unity音效管理器

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unity游戏制作时，经常需要播放音效，如果没有一个音效管理类，随时随地都可以播放音乐，不利于代码的管理。我们可以将所有关于音效集中到一个管理类当中，可以将这个音效管理器写成单例，也可以将它当作一个模块，和项目的其他模块通信。
以下提供了两种音效管理器的代码（可根据需求自己添加API或进行代码重构）：

using UnityEngine;

/// <summary>
/// 音效管理channel
/// </summary>
public class AudioChannels : MonoBehaviour {
    private const int AUDIO_CHANNEL_NUM = 8;
    private struct CHANNEL {
        public AudioSource channel;
        public float keyOnTime;
    };
    private CHANNEL[] m_channels;

    void Awake () {
        m_channels = new CHANNEL[AUDIO_CHANNEL_NUM];
        for (int i = 0; i < AUDIO_CHANNEL_NUM; i++) {
            m_channels[i].channel = gameObject.AddComponent<AudioSource>();
            m_channels[i].keyOnTime = 0;
        }

    }

    public int PlayOneShot(AudioClip clip,float volume  ,float pan ,float pitch = 1.0f)
    {   
        for (int i = 0; i < m_channels.Length ; i++) {
            if (m_channels[i].channel.isPlaying &&
                m_channels[i].channel.clip == clip &&
                m_channels[i].keyOnTime >= Time.time - 0.03f)
                return -1;
        }

        int oldest = -1;
        float time = 1000000000.0f;     
        for (int i = 0; i < m_channels.Length ; i++) {
            if (m_channels[i].channel.loop == false &&
                m_channels[i].channel.isPlaying && 
                m_channels[i].keyOnTime < time) {
                oldest = i;
                time =  m_channels[i].keyOnTime;
            }
            if (!m_channels[i].channel.isPlaying) {
                m_channels[i].channel.clip = clip;
                m_channels[i].channel.volume = volume;
                m_channels[i].channel.panStereo = pan;
                m_channels[i].channel.loop = false;
                m_channels[i].channel.pitch = pitch;
                m_channels[i].channel.Play();
                m_channels[i].keyOnTime = Time.time;
                return i;
            }
        }

        // 频道没有打开的情况
        if (oldest >= 0) {
            m_channels[oldest].channel.clip = clip;
            m_channels[oldest].channel.volume = volume;
            m_channels[oldest].channel.panStereo = pan;
            m_channels[oldest].channel.loop = false;
            m_channels[oldest].channel.pitch = pitch;
            m_channels[oldest].channel.Play();
            m_channels[oldest].keyOnTime = Time.time;
            return oldest;
        }
        return -1;
    }

    public int PlayLoop(AudioClip clip,float volume  ,float pan,float pitch = 1.0f )
    {
        for (int i = 0; i < m_channels.Length ; i++) {
            if (!m_channels[i].channel.isPlaying) {
                m_channels[i].channel.clip = clip;
                m_channels[i].channel.volume = volume;
                m_channels[i].channel.panStereo = pan;
                m_channels[i].channel.loop = true;
                m_channels[i].channel.pitch = pitch;
                m_channels[i].channel.Play();
                m_channels[i].keyOnTime = Time.time;
                return i;
            }
        }
        return -1;
    }

    public void StopAll()
    {
        foreach(CHANNEL channel in m_channels)
            channel.channel.Stop();       
    }

    public void Stop(int id)
    {
        if ( id >= 0 && id < m_channels.Length ) {
            m_channels[id].channel.Stop();
        }
    }       

}

第二种：

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

public class AudioManager : BaseManager {

    public AudioManager(GameFacade facade) : base(facade) { }
    private const string Sound_Prefix = "Sounds/";
    public const string Sound_Alert = "Alert";
    public const string Sound_ArrowShoot = "ArrowShoot";
    public const string Sound_Bg_Fast = "Bg(fast)";
    public const string Sound_Bg_Moderate = "Bg(moderate)";
    public const string Sound_ButtonClick = "ButtonClick";
    public const string Sound_Miss = "Miss";
    public const string Sound_ShootPerson = "ShootPerson";
    public const string Sound_Timer = "Timer";

    private AudioSource bgAudioSource;
    private AudioSource normalAudioSource;

    public override void OnInit()
    {
        GameObject audioSourceGO = new GameObject("AudioSource(GameObject)");
        bgAudioSource = audioSourceGO.AddComponent<AudioSource>();
        normalAudioSource = audioSourceGO.AddComponent<AudioSource>();

        PlaySound(bgAudioSource, LoadSound(Sound_Bg_Moderate),0.5f, true);
    }

    public void PlayBgSound(string soundName)
    {
        PlaySound(bgAudioSource, LoadSound(soundName), 0.5f, true);
    }
    public void PlayNormalSound(string soundName)
    {
        PlaySound(normalAudioSource, LoadSound(soundName), 1f);
    }

    private void PlaySound( AudioSource audioSource,AudioClip clip,float volume, bool loop=false)
    {
        audioSource.clip = clip;
        audioSource.volume = volume;
        audioSource.loop = loop;
        audioSource.Play();
    }
    private AudioClip LoadSound(string soundsName)
    {
        return Resources.Load<AudioClip>(Sound_Prefix + soundsName);
    }
}