Input.inputString

説明

現フレームでキーボードで入力された文字を返します（読み取り専用）

ASCII 文字のみが inputString に含まれます。

The string can contain two special characters which should be handled: Character "\b" represents backspace.
Character "\n" represents return or enter.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    public GUIText gt;
    void Start() {
        gt = GetComponent<GUIText>();
    }
    void Update() {
        foreach (char c in Input.inputString) {
            if (c == "\b"[0])
                if (gt.text.Length != 0)
                    gt.text = gt.text.Substring(0, gt.text.Length - 1);
                
            else
                if (c == "\n"[0] || c == "\r"[0])
                    print("User entered their name: " + gt.text);
                else
                    gt.text += c;
        }
    }
}