unity游戏教程 space shooter （游戏控制器）

为了更好地理解unity，模仿了教程，以下均为教程中的代码：

GameController.cs:

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

public class GameController : MonoBehaviour {

	public GameObject hazard;
	public Vector3 spawnValue;
	public int hazardCount;
	public float spawnWait;
	public float startWait;
	public float waveWait;


	private int score;
	public Text scoreText;

	public Text gameOverText;
	private bool gameOver;


	public Text restartText;
	private bool restart;


	// Use this for initialization
	void Start () {
		gameOverText.text = "";
		gameOver = false;

		restartText.text = "";
		restart = false;

		score = 0;
		UpdateScore ();
		StartCoroutine(SpawnWaves ());
	}

	void Update(){
		if(restart){
			if(Input.GetKeyDown(KeyCode.R)){
				Application.LoadLevel (Application.loadedLevel);
			}
		}
	}

	public void GameOver(){
		gameOver = true;
		gameOverText.text = "Game Over";

	}


	void UpdateScore(){
		scoreText.text = "Score:" + score;
	}

	public void addScore(int value){
		score += value;
		UpdateScore ();
	}



	IEnumerator SpawnWaves(){
		yield return new WaitForSeconds (startWait);
		while(true){
		for(int i=0;i<hazardCount;i++){
			Vector3 spawnPosition = new Vector3 (Random.Range(-spawnValue.x,spawnValue.x),spawnValue.y,spawnValue.z);
			Quaternion spawnRotation = Quaternion.identity;
			Instantiate (hazard,spawnPosition,spawnRotation);
			yield return new WaitForSeconds (spawnWait);
				if (gameOver){
					restart = true;
					restartText.text = "press 'R' to Restart";
				}
		    }
			yield return new WaitForSeconds (waveWait);

		}

	}
}