C# Script for Moving an Object when screen is held

Hi, in my game I want to make it so that player object's y position will move -1 when the user touches and holds their finger on the screen (the app is for android). So far it just moves by -1 each time the screen it tapped but not held. Can someone help me write a script for this in C# please?
Here is my current code -

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class PlayerMovement : MonoBehaviour {
5.  
6.     public GameObject Player;
7.  
8.     // Update is called once per frame
9.     void Update () {
10.         if(Input.GetMouseButtonDown(0))
11.         transform.position = new Vector3(transform.position.x, transform.position.y - 1, transform.position.z);
12.  
13.     }
14. }

 

http://forum.unity3d.com/threads/using-code-tags-properly.143875/

you need to do the inverse position change with Input.GetMouseButtonUp(0), i.e. when they let go

 

Are you able to give me an example please? I am a beginner with C#

 

I'm not very familiar with touch screen stuff but you can try this http://answers.unity3d.com/questions/977120/how-to-replace-input-axis-keyboard-button-with-tou.html

 

As far as I'm aware Input.GetMouseButtonDown() works the same as touch screen I just need someone to help me figure out how to make it move the entire time someone holds their finger/mouse button down on the screen it will move and when they lift it off it will stop.

 

This would be what you're after.

Code (CSharp):

1.     public float speed = 5f;
2.     private Vector3 playerPosition;
3.     private bool isMoving;
4.    
5.     void Update () {
6.    
7.         playerPosition = transform.position;
8.         if(Input.GetMouseButtonDown(0))
9.         {
10.             isMoving = true;
11.         }
12.         else if(Input.GetMouseButtonUp (0))
13.         {
14.             isMoving = false;
15.         }
16.    
17.         if(isMoving)
18.         {
19.             playerPosition.y += -1 * speed * Time.deltaTime;
20.             transform.position = playerPosition;
21.         }
22.     }

 

This is perfect! Thank you so much I really appreciate this