Check if the device is connected to a network

Network.swift

import SystemConfiguration

/// Returns `true` if the device is connected to a network, either WiFi or Cellular (4G, 5G, etc).
///
/// [source](https://stackoverflow.com/a/39782859/584548)
func isConnectedToNetwork() -> Bool {
    var zeroAddress = sockaddr_in(
        sin_len: 0,
        sin_family: 0,
        sin_port: 0,
        sin_addr: in_addr(s_addr: 0),
        sin_zero: (0, 0, 0, 0, 0, 0, 0, 0)
    )

    zeroAddress.sin_len = UInt8(MemoryLayout.size(ofValue: zeroAddress))
    zeroAddress.sin_family = sa_family_t(AF_INET)

    let defaultRouteReachability = withUnsafePointer(to: &zeroAddress) {
        $0.withMemoryRebound(to: sockaddr.self, capacity: 1) { zeroSockAddress in
            SCNetworkReachabilityCreateWithAddress(nil, zeroSockAddress)
        }
    }

    var flags = SCNetworkReachabilityFlags(rawValue: 0)
    if SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) == false {
        return false
    }

    // Covers both Cellular and WiFi.
    let isReachable = (flags.rawValue & UInt32(kSCNetworkFlagsReachable)) != 0
    let needsConnection = (flags.rawValue & UInt32(kSCNetworkFlagsConnectionRequired)) != 0
    return (isReachable && !needsConnection)
}