This example shows how to retrieve the local IP address of an iOS device, specifically the Wi-Fi connection interface labeled “en0.” The code iterates through the system’s network interfaces using the `getifaddrs` function, filtering for IPv4 (`AF_INET`) addresses. It returns the address as an `NSString` using `inet_ntoa`, or “error” if no matching interface is found. The implementation relies on the `ifaddrs` structure and Foundation’s `NSString` utilities, with memory freed via `freeifaddrs`.