带缓存的POST请求

• (void)cachenetworkWithURL: (NSString *)urlString
  parameter: (NSDictionary *)paraDic
  susccess: (void(^)(id obj)) succeee
  fail:(void(^)(NSError *error))fail{

  // NSURLSession 配置
  NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
  //创建 sessionManager
  AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:configuration];
  //创建请求
  NSMutableURLRequest *request = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@”POST” URLString:urlString parameters:paraDic constructingBodyWithBlock:nil error:nil];
  //创建请求任务
  NSURLSessionDataTask dataTask = [manager dataTaskWithRequest:request completionHandler:^(NSURLResponse _Nonnull response, id _Nullable responseObject, NSError * _Nullable error) {

  //缓存文件路径
  NSString *cachePath = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject] stringByAppendingString:urlString.md5];
  
  //如果有 error , 请求失败
  //反之, 请求成功
  if (error) {
      NSLog(@"网络请求失败");
  
      //请求失败, 从本地把缓存数据取出
      id obj = [NSDictionary dictionaryWithContentsOfFile:cachePath];
      if (obj) {
          succeee(obj[@"data"]);
      }else{
          fail(error);
      }
  
  } else {
      //把object存储到本地
      //读写
      [@{@"data": responseObject} writeToFile:cachePath atomically:YES];
      succeee(responseObject);
  
  }
  

  }];
  //开启任务
  [dataTask resume];

}