The code has been commented for you. Enjoy.
public Sprite sprite1; // Drag your first sprite here public Sprite sprite2; // Drag your second sprite here private SpriteRenderer spriteRenderer; void Start () { spriteRenderer = GetComponent<SpriteRenderer>(); // we are accessing the SpriteRenderer that is attached to the Gameobject if (spriteRenderer.sprite == null) // if the sprite on spriteRenderer is null then spriteRenderer.sprite = sprite1; // set the sprite to sprite1 } void Update () { if (Input.GetKeyDown (KeyCode.Space)) // If the space bar is pushed down { ChangeTheDamnSprite (); // call method to change sprite } } void ChangeTheDamnSprite () { if (spriteRenderer.sprite == sprite1) // if the spriteRenderer sprite = sprite1 then change to sprite2 { spriteRenderer.sprite = sprite2; } else { spriteRenderer.sprite = sprite1; // otherwise change it back to sprite1 } }
You need to have a sprite renderer attached to your GameObject. Create a new C# Script and attach to it a GameObject. Paste the code in between the parenthesis... I'm sure you can figure it out from there :)