1. 代码

using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;public class UIDragZoom : MonoBehaviour, IDragHandler, IScrollHandler
{private Vector2 originalSize;private Vector2 originalPosition;private RectTransform rectTransform;private float minSize = 30f;private float maxSize = 200f;private void Start(){rectTransform = GetComponent<RectTransform>();originalSize = rectTransform.sizeDelta;originalPosition = rectTransform.anchoredPosition;}public void OnDrag(PointerEventData eventData){rectTransform.anchoredPosition += eventData.delta;}public void OnScroll(PointerEventData eventData){float scroll = eventData.scrollDelta.y;Vector2 newSize = rectTransform.sizeDelta + Vector2.one * scroll;float temp = Mathf.Clamp(newSize.x, minSize, maxSize);newSize = new Vector2(temp, temp);rectTransform.sizeDelta = newSize;}public void ResetUI(){rectTransform.sizeDelta = originalSize;rectTransform.anchoredPosition = originalPosition;}
}

2. 测试场景