Unity/UIImage

幅修正

GameObject graph = GameObject.Find("/Canvas/Graph");
RectTransform textRect = graph.GetComponent<RectTransform>();
textRect.sizeDelta = new Vector2(1000.0f, 1000.0f);

幅と高さ

float width = gameObject.GetComponent<RectTransform>().sizeDelta.x; // 幅
float height = gameObject.GetComponent<RectTransform>().sizeDelta.y; // 高さ

UiImage複製して配置

• Canvas/CopySourceImageにコピー元Image設置
• NewImageが新しくできるImage

GameObject canvas = GameObject.Find("Canvas");
GameObject copySourceImage = GameObject.Find("Canvas/CopySourceImage");
GameObject newImage = new GameObject("NewImage");
newImage.transform.SetParent(canvas.transform, false);
newImage.transform.SetSiblingIndex(copySourceImage.transform.GetSiblingIndex());
RectTransform baseTransform = copySourceImage.transform as RectTransform;
RectTransform rectTransform = newImage.AddComponent<RectTransform>();
rectTransform.anchorMax = baseTransform.anchorMax;
rectTransform.anchorMin = baseTransform.anchorMin;
rectTransform.anchoredPosition = baseTransform.anchoredPosition;
rectTransform.sizeDelta = baseTransform.sizeDelta;
rectTransform.localScale = baseTransform.localScale;
rectTransform.localPosition = baseTransform.localPosition;
rectTransform.localRotation = baseTransform.localRotation;
Image img = newImage.AddComponent<Image>();
img.sprite = copySourceImage.GetComponent<Image>().sprite;

参考：https://teratail.com/questions/42899