uGUI ImageとかのマテリアルパラメータをAnimatorで制御したいときにSerializeFieldに露出するのに便利なクラス。本体 (MaterialExposition.cs) と使用サンプル (MaterialExpositionSample.cs)

MaterialExposition.cs

using System;
using UnityEngine;

namespace Ruccho.Utilities
{
    public abstract class MaterialExposition<T> where T : IEquatable<T>
    {
        protected Material target = default;
        private T tempValue = default;
        private int propertyKey = default;

        public void Initialize(Material material, string property, ref T value)
        {
            target = material;
            propertyKey = Shader.PropertyToID(property);
            
            T destValue = GetValue(propertyKey);
            tempValue = destValue;
            value = tempValue;
        }

        public void Update(ref T value)
        {
            T destValue = GetValue(propertyKey);
            
            if (!destValue.Equals(tempValue))
            {
                tempValue = destValue;
                value = tempValue;
            }
            else if(!tempValue.Equals(value))
            {
                tempValue = value;
                SetValue(propertyKey, tempValue);
            }
            
        }

        protected abstract T GetValue(int key);
        protected abstract void SetValue(int key, T value);
    }

    public class MaterialExpositionFloat : MaterialExposition<float>
    {
        protected override float GetValue(int key)
        {
            return target.GetFloat(key);
        }

        protected override void SetValue(int key, float value)
        {
            target.SetFloat(key, value);
        }
    }
    
    public class MaterialExpositionVector4 : MaterialExposition<Vector4>
    {
        protected override Vector4 GetValue(int key)
        {
            return target.GetVector(key);
        }

        protected override void SetValue(int key, Vector4 value)
        {
            target.SetVector(key, value);
        }
    }
    
    public class MaterialExpositionColor : MaterialExposition<Color>
    {
        protected override Color GetValue(int key)
        {
            return target.GetColor(key);
        }

        protected override void SetValue(int key, Color value)
        {
            target.SetColor(key, value);
        }
    }
    
    public class MaterialExpositionInt : MaterialExposition<int>
    {
        protected override int GetValue(int key)
        {
            return target.GetInt(key);
        }

        protected override void SetValue(int key, int value)
        {
            target.SetInt(key, value);
        }
    }
    
}

MaterialExpositionSample.cs

using Ruccho.Utilities;
using UnityEngine;
using UnityEngine.UI;

[ExecuteInEditMode]
public class MaterialExpositionSample : MonoBehaviour
{
    [SerializeField] private Image target = default;

    private MaterialExpositionColor colorProperty = new MaterialExpositionColor();
    [SerializeField] private Color colorValue = default;

    private Material material = default;

    private void Reset()
    {
        GetMaterial();
    }

    private void GetMaterial()
    {
        if (!target)
        {
            target = GetComponent<Image>();
            material = null;
        }
        else if (material != target.material)
        {
            material = null;
        }

        if (target && !material)
        {
            material = target.material;
            colorProperty.Initialize(material, "_Color", ref colorValue);
        }
    }

    private void Start()
    {
    }

    private void Update()
    {
        GetMaterial();
        colorProperty.Update(ref colorValue);
    }
}