Unity3d-在另一个脚本中定义事件

使用事件和委托。你可以找到一个简化的教程 here 如果这对你来说是新的。

public delegate void SelectAction(GameObject target);
public static event SelectAction OnSelectedEvent;

将其添加到您的 LanguageDropdown 脚本,您应该得到以下信息:

public class LanguageDropdown : MonoBehaviour, ISelectHandler// required interface when using the OnSelect method.
{
    public delegate void SelectAction(GameObject target);
    public static event SelectAction OnSelectedEvent;

    //Do this when the selectable UI object is selected.
    public void OnSelect(BaseEventData eventData)
    {
        Debug.Log(this.gameObject.name + " was selected");

        //Invoke Event
        if (OnSelectedEvent != null)
        {
            OnSelectedEvent(this.gameObject);
        }
    }
}

现在,您可以在 OnEnable 和 OnDisable 函数分别从另一个脚本编写脚本:

void OnEnable()
{
    //subscribe to event
    LanguageDropdown.OnSelectedEvent += SelectAction;
}

void OnDisable()
{
    //Un-subscribe to event
    LanguageDropdown.OnSelectedEvent -= SelectAction;
}

//This will be called when invoked
void SelectAction(GameObject target)
{
    Debug.Log(target.name + " was selected");
}

基本上我想知道我是否被迫附加脚本 语言下拉到游戏对象,或者如果这不是必需的,我 可以从另一个未附加到该脚本的脚本设置所有内容 具体下拉列表。

不,你可以使用 EventTrigger 类来注册以下事件,您无需将其附加到每个对象:

EventTrigger.Entry entry = new EventTrigger.Entry();
entry.eventID = EventTriggerType.Select;
entry.callback.AddListener((eventData) => { SelectAction(); });

求求你了 不 使用它。它很慢,我也从多个人那里验证了这一点。

以统一为中心的解决方案是使用 UnityEvent 这允许您在检查器中进行这些更改。

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

public class LanguageDropdown : MonoBehaviour, ISelectHandler// required interface when using the OnSelect method.
{
    public UnityEvent Selected;

    //Do this when the selectable UI object is selected.
    public void OnSelect(BaseEventData eventData)
    {
        Debug.Log(this.gameObject.name + " was selected");
        Selected.Invoke();
    }
}

然后 LanguageDropdown 挑选出来的 成员在检查器中可见,然后可以将对象和方法目标分配给该成员(很像按钮)。

注意:您可以更改 单位事件 到 UnityEvent<LanguageDropdown> 如果要包括源对象:

public class LanguageDropdown : MonoBehaviour, ISelectHandler// required interface when using the OnSelect method.
{
    public UnityEvent<LanguageDropdown> Selected;

    //Do this when the selectable UI object is selected.
    public void OnSelect(BaseEventData eventData)
    {
        Debug.Log(this.gameObject.name + " was selected");
        Selected.Invoke(this);
    }
}

然后,目标方法必须具有正确的参数列表

(即。 public void method(LanguageDropdown dropdown) )

您可以在另一个脚本中定义公共方法,并将其称为int OnSelect()

例如:

public interface IDropdownContext
{
    void OnDropdownSelected(BaseEventData eventData);
}

public class Test : MonoBehaviour, IDropdownContext
{

    public void OnDropdownSelected(BaseEventData eventData)
    {
        Debug.Log("OnDropdownSelected");
    }
}


public class LanguageDropdown : MonoBehaviour, ISelectHandler// required interface when using the OnSelect method.
{
    [SerializeField]
    public Test context;

    //Do this when the selectable UI object is selected.
    public void OnSelect(BaseEventData eventData)
    {
        Debug.Log(this.gameObject.name + " was selected");

        context.OnDropdownSelected(eventData);
    }
}