ios 检查网络

// 检测网络
    if (([[Reachability reachabilityForLocalWiFi] currentReachabilityStatus] == NotReachable)
        && ([[Reachability reachabilityForInternetConnection] currentReachabilityStatus] == NotReachable))
  {
       
  //网络目前不可用，提示用户
  }