Правильный и работающий способ проверки соединения к сети

Reachability.swift

import SystemConfiguration

class Reachability {
    
    class func isConnectedToNetwork() -> Bool {
        var zeroAddress = sockaddr_in()
        zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
        zeroAddress.sin_family = sa_family_t(AF_INET)
        guard let defaultRouteReachability = withUnsafePointer(&zeroAddress, {
            SCNetworkReachabilityCreateWithAddress(nil, UnsafePointer($0))
        }) else {return false}
        var flags : SCNetworkReachabilityFlags = []
        if !SCNetworkReachabilityGetFlags(defaultRouteReachability, &flags) {return false}
        let isReachable = flags.contains(.Reachable)
        let needsConnection = flags.contains(.ConnectionRequired)
        return (isReachable && !needsConnection)
    } // isConnectedToNetwork

} // class Reachability

/*
 if Reachability.isConnectedToNetwork() == true {
    print("Internet connection OK")
 } else {
    print("Internet connection FAILED")
 }
*/