无法将cookies发送到WebView Objective C

NSHTTPCookie *cookie = [NSHTTPCookie cookieWithProperties:@{NSHTTPCookieName: @"cookieName", NSHTTPCookieValue: @"cookieValue", NSHTTPCookieDomain: @"example.com", NSHTTPCookiePath: @"/"}];

[[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookie:cookie];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"https://example.com"]];
[[NSHTTPCookieStorage sharedHTTPCookieStorage] setCookies:[[NSHTTPCookieStorage sharedHTTPCookieStorage] cookiesForURL:request.URL] forURL:request.URL mainDocumentURL:nil];
[webView loadRequest:request];