根据多个SO线程（例如，iOS网络接口名称的确切含义是什么？pdp_ip是什么？ap是什么？），iOS设备上的WiFi接口始终具有名称“ en0”。
您的代码（这似乎是我在“ 如何迅速获取IP地址”中回答的内容）检索 所有 正在运行的网络接口的IP地址的列表。可以轻松地修改它，使其仅返回“en0”接口的IP地址，而实际上这正是我 最初 在该线程处回答的（这只是对[如何以编程方式获取iphoneip地址的回答的快速翻译。）：
// Return IP address of WiFi interface (en0) as a String, or `nil`func getWiFiAddress() -> String? { var address : 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 interface = ptr.memory // Check for IPv4 or IPv6 interface: let addrFamily = interface.ifa_addr.memory.sa_family if addrFamily == UInt8(AF_INET) || addrFamily == UInt8(AF_INET6) { // Check interface name: if let name = String.fromCString(interface.ifa_name) where name == "en0" { // Convert interface address to a human readable string: var hostname = [CChar](count: Int(NI_MAXHOST), repeatedValue: 0) getnameinfo(interface.ifa_addr, socklen_t(interface.ifa_addr.memory.sa_len), &hostname, socklen_t(hostname.count), nil, socklen_t(0), NI_NUMERICHOST) address = String.fromCString(hostname) } } } freeifaddrs(ifaddr) } return address}用法：
if let addr = getWiFiAddress() { print(addr)} else { print("No WiFi address")}Swift 3的更新： 除了 对Swift 3 的许多更改采用代码之外 ，对所有接口进行迭代现在还可以使用新的通用
sequence()函数：
千万 不要 忘记添加
#include <ifaddrs.h>在你的桥接报
// Return IP address of WiFi interface (en0) as a String, or `nil`func getWiFiAddress() -> String? { var address : String? // Get list of all interfaces on the local machine: var ifaddr : UnsafeMutablePointer<ifaddrs>? guard getifaddrs(&ifaddr) == 0 else { return nil } guard let firstAddr = ifaddr else { return nil } // For each interface ... 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 hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST)) getnameinfo(interface.ifa_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}对于那些想要寻找比WIFI IP更多的人，您可以修改一下此代码
func getAddress(for network: Network) -> String? { var address: String? // Get list of all interfaces on the local machine: var ifaddr: UnsafeMutablePointer<ifaddrs>? guard getifaddrs(&ifaddr) == 0 else { return nil } guard let firstAddr = ifaddr else { return nil } // For each interface ... 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 == network.rawValue { // Convert interface address to a human readable string: var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST)) getnameinfo(interface.ifa_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}enum Network: String { case wifi = "en0" case cellular = "pdp_ip0" //... case ipv4 = "ipv4" //... case ipv6 = "ipv6"}然后，我们也可以访问蜂窝IP。
guard let wifiIp = getAddress(for: .wifi) else { return }和
guard let cellularIp = getAddress(for: .cellular) else { return }
