facebook ios sdk 无法登出bug的解决方法

先说下facebook ios sdk中如何不跳到safari而在程序内登陆

NSArray* facebookCookies1 = [cookies cookiesForURL:                                [NSURL URLWithString:@"https://login.facebook.com"]];        for (NSHTTPCookie* cookie in facebookCookies1) {        [cookies deleteCookie:cookie];    }