iTween.ValueTo

ValueTo.cs

public class iTweenMethod : MonoBehaviour
{
    // UI Image
    public Image image;

    // 最初の色と最後の色を選択
    public Color startColor;
    public Color endColor;

    void Start()
    {
        ValueTo();
    }

    void ValueTo()
    {
        iTween.ValueTo(gameObject,
                       iTween.Hash(
                             "from", startColor,
                             "to", endColor,
                             "delay", 1f,
                             "time", 2f,
                             "onupdatetarget", gameObject,
                             "onupdate", "OnUpdateColor"
                             )
                         );
    }

    void OnUpdateColor(Color color)
    {
        image.color = color;
    }
}