rimworld-animation-studio/Assets/Scripts/NumberValidator.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class NumberValidator : MonoBehaviour
{
    public InputField.CharacterValidation valiationType = InputField.CharacterValidation.Decimal;

    public void Start()
    {
        InputField inputField = GetComponent<InputField>();

        if (inputField)
        { 
            inputField.characterValidation = valiationType;

            if (valiationType == InputField.CharacterValidation.Decimal)
            { inputField.onEndEdit.AddListener(delegate { MakeDecimal(); }); }
        }
    }

    public void MakeDecimal()
    {
        InputField inputField = GetComponent<InputField>();

        if (inputField)
        { inputField.text = string.Format("{0:0.000}", float.Parse(inputField.text)); }
    }
}