开始制作好友系统了, 发现有一个UI跟QQ的面板一模一样. 于是就写了一个公共的下拉滚动框.需要把按钮的中心点(pivot.y = 1),描点为最上方 直接上图吧

代码如下:

using UnityEngine;using System.Collections;using UnityEngine.UI;using UnityEngine.EventSystems;using System.Collections.Generic;using UnityEngine.Events;public class DropScroll : MonoBehaviour {    [SerializeField]    private Button[] btnList;               //提供多个按钮    private RectTransform thisRT;    [SerializeField]    private GameObject scrollViewTmp;       //提供一个滚动视图模版    private List
     
       scrollViewList = new List
      
       ();     public void Start()     {        Init();    }    public void Init()     {        RectTransform rt = null;        foreach (var btn in btnList)        {            EventTriggerListener.Get(btn.gameObject).OnClick += BtnDropClickEvent;            rt = GameObject.Instantiate(scrollViewTmp).GetComponent
       
        ();            scrollViewList.Add(rt);            rt.gameObject.SetActive(false);            rt.transform.SetParent(this.transform,false);        }        thisRT = this.GetComponent
        
         ();    }    private void BtnDropClickEvent(GameObject go)     {        RectTransform rt = go.GetComponent
         
          ();        RectTransform btnRt = null;        float height = thisRT.sizeDelta.y;        int index = rt.GetSiblingIndex();        HideAllScrollView();        scrollViewList[index].sizeDelta = new Vector2(thisRT.sizeDelta.x, height - btnList.Length * rt.sizeDelta.y);        scrollViewList[index].anchoredPosition = new Vector2(0, -((index + 1) * rt.sizeDelta.y));        scrollViewList[index].gameObject.SetActive(true);        for (int i = 0; i < btnList.Length; i++)        {            btnRt = btnList[i].GetComponent
          
           (); if (i > index) { btnRt.anchoredPosition = new Vector2(btnRt.anchoredPosition.x, -height + ((btnList.Length - i) * btnRt.sizeDelta.y)); } else { btnRt.anchoredPosition = new Vector2(btnRt.anchoredPosition.x, -(i * btnRt.sizeDelta.y)); } } } private void HideAllScrollView() { for (int i = 0; i < scrollViewList.Count; i++) { scrollViewList[i].gameObject.SetActive(false); } }}public class EventTriggerListener : UnityEngine.EventSystems.EventTrigger { public delegate void VoidDelegate(GameObject go); public event VoidDelegate OnClick; static public EventTriggerListener Get(GameObject go) { EventTriggerListener listener = go.GetComponent
           
            (); if (listener == null) listener = go.AddComponent
            
             (); return listener; } public override void OnPointerClick(PointerEventData eventData) { if (OnClick != null) OnClick(gameObject); }}
            
           
          
         
        
       
      
     

 

层次图: