Unity Button OnClick処理

例はボタンを押したら残機を増やす処理

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

public class IncrementZankiController : MonoBehaviour {

    public Text text;
    public Image heart1;
    public Image heart2;
    public Image heart3;

    public void IncrementLife(){
        Sprite image = Resources.Load<Sprite> ("heart_full");
        int life = int.Parse (text.text);
        if (life == 0) {
            heart1.sprite = image;
            life++;
        } else if (life == 1) {
            heart2.sprite = image;
            life++;
        } else if (life == 2) {
            heart3.sprite = image;
            life++;
        }
        text.text = life.ToString ();
    }
}