IoC

The most simple IoC Container of Dart and Flutter

If you looking for a package that is light-weight and provide production-ready of inversion of control, then this package is right for you.

This package provides only 2 main api, easy to learn and use, but definitely fits most use case in your flutter project.

If you are a server developer developing small or medium scale project, it's very likely you want to use this package. However, large scale project may need more powerful heavy-weight IoC library.

You can use it in your angular project, but we highly recommend you use dependency injection system provided by angular.

Goal

Keep it minimal, light-weight

Important

  1. The container does not rely on reflection, it's just a Map, so supports Flutter
  2. Dart2 is required to use this package

Feature

  1. Supports singleton
  2. Supports binding to anything
  3. Supports lazy initialization (Developing)
  4. Detects circular dependencies (Developing)

Usage

bind to a string:

import 'package:ioc/ioc.dart';

main() {
  Ioc().bind('MyClass', (ioc) => new MyClass());
  
  // later
  Ioc().use('MyClass'); // you will get an instance of MyClass
  // with generic if you want
  Ioc().use<MyClass>('MyClass');
}

bind to self:

import 'package:ioc/ioc.dart';

main() {
  Ioc().bind(MyClass, (ioc) => new MyClass());
  
  // later
  Ioc().use(MyClass); // you will get an instance of MyClass
}

bind to other:

import 'package:ioc/ioc.dart';

main() {
  Ioc().bind(MyClass, (ioc) => new OtherClass());
  
  // later
  Ioc().use(MyClass); // you will get an instance of OtherClass
}

bind with other dependency

import 'package:ioc/ioc.dart';

main() {
  Ioc().bind('MyClass', (Ioc ioc) {
    OtherClass other = ioc.use<OtherClass>('OtherClass');
    
    return new MyClass(other);
  });
  
  // later
  Ioc().use<MyClass>('MyClass'); // you will get an instance of OtherClass
}

using singleton:

import 'package:ioc/ioc.dart';

class A {
  void someMethod() {}
}

main() {
  // use singleton on one
  Ioc().bind('A', (ioc) => new A(), singleton: true);

  Ioc().use<A>('A').someMethod();

  // use singleton on all
  Ioc().config['singlton'] = true;

  Ioc().use<A>('A').someMethod();
}

using lazy-loading singleton:

import 'package:ioc/ioc.dart';

class A {
  void someMethod() {}
}

main() {
  // use lazy loaded singleton on one
  Ioc().bind('A', (ioc) => new A(), singleton: true, lazy: true);

  // class A will only be instantiated after first .use('A')
  Ioc().use<A>('A').someMethod();

  // use lazy loaded singleton on all
  Ioc().config['lazy'] = true;

  Ioc().use<A>('A').someMethod();
}

Libraries

ioc