system proxy & build_windows script

macos/Runner/MainFlutterWindow.swift

@@ -1,5 +1,6 @@
 import Cocoa
 import FlutterMacOS
+import IOKit.ps
 
 class MainFlutterWindow: NSWindow {
   override func awakeFromNib() {
@@ -8,6 +9,22 @@ class MainFlutterWindow: NSWindow {
     self.contentViewController = flutterViewController
     self.setFrame(windowFrame, display: true)
 
+    let proxyChannel = FlutterMethodChannel(
+      name: "pixes/proxy",
+      binaryMessenger: flutterViewController.engine.binaryMessenger)
+    proxyChannel.setMethodCallHandler { (call, result) in
+      // 获取代理设置
+        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("No proxy")
+        }
+    }
+
     RegisterGeneratedPlugins(registry: flutterViewController)
 
     super.awakeFromNib()