Can't log in via Facebook. Log in to iOS 10

Question

I'm having trouble logging into Facebook using the latest version of iOS 10 and the latest version of the Facebook SDK using Cocoapods. This worked fine, and now it does not work. When I return from the entrance to the access token, zero. Previously, it was not zero. I see a message in my journal. I was looking for an error and found nothing. I followed the instructions in the Facebook Developer Guide.

2016-11-04 10: 10: 26.122435 Ghosts [833: 83731] FBSDKLog: Invalid identifier: 'fb_mobile_login_native_app_switch_dialog_result'. It must be between 1 and 40 characters and must contain only alphanumeric characters, _, - or spaces, starting with alphanumeric or _.```

if ([FBSDKAccessToken currentAccessToken]) { } 

FBSDKCoreKit 4.17.0

iOS 10.1.1

Xcode 8.1

Objective-C with ARC

Answer 1

It turns out that the access token can be nil right after. You must wait for a notification before it can be used. I think this is a new requirement.

 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(checkLogIn) name: FBSDKAccessTokenDidChangeNotification object:nil]; 

.

This other error message was just a warning that I think.