iOS保存cookie的方法

SURLRequest*request =[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.google.com/"]];
NSURLConnection*connection =[NSURLConnection connectionWithRequest:request delegate:self];
-(void)connection:(NSURLConnection*)connection didReceiveResponse:(NSURLResponse*)response
{
    NSHTTPURLResponse*HTTPResponse=(NSHTTPURLResponse*)response;
    NSDictionary*fields =[HTTPResponse allHeaderFields];
    NSString*cookie =[fields valueForKey:"Set-Cookie"];// It is your cookie
}
//保存好Cookie，当另一个request要用到这个cookies时，用如下方法加入：
NSMutableURLRequest*request =[NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://www.google.com/"]];
[request addValue:cookie forHTTPHeaderField:"Cookie"];