Getting user information from Facebook using graph API - iphone

Question

I want to get basic user information from Facebook, but having some problem in the following code
-(void)checkForAccessToken:(NSString *)urlString {
NSError *error;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:#"access_token=(.*)&" options:0 error:&error];
if (regex != nil) {
**NSTextCheckingResult *firstMatch = [regex firstMatchInString:urlString options:0 range:NSMakeRange(0, [urlString length])];
if (firstMatch) {
NSRange accessTokenRange = [firstMatch rangeAtIndex:1];
NSString *accessToken = [urlString substringWithRange:accessTokenRange];
accessToken = [accessToken stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
[_delegate accessTokenFound:accessToken];
}**
}
}
In the firstMatch I am getting NULL that's why [_delegate accessTokenFound:accessToken]; this methods not get called.
Can anyone please help me out so that I would be able to user information from Facebook
Thanks in advance.

Answer 1

Call the fbdid login method after initialising it with app id and credentials.-
(void)fbDidLogin {
NSLog(#"fbDidLogin");
isFacebookLoaded=YES;
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:[facebook accessToken] forKey:#"FBAccessTokenKey"];
[defaults setObject:[facebook expirationDate] forKey:#"FBExpirationDateKey"];
[defaults synchronize];
NSLog(#"i am in and my acees token is %# %# and call me.CALLshowAloadingView",[facebook accessToken],[facebook expirationDate]) ;
[self.facebook requestWithGraphPath:#"me" andDelegate:self];
if ( [delegate respondsToSelector:#selector(showAloadingView)] )
{
NSLog(#" CALLshowAloadingView");
// calling delegate method. For this method to function, the delegate should be implemented in the calling class.
[delegate showAloadingView];
}
// Inform the delegate that Login is successful
if ( [delegate respondsToSelector:#selector(loginStatus:)] ) {
// calling delegate method. For this method to function, the delegate should be implemented in the calling class.
[delegate loginStatus:YES];
return;
}
}