获取本地的cookie,[SystemConfigure shareSystemConfigure].get_kHttpURL]留意用自己本地的域名，获取本地的登录的cookie信息

- (NSString *)accessToken {  
    NSString *token = @"";
    NSHTTPCookieStorage* cookieStorage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
    NSArray<NSHTTPCookie *> *cookies = [cookieStorage cookiesForURL:[NSURL URLWithString:[SystemConfigure shareSystemConfigure].get_kHttpURL]];
    for (NSHTTPCookie *cookie in cookies) {
        if ([cookie.name isEqualToString:@"accessToken"]) {
            token = [NSString stringWithFormat:@"%@",cookie.value];
            [[TMCache sharedCache] setObject:token forKey:kLoginTokenKey];
            break;
        }
    }
    return token;
}

设置cookie到web，注意self.startPage为你h5的链接地址，[PCUserLevelService share].accessToken为你之前保存的token

//解决cookie保存问题 h5添加cookie中accessToken
    NSHTTPCookieStorage* cookieStorage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
    NSArray<NSHTTPCookie *> *cookies = [cookieStorage cookiesForURL:[NSURL URLWithString:self.startPage]];
    [cookies enumerateObjectsUsingBlock:^(NSHTTPCookie * _Nonnull cookie, NSUInteger idx, BOOL * _Nonnull stop) {
        NSMutableDictionary *properties = [[cookie properties] mutableCopy];
        [properties setValue: [PCUserLevelService share].accessToken forKey:NSHTTPCookieValue];
        [properties setValue:@"accessToken" forKey:NSHTTPCookieName];
        //将cookie过期时间设置为一年后
        NSDate *expiresDate = [NSDate dateWithTimeIntervalSinceNow:3600*24*30*12];
        properties[NSHTTPCookieExpires] = expiresDate;
        //下面一行是关键,删除Cookies的discard字段，应用退出，会话结束的时候继续保留Cookies
        [properties removeObjectForKey:NSHTTPCookieDiscard];
        //重新设置改动后的Cookies
        [cookieStorage setCookie:[NSHTTPCookie cookieWithProperties:properties]];
    }];