一、获取当前连接的wifi网络获取IP地址

 // 获取当前wifi的IP地址
    func getLocalIPAddressForCurrentWiFi() -> String? {
        var address: String?
        
        // get list of all interfaces on the local machine
        var ifaddr: UnsafeMutablePointer<ifaddrs>? = nil
        guard getifaddrs(&ifaddr) == 0 else {
            return nil
        }
        guard let firstAddr = ifaddr else {
            return nil
        }
        for ifptr in sequence(first: firstAddr, next: { $0.pointee.ifa_next }) {
            
            let interface = ifptr.pointee
            
            // Check for IPV4 or IPV6 interface
            let addrFamily = interface.ifa_addr.pointee.sa_family
            if addrFamily == UInt8(AF_INET) || addrFamily == UInt8(AF_INET6) {
                // Check interface name
                let name = String(cString: interface.ifa_name)
                if name == "en0" {
                    
                    // Convert interface address to a human readable string
                    var addr = interface.ifa_addr.pointee
                    var hostName = [CChar](repeating: 0, count: Int(NI_MAXHOST))
                    getnameinfo(&addr, socklen_t(interface.ifa_addr.pointee.sa_len), &hostName, socklen_t(hostName.count), nil, socklen_t(0), NI_NUMERICHOST)
                    address = String(cString: hostName)
                }
            }
        }

        freeifaddrs(ifaddr)
        return address
    }

二、根据URL域名从DNS Query获取域名IP地址

// 根据网址请求 获取IP地址, 如传 www.baidu.com
    func getIPAddressFromDNSQuery(url: String) -> String? {
        let host = CFHostCreateWithName(nil, url as CFString).takeRetainedValue()
        CFHostStartInfoResolution(host, .addresses, nil)
        var success: DarwinBoolean =  false
        if let address = CFHostGetAddressing(host, &success)?.takeUnretainedValue() as NSArray?, let theAddress = address.firstObject as? NSData {
            var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))
            if getnameinfo(theAddress.bytes.assumingMemoryBound(to: sockaddr.self), socklen_t(theAddress.length), &hostname, socklen_t(hostname.count), nil, 0, NI_NUMERICHOST) == 0 {
                let numAddress = String(cString: hostname)
                return numAddress
            }
            return nil
        }
        
        return nil
    }

//  获取所有的IP Adress
let host = CFHostCreateWithName(nil,"www.google.com" as CFString).takeRetainedValue()
CFHostStartInfoResolution(host, .addresses, nil)
var success: DarwinBoolean = false
if let addresses = CFHostGetAddressing(host, &success)?.takeUnretainedValue() as NSArray? {
    for case let theAddress as NSData in addresses {
        var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))
        if getnameinfo(theAddress.bytes.assumingMemoryBound(to: sockaddr.self), socklen_t(theAddress.length),
                       &hostname, socklen_t(hostname.count), nil, 0, NI_NUMERICHOST) == 0 {
            let numAddress = String(cString: hostname)
            print(numAddress)
        }
    }
}

共勉。