iphone - 如何在iphone集成中注销foursquare？

Question

如何在 iPhone 集成应用程序中实现该功能？foursquare Logout

我试过这段代码。但它不起作用。

NSHTTPCookie *cookie;
NSHTTPCookieStorage *storage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
for (cookie in [storage cookies])
{

    NSString *domainName = [cookie domain];
    NSRange domainRange = [domainName rangeOfString:@"https://foursquare.com/"];
    if(domainRange.length > 0)
    {
        [storage deleteCookie:cookie];


    }

}