简单代码 实现unity Tab菜单效果

image.png

需求：右边为ScrollView 可滑动 左边为TabGroup 滑动对应tab变化

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using System;
namespace Babybus.BabyModule
{
   public class ScrollManager : MonoBehaviour, IBeginDragHandler, IEndDragHandler
   {
       ScrollRect scrollRect;
       public float smoothing = 4;
       private bool isDrag = false;
       private float targetVertivalPosition = 0;
       private float[] pageArray = new float[] { 0.006718779f, 0.35f, 0.68f, 1 }; //设定每一页 设定每一页的float x 信息
       public Toggle[] toggleArray;
       bool dragOnce = false;
       public void OnBeginDrag(PointerEventData eventData)
       {
           isDrag = true;
           dragOnce = true;
       }

       public void OnEndDrag(PointerEventData eventData)
       {
           isDrag = false;
           float posX = scrollRect.verticalNormalizedPosition;
           print(posX);
           int index = 3;
           float offset = Mathf.Abs(pageArray[index] - posX);//默认离第一页最近
           for (int i = 0; i < pageArray.Length; i++)
           {
               float offsettemp = Mathf.Abs(pageArray[i] - posX);
               if (offsettemp < offset)
               {//绝对值值越小离越近
                   index = i;
                   offset = offsettemp;
               }
           }
           targetVertivalPosition = pageArray[index];
           toggleArray[index].isOn = true;
       }

       // Use this for initialization
       void Start()
       {
           scrollRect = this.transform.GetComponent<ScrollRect>();
            scrollRect.verticalNormalizedPosition =1;
           
       }

       // Update is called once per frame
       void Update()
       {
           if (isDrag == false&&dragOnce)
           { 
               scrollRect.verticalNormalizedPosition = Mathf.Lerp(scrollRect.verticalNormalizedPosition,
                      targetVertivalPosition, Time.deltaTime * smoothing);//通过插值实现缓慢滚动
           }
       }
//Tab 点击
       public void OnTogglePage_1_Change(bool isOn)
       {
           if (isOn)
           {
               targetVertivalPosition = pageArray[3];
               dragOnce = true;
           }
         

       }
       public void OnTogglePage_2_Change(bool isOn)
       {
           if (isOn)
           {
               targetVertivalPosition = pageArray[2];
               dragOnce = true;
           }
           
       }
       public void OnTogglePage_3_Change(bool isOn)
       {
           if (isOn)
           {
               targetVertivalPosition = pageArray[1];
               dragOnce = true;
           }
          
       }
       public void OnTogglePage_4__Change(bool isOn)
       {
           if (isOn)
           {
               targetVertivalPosition = pageArray[0];
               dragOnce = true;
           }
          
       }
   }
}

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