iOS Facebook SDK 3.2 Check Permissions via Graph Path Request - facebook

Question

I am trying to check if user has already granted publish permission or not. if he has not granted permissions before then i navigate him to permissions screen via: requestNewPublishPermissions
-(void)checkPermissions
{
// Get the most recent status
[FBRequestConnection
startWithGraphPath:#"me/permissions"
completionHandler:^(FBRequestConnection *connection,
id result,
NSError *error) {
if (!error) {
//This Condition Never Executed
if([[result objectForKey:#"data"] objectForKey:#"publish_actions"])
{
//permissions exist
}
else
{
[self openSessionForPublishPermissions];
}
NSString *permission = [[result objectForKey:#"data"] objectForKey:#"publish_actions"];
NSLog(#"permissions data = %#",data);
}
else
{
NSLog(#"error"); //Control goes to this block
}
}];
}
In code above if(!error) block is never executed and it always returns Error
Where i'm going wrong? Am i missing something?

Answer 1

You can see permissions in the active session. Here is how it's done in the HelloFacebookSample :
if ([FBSession.activeSession.permissions indexOfObject:#"publish_actions"] == NSNotFound) {
// permission does not exist
} else {
// permission exists
}

Answer 2

Instead of manually checking the permissions, you could check if the session is active and request publish permissions: if the user has already granted the permissions, an additional confirmation dialog will not be posted. See the code sample below:
- (void)requestWritePermission:(UIViewController *)viewController channel:(NSString *)channel callback:(void(^)(BOOL success))callback
{
if ([FBSession.activeSession isOpen])
{
[FBSession.activeSession requestNewPublishPermissions:#[#"publish_actions"]
defaultAudience:FBSessionDefaultAudienceFriends
completionHandler:^(FBSession *session, NSError *error) {
callback(error == nil);
}];
}
else
{
// Attempt to request publish permission without read permission.
}
}
The code is not complete, but should get you started.