public void OnBeginDrag (EventSystems.PointerEventData eventData);

参数

eventData开始拖动时使用的值。

描述

拖动内容时的处理。

开始拖动时已选择控制柄。

// Enable the selection of a ScrollView which can be dragged.
// This script only chooses the ScrollView child of the Canvas.

using UnityEngine; using UnityEngine.EventSystems; using UnityEngine.UI;

public class ExampleScript : MonoBehaviour, IBeginDragHandler { private GameObject m_DraggingIcon;

public void Start() { m_DraggingIcon = new GameObject("icon"); }

public void OnBeginDrag(PointerEventData data) { Debug.Log("OnBeginDrag");

var canvas = FindInParents<Canvas>(gameObject); if (canvas == null) return;

m_DraggingIcon.transform.SetParent(canvas.transform, false); m_DraggingIcon.transform.SetAsLastSibling();

Debug.Log("Dragging started"); }

// locate and return the Canvas static public T FindInParents<T>(GameObject go) where T : Component { if (go == null) return null; var comp = go.GetComponent<T>();

if (comp != null) return comp;

Transform t = go.transform.parent; while (t != null &amp;&amp; comp == null) { comp = t.gameObject.GetComponent<T>(); t = t.parent; } return comp; } }