FBFriendPickerViewController is loading a empty tableview intermittently - session

Question

I am using FBFriendPickerViewController to load friends after user signs in. However, an empty table view is being loaded. The friends of the user from fb are not showing up.
Heres the code.
- (IBAction)inviteButtonTouchHandler:(id)sender {
if (!_friendPickerController) {
_friendPickerController = [[FBFriendPickerViewController alloc] initWithNibName:nil bundle:nil];
_friendPickerController.delegate = self;
_friendPickerController.title = #"Select friends";
_friendPickerController.allowsMultipleSelection = NO;
}
[_friendPickerController clearSelection];
[_friendPickerController loadData];
[self presentViewController:_friendPickerController animated:YES completion:nil];
}
This code is called after login which is done like this in appDelegate following the Facebook Tutorial -
- (void)openSession
{
NSArray *permissions = #[#"friends_about_me"];
[FBSession openActiveSessionWithReadPermissions:permissions
allowLoginUI:YES
completionHandler:
^(FBSession *session,
FBSessionState state, NSError *error) {
[self sessionStateChanged:session state:state error:error];
}];
}

Answer 1

You need to add the following code in viewDidLoad method of your viewController.
if (!FBSession.activeSession.isOpen) {
// if the session is closed, then we open it here, and establish a handler for state changes
[FBSession.activeSession openWithCompletionHandler:^(FBSession *session,
FBSessionState state,
NSError *error) {
switch (state) {
case FBSessionStateClosedLoginFailed:
{
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:#"Error"
message:error.localizedDescription
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[alertView show];
}
break;
default:
break;
}
}];
}