Facebook SDK 3.1 for iOS login issues - objective-c

Question

I have used Facebook sdk 3.1 in my ios app for sharing link on friends wall. I try to open a new session in the applicationDidFinishLaunching method as below
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
myAppDelegate = self;
AudioViewController *viewController = [[AudioViewController alloc] init];
self.navController = [[UINavigationController alloc] initWithRootViewController:viewController];
[self.navController setNavigationBarHidden:YES];
viewController = nil;
self.window.rootViewController = self.navController;
[self.window makeKeyAndVisible];
if (![self openSessionWithAllowLoginUI:NO]) {
// No? Display the login page.
[self performSelector:#selector(login) withObject:nil afterDelay:0.5];
}
return YES;
}
- (void)login{
[self openSessionWithAllowLoginUI:YES];
}
- (BOOL)openSessionWithAllowLoginUI:(BOOL)allowLoginUI {
return [FBSession openActiveSessionWithReadPermissions:nil
allowLoginUI:allowLoginUI
completionHandler:^(FBSession *session, FBSessionState state, NSError *error) {
[self sessionStateChanged:session state:state error:error];
}];
}
- (void)sessionStateChanged:(FBSession *)session
state:(FBSessionState)state
error:(NSError *)error{
switch (state) {
case FBSessionStateOpen: {
DLOG(#"session open");
}
break;
case FBSessionStateClosed: {
DLOG(#"session closed");
[FBSession.activeSession closeAndClearTokenInformation];
}
break;
case FBSessionStateClosedLoginFailed: {
DLOG(#"session Failed");
}
break;
default:
break;
}
[[NSNotificationCenter defaultCenter] postNotificationName:WVSessionStateChangedNotification
object:session];
if (error) {
DLOG(#"error = %#",error);
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:[NSString stringWithFormat:#"Error: %#",
[AppDelegate FBErrorCodeDescription:error.code]]
message:error.localizedDescription
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[alertView show];
}
}
With some of the Facebook accounts it returns error "The operation could not be completed" com.facebook.sdk error 2. and so further cannot post on Facebook.
Am I doing something wrong here ?Any help would be appreciated.!

Answer 1

I had same issue, and i have solved it by calling openSessionWithAllowLoginUI:TRUE via NSTimer.
if (![self openSessionWithAllowLoginUI:NO]) {
// No? Display the login page.
[NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:#selector(login) userInfo:nil repeats:NO];
}
The reason is, we can't get FB session on different threads, either we use main thread or another(background) thread. In your code, when you check session availability, you use main thread and for login, you use different thread via performSelector function.
Hope, it will help you.
thanks