How do I get the Facebook user Id from the Facebook object in the iOS SDK?

问题

I see that the access token is available in the Facebook object, but I don't see a Facebook user Id.

I could make a graph request to "me" to get the Facebook Id, but I'd prefer not to make the extra api call.

回答1:

You will have to call /me to get the id. iOS access tokens are now encrypted and thus you won't be able to parse the user id from it. Also, server side tokens will all be encrypted with oauth 2.0 soon too.

回答2:

There is an easy way to get this these days; assuming you already have a FBSession open, you could just do this:

[FBRequestConnection startForMeWithCompletionHandler:
  ^(FBRequestConnection *connection, id result, NSError *error)
  {
      NSLog(@"facebook result: %@", result);
  }];

回答3:

You can just use this:

[[account valueForKey:@"properties"] valueForKey:@"uid"]

E-mail can be found with this:

[[account valueForKey:@"properties"] valueForKey:@"ACUIDisplayUsername"]

where account is ACAccount type of course

回答4:

Can get it with [FBSession activeSession].accessTokenData.userID

来源：https://stackoverflow.com/questions/7363778/how-do-i-get-the-facebook-user-id-from-the-facebook-object-in-the-ios-sdk