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Flutter WidgetsBinding.instance.addPostFrameCallback((_)错误

朋友们大家好,首先我很抱歉我的英语不好。\n当我开始在 flutter-Dart 中调试代码时遇到错误。

\n
          import 'package:flutter/foundation.dart';\n          import 'package:flutter/material.dart';\n          import 'package:get/get.dart';\n          import 'package:http/http.dart' as http;\n\n          // Bu alan benim soru de\xc4\x9fi\xc5\x9fkenlerimi Getx yard\xc4\xb1m\xc4\xb1 ile tuttu\xc4\x9fum classd\xc4\xb1r.farkll\xc4\xb1 de\xc4\x9fi\xc5\x9fken classlar\xc4\xb1 yaz\xc4\xb1labilir.\n          class memberController extends GetxController {\n            //5 benim de\xc4\x9fikenimin ilk de\xc4\x9feridir.\n            var _memberName = "a".obs;\n            var _memberPhoto = "a".obs;\n\n            //get ile \xc3\xa7eker, set ile veriyi atar\xc4\xb1m.\n            get memberName => _memberName.value;\n            set memberName(yeniDeger) => _memberName.value = yeniDeger;\n\n            get memberPhoto => _memberPhoto.value;\n            set memberPhoto(yeniDeger) => _memberPhoto.value = yeniDeger;\n          }\n\n          void main() => runApp(MyApp());\n\n          class MyApp …
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