Get IPAddress of iPhone or iPad device Using Swift 3 [duplicate]

Question

How to retrieve the device's IP address without using any third-party libraries using Swift 3 programming language? I have used the following code in order to get the IP address:

func getIPAddress() -> String? {
    var address : String?

    var ifaddr : UnsafeMutablePointer<ifaddrs> = nil
    if getifaddrs(&ifaddr) == 0 {

        var ptr = ifaddr
        while ptr != nil {
            defer { ptr = ptr.memory.ifa_next }

            let interface = ptr.memory

            let addrFamily = interface.ifa_addr.memory.sa_family
            if addrFamily == UInt8(AF_INET) || addrFamily == UInt8(AF_INET6) {

                if let name = String.fromCString(interface.ifa_name) where name == "en0" {

                    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
 }

But the UnsafeMutablePointer<ifaddrs> syntax is not working. It throws a syntax error. Do I need to import a framework to try to help me?

Answer 1

I did following things in order to get the exact IP address of the device. Since I want to include the updated code to get IP address using Swift 3, I am posting the answer here. Referred from Swift - Get device's IP Address

1. Add #include<ifaddrs.h> in your bridging header

2. Create following function in order to get the IP Address.

   func getIP()-> String? {  
   
   var address: String?
   var ifaddr: UnsafeMutablePointer<ifaddrs>? = nil
   if getifaddrs(&ifaddr) == 0 {
   
       var ptr = ifaddr
       while ptr != nil {
           defer { ptr = ptr?.pointee.ifa_next } // memory has been renamed to pointee in swift 3 so changed memory to pointee
   
           let interface = ptr?.pointee
           let addrFamily = interface?.ifa_addr.pointee.sa_family
           if addrFamily == UInt8(AF_INET) || addrFamily == UInt8(AF_INET6) {
   
               if let name: String = String(cString: (interface?.ifa_name)!), name == "en0" {  // String.fromCString() is deprecated in Swift 3. So use the following code inorder to get the exact IP Address.
                   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
   }
   

3. In order to get the IP Address, print(getIP())

For verification: -> Goto Settings -> Wi-Fi -> Click i symbol -> you can check your device IP Address.

OUTPUT SCREENSHOT: