Ios 如何获取Facebook用户的验证状态

我下载了HelloFacebookSample，使用Facebook SDK for iOS从用户帐户中检索已验证的状态

我试图用下面的方法从用户实例中检索。但它似乎没有定义
在那里

如何检索已验证的状态

- (void)loginViewFetchedUserInfo:(FBLoginView *)loginView
                            user:(id<FBGraphUser>)user {
    // here we use helper properties of FBGraphUser to dot-through to first_name and
    // id properties of the json response from the server; alternatively we could use
    // NSDictionary methods such as objectForKey to get values from the my json object
    self.labelFirstName.text = [NSString stringWithFormat:@"Hello %@!", user.first_name];
    // setting the profileID property of the FBProfilePictureView instance
    // causes the control to fetch and display the profile picture for the user
    self.profilePic.profileID = user.id;
    self.loggedInUser = user;
}

-（无效）loginView蚀刻教育信息：（FBLoginView*）loginView
用户：（id）用户{
//在这里，我们使用FBGraphUser的助手属性点到first_name和
//来自服务器的json响应的id属性；或者我们可以使用
//NSDictionary方法，如objectForKey，用于从MyJSON对象获取值
self.labelFirstName.text=[NSString stringWithFormat:@“Hello%@！”，user.first_name]；
//设置FBProfilePictureView实例的profileID属性
//使控件获取并显示用户的配置文件图片
self.profilePic.profileID=user.id；
self.loggedInUser=用户；
}

我得到了答案：

- (void)loginViewFetchedUserInfo:(FBLoginView *)loginView
                            user:(id<FBGraphUser>)user {
    // here we use helper properties of FBGraphUser to dot-through to first_name and
    // id properties of the json response from the server; alternatively we could use
    // NSDictionary methods such as objectForKey to get values from the my json object
    self.labelFirstName.text = [NSString stringWithFormat:@"Hello %@!", user.first_name];
    // setting the profileID property of the FBProfilePictureView instance
    // causes the control to fetch and display the profile picture for the user
    self.profilePic.profileID = user.id;
    self.loggedInUser = user;

    NSLog(@"userInfo %@",[user objectForKey:@"verified"]);

}

-（无效）loginView蚀刻教育信息：（FBLoginView*）loginView
用户：（id）用户{
//在这里，我们使用FBGraphUser的助手属性点到first_name和
//来自服务器的json响应的id属性；或者我们可以使用
//NSDictionary方法，如objectForKey，用于从MyJSON对象获取值
self.labelFirstName.text=[NSString stringWithFormat:@“Hello%@！”，user.first_name]；
//设置FBProfilePictureView实例的profileID属性
//使控件获取并显示用户的配置文件图片
self.profilePic.profileID=user.id；
self.loggedInUser=用户；
NSLog（@“userInfo%@，[user objectForKey:@“verified”]）；
}

我得到了答案：

- (void)loginViewFetchedUserInfo:(FBLoginView *)loginView
                            user:(id<FBGraphUser>)user {
    // here we use helper properties of FBGraphUser to dot-through to first_name and
    // id properties of the json response from the server; alternatively we could use
    // NSDictionary methods such as objectForKey to get values from the my json object
    self.labelFirstName.text = [NSString stringWithFormat:@"Hello %@!", user.first_name];
    // setting the profileID property of the FBProfilePictureView instance
    // causes the control to fetch and display the profile picture for the user
    self.profilePic.profileID = user.id;
    self.loggedInUser = user;

    NSLog(@"userInfo %@",[user objectForKey:@"verified"]);

}

-（无效）loginView蚀刻教育信息：（FBLoginView*）loginView
用户：（id）用户{
//在这里，我们使用FBGraphUser的助手属性点到first_name和
//来自服务器的json响应的id属性；或者我们可以使用
//NSDictionary方法，如objectForKey，用于从MyJSON对象获取值
self.labelFirstName.text=[NSString stringWithFormat:@“Hello%@！”，user.first_name]；
//设置FBProfilePictureView实例的profileID属性
//使控件获取并显示用户的配置文件图片
self.profilePic.profileID=user.id；
self.loggedInUser=用户；
NSLog（@“userInfo%@，[user objectForKey:@“verified”]）；
}

我使用此项获得空值。我们需要添加任何额外的登录权限吗？我使用此项获得空值。我们需要添加任何额外的登录权限吗？