ScrollRect.horizontalNormalizedPosition

Description

The horizontal scroll position as a value between 0 and 1, with 0 being at the left.

#pragma strict
// Required when Using UI elements.
public var myScrollRect;
public var newScrollBar;
public function Start() {
    //Change the current horizontal scroll position.
    myScrollRect.horizontalNormalizedPosition = 0.5f;
}

using UnityEngine;
using System.Collections;
using UnityEngine.UI;  // Required when Using UI elements.

public class ExampleClass : MonoBehaviour
{
    public ScrollRect myScrollRect;
    public Scrollbar newScrollBar;

    public void Start()
    {
        //Change the current horizontal scroll position.
        myScrollRect.horizontalNormalizedPosition = 0.5f;
    }
}