/// <summary>
/// Start the tweening operation.
/// </summary>
static public TweenHeight Begin(RectTransform rect, float duration, int height)
{
TweenHeight comp = UITweener.Begin <TweenHeight>(rect.gameObject, duration);
comp.from = (int)rect.sizeDelta.y;
comp.to = height;
if (duration <= 0f)
{
comp.Sample(1f, true);
comp.enabled = false;
}
return(comp);
}