Facebook SDK and just send a post request to the same URL that I've used in the explorer tool.

There seems to be some referencing to it on the facebooks docs if you look closely and deep, but no one explains exactly how to actually make the connection, so this is my solution:

NSString *urlToLikeFor = facebookLike.titleLabel.text; NSString *theWholeUrl = [NSString stringWithFormat:@"https://graph.facebook.com/me/og.likes?object=%@&access_token=%@", urlToLikeFor, FBSession.activeSession.accessToken]; NSLog(@"TheWholeUrl: %@", theWholeUrl); NSURL *facebookUrl = [NSURL URLWithString:theWholeUrl]; NSMutableURLRequest *req = [NSMutableURLRequest requestWithURL:facebookUrl]; [req setHTTPMethod:@"POST"]; NSURLResponse *response; NSError *err; NSData *responseData = [NSURLConnection sendSynchronousRequest:req returningResponse:&response error:&err]; NSString *content = [NSString stringWithUTF8String:[responseData bytes]]; NSLog(@"responseData: %@", content);

If you look at the code I just take the url and puts two dynamic strings in the url, one with the object-url and one with the access token. I create a URLRequest and make it a POST request, and the response from facebook gets logged so one actually can see if the like go through or not.

There might be some performance improvements that can be done with the actual requests but I will leave it up to you if you see any slowdowns.

I'm still interested in other solutions but this is the one I will use for now.

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8 Comments

Can you please tell me what is "urlToLikeFor", is it only 'id' of or complete url of any page
Complete URL of the web-page to like, this web-page has to implement the meta-tags that facebook provides.
Thanx For reply... you mean like this stackoverflow.com/questions/9038025/…
Yep... Like that. It is important to double-check the values. And create an object on developer.facebook.com so you actually can like the web-page.
What is facebookLike.titleLabel.text? it should be "facebook.com/samplepage". or some other?
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We don't currently support Like through our Graph API. What you can look through is something like this : https://developers.facebook.com/docs/opengraph/actions/builtin/likes/

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2 Comments

That is what I'm trying to do :P.
Any idea when this feature is coming? This must be one of the most requested features.
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I’m not sure what initWithContentsOfURL does, but from the name I guess it tries to actually load content from a given URL(?).

You only have to give the URL as a text parameter – a URL is what represents an Open Graph object. Facebook will do the rest, scraping the page behind that URL and reading it’s OG meta tags, etc.

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by url as a text parameter do you mean a string? and can you give me some pointers on how to do it?
Yes, and no (since I don’t do any iPhone dev stuff).
The only problem is that the instance of FBGraphObject does not seem to accept a string in any way. The problem here is that the FBGraphObject is somehow wrong and I can't make my string an object. I'm pretty sure I've implemented the FBGraphObject wrong.
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Maybe just this?

 FBRequest *requestLike = [[FBRequest alloc]initForPostWithSession:[FBSession activeSession] graphPath:@"me/og.likes" graphObject:[NSURL URLWithString:facebookLike.titleLabel.text]];
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1 Comment

tried it, I somehow have to implement the protocol FBOpenGraphAction, But I'm still not quite sure how. developers.facebook.com/docs/sdk-reference/iossdk/3.0/protocol/…

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