Native Facebook Login Stopped Working After Sdk Update to 3.14

Native Facebook Login stopped working after SDK update to 3.14

I just ran to this issue also, here's the details on what has happened & how I fixed my app.

Bottom line
Due to the new login process wherein users can now approve / deny each requested permission (something not supported by the native ios integrated login), Facebook has changed the sdk's default login behavior to first try the Facebook fast app switch & then fall back on the web view, completely ignoring any ios system level Facebook credentials.

This is noted in the upgrade guide (form 3.13 > 3.14) here: https://developers.facebook.com/docs/ios/upgrading

Relevant portion:

"The default login behavior has changed from FBSessionLoginBehaviorUseSystemAccountIfPresent to FBSessionLoginBehaviorWithFallbackToWebView."

So what to do?

Well, if you don't need any of the new things, FBLikeControl etc..., that were introduced in 3.14, you could just downgrade to 3.13. However, if you want/need to use 3.14n there's an instance method on FBSession that takes the FBSessionLoginBehavior as a parameter: https://developers.facebook.com/docs/reference/ios/current/class/FBSession/#openWithBehavior:completionHandler:

I updated the body of my method for opening a Facebook session from:

    [FBSession openActiveSessionWithReadPermissions:@[@"email", @"user_location"]
                                       allowLoginUI:YES
                                  completionHandler:
                                          ^(FBSession *session, FBSessionState state, NSError *error) {
                                              [self sessionStateChanged:session state:state error:error];
                                          }
    ];

to:

    FBSessionStateHandler completionHandler = ^(FBSession *session, FBSessionState status, NSError *error) {
        [self sessionStateChanged:session state:status error:error];
    };

    if ([FBSession activeSession].state == FBSessionStateCreatedTokenLoaded) {
        // we have a cached token, so open the session
        [[FBSession activeSession] openWithBehavior:FBSessionLoginBehaviorUseSystemAccountIfPresent
                  completionHandler:completionHandler];
    } else {
        [self clearAllUserInfo];
        // create a new facebook session
        FBSession *fbSession = [[FBSession alloc] initWithPermissions:@[@"email", @"user_location"]];
        [FBSession setActiveSession:fbSession];
        [fbSession openWithBehavior:FBSessionLoginBehaviorUseSystemAccountIfPresent
                  completionHandler:completionHandler];
    }

NOTE: my clearAllUserInfo method includes the following lines:

    [FBSession.activeSession closeAndClearTokenInformation];
    [FBSession renewSystemCredentials:^(ACAccountCredentialRenewResult result, NSError *error) {
        NSLog(@"%@", error);
    }];
    [FBSession setActiveSession:nil];

It's also worth checking out the Facebook documentation on understanding sessions: http://developers.facebook.com/docs/facebook-login/ios/v2.0#sessions

Can't get native login to work with Facebook iOS SDK

To get authenticated from the native facebook app, you need to FacebookAppID and url type in info.plist file, make sure you're using same bundle identifier as you mentioned in facebook app settings.

Check screenshot:
I am new to Facebook SDK with iOS. I want to send invitation to friends on Facebook

Login doesn't work/stuck with Latest Facebook SDK

I was having the same problem. Add this to your AppDelegate:

In AppDelegate.m

1. In application:didFinishLaunchingWithOptions:

   -(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
       [[FBSDKApplicationDelegate sharedInstance] application:application
                            didFinishLaunchingWithOptions:launchOptions];
   }
   

2. Add the following method to your AppDelegate.m:

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

I don't know if the SafariViewController checks for the application:openURL:sourceApplication:annotation but this worked for me.
Give it a try. I hope it works for you.

Source: https://developers.facebook.com/docs/ios/getting-started

Facebook iOS SDK native login not working

The answer to

'why native login is not working with latest FB SDK is still a
mystery'?

is here. See the upgrade guide form 3.13 > 3.14.
The default login behavior has changed from FBSessionLoginBehaviorUseSystemAccountIfPresent to FBSessionLoginBehaviorWithFallbackToWebView

Facebook login fails (always isCancelled) after upgrading to SDK 4.1

Thanks to Dheeraj and its answer to a similar question, I found the error in my calls. I just made the stupidest error in Swift. In the unlikely event someone as dumb as I am read this, here are the 3 calls in Swift that you should add in your AppDelegate.swift. They are tested and working:

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

    // Do what you have to do but at the end, instead of 'return true', put :

    return FBSDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions)
}

func application(application: UIApplication, openURL url: NSURL, sourceApplication: String?, annotation: AnyObject?) -> Bool {
    return FBSDKApplicationDelegate.sharedInstance().application(application, openURL: url, sourceApplication: sourceApplication, annotation: annotation)
}

func applicationDidBecomeActive(application: UIApplication) {
    FBSDKAppEvents.activateApp()
}

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