using UnityEngine;using System.Collections;public class Test : MonoBehaviour {private Vector3 screenPoint;private Vector3 offset;// Update is called once per framevoid Update () {for (int i = 0; i < Input.touchCount; ++i) {if (Input.GetTouch(i).phase == TouchPhase.Began) {screenPoint = Camera.main.WorldToScreenPoint(gameObject.transform.position);offset = gameObject.transform.position - Camera.main.ScreenToWorldPoint(new Vector3(Input.GetTouch(i).position.x, Input.GetTouch(i).position.y, screenPoint.z));}if(Input.GetTouch(i).phase == TouchPhase.Moved) {Vector3 curScreenPoint = new Vector3(Input.GetTouch(i).position.x, Input.GetTouch(i).position.y, screenPoint.z);Vector3 curPosition = Camera.main.ScreenToWorldPoint(curScreenPoint) + offset;transform.position = curPosition;}}}}
