Class for spawning units (gameobjects)

Questions & Answers
1

Hey guys,
I am not sure if someone asked before about this but I didnt find it so…

We are creating a TD game with my classmate and I dont really know how to make several types of units ( with different hp, gold reward, special abilities, …). I created spawning system with certain amount of units and interval of spawning plus prefab of gameobject in one script and its all working. But the thing is I cant figure it out how to create class of units where will be every attribute that i can later connect to prefabs of every unit and connect it to spawning system as well.
I mean like tower shoot and hit one gameobject and the hp of the unit will decrease.

So if you get it please help me. :slight_smile:

Best regards,
MonK

2

Hi MonKcz

If I understand what you’re saying, you want to register new units with scripts that are responsible for interacting with them. So for example, a Tower needs to be aware of it’s targets even though they may not be immediately related.

This is a tricky subject, and there are a couple ways of solve it. My personal approach so far has been to use a singleton, but singletons are a fairly polarizing subject among programmers so don’t be surprised if I get criticised for this post.

Firstly, the wiki singleton implementation:
http://wiki.unity3d.com/index.php/Singleton

Using this Singleton MonoBehaviour I would make a Singleton UnitSpawner:

public class UnitSpawner : Singleton<UnitSpawner>
{
}

Now, from here any of your scripts will be able to access the UnitSpawner by using UnitSpawner.Instance.

You could have a property that stores all of the instantiated units so all of the towers have a quick reference to the units.

I would suggest playing with this and seeing what you can do. It’s a fairly inelegant solution, but it should get you back on your feet for a bit.