学习ULua之委托

ULua很不错的样子，不过对lua不太熟悉，就先不用它那个框架了

今天要实现的功能是用lua给UGUI的一个按钮添加一个点击响应~~~~

因为我觉得在使用Lua与C#交互，委托是最重要的部分，这样可以很灵活的响应宿主的事件，其它的姿势都比较明确，也不用多说

首先是一个类似以前NGUI绑定事件的脚本，大部分来自momo研究院，我给加了一个OnPress的事件

using UnityEngine;
using System.Collections;
using UnityEngine.EventSystems;

/// <summary>
/// UGUI中的按钮监听事件，像NGUI中的一样
/// </summary>
public class EventTriggerListener : UnityEngine.EventSystems.EventTrigger
{
public delegate void VoidDelegate(GameObject go);
public VoidDelegate onClick;
public VoidDelegate onDown;
public VoidDelegate onEnter;
public VoidDelegate onExit;
public VoidDelegate onUp;
public VoidDelegate onSelect;
public VoidDelegate onUpdateSelect;
public VoidDelegate onPress;//ex by yangxun

static public EventTriggerListener Get(GameObject go)
{
EventTriggerListener listener = go.GetComponent<EventTriggerListener>();
if (listener == null) listener = go.AddComponent<EventTriggerListener>();
return listener;
}
public override void OnPointerClick(PointerEventData eventData)
{
if (onClick != null) onClick(gameObject);
}
public override void OnPointerDown(PointerEventData eventData)
{
isPress = true;
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)
{
isPress = false;
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);
}
//ex by yangxun
protected bool isPress = false;
protected void OnPress() {
if (onPress != null)
onPress(gameObject);
}
void Update() {
if (isPress)
OnPress();
}
}

然后是测试的脚本：
using UnityEngine;
using System.Collections;

public class test : MonoBehaviour {

string luaStr = @"
import 'EventTriggerListener'

function click(obj)
print('lua click trigger! from GameObject:'.. obj.name);
end

function AddEvent()
luanet.load_assembly('UnityEngine');
GameObject = UnityEngine.GameObject;
btn = GameObject.Find('btn');
EventTriggerListener.Get(btn).onClick = click;
end

AddEvent();
";

// Use this for initialization
void Start () {
LuaScriptMgr LuaMgr = new LuaScriptMgr();
LuaMgr.Start();
LuaMgr.DoString(luaStr);
}
}


然后场景中GameObject->UI->Button创建一个按钮，并把它名字改成btn，因为我在lua代码里find的是这个名字。
把test脚本挂到场景中，就OK了

点击按钮，debug出了lua里写的提示字符串：