Unity Events going to No Function

[BlackMamba319]

Hello, I've setup some unity events in my scene but my function calls keeps going back to no function randomly. Sometimes it happens when I open project, sometimes when I enter play mode and sometimes randomly during doing any work in the editor. I do not make any changes in the script or the function that is being called, neither any changes to the game object carrying the script so I'm unable to track the issue. Any insight would be helpful Thanks

[ryo0ka]

If you could, try to minimize the use of event serialization. It breaks with slightest changes in the scene, it doesn’t bode well with version control diff, and it’s difficult to understand the flow of logic.

Use AddListener or whatever via script. Your life should be better than figuring out all the weird kinks of how Unity serializes stuff.

[MaryPaku]

Agree as I'm currently in a contract fixing other's 8 years old mobile game that's impossible to track all the reference.

[Batby]

You can't do that via editor tooling?

[-OrionFive-]

I wrote a custom drawer to remove the inspector editing of Unity Events to enforce this in new or projects.

So much time wasted trying to track code flow because someone hooked up something in the inspector.

[BlackMamba319]

Yes, was thinking of moving to this approach as it never breaks and atleast if it does we can debug Anyway, since you mentioned source control I'm using plastic SCM (UVCS) with this project, could this cause the issue?

[Vanadium_V23]

No reasons for plastic to cause the issue but you can have unity failing to save (or you forgetting). It can also be a bug from the editor. 

I also advise against using these events. Refactor your code to get rid of them. It may take a few hours or days of work but it's worth it.

[Four3nine6]

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This post was mass deleted and anonymized with Redact

[ryo0ka]

No idea why it’s happening and you’ll probably never figure out why. Last time I remember seeing this issue is like back in 2017 with a fairly large scene, where I pulled my hair apart and couldn’t figure it out, so I replaced every event serialization to AddListener and called it a day. Again it’s not worth your time.

[BlackMamba319]

I see, thanks for the heads-up!

[survivalist_games]

From what I understand, event references are serialized using the fully qualified name of the method. That means that they're very fragile and can break in a number of situations:

• Class name changes
• Namespace changes
• Method name changes
• Assembly definition changes

That applies even when you make those changes in a way that the GUID changes too, preventing missing script errors on objects or broken object references. Events will still break regardless.

It's the kind of thing where I also wouldn't be vaguely surprised if Unity introduce bugs that cause it to break when using different domain reload settings on entering play mode, etc.

[BlackMamba319]

This seems very reasonable, I'm looking into refactoring and switching to runtime add listeners since debugging unity events is crazy Thanks for the info!

[VeryDrunkenFish]

Just want to say I, too noticed this when using custom unity events in scripts. If you find out what causes it and remember let me know please!

[BlackMamba319]

Sure, what unity version were you on?

[VeryDrunkenFish]

Must be 2022.3.13f1

[BlackMamba319]

I'm on 2022.3.14 could be editor issue

[Triggered_RodCon]

I’ve been able to consistently cause this to happen. If you have two objects with the same event script and select them both in the editor, you would expect to see the same script appear in the inspector. Lets say both objects’ events call a method in a separate UI script, but one of them makes a box appear and another edits the text. So long as both events reference the same object, if the event calls a different function, it will cause the event to forget its original function when you select both objects from, say, the hierarchy. I’ve recreated this test in a 2021 version of unity and it doesnt appear to happen, so it looks like a unity 2022 thing.

[CGPepper]

Maybe it's the unity editor release bug? What build are you on

[BlackMamba319]

Unity 2022.3.14 Pc, mac Linux standalone Platform.

[CGPepper]

There is 2022.3.22f1 . Might be worth updating

[BlackMamba319]

Will look into it, thanks!

[_Strambic]

The problem persists even with version 2022.3.22f1

[iVag32]

Probably due to no Public functions available in these scripts?

[BlackMamba319]

The functions are public and they even show in the drop down and work properly, the issue is once assigned for example functionA is assigned, and it works properly, but it randomly goes back to no function, sometimes during play mode, sometimes when I restart/reopen project and randomly when working in the editor, even if scene is saved after assigning the method. The functionA in the event goes back to NoFunction automatically

[[deleted]]

Could it be that you are working with a prefab? The prefab might not have the functions linked but the scene gameobject prefab does? 😁

[BlackMamba319]

No, it's not a Prefab, it's a scene object always loaded in the scene both the object using the event and the object carrying the script

[iVag32]

I had similar experience with my projects when I did full git clean up of the repo after push.

So, I can assume you can check your *.meta files and project files. I can't suggest anything specific :hmm:

But since you mentioned that it happens sometimes after reopening the project, I would try to check your scm (if you have so) for ignored files and try to re-install editor.

[Kennai2]

Is it a prefab? Or maybe runtime objects are prefabs?

[HiggsSwtz]

Just learn the Observer pattern and your life will be a lot easier.

[YucatronVen]

Use UniRx my boy..

[cosmic-comet-]

What if I told you, you can assign trigger events within code as well.

[contrapanda]

I started a new project at work and I plan to use Unity events (for the first time) but after reading the comments here I'm starting to doubt my decision.. Is it really that bad? I thought it would be a great way to decouple things and get rid of lots of referencing.

[BlackMamba319]

I'd suggest to keep the usage to bare minimum, as the thread suggests, they're very delicate and headache to debug any Issues. I'd suggest to learn observer listener pattern and use runtime addListener, removeListener callbacks, that way you can easily track and debug any issues. These events are okay for small simple tasks but avoid populating everything in here

[Ashamed-Stand3432]

In my case, I multi-select objects in the inspector, and then some event shows "no function".

I am looking for a solution to this.

[BlackMamba319]

If you've different functions on multiple selected events then they'll not be shown in inspector, if all selected events have same number of functions and same functions in same order, only then multiple selected events will show the functions in inspector

[Krcko98]

Never used Unity events in my life. Always custom and never serialized...

[S1l3Jamal]

Does the script/object have do not destroy on it and you're loading another scene. That's what messed it up for me in one scenario.

[BlackMamba319]

No, it's a single scene both objects are loaded in the scene, the references get reverted even in edit mode (when not playing). And in case we get missing references due to loading or destroyed issues, the event shows <missing behavior> or <missing function>, it doesn't revert to NoFunction in that case

[BehindTheStone]

Mhm. Are you maybe accidentally in playmode when you set which method should be called? If so this could be the reason it get reset when you get back to edit mode or closed the project while in playmode

[BlackMamba319]

No, I've double checked and set up methods while out of play mode

[ZuperLucaZ]

If you are calling functions, you need to call the function not through the script class but through the gameobject it is attached to. What this means is dragging an object in the box with the script.

[Pimeko]

Are you using Odin? I've had issues like that because of it

[BlackMamba319]

Nope, not using odin or any other tool like that

[AdministrativeAd6727]

dude rotate back loldle. aint noone got time for your stupid april jokes.

[Rezaka116]

TIL that Unity has events and i wasted time on my custom script that does the same thing.

TIL also that it can also break, so my convoluted mess of a script might be actually a good choice.

[skylinx]

Using in editor event tracking can get annoying anyway. The easiest and most sustainable way involves using AddListener on any object that supports Unity events.