Question

Is there already a way with the Facebook iOS API to get a list of friends who have your app installed? I basically require something similar to "Words with Friends" where they can determine which of your Facebook friends are playing the game. I have one solution which requires some extra database use but was hoping maybe the Facebook API had something built in for this kind of query.

Answer 1

Create a FBFriendPickerDelegate delegate class and override this function:

-(BOOL)friendPickerViewController:(FBFriendPickerViewController *)friendPicker shouldIncludeUser:(id<FBGraphUser>)user{
    BOOL installed = [user objectForKey:@"installed"] != nil;
    return installed;
}

For users that do not have your app installed, installed field will be nil, but you have to request it when you load data:

self.friendsController = [[FBFriendPickerViewController alloc] initWithNibName:nil bundle:nil];
//...
NSSet *fields = [NSSet setWithObjects:@"installed", nil];
self.friendPickerController.fieldsForRequest = fields;
//...
[self.friendsController loadData];