change sprite of gameobject code example

Example 1: load an image sprite script unity

void Start()
    {
        spriteArray = Resources.LoadAll<Sprite>("BirdHeroSprite");
    }

Example 2: change sprite of a sprite unity

public SpriteRenderer spriteRenderer;
public Sprite newSprite;

void ChangeSprite()
    {
        spriteRenderer.sprite = newSprite; 
    }