GameObject as toggle button with touch

I'm trying to make a gameobject as a toggle button which works with touch. here's my code which works but there's a problem. if you don't release your finger from screen the toggle button keeps toggling . I'm looking for something like "OnMouseRelease" function.

 function FixedUpdate()
 {
  if(Input.touchCount>0)
  {
   var theTouch : Touch = Input.GetTouch(0);
   var ray = Camera.main.ScreenPointToRay(theTouch.position);
   if(Physics.Raycast(ray,hit,500000,layerMask))
   {
    if(Input.touchCount==1)
    {
     var hitTag = hit.transform.tag;
     if(hit.transform.CompareTag("toggleBtn")
     {
      //do actions
     }
    }
   }
  }
 }

I tried to embrace it with a condition of TouchPhase.Began but it didn't work either . I also tried to add a boolean as a condition and make it active by a delay with yield but it didn't work either.