import 'dart:async'; import 'package:flutter/material.dart'; class ClockTimerProvider extends ChangeNotifier { ///登录页验证码计时器 int second = 60; bool timerStart = false; Timer? timer; void startTimer() { timerStart = true; if (timer != null) { return; } timer = Timer.periodic(Duration(seconds: 1), (timer) { if (second > 0) { second--; notifyListeners(); } else { stopTimer(); } }); } void stopTimer() { second = 60; timerStart = false; timer?.cancel(); timer = null; notifyListeners(); } }