Help with touch input for iOS please!

Well, I have been working in a system for touch input for my project for weeks now. I've tried with several different codes but none of them work properly. Here are some of them:

 var i : int;
 var hit : RaycastHit;

  function Update () 
     {
         for(i = 0; i< Input.touchCount; i++)
             {    
                 var ray : Ray = Camera.main.ScreenPointToRay(Input.GetTouch(i).position);
                 if(Physics.Raycast(ray, hit))
                 {
                     if(collider.bounds.Contains(hit.transform.localPosition))
                     {
                         if(Input.GetTouch(i).phase == TouchPhase.Began)
                         {    
                             hit.transform.gameObject.SendMessage("OnTouchDown");
                         }
                         if(Input.GetTouch(i).phase == TouchPhase.Ended)
                         {    
                             hit.transform.gameObject.SendMessage("OnTouchUp");
                         }
                     }
                 }
             }
     }

The problem with this one is that it doesn't do anything when tapping objects that are inside other objects (children objects). Aside from that it works good.

Next:

 var i : int;
 var hit : RaycastHit;

 function Update () 
     {
         for(i = 0; i< Input.touchCount; i++)
             {
                 if(Input.GetTouch(i).phase == TouchPhase.Began)
                 {
                    var ray = Camera.mainCamera.ScreenPointToRay(Input.GetTouch(i).position);
                         if(Physics.Raycast(ray, hit))
                         {
                        hit.transform.gameObject.SendMessage("OnTouchDown");
                     }
                  }
                 
                 if(Input.GetTouch(i).phase == TouchPhase.Ended)
                    {
                     hit.transform.gameObject.SendMessage("OnTouchUp");
                    }
             }
     }

This code also works, but I think that for some reason it shoots a ton of rays on a single touch, the reason I believe this is because when I tap a button on the Main Menu of my game, it automatically taps the button that appears after selecting the first one. Another reason is that while playing, in theory if you tap a block it gives you one point and then the block disappears. When using this code, if you tap a block it gives you 9 points before disappearing.

Note: I am using this code as the "brain" for all the codes of the buttons (`class ScriptName extends TouchButtonScript`). I am using a 3DText with a box collider as my buttons.

Does anybody knows what I'm doing wrong? Thanks in advance.