Check if logged in on ios facebook sdk 3.0 - ios

Question

I am using iOS facebook SDK 3.0. How can i check if the user is already logged in?
I tried the line below but it does not work properly. It sometimes returns NO although I am logged in. Any suggestions?
if (FBSession.activeSession.isOpen == YES)
{
// post to wall else login
}
-- EDIT --
this is how I open my Facebook session:
NSArray *permissions = [[NSArray alloc] initWithObjects:
#"user_likes",
#"read_stream",
#"publish_actions",
nil];
return [FBSession openActiveSessionWithPermissions:permissions
allowLoginUI:allowLoginUI
completionHandler:^(FBSession *session,
FBSessionState state,
NSError *error) {
[self sessionStateChanged:session
state:state
error:error];
}];
The first time it needs login and so it works. If i try this while I am already logged in the FBSession.activeSession.isOpen returns NO.

Answer 1

You can check if you have a valid token by trying to open a new session without allowing the
login UI
if (FBSession.activeSession.isOpen)
{
// post to wall
} else {
// try to open session with existing valid token
NSArray *permissions = [[NSArray alloc] initWithObjects:
#"user_likes",
#"read_stream",
#"publish_actions",
nil];
FBSession *session = [[FBSession alloc] initWithPermissions:permissions];
[FBSession setActiveSession:session];
if([FBSession openActiveSessionWithAllowLoginUI:NO]) {
// post to wall
} else {
// you need to log the user
}
}

Answer 2

If you are using FBSDK greater then 4.x then there is no concept of FBSession. You have to find the active session only by using [FBSDKAccessToken currentAccessToken] simply check if it has nil value, no active session else it is.
Instead, you should check [FBSDKAccessToken currentAccessToken] at
viewDidLoad or similar. If a current token is available, do the
post-login work. You can also use currentAccessToken to retrieve
cached tokens.
you can find more here https://developers.facebook.com/docs/ios/upgrading-4.x
FBSession.activeSession has been replaced with [FBSDKAccessToken currentAccessToken] and FBSDKLoginManager. There is no concept of
session state. Instead, use the manager to login and this sets the
currentAccessToken reference.

Answer 3

i did it as in the Facebook example
if (FBSession.activeSession.state == FBSessionStateCreatedTokenLoaded)
{
}

Answer 4

The session is active if the state is either in FBSessionStateOpen or in FBSessionStateOpenTokenExtended. You can use the function below to check if the user is logged in:
- (BOOL)isSessionOpen
{
return FBSession.activeSession.state == FBSessionStateOpen || FBSession.activeSession.state == FBSessionStateOpenTokenExtended;
}

Answer 5

How are you opening your FBSession?
If you're creating an instance, be sure to set FBSession.activeSession. That was my issue for a while.

Answer 6

if ([FBSDKAccessToken currentAccessToken])
{
NSLog(#"Already login");
//[FBSession openActiveSessionWithAllowLoginUI: YES];
}