前言：每日记录自己学习unity的心得和体会，小弟才疏学浅，如有错误的地方，欢迎大佬们指正，感谢~
创建好背包格子
格子的tag值需要设置成Grid 物品tag值需要设置成 Good (自己设置成什么都行) 设置其他参数 需要在脚本中修改
下面上代码 一个继承 MonoBehaviour 一个继承 Button
第一种
using System;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;
using UnityEngine.UI;
/// <summary>
/// 本脚本挂在物品上运行即可
/// </summary>
public class DragImage : MonoBehaviour
{
private Transform beginParentTransform; //记录开始拖动时的父级对象
private Transform canvasParent;
private EventTrigger trigger;
// Use this for initialization
void Start()
{
canvasParent = GameObject.Find("Canvas").transform;
if (!GetComponent<EventTrigger>())
{
trigger = gameObject.AddComponent<EventTrigger>();
}
else
{
trigger = gameObject.GetComponent<EventTrigger>();
}
//开始拖拽的事件
UnityAction<BaseEventData> click = new UnityAction<BaseEventData>(Begin);
EventTrigger.Entry myclick = new EventTrigger.Entry();
myclick.eventID = EventTriggerType.BeginDrag;
myclick.callback.AddListener(click);
trigger.triggers.Add(myclick);
//拖拽中的事件
UnityAction<BaseEventData> _click = new UnityAction<BaseEventData>(OnDrag);
EventTrigger.Entry myclick_ = new EventTrigger.Entry();
myclick_.eventID = EventTriggerType.Drag;
myclick_.callback.AddListener(_click);
trigger.triggers.Add(myclick_);
//结束拖拽的事件
UnityAction<BaseEventData> Endclick = new UnityAction<BaseEventData>(End);
EventTrigger.Entry Endclick_ = new EventTrigger.Entry();
Endclick_.eventID = EventTriggerType.EndDrag;
Endclick_.callback.AddListener(Endclick);
trigger.triggers.Add(Endclick_);
}
/// <summary>
/// 开始拖动时
/// </summary>
public void Begin(BaseEventData data)
{
if (transform.parent == canvasParent) return;
beginParentTransform = transform.parent;
transform.SetParent(canvasParent);
}
/// <summary>
/// 拖动中
/// </summary>
/// <param name="e">UI事件数据</param>
public void OnDrag(BaseEventData e)
{
transform.position = Input.mousePosition;
if (transform.GetComponent<Image>().raycastTarget)
transform.GetComponent<Image>().raycastTarget = false;
}
/// <summary>
/// 结束时
/// </summary>
public void End(BaseEventData data)
{
PointerEventData e = data as PointerEventData;
if (e == null) return;
GameObject target = e.pointerCurrentRaycast.gameObject;
if (target.tag == "Grid") //如果当前拖动物体下是：格子（没有物品）时
{
SetPos_Parent(transform, target.transform);
transform.GetComponent<Image>().raycastTarget = true;
}
else if (target.tag == "Good") //如果是物品
{
SetPos_Parent(transform, target.transform.parent); //将当前拖动物品设置到目标位置
target.transform.SetParent(canvasParent); //目标物品设置到 UI 顶层
SetPos_Parent(target.transform, beginParentTransform); //再将目标物品设置到开始拖动物品的父物体 来完成物品的切换
transform.GetComponent<Image>().raycastTarget = true;
}
else //其他任何情况，物体回归原始位置
{
SetPos_Parent(transform, beginParentTransform);
transform.GetComponent<Image>().raycastTarget = true;
}
}
/// <summary>
/// 设置父物体，UI位置归正
/// </summary>
/// <param name="targetods">对象Transform</param>
/// <param name="parent">要设置到的父级</param>
private void SetPos_Parent(Transform targetods, Transform parent)
{
targetods.SetParent(parent);
targetods.position = parent.position;
}
}
第一种实现来回拖拽的效果,可以相互替换
第二种
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using System;
namespace DragAmer.UI {
//继承button 挂在物品上即可 需要其他功能请自行添加
public class CongDragSwapImage : Button, IDragHandler, IBeginDragHandler, IEndDragHandler
{
private Transform beginParentTransform; //记录开始拖动时的父级对象
private Transform canvasParent;
protected override void Start()
{
base.Start();
canvasParent = GameObject.Find("Canvas").transform;
}
public void OnBeginDrag(PointerEventData _)
{
if (transform.parent == canvasParent) return;
beginParentTransform = transform.parent;
transform.SetParent(canvasParent);
}
public void OnDrag(PointerEventData _)
{
transform.position = Input.mousePosition;
if (transform.GetComponent<Image>().raycastTarget) transform.GetComponent<Image>().raycastTarget = false;
}
public void OnEndDrag(PointerEventData e)
{
GameObject target = e.pointerCurrentRaycast.gameObject;
if (target.tag == "Grid") //如果当前拖动物体下是：格子（没有物品）时
{
SetPos_Parent(transform, target.transform);
transform.GetComponent<Image>().raycastTarget = true;
}
else if (target.tag == "Good") //如果目标是物品
{
SetPos_Parent(transform, target.transform.parent); //将当前拖动物品设置到目标位置
target.transform.SetParent(canvasParent); //目标物品设置到 UI 顶层
SetPos_Parent(target.transform, beginParentTransform); //再将目标物品设置到开始拖动物品的父物体 来完成物品的切换
transform.GetComponent<Image>().raycastTarget = true;
}
else //其他任何情况，物体回归原始位置
{
SetPos_Parent(transform, beginParentTransform);
transform.GetComponent<Image>().raycastTarget = true;
}
}
/// <summary>
/// 设置父物体，UI位置归正
/// </summary>
/// <param name="targetods">对象Transform</param>
/// <param name="parent">要设置到的父级</param>
private void SetPos_Parent(Transform targetods, Transform parent)
{
targetods.SetParent(parent);
targetods.position = parent.position;
}
}
}
