How to get a Facebook access token on iOS

Question

iOS beginner here. I have the following code:

[facebook authorize:nil delegate:self];
NSString *string1=[facebook accessToken];
NSLog(string1);

The log shows: miFOG1WS_7DL88g6d95Uxmzz7GCShsWx_FHuvZkmW0E.eyJpdiI6IjNZZkFBY1c5ZnBaMGEzOWM2RzNKbEEifQ.LNjl06lsOQCO9ArVARqff3Ur2XQHku3CMHDBKkpGg351EB33LGxVv96Hh5R860KDJL0cLq8QezSW0GovYxnhUucOwxlITV364sVKDXIzC3bAn9P_74r2Axl1SgOaTyMMkQ_aSQ2OWh-8d3Zn9BDt3pXVWzBLJ9I4XAosnw0GjuE

This seems too long to be an access token. I read it's supposed to be only 40 characters long. What am I doing wrong?

Answer 1

Using v3.2.1 as of March 20, 2013 of Facebook SDK.

NSString *fbAccessToken = [[[FBSession activeSession] accessTokenData] accessToken];

If you prefer dot syntax,

NSString *fbAccessToken = [FBSession activeSession].accessTokenData.accessToken;

For those using Swift;

var fbAccessToken = FBSession.activeSession().accessTokenData.accessToken

Update for v4.1.0 SDK onwards

Objective-C

NSString *fbAccessToken = [FBSDKAccessToken currentAccessToken].tokenString;

Swift

var fbAccessToken = FBSDKAccessToken.currentAccessToken().tokenString