Version: 2018.4
public UI.InputField.OnValidateInput onValidateInput ;


The function to call to validate the input characters.

using UnityEngine;
using System.Collections;
using UnityEngine.UI; // Required when Using UI elements.

public class Example : MonoBehaviour { public InputField mainInputField;

public void Start() { // Sets the MyValidate method to invoke after the input field's default input validation invoke (default validation happens every time a character is entered into the text field.) mainInputField.onValidateInput += delegate(string input, int charIndex, char addedChar) { return MyValidate(addedChar); }; }

private char MyValidate(char charToValidate) { //Checks if a dollar sign is entered.... if (charToValidate == '$') { // ... if it is change it to an empty character. charToValidate = '\0'; } return charToValidate; } }