Facebook login completion block not called

Question

I tried to implement Facebook login with a custom login button, I've completed all the setup steps and when I tap the button, the web view present and ask me to provide the permission.

However, if I tap Done(on top left of web view controller), the completion block is called but when I tap Cancel or OK, the web view controller dismissed but the completion block is never get called? Here's the code I used:

    let fbLoginManager = FBSDKLoginManager()
    fbLoginManager.loginBehavior = .Native
    fbLoginManager.logInWithReadPermissions(["email"], fromViewController: self) { (result, error) in
        // put a breakpoint here but it won't stop here if I tap OK
        if error != nil {
            print(error.localizedFailureReason)
        } else if result.isCancelled {
            // dismiss view
        } else {
            let token = result.token.tokenString
            // do something with the token
        }
    }

EDIT 1

Here's the open url method in AppDelegate:

func application(app: UIApplication, openURL url: NSURL, options: [String : AnyObject]) -> Bool {
    return application(app, openURL: url, sourceApplication: nil, annotation: [:])
}
func application(application: UIApplication, openURL url: NSURL, sourceApplication: String?, annotation: AnyObject) -> Bool {
    if url.scheme == Key.FACEBOOK_URL_SCHEME {
        let handled = FBSDKApplicationDelegate.sharedInstance().application(application, openURL: url, sourceApplication: sourceApplication, annotation: annotation)
        return handled
    }
    let dynamicLink = FIRDynamicLinks.dynamicLinks()?.dynamicLinkFromCustomSchemeURL(url)
    if let dynamicLink = dynamicLink {
        if let url = dynamicLink.url {
            if let paths = url.pathComponents{
                if paths.count > 2 {
                    let slug = paths[2]
                    if let book = AppManager.instance.findBookBySlug(slug) {
                        // Open detail book
                        self.openDetailBook(book)
                    } else {
                        self.openDetailBookWithSlug(slug)
                    }
                }
            }
        }
    }
    if url.scheme == Key.DEEP_LINK_URL_SCHEME {
        if let paths = url.pathComponents, host = url.host {
            if host == "truyen" {
                if paths.count > 1 {
                    let slug = paths[1]
                    if let book = AppManager.instance.findBookBySlug(slug) {
                        // Open detail book
                        self.openDetailBook(book)
                    } else {
                        self.openDetailBookWithSlug(slug)
                    }
                }
            }
        }
    }
    return true
}

pls look at http://stackoverflow.com/questions/32299271/facebook-sdk-login-never-calls-back-my-application-on-ios-9. Pls follow the answer suggested by David. — Teja Nandamuri, Jul 28 '16 at 11:17
you have to change return application(app, openURL: url, sourceApplication: nil, annotation: [:]) in your first open url method — Teja Nandamuri, Jul 28 '16 at 11:18
@TejaNandamuri Thanks for your comment, I did what David suggested in you link and it worked! Can you post as an answer so I can accept it? — JozackOverFlow, Jul 28 '16 at 11:28
I just did. I also added some info which help you to solve these kind of issues. — Teja Nandamuri, Jul 28 '16 at 11:30

score 2 · Accepted Answer · answered Jul 28 '16 at 11:25

If you ever face these situation, debug it yourself as Facebook SDK is open source. The window you are seeing is the SFSafariViewController. When you tap on any of those buttons, the call back will be handled by the SFSafariViewController. Look for the SFSafariViewController delegate methods in the Facebook sdk.

Put a breakpoint after you call the login code, and go step by step, it will take you to the class that uses SFSafariViewController.

In one of those delegate methods, you will find a call to the open url method. Implement the same open URL method in the app delegate method.

In your case the issue would be using wrong openURL method. The correct one shud be

func application(application: UIApplication,openURL url: NSURL, options: [String: AnyObject]) -> Bool {
return FBSDKApplicationDelegate.sharedInstance().application(application, 
     openURL: url, 
     sourceApplication: options[UIApplicationOpenURLOptionsSourceApplicationKey] as! String,
     annotation: options [UIApplicationOpenURLOptionsAnnotationKey])
}

score 2 · Answer 2 · answered Nov 20 '16 at 13:57

2

Swift 3,Removing this method worked for me,

func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {
    return application(app, open: url, sourceApplication: nil, annotation: [:])
}

answered Nov 20 '16 at 13:57

Mohammad Zaid Pathan

16,304
7
99
130

score 0 · Answer 3 · answered Jul 28 '16 at 11:02

0

Add Open url method in your AppDelegate.m file and put breakpoint in that method

- (BOOL)application:(UIApplication *)application openURL:( NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation
  return [[FBSDKApplicationDelegate sharedInstance] application:application openURL:url sourceApplication:sourceApplication  annotation:annotation];
}

answered Jul 28 '16 at 11:02

Monika Patel

2,287
3
20
45

Thanks for your answer but I did add the method, I have multiple scheme so there's an if clause for Facebook scheme, but it did jump into it if url.scheme == Key.FACEBOOK_URL_SCHEME { let handled = FBSDKApplicationDelegate.sharedInstance().application(application, openURL: url, sourceApplication: sourceApplication, annotation: annotation) return handled } – JozackOverFlow Jul 28 '16 at 11:06

Facebook login completion block not called

3 Answers3