Flutter 闪屏页面 3s的一个透明渐变动画

Posted 2021-06-29 安果移不动

import 'package:flutter/material.dart';
import 'package:my_translate/pages/index_page.dart';

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

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

class _OpenAnimationState extends State<OpenAnimation>
    with TickerProviderStateMixin {
  late AnimationController _controller;
  late Animation _animation;

  @override
  void initState() {
    super.initState();
    _controller =
        AnimationController(vsync: this, duration: Duration(seconds: 3));
    _animation = Tween(begin: 0.0, end: 1.0).animate(_controller);
    _animation.addStatusListener((status) {
      //动画结束
      if (status == AnimationStatus.completed) {
        Navigator.of(context).pushAndRemoveUntil(
            MaterialPageRoute(builder: (context) {
          return IndexPage();
        }), (route) => route == null);
      }
    });
    _controller.forward();
  }

  @override
  Widget build(BuildContext context) {
    return FadeTransition(
      opacity: _controller,
      child: Image.asset(
        "images/open_animtion.jpg",
        fit: BoxFit.cover,
      ),
    );
  }
}

main.dart

import 'package:flutter/material.dart';
import 'package:my_translate/animation/open_animation.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return Container(
      child: MaterialApp(
        title: 'Goole Translate',
        theme: ThemeData(
            // This is the theme of your application.
            //
            // Try running your application with "flutter run". You'll see the
            // application has a blue toolbar. Then, without quitting the app, try
            // changing the primarySwatch below to Colors.green and then invoke
            // "hot reload" (press "r" in the console where you ran "flutter run",
            // or simply save your changes to "hot reload" in a Flutter IDE).
            // Notice that the counter didn't reset back to zero; the application
            // is not restarted.
            primarySwatch: Colors.blue,
            primaryColor: Colors.blue[600]),
        home: OpenAnimation(),
      ),
    );
  }
}

跳转的页面

import 'package:flutter/material.dart';

class IndexPage extends StatelessWidget {
  const IndexPage({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Googlt Translate"),
      ),
      body: Center(
        child: Text("这是显示的文字"),
      ),
    );
  }
}