Unity3D UGUI学习小结

今天看了下UGUI的教程，实在太棒了。不过学了个囫囵吞枣。事件处理源码啥的都没心思看下去。具体总结下今天学的：

1.锚点和中心点问题：简单点说就是，锚点四个花瓣在一个点时，中心点的坐标；不在一个点时，中心点和花瓣所组成边框的距离

2.点击事件处理，button可以在OnClick,添加方法。Image等组件可以在EventTrigger设置。也可通过编写类实现以下接口实现。

using UnityEngine.EventSystem

IPointEnterHandler,IPointExitHandler,IPointDownHandler,IPointUpHandler,IPointClickHandler,IDragHandler

IDropHandler,IScrollHandler,IUpdateSelectedHandler,ISelectHandler,IDeselectHandler,IMoveHandler

简单的写了一个鼠标拖动图片的小脚本：

using System;using System.Collections;using System.Collections.Generic;using UnityEngine;using UnityEngine.EventSystems;public class drag:BeHaviour,IDragHandler,IDropHandler{private RectTransform rt; public RectTransform canvas;Vector2 firstpos=new Vector2(); private bool isfirst=true; void Start() { rt=transform as RectTransform; } public void OnDrag(PointsDates eventData){ Vector2 mousepos = eventData.position;  Vector2 uguipos = new Vector2();  bool isrect = RectTransformUtility.ScreenPointToLocalPointInRectangle(canvas,mousepos,eventData.enterEventCamera,out uguipos);  if(isfirst)  {    isfirst=false;    RectTransformUtility.ScreenPointToLocalPointRectangle(rt,mousepos,eventData.enterEventCamera,out firstpos);  }if (isrect)        {            //rt.pivot = uguipos;            rt.anchoredPosition = uguipos-firstpos;        }}void Update () {   }    public void OnDrop(PointerEventData eventData)   {        isfirst = true;     }}

3.点击按钮显示背包等界面

public void onBtClick(){    RectTransform package = Instantiate(packageclone);//生成界面    package.SetParent(this.transform.parent);//改变parent    package.position = new Vector3(0, 0, 0);    package.rotation = Quaternion.Euler(new Vector3(0, 0, 0));    package.localScale = new Vector3(1, 1, 1);    package.anchoredPosition = new Vector2(0, 0);//初始化大小、位置、旋转、在画布的位置等。}

4、最难的拖拽功能，看的迷迷糊糊的，没练习。

抓取物体

using System.Collections;using System.Collections.Generic;using UnityEngine;using UnityEngine.EventSystems;using UnityEngine.UI;   public class dragItem : MonoBehaviour,IDragHandler,IBeginDragHandler,IEndDragHandler {    // Use this for initialization    public dragPanelitem dragItempanel;void Start () {}// Update is called once per framevoid Update () {}    public void OnDrag(PointerEventData eventData)    {        if (dragItempanel != null)        {            dragItempanel.move(eventData);//移动物体        }    }    public void OnBeginDrag(PointerEventData eventData)    {        if (dragItempanel != null)        {            dragItempanel.hideItem();//将Image隐藏        }    }    public void OnEndDrag(PointerEventData eventData)    {        if (dragItempanel != null)        {            dragItempanel.setDragItemID(1);//获取抓取的物体        }    }}

单独定义一个panel，用于存储抓取的物体。并对其操作

using System.Collections;using System.Collections.Generic;using UnityEngine;using UnityEngine.EventSystems;using UnityEngine.UI;
public class dragPanelitem : MonoBehaviour {
    private int DragitemID = 0;    public Image dragimage;// Use this for initialization    void Start () {      } // Update is called once per frame    void Update () {   }    public void move(PointerEventData eventData)    {        dragimage.rectTransform.position = eventData.position;//因为父容器铺满四周，且该image锚点在父容器中心点位置。可以不用转换坐标    }    public void setDragItemID(int itemID)    {        DragitemID = itemID;        dragimage.gameObject.SetActive(true);//获取抓取的物体实际上少了一步，给dragimage赋值的步骤    }    public void hideItem()    {        DragitemID = 0;        dragimage.gameObject.SetActive(false);    }}

好好学习，天天向上。有志同道合的朋友可以关注下。共同进步