swift – 如何检测互联网连接是通过WiFi还是以太网？

将此添加到您的桥接标头(或根据需要创建一个)：

#include <ifaddrs.h>
#include <net/if_dl.h>

然后使用此Swift代码获取所需的信息：

struct Networking {

    enum NetworkInterfaceType: String,CustomStringConvertible {
        case Ethernet = "en0"
        case Wifi = "en1"
        case Unknown = ""

        var description: String {
            switch self {
            case .Ethernet:
                return "Ethernet"
            case .Wifi:
                return "Wifi"
            case .Unknown:
                return "Unknown"
            }
        }
    }

    static var networkInterfaceType: NetworkInterfaceType {
        if let name = Networking().getInterfaces().first?.name,let type = NetworkInterfaceType(rawValue: name) {
            return type
        }

        return .Unknown
    }

    static var isConnectedByEthernet: Bool {
        let networking = Networking()
        for addr in networking.getInterfaces() {
            if addr.name == NetworkInterfaceType.Ethernet.rawValue {
                return true
            }
        }
        return false
    }

    static var isConnectedByWiFi: Bool {
        let networking = Networking()
        for addr in networking.getInterfaces() {
            if addr.name == NetworkInterfaceType.Wifi.rawValue {
                return true
            }
        }
        return false
    }

    // Credit to Martin R https://stackoverflow.com/a/34016247/600753 for this lovely code
    // New Swift 3 implementation needed upated to replace unsafepointer calls with .withMemoryRebound
    func getInterfaces() -> [(name : String,addr: String,mac : String)] {

        var addresses = [(name : String,mac : String)]()
        var nameToMac = [ String: String ]()

        // Get list of all interfaces on the local machine:
        var ifaddr : UnsafeMutablePointer<ifaddrs>?
        guard getifaddrs(&ifaddr) == 0 else { return [] }
        guard let firstAddr = ifaddr else { return [] }

        // For each interface ...
        for ptr in sequence(first: firstAddr,next: { $0.pointee.ifa_next }) {
            let flags = Int32(ptr.pointee.ifa_flags)
            if var addr = ptr.pointee.ifa_addr {
                let name = String(cString: ptr.pointee.ifa_name)

                // Check for running IPv4,IPv6 interfaces. Skip the loopback interface.
                if (flags & (IFF_UP|IFF_RUNNING|IFF_LOOPBACK)) == (IFF_UP|IFF_RUNNING) {
                    switch Int32(addr.pointee.sa_family) {
                    case AF_LINK:
                        nameToMac[name] = withUnsafePointer(to: &addr) { unsafeAddr in
                            unsafeAddr.withMemoryRebound(to: sockaddr_dl.self,capacity: 1) { dl in
                                dl.withMemoryRebound(to: Int8.self,capacity: 1) { dll in
                                    let lladdr = UnsafeRawBufferPointer(start: dll + 8 + Int(dl.pointee.sdl_nlen),count: Int(dl.pointee.sdl_alen))

                                    if lladdr.count == 6 {
                                        return lladdr.map { String(format:"%02hhx",$0)}.joined(separator: ":")
                                    } else {
                                        return nil
                                    }
                                }
                            }
                        }

                    case AF_INET,AF_INET6:
                        // Convert interface address to a human readable string:
                        var hostname = [CChar](repeating: 0,count: Int(NI_MAXHOST))
                        if (getnameinfo(addr,socklen_t(addr.pointee.sa_len),&hostname,socklen_t(hostname.count),nil,socklen_t(0),NI_NUMERICHOST) == 0) {
                            let address = String(cString: hostname)
                            addresses.append( (name: name,addr: address,mac : "") )
                        }
                    default:
                        break
                    }
                }
            }
        }

        freeifaddrs(ifaddr)

        // Now add the mac address to the tuples:
        for (i,addr) in addresses.enumerated() {
            if let mac = nameToMac[addr.name] {
                addresses[i] = (name: addr.name,addr: addr.addr,mac : mac)
            }
        }

        return addresses
    }
}

用法是：

debugPrint(Networking.networkInterfaceType)

要么：

switch Networking.networkInterfaceType {
case .Ethernet:
    // do something
    break

case .Wifi:
    // do something else
    break

default:
    break
}