如何快速获取Ip地址

原来在讨论中,OP需要Mac上的界面地址,而不是像我以前想的那样在iOS设备上.问题中引用的代码检查
接口名称“en0”,这是iPhone上的WiFi接口.在Mac上,它使得更多
意思是检查任何“正在运行”界面.
所以我改写了答案.现在是Swift的代码翻译
Detect any connected network.

getifaddrs()定义在< ifaddrs.h>中,默认情况下不包括.
因此,您必须创建一个桥接头并添加

#include <ifaddrs.h>

以下函数返回
具有所有本地“正在运行”网络接口名称的阵列.

func getIFAddresses() -> [String] {
    var addresses = [String]()

    // Get list of all interfaces on the local machine:
    var ifaddr : UnsafeMutablePointer<ifaddrs> = nil
    if getifaddrs(&ifaddr) == 0 {

        // For each interface ...
        var ptr = ifaddr
        while ptr != nil {
            defer { ptr = ptr.memory.ifa_next } 

            let flags = Int32(ptr.memory.ifa_flags)
            var addr = ptr.memory.ifa_addr.memory

            // Check for running IPv4,IPv6 interfaces. Skip the loopback interface.
            if (flags & (IFF_UP|IFF_RUNNING|IFF_LOOPBACK)) == (IFF_UP|IFF_RUNNING) {
                if addr.sa_family == UInt8(AF_INET) || addr.sa_family == UInt8(AF_INET6) {

                    // Convert interface address to a human readable string:
                    var hostname = [CChar](count: Int(NI_MAXHOST),repeatedValue: 0)
                    if (getnameinfo(&addr,socklen_t(addr.sa_len),&hostname,socklen_t(hostname.count),nil,socklen_t(0),NI_NUMERICHOST) == 0) {
                        if let address = String.fromCString(hostname) {
                            addresses.append(address)
                        }
                    }
                }
            }
        }
        freeifaddrs(ifaddr)
    }

    return addresses
}

Swift 3的更新：除了采用代码
many changes in Swift 3,
所有接口的迭代现在可以使用新的泛化
sequence()功能：

func getIFAddresses() -> [String] {
    var addresses = [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)
        var addr = ptr.pointee.ifa_addr.pointee

        // Check for running IPv4,IPv6 interfaces. Skip the loopback interface.
        if (flags & (IFF_UP|IFF_RUNNING|IFF_LOOPBACK)) == (IFF_UP|IFF_RUNNING) {
            if addr.sa_family == UInt8(AF_INET) || addr.sa_family == UInt8(AF_INET6) {

                // Convert interface address to a human readable string:
                var hostname = [CChar](repeating: 0,count: Int(NI_MAXHOST))
                if (getnameinfo(&addr,NI_NUMERICHOST) == 0) {
                    let address = String(cString: hostname)
                    addresses.append(address)
                }
            }
        }
    }

    freeifaddrs(ifaddr)
    return addresses
}