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Unity3d使用UGUI实现长按功能

2024-10-27 15:20:02   205人阅读

  UGUI的Button组件只有OnClick事件的监听，要实现长按功能，要监听按下事件和抬起事件，所以要使用到EventTrigger组件中的OnPointerDown和OnPointerUp来监听。

为了方便，把EventTrigger中的事件监听都封装起来，我是使用了雨松MOMO写的EventTriggerListener，用起来很方便，地址：http://www.xuanyusong.com/archives/3325

代码：

using UnityEngine;using System.Collections;using UnityEngine.EventSystems;public class EventTriggerListener : UnityEngine.EventSystems.EventTrigger{    public delegate void VoidDelegate(GameObject go);    public delegate void BoolDelegate(GameObject go, bool state);    public delegate void FloatDelegate(GameObject go, float delta);    public delegate void VectorDelegate(GameObject go, Vector2 delta);    public delegate void ObjectDelegate(GameObject go, GameObject obj);    public delegate void KeyCodeDelegate(GameObject go, KeyCode key);    public VoidDelegate onClick;    public VoidDelegate onDown;    public VoidDelegate onEnter;    public VoidDelegate onExit;    public VoidDelegate onUp;    public VoidDelegate onSelect;    public VoidDelegate onUpdateSelect;    static public EventTriggerListener Get(GameObject go)    {        EventTriggerListener listener = go.GetComponent<EventTriggerListener>();        if (listener == null) listener = go.AddComponent<EventTriggerListener>();        return listener;    }    static public EventTriggerListener Get(Transform transform)    {        EventTriggerListener listener = transform.GetComponent<EventTriggerListener>();        if (listener == null) listener = transform.gameObject.AddComponent<EventTriggerListener>();        return listener;    }    public override void OnPointerClick(PointerEventData eventData)    {        if (onClick != null) onClick(gameObject);    }    public override void OnPointerDown(PointerEventData eventData)    {        if (onDown != null) onDown(gameObject);    }    public override void OnPointerEnter(PointerEventData eventData)    {        if (onEnter != null) onEnter(gameObject);    }    public override void OnPointerExit(PointerEventData eventData)    {        if (onExit != null) onExit(gameObject);    }    public override void OnPointerUp(PointerEventData eventData)    {        if (onUp != null) onUp(gameObject);    }    public override void OnSelect(BaseEventData eventData)    {        if (onSelect != null) onSelect(gameObject);    }    public override void OnUpdateSelected(BaseEventData eventData)    {        if (onUpdateSelect != null) onUpdateSelect(gameObject);    }}

 

使用EventTriggerListener的Get方法就可以了，和NGUI的UIEventListener一样。

例如：

EventTriggerListener.Get(gameObject).onDown += OnClickDown;EventTriggerListener.Get(gameObject).onUp += OnClickUp;

然后在场景中添加一个按钮

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然后再按钮上挂一个事件监听的脚本，譬如我要做一个类似技能CD冷却的效果，点击开始遮罩，松开恢复原状。

脚本如下：

using UnityEngine;using System.Collections;using UnityEngine.UI;public class EventTest : MonoBehaviour {    private bool isUp;    private Image img;    void Start () {        /*EventTriggerListener.Get(gameObject).onDown += (go) => { Debug.Log("按下！"); };        EventTriggerListener.Get(gameObject).onUp += (go) => { Debug.Log("抬起！"); };        EventTriggerListener.Get(gameObject).onSelect += (go) => { Debug.Log("选中！"); };        EventTriggerListener.Get(gameObject).onEnter += (go) => { Debug.Log("进入！"); };        EventTriggerListener.Get(gameObject).onExit += (go) => { Debug.Log("退出！"); };         * */        img = transform.Find("Image").GetComponent<Image>();        EventTriggerListener.Get(gameObject).onDown += OnClickDown;        EventTriggerListener.Get(gameObject).onUp += OnClickUp;    }    void OnClickDown(GameObject go)    {        isUp = false;        StartCoroutine(grow());    }    void OnClickUp(GameObject go)    {        isUp = true;        img.fillAmount = 0f;    }    private IEnumerator grow()    {        while (true)        {            if (isUp)            {                                break;            }            img.fillAmount += 0.5f * Time.deltaTime;            if (img.fillAmount == 0)            {                break;            }            yield return null;        }    }}

长按效果：

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Unity3d使用UGUI实现长按功能


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