GrabController.cs

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

public class GrabController : MonoBehaviour {
    public GameObject handObject;
    public float detectionRadius;

    private bool hasObject = false;
    private bool inPlace = false;
    private Collider2D[] arounds;
    private GameObject grabbedObject;

    private AudioManager audioManagerScript; 
    private GameController gameControllerScript;
    private void Awake() {
        gameControllerScript = FindObjectOfType<GameController>();
        audioManagerScript = FindObjectOfType<AudioManager>();
    }
    private void OnDrawGizmos() {
        Gizmos.color = Color.yellow;
        Gizmos.DrawWireSphere(this.transform.position, detectionRadius);
    }

    private void Update() {
        CheckAround();
        if (Input.GetMouseButtonDown(0) && !hasObject)
            Grab();
        if (Input.GetMouseButtonUp(0) && hasObject && inPlace)
            stickObject();
        else if (Input.GetMouseButtonUp(0) && hasObject)
            Drop();
    }

    private void CheckAround() {
        arounds =
            Physics2D.OverlapCircleAll(transform.position, detectionRadius);
    }

    private void Grab() {
        if (arounds != null) {
            for (int i = 0; i < arounds.Length && !hasObject; i++) {
                Debug.Log(i);
                if (!hasObject && arounds[i].gameObject.tag == "Caja") {
                    Debug.Log("picking obj");
                    //pillar objeto
                    grabbedObject = arounds[i].gameObject;
                    takeOutPhysics(grabbedObject);
                    grabbedObject.transform.position = handObject.transform.position;
                    grabbedObject.transform.parent = handObject.transform;
                    hasObject = true;
                    audioManagerScript.PlayCatch();
                }
            }
        }
    }

    public void Drop() {
        if (hasObject) {
            grabbedObject.transform.parent = null;
            returnPhysics(grabbedObject);
            grabbedObject = null;
            hasObject = false;
        }
    }

    private void takeOutPhysics(GameObject pickup) {
        pickup.GetComponent<Rigidbody2D>().simulated = false;
        pickup.GetComponent<BoxCollider2D>().enabled = false;
    }

    private void returnPhysics(GameObject pickup) {
        pickup.GetComponent<Rigidbody2D>().simulated = true;
        pickup.GetComponent<BoxCollider2D>().enabled = true;
    }


    private void OnTriggerEnter2D(Collider2D collision) {
        if (hasObject) {
            Debug.Log("Una cosa" + collision.gameObject + " y lo otro " + grabbedObject.GetComponent<ObjectController>().originalTransform);
            if (collision.gameObject.tag == "Zone" && hasObject && collision.gameObject == grabbedObject.GetComponent<ObjectController>().originalTransform) {
                inPlace = true;
            }
        }
    }
    private void OnTriggerExit2D(Collider2D collision) {
        inPlace = false;
    }
    private void stickObject() {
        takeOutPhysics(grabbedObject);
        Quaternion originalRotation = grabbedObject.GetComponent<ObjectController>().getOriginalRotation();
        Transform originalTransform = grabbedObject.GetComponent<ObjectController>().getOriginalTransform();
        grabbedObject.transform.rotation = Quaternion.Slerp(grabbedObject.transform.rotation, originalRotation, Time.deltaTime * 180f);
        grabbedObject.transform.position = originalTransform.position;
        grabbedObject.transform.parent = null;

        grabbedObject.GetComponent<ObjectController>().placed = true;
        this.gameControllerScript.ObjectPlaced();
        this.hasObject = false;

    }
}