1 using UnityEngine; 2 using System.Collections; 3 using UnityEngine.EventSystems; 4 using System; 5 using UnityEngine.UI; 6 public class LevelButtonScrollRect : MonoBehaviour, IBeginDragHandler, IEndDragHandler 7 { 8     private ScrollRect scrollRect; 9     private float[] pageArray = new float[] { 0, 0.333f, 0.666f, 1 };10     public Toggle[] ToggleArray;11     private float speed = 5f;12     private float targetHorizontalPosition = 0f;13     private bool isDraging = false;14     void Start()15     {16         scrollRect = transform.GetComponent<ScrollRect>();17     }18 19     void Update()20     {21         if (!isDraging)22         {23             scrollRect.horizontalNormalizedPosition = Mathf.Lerp(scrollRect.horizontalNormalizedPosition,24             targetHorizontalPosition, Time.deltaTime * speed);25         }26         27     }28     public void OnBeginDrag(PointerEventData eventData)29     {30         isDraging = true;31     }32     public void OnEndDrag(PointerEventData eventData)33     {34         isDraging = false;35         // 得到 水平滑动的 值  （0-1）36         float posX = scrollRect.horizontalNormalizedPosition;37         int index = 0;38         float offset = Mathf.Abs(posX - pageArray[index]);39         // 与 前后比较 距离最短40         for (int i = 1; i < pageArray.Length; i++)41         {42             // 距离 最短43             float offsetTemp = Mathf.Abs(posX - pageArray[i]);44             if (offset > offsetTemp)45             {46                 index = i;47                 offset = offsetTemp;48             }49         }50         targetHorizontalPosition = pageArray[index];51         ToggleArray[index].isOn = true;52     }53 }