Apple基础（Xcode④-Flutter-Platform Channels）

✅ Swift 端（iOS）

在 ios/Runner/AppDelegate.swift 里加几行：

let channel = FlutterMethodChannel(name: "myapp/channel", binaryMessenger: controller.binaryMessenger)

channel.setMethodCallHandler { (call, result) in
  if call.method == "getX" {
    result(1) // 直接返回 x = 1
  } else if call.method == "getAnswer" {
    result(self.getAnswer()) // 调用方法
  } else {
    result(FlutterMethodNotImplemented)
  }
}

✅ Flutter 端（Dart）

const channel = MethodChannel('myapp/channel');

// 获取 x
final int x = await channel.invokeMethod('getX');
print(x); // 输出 1

// 调用方法
final String msg = await channel.invokeMethod('getAnswer');
print(msg); // 输出 Hello from Swift