Flutter Onboarding - 如何同时滑动两张图片？

Question

我想用浮动操作按钮在屏幕底部的末端用一个结束图像向右滑动背景图像，并想像其他入门屏幕一样向右滑动一个带有背景图像的图像列表。这里我需要 3 个屏幕，最后一个屏幕将是登录页面。我为此使用了 Transformer Page View 包。目前，我在浮动操作按钮中使用了一个图像，但它不起作用。我怎么能做到这一点？

 import 'package:flutter/material.dart';
 import 'package:onlycentertainment/pages/splashscreen.dart';
 import 'package:transformer_page_view/transformer_page_view.dart';



class TestPage1 extends StatefulWidget {
  final String title;
  TestPage1({this.title});
  @override
  TestPage1State createState() {
    return new TestPage1State();
  }
}

class TestPage1State extends State<TestPage1> {
  int _slideIndex = 0;
  int _bottomIndex = 0;

  final List<String> images = [
    "assets/images/welcome01.jpg",
    "assets/images/welcome02.jpg",
    "assets/images/welcome01.jpg",
  ];

  final List<String> text0 = [
    "Welcome in your app",
    "Enjoy teaching...",
    "Showcase your skills",
    "Friendship is great"
  ];

  final List<String> text1 = [
    "App for food lovers, satisfy your taste",
    "Find best meals in your area, simply",
    "Have fun while eating your relatives and more",
    "Meet new friends from all over the world"
  ];

  final IndexController controller = IndexController();

  @override
  Widget build(BuildContext context) {

    TransformerPageView transformerPageView = TransformerPageView(
        pageSnapping: true,
        onPageChanged: (index) {
          setState(() {
            this._slideIndex = index;
            this._bottomIndex = index;
          });
        },
        loop: false,
        controller: controller,
        transformer: new PageTransformerBuilder(
            builder: (Widget child, TransformInfo info) {
              return SingleChildScrollView(
                physics: NeverScrollableScrollPhysics(),
                child: new Material(
                  child: new Container(
                    alignment: Alignment.center,
                    color: Colors.white,
                    child: Column(
                      children: <Widget>[
                        new ParallaxContainer(
                          child: new Image.asset(
                            images[info.index],
                            fit: BoxFit.cover,

                          ),
                          position: info.position,
                          translationFactor: 400.0,
                        ),
                        SizedBox(
                          height: 45.0,
                        ),
                        new ParallaxContainer(
                          child: new Text(
                            text1[info.index],
                            textAlign: TextAlign.center,
                            style: new TextStyle(
                                color: Colors.white,
                                fontSize: 28.0,
                                fontFamily: 'Quicksand',
                                fontWeight: FontWeight.bold),
                          ),
                          position: info.position,
                          translationFactor: 300.0,
                        ),
                      ],
                    ),
                  ),
                ),
              );
            }),
        itemCount: 3);

    return Scaffold(
      backgroundColor: Color(0xff243951),
      body: transformerPageView,
      floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
      floatingActionButton: Container(
        height: 70,
        width: MediaQuery.of(context).size.width,
        child: IconButton(icon: Image.asset('assets/images/asset1.png'), onPressed: (){
          Navigator.of(context).push(MaterialPageRoute(builder: (context)=>SplashScreen()));
        }),
      ),
    );

  }
}

Answer 1

我不确定我是否理解正确，但是你的代码的问题是“SplashScreen()”部分，它不能为空，我做了一个工作示例，如果我误解了你的意思，请查看并告诉我想做。

import 'package:flutter/material.dart';
import 'package:splashscreen/splashscreen.dart';
import 'package:transformer_page_view/transformer_page_view.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter Demo',
      theme: new ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: new TestPage1(title: 'Flutter Demo Home Page'),
    );
  }
}

class TestPage1 extends StatefulWidget {
  final String title;
  TestPage1({this.title});
  @override
  TestPage1State createState() {
    return new TestPage1State();
  }
}

class TestPage1State extends State<TestPage1> {
  int _slideIndex = 0;
  int _bottomIndex = 0;

  final List<String> images = [
    "assets/images/welcome01.jpg",
    "assets/images/welcome02.jpg",
    "assets/images/welcome01.jpg",
  ];

  final List<String> text0 = [
    "Welcome in your app",
    "Enjoy teaching...",
    "Showcase your skills",
    "Friendship is great"
  ];

  final List<String> text1 = [
    "App for food lovers, satisfy your taste",
    "Find best meals in your area, simply",
    "Have fun while eating your relatives and more",
    "Meet new friends from all over the world"
  ];

  final IndexController controller = IndexController();

  @override
  Widget build(BuildContext context) {

    TransformerPageView transformerPageView = TransformerPageView(
        pageSnapping: true,
        onPageChanged: (index) {
          setState(() {
            this._slideIndex = index;
            this._bottomIndex = index;
          });
        },
        loop: false,
        controller: controller,
        transformer: new PageTransformerBuilder(
            builder: (Widget child, TransformInfo info) {
              return SingleChildScrollView(
                physics: NeverScrollableScrollPhysics(),
                child: new Material(
                  child: new Container(
                    alignment: Alignment.center,
                    color: Colors.white,
                    child: Column(
                      children: <Widget>[
                        new ParallaxContainer(
                          child: new Image.asset(
                            images[info.index],
                            fit: BoxFit.cover,

                          ),
                          position: info.position,
                          translationFactor: 400.0,
                        ),
                        SizedBox(
                          height: 45.0,
                        ),
                        new ParallaxContainer(
                          child: new Text(
                            text1[info.index],
                            textAlign: TextAlign.center,
                            style: new TextStyle(
                                color: Colors.white,
                                fontSize: 28.0,
                                fontFamily: 'Quicksand',
                                fontWeight: FontWeight.bold),
                          ),
                          position: info.position,
                          translationFactor: 300.0,
                        ),
                      ],
                    ),
                  ),
                ),
              );
            }),
        itemCount: 3);

    return Scaffold(
      backgroundColor: Color(0xff243951),
      body: transformerPageView,
      floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
      floatingActionButton: Container(
        height: 70,
        width: MediaQuery.of(context).size.width,
        child: IconButton(icon: Image.asset(images[_bottomIndex]), onPressed: (){
          Navigator.of(context).push(MaterialPageRoute(builder: (context)=>SplashScreen(
              seconds: 4,
              navigateAfterSeconds: new AfterSplash(),
              title: new Text('Welcome In SplashScreen',
                style: new TextStyle(
                    fontWeight: FontWeight.bold,
                    fontSize: 20.0
                ),
              )
          )
          )
          );
    }
    ),
          ),
        );

  }
}
class AfterSplash extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text("Welcome In SplashScreen Package"),
        automaticallyImplyLeading: false,
      ),
      body: new Center(
        child: new Text("Succeeded!",
          style: new TextStyle(
              fontWeight: FontWeight.bold,
              fontSize: 30.0
          ),
        ),
      ),
    );
  }
}