H5_Flutter/lib/view/component/loading.dart

import 'package:flutter/material.dart';

import '../../utils/size_fit.dart';

class Loading extends StatefulWidget {
  const Loading({Key? key}) : super(key: key);

  @override
  State<Loading> createState() => _LoadingState();
}

class _LoadingState extends State<Loading> with SingleTickerProviderStateMixin {
  AnimationController? controller;

  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    controller = AnimationController(
        vsync: this, duration: const Duration(milliseconds: 400));
    controller!.addStatusListener((status) {
      if (status == AnimationStatus.completed) {
        controller!.reset();
        controller!.forward();
      } else if (status == AnimationStatus.dismissed) {}
    });
    controller!.forward();
  }

  @override
  void dispose() {
    controller!.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    SizeFit.initialize(context);
    return RotationTransition(
      turns: controller!,
      alignment: Alignment.center,
      child: Image.asset(
        'assets/images/toast_loading.png',
        width: 48.px,
        height: 48.px,
      ),
    );
  }
}