知识点一： 暂停、继续游戏

 

可通过简单设置Time.timeScale = 0.0f 来暂停游戏，设置Time.timeScale=1.0f 来继续游戏；

效果如下截图所示：

 

具体代码实现如下：

using UnityEngine;
using System.Collections;

public class PauseGame : MonoBehaviour {

    public bool expensiveQualitySettings = true;

    private bool isPaused = false;

    private void Update ( ) {
        if ( Input.GetKeyDown( KeyCode.Escape ) ) {
            if ( isPaused )
            {
                ResumeGameMode();
            }
            else {
                PauseGameMode();
            }
        }
    }

    private void ResumeGameMode ( ) {
        Time.timeScale = 1.0f;
        isPaused = false;
        Screen.showCursor = false;
        //GetComponent<MouseLook>().enabled = true;
    }

    private void PauseGameMode ( ) {
        Time.timeScale = 0.0f;
        isPaused = true;
        Screen.showCursor = true;
        //GetComponent<MouseLook>().enabled = false;
    }

    private void OnGUI ( ) {
        if ( isPaused ) {
            PauseGameGUI();
        }
    }

    private void PauseGameGUI(){
        string[] names = QualitySettings.names;
        string message = "Game Pause. Press ESC to resume or select a new quality setting below.";
        GUILayout.BeginArea( new Rect(0, 0, Screen.width, Screen.height) );
        GUILayout.FlexibleSpace();
        GUILayout.BeginHorizontal();
        GUILayout.FlexibleSpace();
        GUILayout.BeginVertical();
        GUILayout.Label( message, GUILayout.Width(200) );
        for ( int i = 0; i < names.Length; i++ ) {
            if ( GUILayout.Button( names[i], GUILayout.Width(200) ) ) {
                QualitySettings.SetQualityLevel( i, expensiveQualitySettings );
            }
        }
        GUILayout.EndVertical();
        GUILayout.FlexibleSpace();
        GUILayout.EndHorizontal();
        GUILayout.FlexibleSpace();
        GUILayout.EndArea();
    }
}