介绍

某些情况下需要在 Unity 进入播放模式运行前修改部分内容，退出播放模式后恢复修改。

环境

  • Unity 5.5.0

思路

Unity 虽然提供了 Unity - Scripting API: EditorApplication.playmodeStateChanged，但是此事件发生在播放状态改变之后，而实际是需要事件发生在播放状态改变之前。

但是 Unity 同时提供了 Unity - Scripting API: EditorApplication.update 与 Unity - Scripting API: EditorApplication.playmodeStateChanged，这样就可以实现了。

实现

To do something before and after Unity play - Gist

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using UnityEngine;
using UnityEditor;

[InitializeOnLoad]
public class PlaymodeHook
{
    static PlaymodeHook()
    {
        EditorApplication.update += Update;
        EditorApplication.playmodeStateChanged += PlaymodeStateChanged;
    }

    private static void Update()
    {
        if (!EditorApplication.isPlaying &&
            EditorApplication.isPlayingOrWillChangePlaymode)
        {
            BeforeEnterPlaymode();
        }
    }

    private static void PlaymodeStateChanged()
    {
        if (!EditorApplication.isPlaying &&
            !EditorApplication.isPlayingOrWillChangePlaymode)
        {
            AfterExitPlaymode();
        }
    }

    private static void BeforeEnterPlaymode()
    {
        Debug.Log("BeforeEnterPlaymode");
    }

    private static void AfterExitPlaymode()
    {
        Debug.Log("AfterExitPlaymode");
    }
}