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直接用“移动行为”来播放移动音效的做法比较粗暴，后期右复杂需求后会有暴露一些问题，不过目前需求比较简单的话，可以先按这种方式做完。

代码如下

public float rotationSpeed = 3f;

private Rigidbody rigidbody;

public AudioSource audio;

// Use this for initialization

void Start()

{

rigidbody = this.GetComponent();

onFixedUpdate += CheckMove;

}

float speed = 10;

Action onFixedUpdate;

// Update is called once per frame

void FixedUpdate()

{

//float h = Input.GetAxis("Mouse X");

//float v = Input.GetAxis("Vertical");

//rigidbody.velocity = transform.forward * v * speed;

//rigidbody.angularVelocity = transform.up * h * rotationSpeed;

if (onFixedUpdate != null)

onFixedUpdate();

}

//移动所需参数

Vector2 movePara;

//检测移动状态

private void CheckMove()

{

movePara.x = Input.GetAxis("Mouse X");

movePara.y = Input.GetAxis("Vertical");

if (movePara != Vector2.zero && !isMoving)

BeginMove();

if (movePara == Vector2.zero && isMoving)

EndMove();

}

// 是否处于移动状态

private bool isMoving;

// 当前已经移动的时间

private float moveTime = 0;

///开始移动

private void BeginMove()

{

if (isMoving)

return;

isMoving = true;

moveTime = 0;

lastStepIndex = -1;

currStepIndex = -1;

soundInterval = 1.5f;//根据人物是走路/奔跑/冲刺调整脚步声的间隔

onFixedUpdate += Move;

}

// 已经播放音效的脚步编号

int lastStepIndex;

// 当前脚步编号

int currStepIndex;

// 每个脚步的时间间隔

float soundInterval;

// 移动

private void Move()

{

moveTime += Time.deltaTime;

rigidbody.velocity = transform.forward * movePara.x * speed;

rigidbody.angularVelocity = transform.up * movePara.y * rotationSpeed;

currStepIndex = (int)(moveTime / soundInterval);//每隔n秒就需要播放脚步身

if (currStepIndex > lastStepIndex)

{

lastStepIndex = currStepIndex;

audio.Play();

}

}

// 结束移动

private void EndMove()

{

if (!isMoving)

return;

isMoving = false;

onFixedUpdate -= Move;

if (audio.isPlaying)

audio.Stop();

}