iOS Facebook login doesn't work - ios

Question

I have an app, for iOS5 and above, in which I am trying to set up Facebook login. All works fine when there is a Facebook account integrated in the phone. If it is not, it doesn't work. This is even if the Facebook app is installed.
When the app is installed, it opens the app, asks me permission to access the appropriate user data and returns to my app with no result. It the same when it isn't installed. Safari is opened, asks me for authorization, returns, and nothing.
I followed all the steps mentioned in the Facebook Login tutorial. Is this a problem only I am facing?
EDIT: This is the requested code:
I open a session like so:
- (BOOL)openSessionWithAllowLoginUI:(BOOL)allowLoginUI {
NSArray *permissions = [[NSArray alloc] initWithObjects:
#"email",
nil];
return [FBSession openActiveSessionWithReadPermissions:permissions
allowLoginUI:allowLoginUI
completionHandler:^(FBSession *session,
FBSessionState state,
NSError *error) {
[self sessionStateChanged:session
state:state
error:error];
}];
}
And when it returns, I guess this method must be called. but it isn't:
- (void)sessionStateChanged:(FBSession *)session
state:(FBSessionState) state
error:(NSError *)error
{
switch (state) {
case FBSessionStateOpen:
if (!error) {
// We have a valid session
NSLog(#"session opened");
FBRequest *me = [FBRequest requestForMe];
__block NSString *username = nil;
[me startWithCompletionHandler:^(FBRequestConnection *connection,
id result,
NSError *error) {
NSDictionary<FBGraphUser> *my = (NSDictionary<FBGraphUser> *) result;
// NSLog(#"User session found: %#", my.username);
username = my.username;
}];
// /fb_access/:access_token
}
break;
case FBSessionStateClosed:
if (!error) {
// We have a valid session
NSLog(#"User session closed");
}
case FBSessionStateClosedLoginFailed:
NSLog(#"login failed, %#", error);
[FBSession.activeSession closeAndClearTokenInformation];
break;
default:
break;
}
[[NSNotificationCenter defaultCenter]
postNotificationName:FBSessionStateChangedNotification
object:session];
if (error) {
UIAlertView *alertView = [[UIAlertView alloc]
initWithTitle:#"Error"
message:error.localizedDescription
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[alertView show];
}
}
Any ideas?

Answer 1

add below key-value pair in your plist.
Add Field (key) FacebookAppID - (value) fbID
Add Field - URL Types (key)
Add 2 Field in URL Types:
(key) URL Identifier - (value) (i.e. YourApplication name)
(key)-URL Schemes
Add Field in URL Schemes (key) - (value) fb(fbID) (e.g. fb557354324264278)

Answer 2

Add following method in to your appdelgate
- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
{ // attempt to extract a token from the url return
[FBSession.activeSession handleOpenURL:url];
}

Answer 3

Both answers by iUser and Kalpesh are right. Combining both of them worked for me. Please refer to them. :)