UGUI解决嵌套使用多个ScrollRect时的Drag拖动冲突问题

很简单，直接看代码：
 1 using UnityEngine.UI;
 2 using UnityEngine.EventSystems;
 3 using UnityEngine;
 4 
 5 /// <summary>
 6 /// 解决嵌套使用ScrollRect时的Drag冲突问题。请将该脚本放置到内层ScrollRect上(外层的ScrollRect的Drag事件会被内层的拦截)
 7 /// </summary>
 8 public class NestedScrollRect : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler
 9 {
10     /// <summary>
11     /// 外层被拦截需要正常拖动的ScrollRect，可不指定，默认在父对象中找
12     /// </summary>
13     public ScrollRect anotherScrollRect;
14     /// <summary>
15     /// 当前的ScrollRect（本脚本所放置的物体上）的拖动方向默认为上下拖动，否则为左右拖动型
16     /// </summary>
17     public bool thisIsUpAndDown = true;
18 
19     private ScrollRect thisScrollRect;
20 
21     void Awake ()
22     {
23         thisScrollRect = GetComponent<ScrollRect> ();
24         if (anotherScrollRect == null)
25             anotherScrollRect = GetComponentsInParent<ScrollRect> ()[1];
26     }
27 
28     public void OnBeginDrag (PointerEventData eventData)
29     {
30         anotherScrollRect.OnBeginDrag (eventData);
31     }
32 
33     public void OnDrag (PointerEventData eventData)
34     {
35         anotherScrollRect.OnDrag (eventData);
36         float angle = Vector2.Angle (eventData.delta, Vector2.up);
37         //判断拖动方向，防止水平与垂直方向同时响应导致的拖动时整个界面都会动
38         if (angle > 45f && angle < 135f)
39         {
40             thisScrollRect.enabled = !thisIsUpAndDown;
41             anotherScrollRect.enabled = thisIsUpAndDown;
42         }
43         else
44         {
45             anotherScrollRect.enabled = !thisIsUpAndDown;
46             thisScrollRect.enabled = thisIsUpAndDown;
47         }
48     }
49 
50     public void OnEndDrag (PointerEventData eventData)
51     {
52         anotherScrollRect.OnEndDrag (eventData);
53         anotherScrollRect.enabled = true;
54         thisScrollRect.enabled = true;
55     }
56 }