Dart Flutter - 命名参数“begin”是必需的，但没有相应的参数

Question

我有这样的代码：

import 'package:custom_timer/custom_timer.dart';
import 'package:fitness/core/service/date_service.dart';
import 'package:flutter/material.dart';

class StartWorkoutTimer extends StatefulWidget {
  final int time;
  final bool isPaused;

  StartWorkoutTimer({
    required this.time,
    required this.isPaused,
  });

  @override
  _StartWorkoutTimerState createState() => _StartWorkoutTimerState();
}

class _StartWorkoutTimerState extends State<StartWorkoutTimer> {
  @override
  Widget build(BuildContext context) {
    return widget.isPaused ? _createPauseText() : _createCountdownTimer();
  }

  Widget _createCountdownTimer() {
    return CustomTimer(
      from: Duration(seconds: widget.time),
      to: Duration(seconds: 0),
      onBuildAction: CustomTimerAction.auto_start,
      builder: (CustomTimerRemainingTime remaining) {
        return Text(
          "${remaining.minutes}:${remaining.seconds}",
          style: TextStyle(fontSize: 17, fontWeight: FontWeight.w600),
        );
      },
    );
  }

  Widget _createPauseText() {
    final minutesSeconds = DateService.convertIntoSeconds(widget.time);
    return Text(
      "${minutesSeconds.minutes.toString().padLeft(2, '0')}:${minutesSeconds.seconds.toString().padLeft(2, '0')}",
      style: TextStyle(
        fontSize: 17,
        fontWeight: FontWeight.w600,
      ),
    );
  }
}

但它显示了这样的错误： 错误

然后它说：未定义名称“CustomTimerAction”。 并且：未定义命名参数“onBuildAction”。

有人可以帮忙吗？

Answer 1

CustomTimer 没有属性 from 但 开始。正如错误所说，这是必需的。因此，对于您的情况，您必须将 from 更改为 begin。此外，属性 onBuildAction 也不存在。

Widget _createCountdownTimer() {
    return CustomTimer(
      begin: Duration(seconds: widget.time),
      end: Duration(seconds: 0),
      builder: (CustomTimerRemainingTime remaining) {
        return Text(
          "${remaining.minutes}:${remaining.seconds}",
          style: TextStyle(fontSize: 17, fontWeight: FontWeight.w600),
        );
      },
    );
  }