数字が徐々に変わって目的の数値に行くスクリプト

ゲームのUIで、こんな感じの演出ってよくあると思います。スクリプトを書きました。

以下のスクリプトをTextコンポーネントを持ったオブジェクトに貼り付けて、SlideToNumber( from_number, to_number, duration )を呼べば、from_numberからto_numberへduration秒かけて遷移します。

using System;
using System.Collections;
using UnityEngine;
using UnityEngine.UI;

[RequireComponent(typeof(Text))]
public class SlideNumberEffectController : MonoBehaviour {
    public Action OnComplete = null;//終わった時のコールバック

    private Text  text;
    private float speed;
    private float number;
    private float targetNumber;

    private Coroutine playCoroutine = null;

#if UNITY_EDITOR
    [SerializeField]
    private int debugToNumber = 10;
    [SerializeField]
    private float debugDuration = 1.0f;
#endif

    void Awake()
    {
        text = GetComponent<Text>();
    }

    //
    // 数値をすぐにセット
    //
    public void SetNumber( int n )
    {
        number = (float)n;
        text.text = ( (int)number ).ToString();
        if( playCoroutine != null )
        {
            StopCoroutine( playCoroutine );
            playCoroutine = null;
        }
    }

    //
    // from_number から to_number に徐々に移行
    //
    public void SlideToNumber( int from_number, int to_number, float duration )
    {
        SetNumber( from_number );
        SlideToNumber( to_number, duration );
    }

    //
    // 今の値から から to_number に徐々に移行
    //
    public void SlideToNumber( int to_number, float duration )
    {
        targetNumber = to_number;
        speed = ( ( targetNumber - number ) / duration );

        if( playCoroutine != null )
        {
            StopCoroutine( playCoroutine );
        }
        playCoroutine = StartCoroutine( "slideTo" );
    }

    private IEnumerator slideTo()
    {
        while( true )
        {
            var delta = speed * Time.deltaTime;
            var next_number = number + delta;
            text.text = ( (int)next_number ).ToString();

            number = next_number;

            if( UnityEngine.Mathf.Sign( speed ) * ( targetNumber - number ) <= 0.0f )
            {
                break;
            }
            yield return null;
        }
        playCoroutine = null;;
        number = targetNumber;
        text.text = ( (int)number ).ToString();
        if( OnComplete != null )
        {
            OnComplete();
            OnComplete = null;
        }
    }

#if UNITY_EDITOR
    [ContextMenu( "Test" )]
    void Test()
    {
        SlideToNumber( debugToNumber, debugDuration );
    }
#endif

}

おわり。