小编Ali*_*iri的帖子

我正在尝试找到一种方法来查看我的 flutter web 项目正在哪个平台（iOS 或 Android）上运行。当我使用时if (Platform.isIOS) { //do something }，我遇到以下错误：

Error: Unsupported operation: Platform._operatingSystem
at Object.throw_ [as throw] (http://localhost:44159/dart_sdk.js:4334:11)
at Function._operatingSystem (http://localhost:44159/dart_sdk.js:55064:17)
at Function.get operatingSystem [as operatingSystem] (http://localhost:44159/dart_sdk.js:55110:27)
at get _operatingSystem (http://localhost:44159/dart_sdk.js:55023:27)
at Function.desc.get [as _operatingSystem] (http://localhost:44159/dart_sdk.js:4819:15)
at get isIOS (http://localhost:44159/dart_sdk.js:55047:26)
at Function.desc.get [as isIOS] (http://localhost:44159/dart_sdk.js:4819:15)
at http://localhost:44159/packages/itoll/main.dart.lib.js:364:33
at wrapper (http://localhost:44159/dart_sdk.js:59904:30)
at http://localhost:44159/:70:11123

有办法吗？

谢谢。

我想在 flutter 中编写特定于平台的代码，根据 flutter 文档，我们应该重写configureFlutterEngine方法，如下面的代码片段：

override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
    GeneratedPluginRegistrant.registerWith(flutterEngine)
    MethodChannel(flutterEngine.dartExecutor.binaryMessenger, CHANNEL).setMethodCallHandler {
      call, result ->
      // Note: this method is invoked on the main thread.
      // TODO
    }
  }

但是当我将flutterEngine传递给generatedPluginRegistrant.registerWith()时，它说：

类型不匹配：推断类型为 FlutterEngine，但为 PluginRegistry！预计

我已经检查了 github 中下面的链接，但没有找到任何适合我的解决方案。 https://github.com/flutter/flutter/issues/45231

这是用于编写特定于平台的代码的 flutter 文档的链接。 https://flutter.dev/docs/development/platform-integration/platform-channels?tab=android-channel-kotlin-tab#example-project