system proxy & build_windows script

ios/Runner/AppDelegate.swift

@@ -7,6 +7,19 @@ import Flutter
     _ application: UIApplication,
     didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
   ) -> Bool {
+    let methodChannel = FlutterMethodChannel(name: "pixes/proxy", binaryMessenger: controller.binaryMessenger)
+    methodChannel.setMethodCallHandler { [weak self] (call: FlutterMethodCall, result: @escaping FlutterResult) -> Void in
+        if let proxySettings = CFNetworkCopySystemProxySettings()?.takeUnretainedValue() as NSDictionary?,
+           let dict = proxySettings.object(forKey: kCFNetworkProxiesHTTPProxy) as? NSDictionary,
+           let host = dict.object(forKey: kCFNetworkProxiesHTTPProxy) as? String,
+           let port = dict.object(forKey: kCFNetworkProxiesHTTPPort) as? Int {
+            let proxyConfig = "\(host):\(port)"
+            result(proxyConfig)
+        } else {
+            result("")
+        }
+    }
+
     GeneratedPluginRegistrant.register(with: self)
     return super.application(application, didFinishLaunchingWithOptions: launchOptions)
   }