Our Unity guru, Harald, will be along tomorrow, but check this part of the docs (scroll down a little to where it says C#):
spine-unity Runtime Documentation: Life cycle
The code snippet you found for Combining Skins omits this boilerplate:
public class YourComponent : MonoBehaviour {
SkeletonAnimation skeletonAnimation;
Skeleton skeleton;
void Awake () {
skeletonAnimation = GetComponent<SkeletonAnimation>();
skeleton = skeletonAnimation.Skeleton;
}
}
That's likely the part you are missing: you need to add two fields to your class and set them in Awake(), then you can use them in your other methods.
The GetComponent call is Unity API to get a component on the Unity GameObject, so you'll need to be sure you have a SkeletonAnimation on the GameObject you have attached your behavior (script) to.
Hopefully I did not butcher the (weird) Unity terminology. 🙂
