unity OnBeigainDrag
时间: 2023-10-22 21:29:41 浏览: 56
OnBeginDrag is a Unity event function that is called when a drag action is initiated on a UI element that has a draggable component attached to it. This event is triggered when the user starts dragging the element.
You can use this event to perform certain actions when the drag gesture begins. For example, you can update the position of the dragged UI element, change its appearance, or start a specific behavior associated with the drag action.
To use OnBeginDrag in Unity, you need to implement the IBeginDragHandler interface in your script and define the OnBeginDrag function. Here's an example:
```csharp
using UnityEngine;
using UnityEngine.EventSystems;
public class DragHandler : MonoBehaviour, IBeginDragHandler
{
public void OnBeginDrag(PointerEventData eventData)
{
// Implement your logic here when the drag gesture starts
// For example, you can update the position of the dragged element
transform.position = eventData.position;
}
}
```
In this example, the OnBeginDrag function updates the position of the dragged UI element to match the current pointer position.
Remember to attach this script to your draggable UI element and ensure that you have an EventSystem in your scene to handle input events.