从UI中拖拽图片，在2维canvas下的拖拽_unity view在两个canvas上移动-优快云博客

本文链接：https://blog.youkuaiyun.com/qq_25254777/article/details/107089828

本文介绍了一个Unity中UI事件处理的示例，包括如何使用IDragHandler和IDropHandler接口来实现UI元素的拖拽和放置功能。通过RectTransformUtility.ScreenPointToLocalPointInRectangle方法将屏幕坐标转换为局部坐标，实现UI元素相对于父元素的位置调整。

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using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;

public class UIEvents : MonoBehaviour,IDragHandler,IDropHandler
 {

	// Use this for initialization
	public RectTransform ParentPos;
	private RectTransform rt;

	bool isFirst = true;
	Vector2 offset = new Vector2();

	void Start()
	{
		rt = transform as RectTransform;
	}
	
	// public void OnPointerClick(PointerEventData eventData)
	// {
	// 	Debug.Log("Click Image!");
	// }

	public void OnDrag(PointerEventData eventData1)
	{
		
		Vector2 mousePos = eventData1.position;
		Vector2 CanvasPos  = new Vector2 ();
		//Debug.Log("鼠标的坐标：" + mousePos.x + " " + mousePos.y);//坐标值以canvas的左下角为坐标原点
		//ScreenPointToLocalPointInRectangle将鼠标在canvas坐标系下 的坐标转换为父坐标系下的坐标
		//这里注意ParentPos 和rt的锚点要一直。
		bool componentIN = RectTransformUtility.ScreenPointToLocalPointInRectangle(ParentPos,mousePos,eventData1.enterEventCamera,out CanvasPos);
		//Debug.Log("Canvas坐标：" + CanvasPos.x + " " + CanvasPos.y);//返回值：以父元素的原点位置作为坐标系的原点
		
		if(isFirst)
		{
			RectTransformUtility.ScreenPointToLocalPointInRectangle(rt,mousePos,eventData1.enterEventCamera,out offset);
			//Debug.Log("偏移量" + offset.x + "  " + offset.y);
			isFirst = false;

		}
		else{
			if(componentIN)
			{
			rt.anchoredPosition = CanvasPos - offset;
			}
		}
	}

//OnDrop 与 OnPointerClick冲突，同时OnPointerClick执行后，OnDrop就不执行了
//OnDrop优先级也高于endDrag
	public void OnDrop(PointerEventData eventData)
	{
		isFirst = true;
		Debug.Log("拖拽结束！");
	}



}