FBSDKLoginManager logInWithPublishPermissions always returns isCancelled=YES

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You should try adding in your AppDelegate didFinishLaunchingWithOptions :

return [[FBSDKApplicationDelegate sharedInstance] application:application
                                    didFinishLaunchingWithOptions:launchOptions];

This would get u [FBSDKAccessToken currentAccessToken] when user is logged in.

and 

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

If this method is not present into AppDelegate then it results into cancelled state.

Refer to : https://developers.facebook.com/docs/ios/getting-started#startcoding

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