Detect screen tap vs. drag

I have tried to edit the drag iphone script to get it so that when I touch the object, the player picks it up, and when it touches again, the object drops. This works, but I do not want the cube to be picked up or dropped if the player drags his finger before or after touching the object. I just cannot make it work. The script i have seems to only reference one or the other, either touchphase.began or touchphase.ended, but it will not register both. How can I solve this issue? The script is below.

 using UnityEngine;
 using System.Collections;
 
 public class DragIphone : MonoBehaviour {
 
     public float spring = 50.0f;
     public float damper = 5.0f;
     public float drag = 10.0f;
     public float angularDrag = 5.0f;
     public float distance = 0.2f;
     public bool attachToCenterOfMass = false;
     public Transform BoxPosition;
     private bool touched = false;
     private SpringJoint springJoint;
     private Touch touch;
     private Touch touch1;
     private Vector2 tposition; 
     
     void Update (){
         // Make sure the user touched the screen
 
         if (Input.touchCount==0){
             return;
         }
         
         Camera mainCamera = FindCamera();
             
         // We need to actually hit an object
         RaycastHit hit = new RaycastHit();
     
         touch = Input.GetTouch(0);
       //  touch1 = Input.GetTouch(1);
         if(touch.phase == TouchPhase.Began){
             print("began");
                               tposition = touch.position;
             if (!Physics.Raycast(mainCamera.ScreenPointToRay(touch.position),  out hit, 100.0f))
                     return;
             
             // We need to hit a rigidbody that is not kinematic
             if (!hit.rigidbody || hit.rigidbody.isKinematic)
                 return;
             
             
             if (!springJoint){
                 GameObject go = new GameObject("Rigidbody dragger");
                 
                 //Rigidbody is automatically added by SpringJoint
                 
                 springJoint = (SpringJoint)go.AddComponent ("SpringJoint");
                 go.rigidbody.isKinematic = true;
             }
             
             springJoint.transform.position = hit.rigidbody.transform.position;
               
             if (attachToCenterOfMass){
                 Vector3 anchor =  hit.rigidbody.transform.position;
               //  transform.TransformDirection(hit.rigidbody.centerOfMass)
                 anchor = springJoint.transform.InverseTransformPoint(anchor);
                 springJoint.anchor = anchor;
             }else{
                 springJoint.anchor = Vector3.zero;
             }
             
             springJoint.spring = spring;
             springJoint.damper = damper;
             springJoint.maxDistance = distance;
             springJoint.connectedBody = hit.rigidbody;
             
             StartCoroutine("DragObject", hit.distance);
              
         }
     }
     
     private int count;
     
     void start(){
         count = 0;
     }
     
     
     IEnumerator DragObject (float distance){
            if (touch.phase == TouchPhase.Began && touched == true){
                print("yes");
                             touched = false;}     
 
         else if(touch.phase == TouchPhase.Began && touched == false){
             touched = true;
         }
         
       // else if(touch.phase == iPhoneTouchPhase.Began && touched == true){
            //        touched = false;
           //    }
         
           
             float oldDrag = springJoint.connectedBody.drag;
             float oldAngularDrag = springJoint.connectedBody.angularDrag;
             springJoint.connectedBody.drag = drag;
             springJoint.connectedBody.angularDrag = angularDrag;
             Camera mainCamera = FindCamera();
             
             while (touched == true){
               //     touch.phase != iPhoneTouchPhase.Ended &&
                 //   touch.phase != iPhoneTouchPhase.Canceled            
                     Ray ray = mainCamera.ScreenPointToRay(touch.position);
                 springJoint.transform.position = new Vector3(BoxPosition.transform.position.x, BoxPosition.transform.position.y, BoxPosition.transform.position.z);
                 yield return 0;
             
             }
             if (springJoint.connectedBody)
             {
                 springJoint.connectedBody.drag = 0;
                 springJoint.connectedBody.angularDrag = 0;
                 springJoint.connectedBody = null;
             }
         
     }
     
   
     
     Camera FindCamera (){
         if (camera)
             return camera;
         else
             return Camera.main;
     }
 }