PageView脚本

Assets/Scripts/UI/CustomControl/PageView.cs

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+using UnityEngine;
+using System.Collections;
+using UnityEngine.UI;
+using System.Collections.Generic;
+using UnityEngine.EventSystems;
+using System;
+
+public class PageView : MonoBehaviour, IBeginDragHandler, IEndDragHandler
+{
+    public int PageCount;
+    public float SlideSpeed = 4;  //滑动速度 
+    public float sensitivity = 0.3f;
+
+    public Action<int> OnPageChanged;
+
+    ScrollRect rect;      //滑动组件
+    private float targethorizontal = 0;    //滑动的起始坐标 
+    private bool isDrag = false;     //是否拖拽结束 
+    List<float> posList = new List<float>();//求出每页的临界角，页索引从0开始 
+    private int currentPageIndex = -1;
+
+    private bool stopMove = true;
+    private float startTime;
+
+    private float startDragHorizontal;
+
+
+    void Awake()
+    {
+        rect = transform.GetComponent<ScrollRect>();
+
+        int tSplitCount = Mathf.Max(1, PageCount);
+        float tDelta = tSplitCount > 1 ? (1f / (tSplitCount - 1)) : 1;
+
+        for (int i = 0; i < tSplitCount; i++)
+        {
+            posList.Add(tDelta * i);
+        }
+    }
+
+    void Update()
+    {
+        if (!isDrag && !stopMove)
+        {
+            startTime += Time.deltaTime;
+            float t = startTime * SlideSpeed;
+            rect.horizontalNormalizedPosition = Mathf.Lerp(rect.horizontalNormalizedPosition, targethorizontal, t);
+            if (t >= 1)
+                stopMove = true;
+        }
+    }
+
+    public void PageFix(int index)
+    {
+        PageTo(index, false);
+    }
+
+    public void PageScroll(int index)
+    {
+        PageTo(index);
+    }
+
+    public void PageTo(int index, bool pWithScroll = true)
+    {
+        if (index >= 0 && index < posList.Count)
+        {
+            if (currentPageIndex != index)
+            {
+                currentPageIndex = index;
+
+                if (OnPageChanged != null)
+                    OnPageChanged(index);
+            }
+
+            if (pWithScroll)
+            {
+                targethorizontal = posList[currentPageIndex]; //设置当前坐标，更新函数进行插值 
+                isDrag = false;
+                startTime = 0;
+                stopMove = false;
+            }
+            else
+            {
+                rect.horizontalNormalizedPosition = posList[index];
+            }
+        }
+        else
+        {
+            Debug.LogError("页码不存在");
+        }
+    }
+
+    public void OnBeginDrag(PointerEventData eventData)
+    {
+        isDrag = true;
+        startDragHorizontal = rect.horizontalNormalizedPosition;
+    }
+
+    public void OnEndDrag(PointerEventData eventData)
+    {
+        float posX = rect.horizontalNormalizedPosition;
+        posX += ((posX - startDragHorizontal) * sensitivity);
+        posX = posX < 1 ? posX : 1;
+        posX = posX > 0 ? posX : 0;
+        int index = 0;
+        float offset = Mathf.Abs(posList[index] - posX);
+        for (int i = 1; i < posList.Count; i++)
+        {
+            float temp = Mathf.Abs(posList[i] - posX);
+            if (temp < offset)
+            {
+                index = i;
+                offset = temp;
+            }
+        }
+        PageTo(index);
+    }
+}

Assets/Scripts/UI/CustomControl/PageView.cs.meta

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