USB 摄像头适配iPadOS17+ios端的配置

packages/usb_camera_android/ios/Classes/UsbCameraAndroidPlugin.swift

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+//
+//  UsbCameraAndroidPlugin.swift
+//  usb_camera_android
+//
+//  Flutter iOS 插件入口：注册 MethodChannel / EventChannel / PlatformView，
+//  通道名与 Android 端完全一致，上层 Dart 无需区分平台。
+//
+
+import Flutter
+import UIKit
+
+public class UsbCameraAndroidPlugin: NSObject, FlutterPlugin, FlutterStreamHandler {
+
+    private static let METHOD_CHANNEL = "com.maibu.usb_camera_android/methods"
+    private static let EVENT_CHANNEL = "com.maibu.usb_camera_android/events"
+    private static let VIEW_TYPE = "com.maibu.usb_camera_android/preview"
+
+    private let engine = UsbCameraEngine()
+
+    public static func register(with registrar: FlutterPluginRegistrar) {
+        let instance = UsbCameraAndroidPlugin()
+
+        let methodChannel = FlutterMethodChannel(
+            name: METHOD_CHANNEL, binaryMessenger: registrar.messenger())
+        registrar.addMethodCallDelegate(instance, channel: methodChannel)
+
+        let eventChannel = FlutterEventChannel(
+            name: EVENT_CHANNEL, binaryMessenger: registrar.messenger())
+        eventChannel.setStreamHandler(instance)
+
+        registrar.register(UsbCameraViewFactory(engine: instance.engine),
+                           withId: VIEW_TYPE)
+
+        instance.engine.startMonitoring()
+    }
+
+    // MARK: - FlutterStreamHandler（转发给 engine）
+
+    public func onListen(withArguments arguments: Any?,
+                         eventSink events: @escaping FlutterEventSink) -> FlutterError? {
+        return engine.onListen(withArguments: arguments, eventSink: events)
+    }
+
+    public func onCancel(withArguments arguments: Any?) -> FlutterError? {
+        return engine.onCancel(withArguments: arguments)
+    }
+
+    // MARK: - MethodCallHandler
+
+    public func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
+        switch call.method {
+        case "isSupported":
+            result(engine.isSupported())
+        case "getDeviceList":
+            result(engine.getDeviceList())
+        case "getSupportedResolutions":
+            result(engine.getSupportedResolutions())
+        case "getPreviewSize":
+            result(engine.getPreviewSize())
+        case "open":
+            let args = call.arguments as? [String: Any]
+            engine.open(deviceId: args?["deviceId"] as? String,
+                        resolution: args?["resolution"] as? String,
+                        result: result)
+        case "close":
+            engine.close(result: result)
+        case "setResolution":
+            let args = call.arguments as? [String: Any]
+            engine.setResolution(args?["resolution"] as? String, result: result)
+        default:
+            result(FlutterMethodNotImplemented)
+        }
+    }
+}