[Facebook-iOS-SDK 4.0]How to get user email address from FBSDKProfile

To fetch email you need to utilize the graph API, specifically providing the parameters field populated with the fields you want. Take a look at Facebook's Graph API explore tool, which can help to figure out the queries. https://developers.facebook.com/tools/explorer

The code that worked for me to fetch email is the following, which assumes you are already logged in:

    NSMutableDictionary* parameters = [NSMutableDictionary dictionary];
    [parameters setValue:@"id,name,email" forKey:@"fields"];

    [[[FBSDKGraphRequest alloc] initWithGraphPath:@"me" parameters:parameters]
     startWithCompletionHandler:^(FBSDKGraphRequestConnection *connection,
                                  id result, NSError *error) {
         aHandler(result, error);
     }];

That's correct. The email address is not present in the FBSDKProfile object. You should use FB's Graph API instead. There is plenty of info and code samples at the FB Developer site https://developers.facebook.com/docs/ios/graph

To answer your question, try something like this.

if ([FBSDKAccessToken currentAccessToken]) {
   [[[FBSDKGraphRequest alloc] initWithGraphPath:@"me" parameters:@{@"fields": @"email"}]
    startWithCompletionHandler:^(FBSDKGraphRequestConnection *connection, id result, NSError *error) {
      if (!error) {
         NSLog(@"user:%@", result);       
      }
  }];
}

Code corrected:

  if ([FBSDKAccessToken currentAccessToken]) {
    [[[FBSDKGraphRequest alloc] initWithGraphPath:@"me" parameters:nil]
        startWithCompletionHandler:^(FBSDKGraphRequestConnection *connection,
                                     id result, NSError *error) {
          if (!error) {
            NSLog(@"fetched user:%@", result);
          }
        }];
  }