Unable to get Email Id Of logged person in Facebook ios SDK - ios

Question

I am working on a Facebook IOS app to fetch user data(Public Profile,Email) from the Facebook.After implementing login process i am able to fetch first name,last name and url for profile picture of the User but the email i am getting is null. i have passed the permission for getting public Profile and Emial.but i am not getting Email Of the person.
I am using facebook SDK for ios V4.0.1
Here is my code
[[[FBSDKGraphRequest alloc] initWithGraphPath:#"me"
parameters:#{#"fields": #"first_name, last_name, picture, email"}]
startWithCompletionHandler:^(FBSDKGraphRequestConnection *connection, id result, NSError *error) {
if (!error) {
NSString *firstName = [NSString stringWithFormat:#"%#",[result objectForKey:#"first_name"]];
NSString *lastName = [NSString stringWithFormat:#"%#",[result objectForKey:#"last_name"]];
NSString *email = [NSString stringWithFormat:#"%#",[result objectForKey:#"email"]];
NSString *picurl = [NSString stringWithFormat:#"%#",[result objectForKey:#"picture"]];
NSLog(#"email is %#", [result objectForKey:#"email"]);
NSLog(#"picture is %#", [result objectForKey:#"picture"]);
}
else{
NSLog(#"%#", [error localizedDescription]);
}
}];
I am getting the Following Output:
email is (null)
picture is {
data = {
"is_silhouette" = 0;
url = "https://fbcdn-profile-a.akamaihd.net/hprofile-ak-xfp1/v/t1.0-1/p50x50 **************_************_n.jpg?oh=ed5fd60c770cb5f34424b3fcfb4ca174&oe=559F472D&__gda__=1437970763_989a264cf7ec16f5d51b0a58b7e7f609";
};
}
why i am not getting Email Address of the User

Answer 1

While logging. You must ask user permission for email or else you would get email as (null).
Would not fetch Email ID
FBSDKLoginButton *loginView = [[FBSDKLoginButton alloc] init];
loginView.readPermissions = #[#"public_profile"];
IF you login with above permission then you would not be able to get email id it will always be return (null).
Would fetch Email ID with Public profile
FBSDKLoginButton *loginView = [[FBSDKLoginButton alloc] init];
loginView.readPermissions = #[#"email"];
Our app gets public_profile permission automatically upon any successful login but it does not get email.
Same goes for custom login as well.
Refer to :https://developers.facebook.com/docs/facebook-login/ios/v2.3#login-apicalls

Answer 2

If you were to assume the logic that setting FBSDKLoginButton.readPermissions to ["public_profile","email"] would be the way to express that you want the Facebook user's "public_profile" and their "email" address you will be sorely mistaken. Very confusing in my opinion, the following gives you both the Facebook user's public profile and their email address:
FBSDKLoginButton.readPermissions = ["email"]