Unity编辑器扩展

代码放在Assets/Editor中：

using UnityEngine;
using UnityEditor;

public class MyWindow : EditorWindow {
    const string MenuName = "Atwal Code Snippet";
    enum Code_Type
    {
        input_code,
        rigidbody_force_code,
        camera_follow
    }

    static Code_Type type = 0;
    static string Code_Name = "";

    [MenuItem(MenuName + "/H&V Input")]
    public static void Code_HVInput() {
        type = Code_Type.input_code;
        Code_Name = "H&V Input";
        GetWindow(typeof(MyWindow));
    }

    [MenuItem(MenuName + "/Rigidbody Force")]
    public static void Code_RigidbodyForce()
    {
        type = Code_Type.rigidbody_force_code;
        Code_Name = "Rigidbody Force";
        GetWindow(typeof(MyWindow));
    }

    [MenuItem(MenuName + "/Camera Follow")]
    public static void Code_CameraFollow()
    {
        type = Code_Type.camera_follow;
        Code_Name = "Camera Follow";
        GetWindow(typeof(MyWindow));
    }

    private void OnGUI()
    {
        Debug.Log(type);
        string content = "";
        switch(type)
        {
            case Code_Type.input_code:
                content = @"float moveHorizontal = Input.GetAxis(""Horizontal"");
float moveVertical = Input.GetAxis(""Vertical""); ";
                break;
            case Code_Type.rigidbody_force_code:
                content = @"Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical);
GetComponent<Rigidbody>().AddForce(movement * speed * Time.deltaTime); ";
                break;
            case Code_Type.camera_follow:
                content = @"public GameObject player;
private Vector3 offset;

// Use this for initialization
void Start () {
    //摄像机与跟随物体的初始相对位置
    offset = transform.position - player.transform.position;
}

// Update is called once per frame
void LateUpdate () {
    //跟随物体的位置加上相对位置
    transform.position = player.transform.position + offset;
}";
                break;
        }
        GUILayout.Label(Code_Name + " Code", EditorStyles.boldLabel);
        GUILayout.TextArea(content, GUILayout.ExpandHeight(true));
    }
}

效果：