// 比如：當點擊打開解釋說明的按鈕時候
  public void clickOpenExplainScene() {
    if (!explainScene.activeSelf) {
      explainScene.SetActive (true);
    } 
    if (startScene.activeSelf) {
      startScene.SetActive (false);
    }  
  }

// 實現(xiàn)背景音樂播放的單例類
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class BGSingleton : MonoBehaviour {

  private static BGSingleton instance = null;
  public AudioSource audioSource = null;

  public static BGSingleton getSingleton() {
    if (instance == null) {
      instance = new BGSingleton ();
    }
    return instance;
  }
  void Awake () {
    if (instance != null && instance != this) {
      Destroy (this.gameObject);
    } else {
      instance = this;
      Debug.Log ("create");
    }
    DontDestroyOnLoad (this.gameObject);
  }

//通過主界面上的開關(guān)button控制是否靜音
  public void IsPlay(bool isPlay) {
    if (isPlay == true) {
      audioSource.mute = false;
      Debug.Log ("play background music");
    } else {
      audioSource.mute = true;
    }
  }
}

// mapMove.cs
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class mapMove : MonoBehaviour {

  public float speed = 300f;
  public RectTransform tube1;
  public RectTransform tube2;

  private RectTransform transform;
  // Use this for initialization
  void Awake () {
    transform = GetComponent<RectTransform>(); 
  }

  // Update is called once per frame
  void Update () {

    // Translate：Moves the transform in the direction and distance of translation.

    // If you add or subtract to a value every frame chances are you should multiply with Time.deltaTime.
    // When you multiply with Time.deltaTime you essentially express: 
    // I want to move this object 10 meters per second instead of 10 meters per frame.
    transform.Translate (Vector3.left * Time.deltaTime * speed);

    // 如果前一個地圖移到-764以外的地方，重放到764
    if (transform.anchoredPosition.x <= -764) {

      transform.anchoredPosition = new Vector2 (764, 0);
      // 設(shè)置水管的位置為隨機出現(xiàn)，x不變，y隨機出現(xiàn)
      tube1.anchoredPosition = new Vector2 (tube1.anchoredPosition.x, Random.Range (-110, 200));
      tube2.anchoredPosition = new Vector2 (tube2.anchoredPosition.x, Random.Range (-110, 200));
    }
  }
}

// 碰撞檢測
  void OnTriggerEnter2D (Collider2D other)
  {
    // 如果鳥碰到柱子
    if (other.gameObject.CompareTag("tube")) {

      if (!gameOver.activeSelf) {
        gameOver.SetActive (true);
        audioManager.singer.setAudio (audioClipType.hit);
      }

      // 通過地圖的名字獲取到地圖移動腳本
      mapMove map1 = GameObject.Find ("map1").GetComponent<mapMove> ();
      map1.enabled = false;

      mapMove map2 = GameObject.Find ("map2").GetComponent<mapMove> ();
      map2.enabled = false;

      Rigidbody2D playerRigidBody2D = GameObject.Find ("player").GetComponent<Rigidbody2D> ();
      Destroy (playerRigidBody2D);

    }
  }

// playerController.cs
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class playerController : MonoBehaviour {

  private Rigidbody2D player;

  public AudioSource playerAudio;
  public float speed;
  // Use this for initialization
  void Start () {
    player = GetComponent<Rigidbody2D>();
    // 重置分數(shù)
    gameSingleton.getSingleton ().score = 0;
  }

  // Update is called once per frame
  void Update () {
    // 如果鳥被銷毀游戲結(jié)束了，直接返回
    if (player == null) { return; }

    // 當點擊鼠標，給鳥一個向上的速度
    if (Input.GetMouseButtonDown (0)) {
      player.velocity = new Vector2(0, speed);
//     audioManager.singer.setAudio (audioClipType.wing);
      // 因為翅膀的聲音和過柱子的聲音，不能是同個線程的
      if (!gameSingleton.getSingleton ().isMute) {
        playerAudio.Play();
      }

    }

    // 通過判斷鳥的速度正負設(shè)計鳥的頭的轉(zhuǎn)向，
    if (player.velocity.y > 0) {
      transform.eulerAngles = new Vector3 (0, 0, 45);
    } else {
      transform.eulerAngles = new Vector3 (0, 0, -45);
    }
  }

}

// gameSingleton.cs
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class gameSingleton {

  // 使用單例模式記錄分數(shù)
  // 顯然單例模式的要點有三個；一是某個類只能有一個實例；
  // 二是它必須自行創(chuàng)建這個實例；三是它必須自行向整個系統(tǒng)提供這個實例。
  // 從具體實現(xiàn)角度來說，就是以下三點：一是單例模式的類只提供私有的構(gòu)造函數(shù)，
  // 二是類定義中含有一個該類的靜態(tài)私有對象，三是該類提供了一個靜態(tài)的公有的函數(shù)用于創(chuàng)建或獲取它本身的靜態(tài)私有對象。

  public float score;
  public float bestScore;
  public bool isMute; // 用來控制音效
// public bool isFirstToPlay;

  // 含有一個靜態(tài)私有對象，這也是唯一一個對象
  private static gameSingleton singer;

  // 私有的構(gòu)造函數(shù)
  private gameSingleton () {
    score = 0;
    bestScore = 0;
    isMute = false;
//   isFirstToPlay = true;
  }

  // 提供一個靜態(tài)的公有函數(shù) 用于創(chuàng)建或獲取本身的靜態(tài)私有對象
  public static gameSingleton getSingleton() {
    if (singer == null) {
      singer = new gameSingleton ();
    }
    return singer;
  }

  public void setBestScore() {
    if (score > bestScore) {
      bestScore = score;
    }
  }

}