snapshot.data在颤音中ret。在翻译包中使用

Question

我正在使用 translator for for for for for自动将字符串值转换为文本窗口中的字符串，但是我的代码不起作用，但是..只是返回 null 。

代码：

Future<String> translate(String input, String to) async {
    final translator = GoogleTranslator();
    var translation = await translator.translate(input, from: 'en', to: to);
    return translation.text;
  }

---

class TranslatedText extends StatefulWidget {
  String data;
  String to;
  TranslatedText({Key? key, required this.data, required this.to}) : super(key: key);

  @override
  State<TranslatedText> createState() => _TranslatedTextState();
}

class _TranslatedTextState extends State<TranslatedText> {
  @override
  Widget build(BuildContext context) {
    return FutureBuilder(
        future: MainController().translate(widget.data, widget.to),
        builder: (BuildContext c, AsyncSnapshot<String> snapshot) {
          return Text('${snapshot.data}');
        });
  }
}

---

TranslatedText(data: "Egg", to: "es"),

Answer 1

这是FutureBuilder的共同行为。一段时间后，它将在将来解决并返回响应（快照），因此您需要先检查快照并相应地构建代码。喜欢：

  FutureBuilder(
      future: MainController().translate(widget.data, widget.to),
      builder: (BuildContext c, AsyncSnapshot<String> snapshot) {
        if (snapshot.connectionState == ConnectionState.waiting) {
          return Center(
            child: CircularProgressIndicator(),
          );
        } else {
          if (snapshot.hasData) {
            var result = snapshot.data as String;
            return Text(result);
          } else if (snapshot.hasError) {
            return Text('An error occurred');
          } else {
            return Text('No data returned from API');
          }
        }
      });

futornbuilder doc doc