Progress Bar Attribute/Drawer for Unity float Inspector

ProgressBarAttribute.cs

using UnityEngine;


public class ProgressBarAttribute : PropertyAttribute
{
	public string name = "Float";

	public ProgressBarAttribute(string name)
	{
		this.name = name;

	}// ProgressBarAttribute()

}// ProgressBarAttribute : PropertyAttribute

ProgressBarAttributeDrawer.cs

using UnityEngine;
using UnityEditor;

// put it in an Editor folder
[CustomPropertyDrawer(typeof(ProgressBarAttribute))]
public class ProgressBarAttributeDrawer : PropertyDrawer
{
	public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
	{
		// make sure we are drawing a float
		if(property.propertyType == SerializedPropertyType.Float)
		{
			float value = property.floatValue;

			ProgressBarAttribute progressBarAttribute = (ProgressBarAttribute)attribute;

			EditorGUI.ProgressBar(position, value, string.Format("{0} = {1:0.000}", progressBarAttribute.name, value));
		}
		else EditorGUI.HelpBox(position, "ProgressBarAttribute can only be applied to a Float !", MessageType.Warning);

	}// OnGUI()

}// ProgressBarAttributeDrawer : PropertyDrawer