Hello, everything works only that when the drag of the collider.

// Hello, everything works only that when the drag of the collider comes out, it stops following the finger, I want it to come out, follow it until you release the drag, please help,good a question my code applies the drag well, but when it leaves the radius of the collider, the object does not follow the trajectory of the drag it stays stopped until it touches the collider again, any help?.

using UnityEngine.UI; using System.Collections; using System.Collections.Generic; using UnityEngine;

public class SosteneryMantener : MonoBehaviour {

 // touch offset allows ball not to shake when it starts moving
 float deltaX, deltaY;


 // reference to Rigidbody2D component
 Rigidbody2D rb;


 // ball movement not allowed if you touches not the ball at the first time
 bool moveAllowed = false;


 // Use this for initialization
 void Start()
 {


     rb = GetComponent<Rigidbody2D>();


     // Add bouncy material tha ball
     PhysicsMaterial2D mat = new PhysicsMaterial2D();
     mat.bounciness = 0.99f;
     mat.friction = 0.4f;
     GetComponent<CircleCollider2D>().sharedMaterial = mat;


 }


 // Update is called once per frame
 void Update()
 {


     // Initiating touch event
     // if touch event takes place
     if (Input.touchCount > 0)
     {


         // get touch position
         Touch touch = Input.GetTouch(0);


         // obtain touch position
         Vector2 touchPos = Camera.main.ScreenToWorldPoint(touch.position);


         // get touch to take a deal with
         switch (touch.phase)
         {


             // if you touches the screen
             case TouchPhase.Began:


                 // if you touch the ball
                 if (GetComponent<Collider2D>() == Physics2D.OverlapPoint(touchPos))
                 {


                     // get the offset between position you touches
                     // and the center of the game object
                     deltaX = touchPos.x - transform.position.x;
                     deltaY = touchPos.y - transform.position.y;


                     // if touch begins within the ball collider
                     // then it is allowed to move
                     moveAllowed = true;


                     // restrict some rigidbody properties so it moves
                     // more  smoothly and correctly
                     rb.freezeRotation = true;
                     rb.velocity = new Vector2(0, 0);
                     rb.gravityScale = 0;
                     GetComponent<CircleCollider2D>().sharedMaterial = null;
                 }
                 break;


             // you move your finger
             case TouchPhase.Moved:
                 // if you touches the ball and movement is allowed then move
                 if (GetComponent<CircleCollider2D>() == Physics2D.OverlapPoint(touchPos) && moveAllowed)
                     rb.MovePosition(new Vector2(touchPos.x - deltaX, touchPos.y - deltaY));
                 break;


             // you release your finger
             case TouchPhase.Ended:


                 // restore initial parameters
                 // when touch is ended
                 moveAllowed = false;
                 rb.freezeRotation = false;
                 rb.gravityScale = 2;
                 PhysicsMaterial2D mat = new PhysicsMaterial2D();
                 mat.bounciness = 0.99f;
                 mat.friction = 0.4f;
                 GetComponent<CircleCollider2D>().sharedMaterial = mat;
                 break;
         }
     }
 }

}