Giới thiệu UI trong lập trình game với Unity3D

using UnityEngine;
using System.Collections;

public class BirController : MonoBehaviour {

    public float flyPower = 100;

    public AudioClip flyClip;
    public AudioClip gameOverClip;

    private AudioSource audioSource;

    GameObject obj;
    GameObject gameController;
	// Use this for initialization
	void Start () {
        obj = gameObject;
        audioSource = obj.GetComponent<AudioSource>();
        audioSource.clip = flyClip;

        if (gameController == null)
        {
            gameController = GameObject.FindGameObjectWithTag("GameController");
        }
	}
	
	// Update is called once per frame
	void Update () {
	    if (Input.GetMouseButton(0))
        {
            audioSource.Play();
            obj.GetComponent<Rigidbody2D>().AddForce(new Vector2(0, flyPower));
        }
	}

    void OnCollisionEnter2D(Collision2D other)
    {
        EndGame();
    }    

    void EndGame()
    {
        audioSource.clip = gameOverClip;
        audioSource.Play();
        gameController.GetComponent<GameController>().EndGame();
    }
}
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using UnityEngine;
using System.Collections;

public class BirController : MonoBehaviour {

    public float flyPower = 100;

    public AudioClip flyClip;
    public AudioClip gameOverClip;

    private AudioSource audioSource;

    GameObject obj;
    GameObject gameController;
	// Use this for initialization
	void Start () {
        obj = gameObject;
        audioSource = obj.GetComponent<AudioSource>();
        audioSource.clip = flyClip;

        if (gameController == null)
        {
            gameController = GameObject.FindGameObjectWithTag("GameController");
        }
	}
	
	// Update is called once per frame
	void Update () {
	    if (Input.GetMouseButton(0))
        {
            audioSource.Play();
            obj.GetComponent<Rigidbody2D>().AddForce(new Vector2(0, flyPower));
        }
	}

    void OnCollisionEnter2D(Collision2D other)
    {
        EndGame();
    }    

    void EndGame()
    {
        audioSource.clip = gameOverClip;
        audioSource.Play();
        gameController.GetComponent<GameController>().EndGame();
    }
}
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using UnityEngine;
using System.Collections;

public class WallMove : MonoBehaviour {

    public float moveSpeed;
    public float minY;
    public float maxY;

    public float oldPosition;
    private GameObject obj;
    // Use this for initialization
    void Start()
    {
        obj = gameObject;
        oldPosition = 10;
        moveSpeed = 5;
        minY = -1;
        maxY = 1;
    }

    // Update is called once per frame
    void Update()
    {
        obj.transform.Translate(new Vector3(-1 * Time.deltaTime * moveSpeed, 0, 0));        
    }

    void OnTriggerEnter2D(Collider2D other)
    {
        if (other.gameObject.tag.Equals("ResetWall"))
            obj.transform.position = new Vector3(oldPosition, Random.Range(minY, maxY + 1), 0);
    }
}
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using UnityEngine;
using System.Collections;
using UnityEngine.SceneManagement;
using UnityEngine.UI;
using System.Reflection.Emit;

public class GameController : MonoBehaviour {

    public bool isEndGame;
    bool isStartFirstTime = true;
    int gamePoint = 0;
    public Text txtPoint;
    public GameObject pnlEndGame;
    public Text txtEndPoint;
    public Button btnRestart;

    public Sprite btnIdle;
    public Sprite btnHover;
    public Sprite btnClick;

    // Use this for initialization
    void Start () {
        Time.timeScale = 0;
        isEndGame = false;
        isStartFirstTime = true;
        pnlEndGame.SetActive(false);
    }
	
	// Update is called once per frame
	void Update () {
        if (isEndGame)
        {
            if (Input.GetMouseButtonDown(0) && isStartFirstTime)
            {
                StartGame();
            }
        }       
        else
        {
            if (Input.GetMouseButtonDown(0))
            {
                Time.timeScale = 1;
            }
        } 
	}

    public void RestartButtonClick()
    {
        btnRestart.GetComponent<Image>().sprite = btnClick;
    }

    public void RestartButtonHover()
    {
        btnRestart.GetComponent<Image>().sprite = btnHover;
    }

    public void RestartButtonIdle()
    {
        btnRestart.GetComponent<Image>().sprite = btnIdle;
    }

    public void GetPoint()
    {
        gamePoint++;
        txtPoint.text = "Point: " + gamePoint.ToString();
    }

    void StartGame()
    {
        SceneManager.LoadScene(0);
    }

    public void Restart()
    {
        StartGame();
    }

    public void EndGame()
    {
        isEndGame = true;
        isStartFirstTime = false; ;
        Time.timeScale = 0;
        pnlEndGame.SetActive(true);
        txtEndPoint.text = "Your point\n" + gamePoint.ToString();
    }
}
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