iOS Swift 获取Wi-Fi IP地址

先在桥接文件中加入 #include

     func getWiFiAddress() -> String? {
        var address : String?
        
        // Get list of all interfaces on the local machine:
        var ifaddr : UnsafeMutablePointer = 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 addr = interface.ifa_addr.memory
                        var hostname = [CChar](count: Int(NI_MAXHOST), repeatedValue: 0)
                        getnameinfo(&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
    }