How to prevent FormatException from appearing when deleting text from InputField?

Questions & Answers
1

I want create to simple date checking functionality using InputFields. I set InputFields to only take integers with 2 to 4 character limit. In Update method i’m checking if it’s a leap year, but if I delete the whole number in the box I get FormatException error blocking the app. I use int.Parse() to convert InputField.text to integer and I think there is the problem, because when I delete number there is null. Is there is a way to implement exception, which will not stop the application?

Here is my code:

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

public class ButtonDisableTest : MonoBehaviour
{
    [Header("Inputs")]
    public InputField YearField;

    public bool leapYear;

    public int intYear;

    public void Start()
    {
        // getting the real date from another script
        GameObject Canvas = GameObject.Find("Canvas");
        DateTest date = Canvas.GetComponent<DateTest>();

        // here i need this or there will be FromatException from the start
        YearField.text = date.iYears.ToString();
    }

    // Update is called once per frame
    public void Update()
    {
        // getting the real date from another script
        GameObject Canvas = GameObject.Find("Canvas");
        DateTest date = Canvas.GetComponent<DateTest>();

        int intYear = int.Parse(YearField.text);

        if (intYear % 4 == 0)
        {
            if (intYear % 100 == 0)
            {
                if (intYear % 400 == 0)
                    leapYear = true;
                else
                    leapYear = false;
            } else
                leapYear = true;
        } else
            leapYear = false;

    }

    public void onButtonPressed()
    {
        Debug.Log("Button pressed" + leapYear);
    }
}
2

Put in a valid date instead of completely clearing it. Just like a BIOS would do, set it to the earliest date you want to handle as a default, or use the current date as a default.