Facebook 登录后检索朋友的个人资料图像

我正在寻找关于如何使用Facebook连接的想法。我可以通过点击Facebook连接按钮访问Facebook。我写的方法是：

-(void)login
{
    NSMutableDictionary *params=[NSMutableDictionary dictionary];
    [params setValue:apiString forKey:@"client_id"];
    [_facebook setSessionDelegate:self];
    [_facebook dialog:@"oauth" andParams:params andDelegate:self];

}
-(void)fbDidLogin
{enter code here
    NSMutableDictionary* params = [NSMutableDictionary dictionaryWithObjectsAndKeys: @"4", @"uids", @"name", @"fields", nil];
    [_facebook requestWithMethodName: @"users.getInfo" andParams: params andHttpMethod: @"GET" andDelegate: self];
    [_facebook requestWithGraphPath:@"me/friends" andDelegate:self];
}

- (void)request:(FBRequest *)request didReceiveResponse:(NSURLResponse *)response {
    NSLog(@"received response");
    }

- (void)request:(FBRequest *)request didLoad:(id)result// This method i am using to access all friends name and id after loging.
 {
    if ([result isKindOfClass:[NSArray class]]) {

            result = [result objectAtIndex:0];
          }
NSLog(@"%@" ,result);
}

现在我的要求是，使用朋友的名字，我需要访问他们的个人资料imag。 如何获取朋友的个人资料图像

我正在使用JSON访问Facebook connect。

/userid/picture另请参见