Objective c - iOS 10 Facebook login blank screen

Question

In my app there is an option to login with Facebook.

On iOS 9.3 it's works OK.

When I testing it on iOS 10.0.1, it's shows me a blank screen.

I'm using this code to start the login process:

- (void)FacbookLoginButtonPressed:(id)sender {

    [self showLoader];

    FBSDKLoginManager *login = [[FBSDKLoginManager alloc] init];
    [login
     logInWithReadPermissions: @[@"public_profile", @"email"]
     fromViewController:self
     handler:^(FBSDKLoginManagerLoginResult *result, NSError *error) {
         if (error) {
             NSLog(@"Process error");
             [self hideLoader];
             [self showError:@"Error" message:@"Please try to use other login option"];
         } else if (result.isCancelled) {
             NSLog(@"Cancelled");
             [self hideLoader];
             [self showError:@"Error" message:@"Please try to use other login option"];
         } else {
             [self loginButton:sender didCompleteWithResult:result error:error];
             NSLog(@"Logged in");
         }
     }];
}

self is my ViewController calls loginViewController that shows the button, it inherit from UIViewController

My app using this library for slide navigation: https://github.com/aryaxt/iOS-Slide-Menu

There is two options to show the loginViewController screen:

1. From regular screen (inherit from UIViewController), there is a button, that on click this codes run:

UIStoryboard *sb = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
UIViewController *vc =  [sb instantiateViewControllerWithIdentifier:@"loginScreen";
[self presentViewController:vc animated:YES completion:nil];

That work's fine, I'm able to login with Facebook successfully.

2. From other screen that also inherit from UIViewController, but this screen is the slide menu, and I have this code in the AppDelegate

UIStoryboard *sb = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
MenuViewController *menu =  [sb instantiateViewControllerWithIdentifier:@"MenuViewController";
[SlideNavigationController sharedInstance].rightMenu = menu;

Using this option, the facebook login doesn't work (blank screen)

Action that I did in order to try make it works:

1. Update to the latest facebook SDK - using this: https://developers.facebook.com/docs/ios/getting-started
2. Enable keychain sharing - using this: https://stackoverflow.com/a/38799196/867694

The only thing that I have in the log when the loginViewController appears from the menu (2nd option) is this:

Presenting view controllers on detached view controllers is discouraged <loginViewController: 0x7622fb0>.

What can I do?

Answer 1

I finally fixed it, in MenuViewController I changed the way to present the loginViewController to this:

[self.view.window.rootViewController presentViewController:vc animated:YES completion:nil];