RainbowTextColor.cs

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using System.Collections;
using UnityEngine;
using UnityEngine.UI;
 
[DisallowMultipleComponent]
[RequireComponent(typeof(Text))]
public sealed class RainbowTextColor : MonoBehaviour
{
    [Header("Duration")]
    [Tooltip("虹色アニメーションを行う秒数")]
    [Min(0f)]
    public float duration = 3f;
 
    [Header("Speed")]
    [Tooltip("1秒あたり何周Hueを回すか（1=1周/秒）")]
    [Min(0f)]
    public float cyclesPerSecond = 1f;
 
    [Header("Look")]
    [Tooltip("彩度")]
    [Range(0f, 1f)]
    public float saturation = 1f;
 
    [Tooltip("明度")]
    [Range(0f, 1f)]
    public float value = 1f;
 
    [Tooltip("元のアルファに対して掛ける係数（1=そのまま）")]
    [Range(0f, 1f)]
    public float alphaMultiplier = 1f;
 
    [Header("Playback")]
    [Tooltip("開始時に自動再生")]
    public bool playOnEnable = true;
 
    [Tooltip("終了時に元の色へ戻す")]
    public bool restoreOriginalColor = true;
 
    private Text _text;
 
    private Coroutine _routine;
 
    private Color _originalColor;
 
    private void Awake()
    {
        _text = GetComponent<Text>();
        _originalColor = _text.color;
    }
 
    private void OnEnable()
    {
        if (playOnEnable)
        {
            Play();
        }
    }
 
    private void OnDisable()
    {
        Stop();
        if (restoreOriginalColor && _text != null)
        {
            _text.color = _originalColor;
        }
    }
 
    public void Play()
    {
        if (_text == null)
        {
            _text = GetComponent<Text>();
        }
        if (!(_text == null))
        {
            _originalColor = _text.color;
            if (_routine != null)
            {
                StopCoroutine(_routine);
            }
            _routine = StartCoroutine(Run());
        }
    }
 
    public void Stop()
    {
        if (_routine != null)
        {
            StopCoroutine(_routine);
            _routine = null;
        }
        if (restoreOriginalColor && _text != null)
        {
            _text.color = _originalColor;
        }
    }
 
    private IEnumerator Run()
    {
        if (duration <= 0f)
        {
            _routine = null;
            yield break;
        }
        float elapsed = 0f;
        while (elapsed < duration)
        {
            elapsed += Time.unscaledDeltaTime;
            Color color = Color.HSVToRGB(Mathf.Repeat(elapsed * cyclesPerSecond, 1f), saturation, value);
            color.a = _originalColor.a * alphaMultiplier;
            _text.color = color;
            yield return null;
        }
        if (restoreOriginalColor)
        {
            _text.color = _originalColor;
        }
        _routine = null;
    }
}