objective c - not deleting cookie (iphone) -

        nshttpcookiestorage *storage = [nshttpcookiestorage sharedhttpcookiestorage];          nsarray *cookies = [storage cookiesforurl:[nsurl urlwithstring:@"http://www.facebook.com/"]];         nslog(@"old cookies!: %@",cookies);         nshttpcookie *cookie;         (cookie in [storage cookies]) {             [storage deletecookie:cookie];         }         nslog(@"new cookies!: %@",cookies); 

i trying delete facebook cookie in logout function no cookies deleted. not understand why. appreciated.

if want changes nshttpcookiestorage retained, you'll want synchronize standarduserdefaults after modifying cookie store:

[[nsuserdefaults standarduserdefaults] synchronize]; 

to prevent slowing down app, may want call on background thread so:

dispatch_queue_t backgroundqueue = dispatch_get_global_queue(dispatch_queue_priority_background, 0);  dispatch_async(backgroundqueue, ^{     //todo: cookie deletion logic here }); 

edit:

if need disregard cookies altogether given nsurlrequest, can with:

[request sethttpshouldhandlecookies:no]; 

where request instance of nsurlrequest.