class_builder 1.0.1

  • Example
  • Installing
  • Versions
  • 70

class_builder #

util for string based class initialization

Getting Started #

register class #

ClassBuilder.register<ClassBuilderTest>(() => ClassBuilderTest());

instantiate from string #

var instance = ClassBuilder.fromString('ClassBuilderTest');

check type #

TypeMatcher<ClassBuilderTest>().check(instance) // true

[0.0.1] - TODO: Add release date.

  • TODO: Describe initial release.


import 'package:class_builder/class_builder.dart';
import 'package:flutter/material.dart';

class HomePage extends StatelessWidget {
  Widget build(BuildContext context) {
    return Container();

class SettingPage extends StatelessWidget {
  Widget build(BuildContext context) {
    return Container(
      child: Text('Settings page'),

class Main extends StatefulWidget {
  _MainState createState() => _MainState();

class _MainState extends State<Main> {
  var _className;

  void initState() {
    _className = 'HomePage'; // or get it from backend

    ClassBuilder.register<HomePage>(() => HomePage());
    ClassBuilder.register<SettingPage>(() => SettingPage());

  Widget build(BuildContext context) {
    return Container(
      child: ClassBuilder.fromString(_className),

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  class_builder: ^1.0.1

2. Install it

You can install packages from the command line:

with Flutter:

$ flutter pub get

Alternatively, your editor might support flutter pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:class_builder/class_builder.dart';
Version Uploaded Documentation Archive
1.0.1 Mar 4, 2019 Go to the documentation of class_builder 1.0.1 Download class_builder 1.0.1 archive
1.0.0 Mar 4, 2019 Go to the documentation of class_builder 1.0.0 Download class_builder 1.0.0 archive
0.0.1 Mar 4, 2019 Go to the documentation of class_builder 0.0.1 Download class_builder 0.0.1 archive
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Learn more about scoring.

We analyzed this package on Jun 26, 2019, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.3.2
  • pana: 0.12.18
  • Flutter: 1.5.4-hotfix.2


Detected platforms: Flutter

References Flutter, and has no conflicting libraries.

Health issues and suggestions

Document public APIs. (-1 points)

6 out of 6 API elements have no dartdoc comment.Providing good documentation for libraries, classes, functions, and other API elements improves code readability and helps developers find and use your API.

Maintenance issues and suggestions

Support latest dependencies. (-5 points)

The version constraint in pubspec.yaml does not support the latest published versions for 1 dependency.


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.1.0 <3.0.0
flutter 0.0.0
Transitive dependencies
collection 1.14.11
meta 1.1.6 1.1.7
sky_engine 0.0.99
typed_data 1.1.6
vector_math 2.0.8
Dev dependencies