说下cookie，cookie在webView需要登录的时候，webView会根据这个cookie，自动登录：

    NSArray * cookieArr = [[NSHTTPCookieStorage sharedHTTPCookieStorage]cookies];//获取cookie
    for (NSHTTPCookie * cookie in array) {          //遍历cookie
      [cookie name]//输出所有cookie的key
      [cookie value]//输出所有cookie的value
    }

由于我这是从后台获得的cookie，要想当遇到网页的时候，让网页自动读取cookie，我要先把它加入cookie中
把从后台获取的cookie加入到系统的cookie队列：

由于后台传过来的是一个字典，{cookieName:name,cookiePasswd:passed}

NSMutableDictionary * cookiePreperties = [NSMutableDictionary dictionary];
[cookiePreperties setObject:@"cookieName" forKey:NSHTTPCookieName];
[cookiePreperties setObject:name forKey:NSHTTPCookieValue];
[cookiePreperties setObject:@"http://" forKey:NSHTTPCookieDomain];//http后面跟需要cookie登录的那个网址
[cookiePreperties setObject:@"http://" forKey:NSHTTPCookieOriginURL];
[cookiePreperties setObject:@"/" forKey:NSHTTPCookiePath];
[cookiePreperties setObject:@"0" forKey:NSHTTPCookieVersion];
NSHTTPCookie * cookie = [NSHTTPCookie cookieWithProperties:cookiePreperties];
            
NSMutableDictionary * cookiePrepertiess = [NSMutableDictionary dictionary];
[cookiePrepertiess setObject:@"cookiePasswd" forKey:NSHTTPCookieName];
[cookiePrepertiess setObject:passwd forKey:NSHTTPCookieValue];
[cookiePrepertiess setObject:@"http://" forKey:NSHTTPCookieDomain];
[cookiePrepertiess setObject:@"http://" forKey:NSHTTPCookieOriginURL];
[cookiePrepertiess setObject:@"/" forKey:NSHTTPCookiePath];
[cookiePrepertiess setObject:@"0" forKey:NSHTTPCookieVersion];
NSHTTPCookie * cookies = [NSHTTPCookie cookieWithProperties:cookiePrepertiess];

[[NSHTTPCookieStorage sharedHTTPCookieStorage]setCookie:cookie];
[[NSHTTPCookieStorage sharedHTTPCookieStorage]setCookie:cookies];

然后在输出cookie，其中就有加进去的那对cookie；
添加了cookie就有读取cookie：

    NSString *userstring;
    NSString * passString;
    NSMutableArray *  cookArray = [[NSMutableArray alloc]init];
    NSArray * array = [[NSHTTPCookieStoragesharedHTTPCookieStorage]cookies];
    //输出cookie
    for (NSHTTPCookie * cookie in array) {
       [cookArray addObject:[cookie name]];
      if ([[cookie name] isEqualToString:@"cookieName"]) {
       userstring = [cookie value];
      }if ([[cookie name] isEqualToString:@"cookiePasswd"]) {
       passString = [cookie value];
      }
    }

    //添加cookie，用户名
    NSArray * heardCookie = [NSHTTPCookie cookiesWithResponseHeaderFields:[NSDictionary
    dictionaryWithObject:[[NSString alloc] 
    initWithFormat:@"cookieName=%@", userstring] //这里的cookieName要后台给
    forKey:@"Set-Cookie"] 
    forURL:[NSURL URLWithString:@"http://"]];

    [[NSHTTPCookieStorage sharedHTTPCookieStorage]setCookies:heardCookie forURL:[NSURL URLWithString:@"http://"] mainDocumentURL:nil];

    //passwd
    NSArray * heardCookie = [NSHTTPCookie cookiesWithResponseHeaderFields:[NSDictionary 
    dictionaryWithObject:[[NSString alloc] 
    initWithFormat:@"cookiePasswd =%@", passString] //cookiePasswd也是后台给
    forKey:@"Set-Cookie"] 
    forURL:[NSURL URLWithString:@"http://"]];

    [[NSHTTPCookieStorage sharedHTTPCookieStorage]setCookies:heardCookie forURL:[NSURL URLWithString:@"http://"] mainDocumentURL:nil];

end