FBSession Must Be Specified Parse - ios

Question

I am trying to follow the Parse tutorial for Logging in With Facebook. However, the sample code does not match up with the guide, so the code there is useless. I have followed the guide completely, but after I login, it directs me to Facebook app, I give permission, it goes back to the app I am building, but I get the following error
FBSDKLog: Error for request to endpoint 'me': An open FBSession must be specified for calls to this endpoint.
What is going on? In Login controller:
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
FBRequest *request = [FBRequest requestForMe];
[request startWithCompletionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
if (!error) {
// handle successful response
} else if ([[[[error userInfo] objectForKey:#"error"] objectForKey:#"type"]
isEqualToString: #"OAuthException"]) { // Since the request failed, we can check if it was due to an invalid session
NSLog(#"The facebook session was invalidated");
[self logoutButtonAction:nil];
} else {
NSLog(#"Some other error: %#", error);
}
}];
if ([PFUser currentUser] && // Check if user is cached
[PFFacebookUtils isLinkedWithUser:[PFUser currentUser]]) { // Check if user is linked to Facebook
// Present the next view controller without animation
[self _presentUserDetailsViewControllerAnimated:NO];
}
}
- (IBAction)loginButtonTouchHandler:(id)sender {
// Set permissions required from the facebook user account
NSArray *permissionsArray = #[ #"user_about_me", #"user_relationships", #"user_birthday", #"user_location"];
[PFFacebookUtils initializeFacebook];
// Login PFUser using Facebook
[PFFacebookUtils logInWithPermissions:permissionsArray block:^(PFUser *user, NSError *error) {
[_activityIndicator stopAnimating]; // Hide loading indicator
if (!user) {
NSString *errorMessage = nil;
if (!error) {
NSLog(#"Uh oh. The user cancelled the Facebook login.");
errorMessage = #"Uh oh. The user cancelled the Facebook login.";
} else {
NSLog(#"Uh oh. An error occurred: %#", error);
errorMessage = [error localizedDescription];
}
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Log In Error"
message:errorMessage
delegate:nil
cancelButtonTitle:nil
otherButtonTitles:#"Dismiss", nil];
[alert show];
} else {
if (user.isNew) {
NSLog(#"User with facebook signed up and logged in!");
} else {
NSLog(#"User with facebook logged in!");
}
[self _presentUserDetailsViewControllerAnimated:YES];
}
}];
[_activityIndicator startAnimating]; // Show loading indicator until login is finished
}
- (void)_presentUserDetailsViewControllerAnimated:(BOOL)animated {
UserDetailsViewController *detailsViewController = [[UserDetailsViewController alloc] init];
[self.navigationController pushViewController:detailsViewController animated:YES];
}
In my UserDetailsViewController:
- (void)viewDidLoad {
// ...
[self _loadData];
}
- (void)_loadData {
// ...
FBRequest *request = [FBRequest requestForMe];
[request startWithCompletionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
if (!error) {
// result is a dictionary with the user's Facebook data
NSDictionary *userData = (NSDictionary *)result;
NSString *facebookID = userData[#"id"];
NSString *name = userData[#"name"];
NSString *location = userData[#"location"][#"name"];
NSString *gender = userData[#"gender"];
NSString *birthday = userData[#"birthday"];
NSString *relationship = userData[#"relationship_status"];
NSURL *pictureURL = [NSURL URLWithString:[NSString stringWithFormat:#"https://graph.facebook.com/%#/picture?type=large&return_ssl_resources=1", facebookID]];
// URL should point to https://graph.facebook.com/{facebookId}/picture?type=large&return_ssl_resources=1
NSURLRequest *urlRequest = [NSURLRequest requestWithURL:pictureURL];
// Run network request asynchronously
[NSURLConnection sendAsynchronousRequest:urlRequest
queue:[NSOperationQueue mainQueue]
completionHandler:
^(NSURLResponse *response, NSData *data, NSError *connectionError) {
if (connectionError == nil && data != nil) {
// Set the image in the header imageView
self.headerImageView.image = [UIImage imageWithData:data];
}
}];
// Now add the data to the UI elements
// ...
}
}];
}

Answer 1

We figured it out, when trying to create an auto-login feature with this function:
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
FBRequest *request = [FBRequest requestForMe];
[request startWithCompletionHandler:^(FBRequestConnection *connection, id result, NSError *error) {
if (!error) {
// handle successful response
} else if ([[[[error userInfo] objectForKey:#"error"] objectForKey:#"type"]
isEqualToString: #"OAuthException"]) { // Since the request failed, we can check if it was due to an invalid session
NSLog(#"The facebook session was invalidated");
[self logoutButtonAction:nil];
} else {
NSLog(#"Some other error: %#", error);
}
}];
if ([PFUser currentUser] && // Check if user is cached
[PFFacebookUtils isLinkedWithUser:[PFUser currentUser]]) { // Check if user is linked to Facebook
// Present the next view controller without animation
[self _presentUserDetailsViewControllerAnimated:NO];
}
}
We actually end up skipping the [PFFacebookUtils initializeFacebook] call, since it only happens when you push the login button. The solution is to put this call in the appDelegate in the method application:didFinishLaunchingWithOptions: