Enable/Disable Systems Programmatically in 1.0

Unity Engine
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1

Couldn’t find anything around this for 1.0. What’s the best way to enable/disable systems programmatically?

2

I think I figured it out:

World.Systems[0].enabled = false;

Just need to iterate over the systems to find the one you want.

3

You likely want something like this:
World.GetExistingSystemManaged().Enabled = false;

4

Nice. That’s actually better. How about unmanaged systems (systems that inherit from ISystem)? Can’t find a way to enable/disable them.

5

Thats the way id do it:

var systemHandle = World.GetExistingSystem<MyUnmanagedSys>();
var unmanagedSystem = World.Unmanaged.GetUnsafeSystemRef<MyUnmanagedSys>(systemHandle);
unmanagedSystem.Enabled = false;

Maybe there is a better way idk.

I don’t know your use case but you should also consider
RequireForUpdate(entityQuery) as an option. Thats usually what i go with.

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6

That’s perfect. Thanks. I have used RequireForUpdate before. My use case is more so for some custom debugging purposes. Not anything to be used for production so doesn’t need to be fancy.

7

Hmm, just tried it and “Enabled” does not exist on “ISystem”.

8

Example of unmanaged systems in a context I actually use: Latios-Framework/Core/Framework/CoreBootstrap.cs at v0.6.4 · Dreaming381/Latios-Framework · GitHub

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9

I also just found that you can use “GetExistingSystemState”:

World.Unmanaged.GetExistingSystemState<MyUnmanagedSys>().Enabled = false;
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10

Is this for 1.0? I use Entities 1.0.0-pre 15. this API is not valid for me.

11

It is. I am using 1.0.0-pre.15 as well. What error are you seeing? Note that this API is for unmanaged systems (systems that inherit from ISystem). If your system is managed (inherits from SystemBase) then use this API:

world.GetExistingSystemManaged<MyManagedSystem>().Enabled = enabled
12

I could use it as;

var systemHandle = World.DefaultGameObjectInjectionWorld.GetExistingSystem<ChildMoveSystem>();

How can I get unmanaged system and access it’s custom fields? World.DefaultGameObjectInjectionWorld.GetExistingSystem() returns SystemHandle. I want to access my system ChildMoveSystem.

13

If your ChildMoveSystem is unmanaged system

var handle = World.DefaultGameObjectInjectionWorld.GetExistingSystem<T>();
var systemReference = World.DefaultGameObjectInjectionWorld.Unmanaged.GetUnsafeSystemRef<T>(handle);

If your system is managed

var systemReference = World.DefaultGameObjectInjectionWorld.GetExistingSystemManaged<T>();
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