코드로 ugui button 만들기

if (FindObjectOfType<EventSystem>() == null)
{
    var es = new GameObject("EventSystem", typeof(EventSystem));
    es.AddComponent<StandaloneInputModule>();
}

var canvasObject = new GameObject("Canvas");
var canvas = canvasObject.AddComponent<Canvas>();
canvasObject.AddComponent<GraphicRaycaster>();
canvas.renderMode = RenderMode.ScreenSpaceOverlay;

var buttonObject = new GameObject("Button");
var image = buttonObject.AddComponent<Image>();
image.transform.SetParent(canvas.transform);
image.rectTransform.sizeDelta = new Vector2(180, 50);
image.rectTransform.anchoredPosition = Vector3.zero;
image.color = new Color(1f, .3f, .3f, .5f);

var button = buttonObject.AddComponent<Button>();
button.targetGraphic = image;
button.onClick.AddListener(() => Debug.Log(Time.time));

var textObject = new GameObject("Text");
textObject.transform.parent = buttonObject.transform;
var text = textObject.AddComponent<Text>();
text.rectTransform.sizeDelta = Vector2.zero;
text.rectTransform.anchorMin = Vector2.zero;
text.rectTransform.anchorMax = Vector2.one;
text.rectTransform.anchoredPosition = new Vector2(.5f, .5f);
text.text = "Button Test!";
text.font = Resources.FindObjectsOfTypeAll<Font>()[0];
text.fontSize = 20;
text.color = Color.yellow;
text.alignment = TextAnchor.MiddleCenter;