iOS应用及PHP服务端如何通过HTTP请求（非定位）获取实际国家？

Absolutely feasible! You don’t need to request location permissions at all—here are practical approaches for both your iOS app and PHP backend:

iOS App-side Solutions #

• Leverage system locale settings
  iOS provides direct access to the user’s configured region and language through the Locale API. You can grab the country code with Locale.current.regionCode (returns values like "US"), and the language code with Locale.current.languageCode (e.g., "EN"). Combine them to form your desired format, such as US-EN.
  Note: This relies on the user’s manual system settings, which might not match their actual physical location if they’ve set a different region intentionally.

• Fetch country via IP geolocation API
  Send a simple HTTP GET request from the app to an IP geolocation service (no location data needed—only the device’s public IP). The service will return the country associated with that IP address.
  Example Swift code snippet:

  let url = URL(string: "https://ipapi.co/json/")!
  URLSession.shared.dataTask(with: url) { data, response, error in
      guard let data = data else { return }
      if let json = try? JSONSerialization.jsonObject(with: data) as? [String: Any],
         let countryCode = json["country_code"] as? String,
         let languageCode = Locale.current.languageCode {
          let identifier = "\(countryCode)-\(languageCode)"
          // Use the identifier in your app logic
      }
  }.resume()
  

  Caveat: IP-based geolocation isn’t 100% accurate (e.g., if the user is on a VPN, you’ll get the VPN server’s country), but it’s the closest you can get to physical location without using GPS.

PHP Backend Solutions #

• Map client IP to country
  In your PHP service, retrieve the client’s public IP using $_SERVER['REMOTE_ADDR'] (or $_SERVER['HTTP_X_FORWARDED_FOR'] if your server is behind a proxy). Then use an IP geolocation database (like MaxMind’s GeoIP2) or a third-party API to look up the corresponding country code.
  You can also parse the Accept-Language request header to get the user’s preferred language/region, then combine it with the IP-derived country code.
  Example PHP snippet:

  // Get client IP address
  $ip = $_SERVER['REMOTE_ADDR'];
  // Assume you have a function to fetch country code from IP
  $countryCode = getCountryFromIP($ip); // Implement this with your chosen service
  // Parse preferred language from request header
  $acceptLanguage = $_SERVER['HTTP_ACCEPT_LANGUAGE'];
  $languageCode = substr($acceptLanguage, 0, 2); // Simplified parsing example
  // Form the target identifier
  $identifier = "$countryCode-$languageCode";
  

Best Practice #

For better reliability, consider combining both approaches: use IP geolocation as the primary source, and fall back to the user’s system locale if the IP lookup fails or returns uncertain data.

内容的提问来源于stack exchange，提问作者Allen Walker