BracerLib/Assets/Scripts/DI/DependencyFactory.cs

using System;
using System.Runtime.Serialization;
using UnityEngine;
using Object = UnityEngine.Object;

namespace BracerLib.DI
{
    public delegate object FactoryFunc(DependencyProvider provider);

    public static class DependencyFactory
    {
        public static FactoryFunc FromClass<T>() where T : class, new()
        {
            return provider =>
            {
                var type = typeof(T);
                var obj = FormatterServices.GetUninitializedObject(type);

                provider.Inject(obj);

                type.GetConstructor(Type.EmptyTypes)?.Invoke(obj, null);

                return (T)obj;
            };
        }

        public static FactoryFunc FromGameObject<T>(T instance) where T : MonoBehaviour
        {
            return dependencies =>
            {
                var children = instance.GetComponentsInChildren<MonoBehaviour>(true);
                foreach (var child in children)
                    dependencies.Inject(child);

                return instance;
            };
        }

        public static FactoryFunc FromPrefab<T>(T prefab) where T : MonoBehaviour
        {
            return provider =>
            {
                var prefabObj = prefab.gameObject;
                var wasActive = prefabObj.activeSelf;
                prefabObj.SetActive(false);
                var instance = Object.Instantiate(prefab);
                prefabObj.SetActive(wasActive);
                var children = instance.GetComponentsInChildren<MonoBehaviour>(true);

                foreach (var child in children)
                    provider.Inject(child);

                instance.gameObject.SetActive(wasActive);

                return instance.GetComponent<T>();
            };
        }
    }
}