如何从iOS上的主机名解析和IP地址

import Foundation

let hostname = "www.example.com"
let dnsResolver = CFHostCreateWithName(kCFAllocatorDefault, hostname as CFString).takeRetainedValue()
CFHostStartInfoResolution(dnsResolver, .addresses, nil)
var success: DarwinBoolean = false
if let addresses = CFHostGetAddressing(dnsResolver, &success)?.takeUnretainedValue() as? [Data] {
    for address in addresses {
        let ipAddress = address.withUnsafeBytes { pointer in
            pointer.bindMemory(to: Int8.self).map { String(cString: $0) }
        }
        print("IP address: \(ipAddress)")
    }
}

import Foundation

let url = URL(string: "https://www.example.com")!
let task = URLSession.shared.dataTask(with: url) { data, response, error in
    if let error = error {
        print("Error: \(error.localizedDescription)")
        return
    }
    guard let httpResponse = response as? HTTPURLResponse else {
        print("Error: Invalid response")
        return
    }
    let statusCode = httpResponse.statusCode
    print("Status code: \(statusCode)")
    if let data = data {
        let string = String(data: data, encoding: .utf8)
        print("Response: \(string)")
    }
}
task.resume()