InputField.text

설명

The current value of the input field.

Note that null is invalid value for InputField.text.

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

public class Example : MonoBehaviour 
{
	public InputField mainInputField;
	
	public void Start()
	{
		mainInputField.text = "Enter Text Here...";
	}
}