新人求助

bool isTransit;
bool direction;
public float roatetTime;
public float rotateAngle;
public Transform knob;
void Update()
{
if (Input.GetKeyDown(KeyCode.K))
{
if (isTransit)
{
return;
}
if (!direction)
{
direction = true;
StartCoroutine(Rotate(true));
}
else
{
direction = false;
StartCoroutine(Rotate(false));
}
}
}
IEnumerator Rotate(bool direction)
{
isTransit = true;
Quaternion sRot = knob.localRotation;
Quaternion eRot = direction ? Quaternion.Euler(0.0f, 0.0f, rotateAngle) : Quaternion.identity;
float stime = Time.time;
float ratio = 0.0f;
while (ratio < 1.0f)
{
knob.localRotation = Quaternion.Lerp(sRot, eRot, ratio);
yield return null;
ratio = (Time.time - stime) / roatetTime;
}
knob.localRotation = eRot;
isTransit = false;
}