SpriteStretch Script

using UnityEngine;
using System.Collections;
#if UNITY_EDITOR
[ExecuteInEditMode]
#endif
public class SpriteStretch : MonoBehaviour {
public enum Stretch{Horizontal, Vertical, Both};
public Stretch stretchDirection = Stretch.Horizontal;
public Vector2 offset = new Vector2(0f,0f);

SpriteRenderer sprite;
Transform _thisTransform;


void Start ()
{
_thisTransform = transform;
sprite = GetComponent<SpriteRenderer>();
StartCoroutine("stretch");
}
#if UNITY_EDITOR
void Update()
{
scale();
}
#endif
IEnumerator stretch()
{
yield return new WaitForEndOfFrame();
scale();
}
void scale()
{
float worldScreenHeight = Camera.main.orthographicSize *2f;
float worldScreenWidth = worldScreenHeight / Screen.height * Screen.width;
float ratioScale = worldScreenWidth / sprite.sprite.bounds.size.x;
ratioScale += offset.x;
float h = worldScreenHeight /  sprite.sprite.bounds.size.y;
h += offset.y;
switch(stretchDirection)
{
case Stretch.Horizontal:
_thisTransform.localScale = new Vector3(ratioScale,_thisTransform.localScale.y,_thisTransform.localScale.z);
break;
case Stretch.Vertical:
_thisTransform.localScale = new Vector3(_thisTransform.localScale.x, h,_thisTransform.localScale.z);
break;
case Stretch.Both:
_thisTransform.localScale = new Vector3(ratioScale, h,_thisTransform.localScale.z);
break;
default:break;
}
}
}