EnemySpawnerEditor.cs

using UnityEditor;
using UnityEngine;

[CustomEditor(typeof(EnemySpawner))]
public class EnemySpawnerEditor : Editor
{
	private EnemySpawner _enemySpawner;

	public override void OnInspectorGUI()
	{
		_enemySpawner = (EnemySpawner)target;

		base.OnInspectorGUI();
		EditorGUILayout.MinMaxSlider(
			new GUIContent("Movement Speed"),
			ref _enemySpawner.MinMovementSpeed,
			ref _enemySpawner.MaxMovementSpeed,
			0f,
			100f);

		if (GUILayout.Button("Add Random Waypoint"))
			AddRandomWaypoint();
		if (GUILayout.Button("Add Static Route Waypoint"))
			AddStaticRouteWaypoint();

		RoundSpeedValues();

		DisableRendererAndCollider();

		StickSpawnerToGround();

		// Set the spawners name in the Hierarchy
		_enemySpawner.gameObject.name = _enemySpawner.ToString();
	}

	private void StickSpawnerToGround()
	{
		_enemySpawner.transform.rotation = Quaternion.identity;

		RaycastHit hitInfo;
		int layerMask = LayerMask.GetMask("EnvironmentAndGround");
		if (Physics.Raycast(_enemySpawner.transform.position, Vector3.down, out hitInfo, 2f, layerMask))
		{
			_enemySpawner.transform.position = new Vector3(_enemySpawner.transform.position.x, hitInfo.point.y, _enemySpawner.transform.position.z);
		}
	}
}