gistfile1.txt

using UnityEngine;
using UnityEditor;

[CustomEditor(typeof(MoveScreenInDevScene))]
public class MoveScreenInDevSceneInspector : Editor
{
    public override void OnInspectorGUI()
    {
        base.OnInspectorGUI();

        int size = 30;

        GUILayout.BeginHorizontal();

        if (GUILayout.Button("<", GUILayout.Width(size), GUILayout.Height(size))) {
            var rt = ((MoveScreenInDevScene)target).GetComponent<RectTransform>();
            rt.anchorMin = new Vector2(rt.anchorMin.x - 1.1f, rt.anchorMin.y);
            rt.anchorMax = new Vector2(rt.anchorMax.x - 1.1f, rt.anchorMax.y);
        }

        if (GUILayout.Button("/\\", GUILayout.Width(size), GUILayout.Height(size))) {
            var rt = ((MoveScreenInDevScene)target).GetComponent<RectTransform>();
            rt.anchorMin = new Vector2(rt.anchorMin.x, rt.anchorMin.y + 1.1f);
            rt.anchorMax = new Vector2(rt.anchorMax.x, rt.anchorMax.y + 1.1f);
        }

        if (GUILayout.Button("\\/", GUILayout.Width(size), GUILayout.Height(size))) {
            var rt = ((MoveScreenInDevScene)target).GetComponent<RectTransform>();
            rt.anchorMin = new Vector2(rt.anchorMin.x, rt.anchorMin.y - 1.1f);
            rt.anchorMax = new Vector2(rt.anchorMax.x, rt.anchorMax.y - 1.1f);
        }

        if (GUILayout.Button(">", GUILayout.Width(size), GUILayout.Height(size))) {
            var rt = ((MoveScreenInDevScene)target).GetComponent<RectTransform>();
            rt.anchorMin = new Vector2(rt.anchorMin.x + 1.1f, rt.anchorMin.y);
            rt.anchorMax = new Vector2(rt.anchorMax.x + 1.1f, rt.anchorMax.y);
        }

        GUILayout.EndHorizontal();
    }
}