URI的目標不存在：'package:flutter_intro_slider_example/home.dart'，名稱'Slide'不是一個類

URI 的目標不存在：'package:flutter_intro_slider_example/home.dart'。“幻燈片”這個名字不是一個類。沒有為型別“_IntroSliderPageState”定義方法“HomePage”。未定義的類“幻燈片”。啟用空安全時，默認的“串列”建構式不可用。

有人知道這個飛鏢代碼有什么問題嗎？我直接從

import 'package:flutter/material.dart';
import 'package:flutter_intro_slider_example/home.dart';
import 'package:intro_slider/dot_animation_enum.dart';
import 'package:intro_slider/intro_slider.dart';
import 'package:intro_slider/slide_object.dart';

class IntroSliderPage extends StatefulWidget {
  @override
  _IntroSliderPageState createState() => _IntroSliderPageState();
}

class _IntroSliderPageState extends State<IntroSliderPage> {
  List<Slide> slides = new List();

  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    slides.add(
      new Slide(
        title: "Hello Food!",
        description:
        "The easiest way to order food from your favorite restaurant!",
        pathImage: "assets/images/hamburger.png",
      ),
    );
    slides.add(
      new Slide(
        title: "Movie Tickets",
        description: "Book movie tickets for your family and friends!",
        pathImage: "assets/images/movie.png",
      ),
    );
    slides.add(
      new Slide(
        title: "Great Discounts",
        description: "Best discounts on every single service we offer!",
        pathImage: "assets/images/discount.png",
      ),
    );
    slides.add(
      new Slide(
        title: "World Travel",
        description: "Book tickets of any transportation and travel the world!",
        pathImage: "assets/images/travel.png",
      ),
    );
  }

  List<Widget> renderListCustomTabs() {
    List<Widget> tabs = new List();
    for (int i = 0; i < slides.length; i  ) {
      Slide currentSlide = slides[i];
      tabs.add(
        Container(
          width: double.infinity,
          height: double.infinity,
          child: Container(
            margin: EdgeInsets.only(bottom: 160, top: 60),
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              crossAxisAlignment: CrossAxisAlignment.center,
              children: [
                Container(
                  padding: EdgeInsets.all(20),
                  decoration: BoxDecoration(
                    shape: BoxShape.circle,
                    color: Colors.white,
                  ),
                  child: Image.asset(
                    currentSlide.pathImage,
                    matchTextDirection: true,
                    height: 60,
                  ),
                ),
                Container(
                  margin: EdgeInsets.only(top: 20),
                  child: Text(
                    currentSlide.title,
                    style: TextStyle(color: Colors.white, fontSize: 25),
                  ),
                ),
                Container(
                  padding: EdgeInsets.symmetric(
                    horizontal: 30,
                  ),
                  child: Text(
                    currentSlide.description,
                    style: TextStyle(
                      color: Colors.white,
                      fontSize: 14,
                      height: 1.5,
                    ),
                    maxLines: 3,
                    textAlign: TextAlign.center,
                    overflow: TextOverflow.ellipsis,
                  ),
                  margin: EdgeInsets.only(
                    top: 15,
                    left: 20,
                    right: 20,
                  ),
                ),
              ],
            ),
          ),
        ),
      );
    }
    return tabs;
  }

  @override
  Widget build(BuildContext context) {
    return IntroSlider(
      backgroundColorAllSlides: Colors.green[700],
      renderSkipBtn: Text("Skip"),
      renderNextBtn: Text(
        "Next",
        style: TextStyle(color: Colors.green[700]),
      ),
      renderDoneBtn: Text(
        "Done",
        style: TextStyle(color: Colors.green[700]),
      ),
      colorDoneBtn: Colors.white,
      colorActiveDot: Colors.white,
      sizeDot: 8.0,
      typeDotAnimation: dotSliderAnimation.SIZE_TRANSITION,
      listCustomTabs: this.renderListCustomTabs(),
      scrollPhysics: BouncingScrollPhysics(),
      shouldHideStatusBar: false,
      onDonePress: () => Navigator.pushReplacement(
        context,
        MaterialPageRoute(
          builder: (_) => HomePage(),
        ),
      ),
    );
  }
}

uj5u.com熱心網友回復：

您需要運行flutter pub get以獲取所有依賴項。如果您正在使用，VS Code則轉到pubspec.yaml并單擊Get Packages 或者如果使用Android Studio則Tools> Flutter>Flutter Pub Get來解決此問題。

在這里找到更多

uj5u.com熱心網友回復：

此代碼將與intro_slider: ^2.3.4包完美運行。您可能已經升級了軟體包版本。使用 intro_slider: ^2.3.4 版本并運行flutter pub get.

uj5u.com熱心網友回復：

運行flutter clean以清除所有構建。然后運行flutter pub upgrade 以升級任何過時的依賴項。最后運行flutter pub get。

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