FacebookSDK(4.7) Custom Login UI Button - Swift 2.0

Question

I am new to swift, How to resolve this error of optional "fatal error: unexpectedly found nil while unwrapping an Optional value". This error occurs when i cancelled the Facebook login process.

It may helps you: http://stackoverflow.com/a/24643643/988169 — pkc456, Oct 12 '15 at 08:49

score 0 · Answer 1 · answered Oct 12 '15 at 08:51

0

Change that line to an if let and if you fail that check it probably means you canceled the login process, since grantedPermissions were never... granted!

In the else block handle when a user cancels the login process. Hope this helped.

answered Oct 12 '15 at 08:51

VeganKid

457
5
16

thanks but I know that it can be solved by if let binding but how? for Bool – Sourabh Sharma Oct 12 '15 at 08:54

score 0 · Accepted Answer · answered Oct 14 '15 at 13:54

This error occurred because i was not handling the canceling event.

    @IBAction func FBAction(sender: AnyObject) {
            let fbLoginManager : FBSDKLoginManager = FBSDKLoginManager()
            fbLoginManager.logInWithReadPermissions(["email"], fromViewController: self, handler:{ (result, error) -> Void in

                if ((error) != nil){
                     // Process error
                }
                else if result.isCancelled {
                    // Handle cancellations 
                    //This method ; I should have implemented
                }
                else {
                    let fbloginresult : FBSDKLoginManagerLoginResult = result
                    if(fbloginresult.grantedPermissions.contains("email"))
                    {
                        self.getFBUserData()
                        fbLoginManager.logOut()
                    }
                }

            })
        }

FacebookSDK(4.7) Custom Login UI Button - Swift 2.0

2 Answers2