Flutter资源加载插件load的使用

load 是一个全局加载组件，可以通过简单的配置来使用。它是一个纯Flutter库，不使用原生代码。使用方式类似于 OKToast。

目录

• ScreenShot
• Usage
• Advanced Usage
  • Custom Loading Widget
  • Custom some config

ScreenShot

Usage

安装

在 pubspec.yaml 文件中添加依赖：

dependencies:
  load: $latest_version

导入

在 Dart 文件中导入 load 包：

import 'package:load/load.dart';

包裹你的应用

将 LoadingProvider 包裹在你的应用根部：

void main() {
  runApp(
    LoadingProvider(
      child: MyApp(),
    ),
  );
}

// 或者

LoadingProvider(
  child: MaterialApp(),
);

你也可以在 MaterialApp 的 builder 中包含 LoadingProvider：

MaterialApp(
  builder: (context, widget) {
    return LoadingProvider(
      child: widget,
    );
  },
);

显示或隐藏对话框

使用以下方法显示或隐藏加载对话框：

showLoadingDialog();
showCustomLoadingWidget(Container()); // 自定义对话框
hideLoadingDialog();

Advanced Usage

Custom Loading Widget

使用 LoadingThemeData 和 loadingWidgetBuilder 来自定义加载组件：

LoadingProvider(
  themeData: LoadingThemeData(),
  loadingWidgetBuilder: (ctx, data) {
    return Center(
      child: SizedBox(
        width: 30,
        height: 30,
        child: Container(
          child: CupertinoActivityIndicator(),
          color: Colors.blue,
        ),
      ),
    );
  },
  child: MyApp(),
);

Custom some config

所有参数都是可选的：

示例代码

import 'package:flutter/material.dart';
import 'package:flutter/cupertino.dart';
import 'package:load/load.dart';

void main() {
  runApp(
    LoadingProvider(
      themeData: LoadingThemeData(
          // tapDismiss: false,
          ),
      child: MyApp(),
    ),
  );
}

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

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  @override
  void initState() {
    super.initState();
    showAndDelayDismiss();
  }

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
    showAndDelayDismiss();
  }

  void showAndDelayDismiss([Duration duration = const Duration(seconds: 2)]) async {
    var future = await showLoadingDialog();
    Future.delayed(duration, () {
      future.dismiss();
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
        actions: [
          buildDefaultDialog(),
          buildCustomLoadingButton(),
          buildTouchLoadingDialog(),
        ],
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ),
    );
  }

  Widget buildCustomLoadingButton() {
    return IconButton(
      icon: Icon(Icons.cloud_download),
      onPressed: () {
        showCustomLoadingWidget(
          Center(
            child: Container(
              padding: const EdgeInsets.all(30),
              child: Column(
                mainAxisSize: MainAxisSize.min,
                children: [
                  LinearProgressIndicator(),
                  Container(height: 10),
                  Text("loading"),
                  TextButton(
                    onPressed: () {
                      hideLoadingDialog();
                    },
                    child: Text('dismiss'),
                  ),
                ],
              ),
            ),
          ),
          tapDismiss: false,
        );
      },
    );
  }

  Widget buildTouchLoadingDialog() {
    return IconButton(
      icon: Icon(Icons.touch_app),
      onPressed: () {
        showCustomLoadingWidget(
          Center(
            child: Container(
              padding: const EdgeInsets.all(30),
              child: Column(
                mainAxisSize: MainAxisSize.min,
                children: [
                  Container(
                    width: 40,
                    height: 40,
                    color: Colors.blue,
                    child: CupertinoActivityIndicator(radius: 10),
                  ),
                  Container(height: 10),
                  TextButton(
                    child: Text("Add"),
                    onPressed: () {
                      _counter++;
                      setState(() {});
                      print("touch Add button, this counter is :$_counter");
                    },
                  ),
                ],
              ),
            ),
          ),
        );
      },
    );
  }

  Widget buildDefaultDialog() {
    return IconButton(
      icon: Icon(Icons.slideshow),
      onPressed: () {
        showLoadingDialog();
      },
    );
  }

  Widget exampleLoadApp() {
    return LoadingProvider(
      themeData: LoadingThemeData(),
      loadingWidgetBuilder: (ctx, data) {
        return Center(
          child: SizedBox(
            width: 30,
            height: 30,
            child: Container(
              child: CupertinoActivityIndicator(),
              color: Colors.blue,
            ),
          ),
        );
      },
      child: MyApp(),
    );
  }
}

希望这些内容对你有帮助！如果你有任何问题或需要进一步的帮助，请随时提问。