FBSession: an attempt was made reauthorize permissions on an unopened session - ios

Question

I'm following this tutorial
to implement the view preview post on Facebook SDK 3.1, but when I call this method
...
// Ask for publish_actions permissions in context
if ([FBSession.activeSession.permissions
indexOfObject:#"publish_actions"] == NSNotFound) {
// No permissions found in session, ask for it
[FBSession.activeSession
reauthorizeWithPublishPermissions:
[NSArray arrayWithObject:#"publish_actions"]
defaultAudience:FBSessionDefaultAudienceFriends
completionHandler:^(FBSession *session, NSError *error) {
if (!error) {
// If permissions granted, publish the story
[self publishStory];
}
}];
} else {
// If permissions present, publish the story
[self publishStory];
}
...
returns the following error:
* Terminating app due to uncaught exception 'com.facebook.sdk: InvalidOperationException', reason: 'FBSession: an attempt was made
​​reauthorize permissions on an unopened session'
What is happening can? Thank you!
EDIT:
Ran my friend, thank you very much, but still have a detail ...When'll post the first time he asks to authorize the application I authorize this block of fall
/*
* open a new session with publish permission
*/
[FBSession openActiveSessionWithPublishPermissions:[NSArray arrayWithObject:#"publish_actions"]
defaultAudience:FBSessionDefaultAudienceOnlyMe
allowLoginUI:YES
completionHandler:^(FBSession *session, FBSessionState status, NSError *error) {
if (!error && status == FBSessionStateOpen) {
[self publishStory];
}else{
NSLog(#"error");
//Here I get the error mentioned below
}
}];
}
with the error: error:
domain = com.facebook.sdk, code = 5

Answer 1

The error says that the FBSession is not opened. so you should check if the session is opened before trying to reauthorize.
if ([[FBSession activeSession] isOpen]) {
/*
* if the current session has no publish permission we need to reauthorize
*/
if ([[[FBSession activeSession] permissions]indexOfObject:#"publish_actions"] == NSNotFound) {
[[FBSession activeSession] requestNewPublishPermissions:[NSArray arrayWithObject:#"publish_actions"] defaultAudience:FBSessionDefaultAudienceFriends
completionHandler:^(FBSession *session,NSError *error){
[self postPhoto];
}];
}else{
[self publishStory];
}
}else{
/*
* open a new session with publish permission
*/
[FBSession openActiveSessionWithPublishPermissions:[NSArray arrayWithObject:#"publish_actions"]
defaultAudience:FBSessionDefaultAudienceOnlyMe
allowLoginUI:YES
completionHandler:^(FBSession *session, FBSessionState status, NSError *error) {
if (!error && status == FBSessionStateOpen) {
[self publishStory];
}else{
NSLog(#"error");
}
}];
}
Make sure to consistently request for the same permissions which should be publish_actions (mind the plural).

Answer 2

You also need another method in AppDelegate:
- (BOOL)application:(UIApplication *)application
openURL:(NSURL *)url
sourceApplication:(NSString *)sourceApplication
annotation:(id)annotation {
// attempt to extract a token from the url
return [FBAppCall handleOpenURL:url
sourceApplication:sourceApplication
fallbackHandler:^(FBAppCall *call) {
NSLog(#"In fallback handler");
}];
}
This will handle the url callback if the authentication is done in safari. After that the FBSession will be open.