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See the documentation for GetComponentsInChildren:

public Component[] GetComponentsInChildren(Type type, bool includeInactive = false);

This states you can use the boolean includeInactive in GetComponentsInChildren to also get the inactive components. This way you can grab all the transforms. Even inactive ones. So you would probably want to do this:

//Create an array of SpriteRenderers
SpriteRenderer[] _spriteRenderers;
void Start ()
{
  _spriteRenderers = transform.GetComponentsInChildren(SpriteRenderer,true); //This returns an Array
   //Change the material on all the Sprite Renderers.
   for (int i = 0; i < _spriteRenderers.Length; i++)
   {
     _spriteRenderers[i].material = ...;
   }
}

See the documentation for GetComponentsInChildren:

public Component[] GetComponentsInChildren(Type type, bool includeInactive = false);

This states you can use the boolean includeInactive in GetComponentsInChildren to also get the inactive components. This way you can grab all the transforms. Even inactive ones. So you would probably want to do this:

//Create an array of SpriteRenderers
SpriteRenderer[] _spriteRenderers;
void Start ()
{
  _spriteRenderers = transform.GetComponentsInChildren<SpriteRenderer>(true); //This returns an Array
   //Change the material on all the Sprite Renderers.
   for (int i = 0; i < _spriteRenderers.Length; i++)
   {
     _spriteRenderers[i].material = ...;
   }
}

See the documentation for GetComponentsInChildren:

public Component[] GetComponentsInChildren(Type type, bool includeInactive = false);

This states you can use the boolean includeInactive in GetComponentsInChildren to also get the inactive components. This way you can grab all the transforms. Even inactive ones.

See the documentation for GetComponentsInChildren:

public Component[] GetComponentsInChildren(Type type, bool includeInactive = false);

This states you can use the boolean includeInactive in GetComponentsInChildren to also get the inactive components. This way you can grab all the transforms. Even inactive ones. So you would probably want to do this:

//Create an array of SpriteRenderers
SpriteRenderer[] _spriteRenderers;
void Start ()
{
  _spriteRenderers = transform.GetComponentsInChildren(SpriteRenderer,true); //This returns an Array
   //Change the material on all the Sprite Renderers.
   for (int i = 0; i < _spriteRenderers.Length; i++)
   {
     _spriteRenderers[i].material = ...;
   }
}

I suggest you take a look at this thread on the Unity Forum.

http://forum.unity3d.com/threads/get-all-the-childs-in-transform-even-if-the-childs-are-inactive.99452/#post-650888

Hope it helps.

EDIT: Little bit of background info.

http://docs.unity3d.com/ScriptReference/GameObject.GetComponentsInChildren.html

This states you can use the boolean includeInactive behind GetComponentsInChildren to also get the inactive components. This way you can grab all the transforms. Even inactive ones.

See the documentation for GetComponentsInChildren:

public Component[] GetComponentsInChildren(Type type, bool includeInactive = false);

This states you can use the boolean includeInactive in GetComponentsInChildren to also get the inactive components. This way you can grab all the transforms. Even inactive ones.