可以扩展Action以使用ActionList参数，以便在运行时设置字段值。在本教程中，我们将为自定义Action提供接受GameObject参数代替GUI中的字段的能力。
参数涉及使用Lists，这意味着我们必须首先引入一个新库。在脚本的标题中，添加以下内容：
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| using System.Collections.Generic;
|
我们将参数存储为ID号，这与记录Constant ID的方式非常相似。但是，我们必须确保默认情况下将其设置为-1。添加到声明变量列表：
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| public int parameterID = -1;
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必须修改ShowGUI函数的重载以接受参数列表。
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| override public void ShowGUI (List<ActionParameter> parameters)
|
然后，我们将调用一个函数，该函数将显示参数选择器（如果有）。如果选择其中一个，我们将重置其他变量-否则，我们将正常显示GUI：
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| public override void ShowGUI (List<ActionParameter> parameters)
{
parameterID = Action.ChooseParameterGUI("GameObject to affect: ", parameters, parameterID, ParameterType.GameObject);
if (parameterID > 0)
{
constantID = 0;
objectToAffect = null;
}
else
{
objectToAffect = (GameObject)EditorGUILayout.ObjectField("GameObject to affect:", objectToAffect, typeof(GameObject), true);
newGravityState = EditorGUILayout.Toggle("New gravity state:", newGravityState);
constantID = FieldToID(objectToAffect, constantID);
objectToAffect = IDToField(objectToAffect, constantID, true);
}
}
|
最后，我们将更新AssignValues函数以接受参数，并根据需要重新分配游戏对象：
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| override public void AssignValues (List<ActionParameter> parameters)
{
objectToAffect = AssignFile (parameters, parameterID, constantID, objectToAffect);
}
|
我们的动作现在已经完成了——它将与GameObject、Prefab和ActionListParameter一起工作。
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| using UnityEngine;
using System.Collections.Generic;
#if UNITY_EDITOR
using UnityEditor;
#endif
namespace AC
{
[System.Serializable]
public class ActionGravity : Action
{
public override ActionCategory Category { get { return ActionCategory.Object; }}
public override string Title { get { return "Change gravity"; }}
public override string Description { get { return "Enables or disables a Rigidbody's Gravity checkbox"; }}
public GameObject objectToAffect;
public bool newGravityState;
public int constantID;
public int parameterID = -1;
public override float Run ()
{
if (objectToAffect && objectToAffect.GetComponent<Rigidbody>())
{
objectToAffect.GetComponent<Rigidbody>().useGravity = newGravityState;
}
if (!isRunning)
{
isRunning = true;
return defaultPauseTime;
}
else
{
isRunning = false;
return 0f;
}
}
public override void Skip ()
{
Run ();
}
public override void AssignValues(List<ActionParameter> parameters)
{
objectToAffect = AssignFile(parameters, parameterID, constantID, objectToAffect);
}
#if UNITY_EDITOR
public override void ShowGUI (List<ActionParameter> parameters)
parameterID = Action.ChooseParameterGUI("GameObject to affect: ", parameters, parameterID, ParameterType.GameObject);
if (parameterID > 0)
{
constantID = 0;
objectToAffect = null;
}
else
{
objectToAffect = (GameObject)EditorGUILayout.ObjectField("GameObject to affect:", objectToAffect, typeof(GameObject), true);
newGravityState = EditorGUILayout.Toggle("New gravity state:", newGravityState);
constantID = FieldToID(objectToAffect, constantID);
objectToAffect = IDToField(objectToAffect, constantID, true);
}
}
public override string SetLabel ()
{
return string.Empty;
}
#endif
}
}
|
