Flutter报错: Getter not found: 'wordPair' in english_words. dart包

Question

我最近开始学习 flutter。我正在研究“package:english_words/english_words.dart”包。我通过在依赖项中添加 'english_words: ^3.1.0 修改 pubspec.yaml 文件成功导入它，并且在 main.dart 文件 child:Text(wordPair.asPascalCase) 上抛出错误。运行后得到的输出是:

Compiler message: lib/main.dart:17:23: Error: Getter not found: 'wordPair'.

Target kernel_snapshot failed: Exception: Errors during snapshot creation: null build failed.

FAILURE: Build failed with an exception.

• Where: Script 'C:\flutter\packages\flutter_tools\gradle\flutter.gradle' line: 780

• What went wrong: Execution failed for task ':app:compileFlutterBuildDebug'. Process 'command 'C:\flutter\bin\flutter.bat'' finished with non-zero exit value 1

这是我的代码:

import 'package:flutter/material.dart';
import 'package:english_words/english_words.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Welcome to Flutter',
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Welcome to Flutter'),
        ),
        body: const Center(
          child: Text(wordPair.asPascalCase),
        ),
      ),
    );
  }
}

我的english.dart文件是

/// Support for working with English text.
library english_words;

export 'src/syllables.dart';
export 'src/word_pair.dart';
export 'src/words/adjectives.dart';
export 'src/words/all.dart';
export 'src/words/nouns.dart';

Answer 1

该文件来自flutter包，您无需修改​​。

library english_words;

export 'src/syllables.dart';
export 'src/word_pair.dart';
export 'src/words/adjectives.dart';
export 'src/words/all.dart';
export 'src/words/nouns.dart';

问题是对english_words包的理解。使用 wordPair 没有任何意义，因为您没有声明它。

您不能使用 WordPair 的静态实例访问 asPascalCase getter。因此，您必须创建一个 WordPair 实例，然后使用 pascalCase getter。

import 'package:english_words/english_words.dart';

var wordpair = WordPair("first,", "second");    
String pascalCase = wordpair.asPascalCase;