Unity之UGUI翻頁效果

 

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

public class PageView : MonoBehaviour, IBeginDragHandler, IEndDragHandler
{
    public ScrollRect rect;
    private float targethorizontal = 0;
    private List<float> posList = new List<float>();//存位置
    private bool isDrag = true;
    private float startTime = 0;
    private float startDragHorizontal;
    private int curIndex = 0;

    public float speed = 4;      //滑動速度  
    public float sensitivity = 0;
    public ToggleGroup toggleGroup;
    List<Toggle> toggleArray = new List<Toggle>();

   // public CallBack<int> callbackPrevDrag;
  ///  public CallBack<int> callbackNextDrag;

    //重新初始化一下
    public void initialize()
    {
        posList.Clear();
        float horizontalLength = rect.content.rect.width - GetComponent<RectTransform>().rect.width;
        var _rectWidth = GetComponent<RectTransform>().rect.width;
        for (int i = 0; i < rect.content.transform.childCount; i++)
        {
            posList.Add(_rectWidth * i / horizontalLength);
        }
        curIndex = 0;


        for (int i = 0; i < toggleGroup.transform.childCount; ++i)
        {
            toggleArray.Add(toggleGroup.transform.GetChild(i).GetComponent<Toggle>());
        }
        if (toggleArray.Count > 0)
        {
            for (int i = 0; i < toggleArray.Count; i++)
            {
                toggleArray[i].isOn = false;
            }
            toggleArray[0].isOn = true;
        }

    }

    public void destroy()
    {
        isDrag = true;
        startTime = 0;
        curIndex = 0;
        speed = 4;
        sensitivity = 0;
        posList.Clear();
        toggleArray.Clear();
    }

    void Awake()
    {
        rect = GetComponent<ScrollRect>();
        toggleGroup = transform.Find("toggleGroup").GetComponent<ToggleGroup>();
        initialize();
    }

    void Update()
    {
        if (!isDrag)
        {
            startTime += Time.deltaTime;
            float t = startTime * speed;
            rect.horizontalNormalizedPosition = Mathf.Lerp(rect.horizontalNormalizedPosition, targethorizontal, t);  //加速滑動效果
            //rect.horizontalNormalizedPosition = Mathf.Lerp(rect.horizontalNormalizedPosition, targethorizontal, Time.deltaTime * speed); //緩慢勻速滑動效果

        }
    }

    public void OnBeginDrag(PointerEventData eventData)
    {
        //Debug.Log("OnBeginDrag");
        isDrag = true;
        //開始拖動
        startDragHorizontal = rect.horizontalNormalizedPosition;
        //Debug.Log("start startDragHorizontal:" + startDragHorizontal);
    }

    public void OnEndDrag(PointerEventData eventData)
    {
        //Debug.Log("OnEndDrag");
        float posX = rect.horizontalNormalizedPosition;
        //Debug.Log("end posX:" + posX);
        /*
        int index = 0;
        float offset = Mathf.Abs(posList[index] - posX);  //計算當前位置與第一頁的偏移量
        for (int i = 1; i < posList.Count; i++)
        {    //遍歷頁籤，選取偏移量最小的那個頁面
            float temp = Mathf.Abs(posList[i] - posX);
            if (temp < offset)
            {
                index = i;
                offset = temp;
            }
        }
        curIndex = index;*/

        if (Mathf.Abs(startDragHorizontal - posX) >= 0.02f)
        {
            if (startDragHorizontal - posX > 0)
            {
                curIndex--;
                if (curIndex < 0)
                {
                    curIndex = 0;
                }
               // callbackPrevDrag?.Invoke(curIndex);
            }
            else
            {
                curIndex++;
                if (curIndex >= posList.Count)
                {
                    curIndex = posList.Count - 1;
                }
              //  callbackNextDrag?.Invoke(curIndex);
            }
        }
        targethorizontal = posList[curIndex]; //設置當前座標，更新函數進行插值  
        isDrag = false;
        startTime = 0;
        if (toggleArray.Count > 0)
        {
            toggleArray[curIndex].isOn = true;
        }
        //Debug.Log("OnEndDrag:" + curIndex);

    }

    public void pageTo(int index)
    {
        Debug.Log("pageTo......");
        curIndex = index;
        targethorizontal = posList[curIndex]; //設置當前座標，更新函數進行插值  
        isDrag = false;
        startTime = 0;
        toggleArray[curIndex].isOn = true;
      //  callbackNextDrag?.Invoke(curIndex);
    }
}

上次沒有翻頁Tooge效果，更新一下https://blog.csdn.net/weixin_41814169/article/details/88890650