Unity3D——利用單例創建並永久化遊戲對象（單例模式的應用）

基類單例類：

using UnityEngine;
using System.Collections;

public class SingleClass<T> : MonoBehaviour where T: MonoBehaviour{
	private static T _instance;
	/// <summary>
	/// Gets the instance.
	/// </summary>
	/// <returns>The instance.</returns>
	public static T GetInstance() {
		if (_instance == null) {
			GameObject obj = new GameObject();
			obj.name = typeof(T).ToString();
			_instance = obj.AddComponent<T>();
			DontDestroyOnLoad(obj);
		}
		return _instance;
	}
}

使用方法：（實例化一個管理音效的對象）

using UnityEngine;
using System.Collections;

public class AudioManager : MonoBehaviour {
	
	#region variable
	private static AudioSource bgmSource;
	private static AudioManager _instance;
	#endregion

	#region Attributes
	#endregion

	public void PlayBackgroundMusic(string musicName, bool loop = false) {
		bgmSource.clip = Resources.Load(musicName) as AudioClip;
		bgmSource.loop = loop;
		bgmSource.Play();
	}

	public void SetBackgroundMusicVol(float vol) {
		bgmSource.volume = vol;
	}
	public void ChangeBackgroundMusicStatus() {
		if (bgmSource.isPlaying) {
			bgmSource.Pause();
		} else {
			bgmSource.UnPause();
		}
	}
	public void PlayEffect(string effectName, float timer) {
		GameObject obj = new GameObject();
		obj.name = effectName;
		AudioSource source = obj.AddComponent<AudioSource>();
		source.clip = Resources.Load(effectName) as AudioClip;
		source.playOnAwake = false;
		source.Play();
		Destroy(obj, timer);
	}
	
	public static AudioManager GetInstance() {
		if (!_instance) {
			GameObject obj = new GameObject();
			obj.name = typeof(AudioManager).ToString();
			bgmSource = obj.AddComponent<AudioSource>();
			bgmSource.clip = Resources.Load("Sounds/background") as AudioClip;
			bgmSource.playOnAwake = false;
			_instance = obj.AddComponent<AudioManager>();
			DontDestroyOnLoad(obj);
		}
		return _instance;
	}
}