通过状态栏获取网络状态

// MARK: -
// MARK: -  判断网络类型
enum NetworkStatuses {
    case NetworkStatusNone  // 没有网络
    case NetworkStatus2G     // 2G
    case NetworkStatus3G     // 3G
    case NetworkStatus4G     // 4G
    case NetworkStatusWIFI   // WIFI
}

extension NetWorkTools {
     /// 获取网络状态
     class func getNetworkStates() -> NetworkStatuses? {
        guard let object1 = UIApplication.shared.value(forKey: "statusBar") as? NSObject else { return nil }
        guard let object2 = object1.value(forKey: "foregroundView") as? UIView else { return nil }
        let subviews = object2.subviews

        var status = NetworkStatuses.NetworkStatusNone
        
        for child in subviews {
            if child.isKind(of: NSClassFromString("UIStatusBarDataNetworkItemView")!) {
                // 获取到状态栏码
                 guard let networkType = child.value(forKey: "dataNetworkType") as? Int else { return nil }
                switch (networkType) {
                    case 0: // 无网模式
                        status =  NetworkStatuses.NetworkStatusNone;
                    case 1: // 2G模式
                        status =  NetworkStatuses.NetworkStatus2G;
                    case 2: // 3G模式
                        status =  NetworkStatuses.NetworkStatus3G;
                    case 3: // 4G模式
                        status =  NetworkStatuses.NetworkStatus4G;
                    case 5: // WIFI模式
                        status =  NetworkStatuses.NetworkStatusWIFI;
                    default:
                        break
                }
            }
        }
        
        // 返回网络类型
        return status;
    }
}

需要注意的是
当连接的wifi没有网络时候
会出现问题
所以还是推荐用网络监听器来获取网络状态
这个主要是用来判断是2G/3G/4G网络用的