unity 中代码方式添加UI元素

png图片先转成sprite2d and UI格式

using UnityEngine.UI;

//先创建1个UI Canvas,tag="UICanvas"

var uiRootTran = GameObject.FindGameObjectWithTag("UICanvas").transform;
var dig0 = new GameObject();
dig0.transform.SetParent(uiRootTran);

dig0.transform.localScale = new Vector3(0.5f, 0.5f, 0.5f);//缩放

var rect = dig0.AddComponent<RectTransform>();
rect.anchorMin = new Vector2(0.5f, 0.5f);//锚点
rect.anchorMax = new Vector2(0.5f, 0.5f);

rect.sizeDelta = new Vector2(32, 64);//尺寸
rect.localPosition = new Vector3(0, 350, 0);//坐标
        
var img = dig0.AddComponent<Image>();

Sprite sp = Resources.Load("4", typeof(Sprite)) as Sprite;
img.sprite = sp;