如何在iOS社交框架中使用SLRequest获取facebook的电子邮件参数

我尝试使用以下代码来获取登录 iOS 设置 Facebook 的人的电子邮件。 请帮助我如何从 SLRequest 获取电子邮件。

- (void) getMyDetails {
if (! _accountStore) {
    _accountStore = [[ACAccountStore alloc] init];
}

if (! _facebookAccountType) {
    _facebookAccountType = [_accountStore accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierFacebook];
}

NSDictionary *options = @{ ACFacebookAppIdKey: FB_APP_ID };

    [_accountStore requestAccessToAccountsWithType: _facebookAccountType
                                           options: options
                                        completion: ^(BOOL granted, NSError *error) {
        if (granted) {
            NSArray *accounts = [_accountStore accountsWithAccountType:_facebookAccountType];
            _facebookAccount = [accounts lastObject];

            NSURL *url = [NSURL URLWithString:@"https://graph.facebook.com/me"];

            SLRequest *request = [SLRequest requestForServiceType:SLServiceTypeFacebook
                                                    requestMethod:SLRequestMethodGET
                                                              URL:url
                                                       parameters:nil];
            request.account = _facebookAccount;

            [request performRequestWithHandler:^(NSData *responseData, NSHTTPURLResponse *urlResponse, NSError *error) {
                NSDictionary *responseDictionary = [NSJSONSerialization JSONObjectWithData:responseData
                                                                                   options:NSJSONReadingMutableContainers
                                                                                     error:nil];
                NSLog(@"id: %@", responseDictionary[@"id"]);

            }];
        } 
    }];
}

以下是在 iOS 8 上测试的返回电子邮件的代码。该解决方案不需要 Facebook SDK，尽管系统仅当用户在“设置”应用中使用 Facebook 登录时才授予对 Facebook 帐户的访问权限。

// Required includes
@import Accounts;
@import Social;

// Getting email
ACAccountStore *theStore = [ACAccountStore new];
ACAccountType *theFBAccountType = [theStore accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierFacebook];
NSDictionary *theOptions = @{
    ACFacebookAppIdKey : @"YOUR_APP_ID",
    ACFacebookPermissionsKey : @[@"email"]
};
[theStore requestAccessToAccountsWithType:theFBAccountType options:theOptions completion:^(BOOL granted, NSError *error) {
    if (granted) {
        ACAccount *theFBAccount = [theStore accountsWithAccountType:theFBAccountType].lastObject;

        SLRequest *request = [SLRequest requestForServiceType:SLServiceTypeFacebook
                                                requestMethod:SLRequestMethodGET
                                                          URL:[NSURL URLWithString:@"https://graph.facebook.com/me"]
                                                   parameters:@{@"fields" : @[@"email"]}];
        request.account = theFBAccount;

        [request performRequestWithHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
            if (error == nil && ((NSHTTPURLResponse *)response).statusCode == 200) {
                NSError *deserializationError;
                NSDictionary *userData = [NSJSONSerialization JSONObjectWithData:data options:0 error:&deserializationError];

                if (userData != nil && deserializationError == nil) {
                    NSString *email = userData[@"email"];
                    NSLog(@"%@", email);
                }
            }
        }];            
    }
}];