Unity - minimalist Button inspector drawer for zero-parameter methods

ButtonAttribute.cs

using System;
using UnityEngine;
#if UNITY_EDITOR
using System.Linq;
using System.Reflection;
using UnityEditor;
#endif

public class ButtonAttribute : Attribute
{
}

#if UNITY_EDITOR
[CustomEditor(typeof(MonoBehaviour), true)]
public class MonoBehaviourEditor : Editor
{
    public override void OnInspectorGUI()
    {
        DrawDefaultInspector();
        DrawButtons();
    }

    public void DrawButtons()
    {
        // Get all methods with no parameters
        var methods = target.GetType()
            .GetMethods(BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic)
            .Where(m => m.GetParameters().Length == 0);
        foreach (var method in methods)
        {
            // If the method has the [Button] attribute
            if (Attribute.GetCustomAttribute(method, typeof(ButtonAttribute)) != null)
            {
                // Draw the button and if clicked, invoke the method
                if (GUILayout.Button(ObjectNames.NicifyVariableName(method.Name)))
                {
                    foreach (var t in targets)
                    {
                        method.Invoke(t, null);
                    }
                }
            }
        }
    }
}
#endif

Usage: in your MonoBehaviours, add the [Button] attribute before any method with zero parameters that you'd like a handy inspector-clickable button for.