Flutter:为小工具的z轴设置动画

import 'package:flutter/material.dart';

class MyWidget extends StatefulWidget {
  @override
  _MyWidgetState createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> with SingleTickerProviderStateMixin {
  AnimationController _controller;
  Animation<double> _animation;

  @override
  void initState() {
    super.initState();
    
    _controller = AnimationController(
      duration: Duration(seconds: 1),
      vsync: this,
    );
    
    _animation = Tween<double>(begin: 0, end: 1).animate(_controller);
    
    _controller.forward();
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return AnimatedBuilder(
      animation: _animation,
      builder: (context, child) {
        return Transform.translate(
          offset: Offset(0, _animation.value * 100), // 根据动画值改变z轴偏移量
          child: child,
        );
      },
      child: Container(
        width: 100,
        height: 100,
        color: Colors.blue,
      ),
    );
  }
}