UnityAction Vs UnityEvent

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I have been using Unity for a while now and I recently stumbled on these two. From what I understand UnityAction performs the same way as an event in traditional C#. They can add functions to themselves and run them when called like Events in traditional C#. I looked into the documentation of UnityAction here: https://docs.unity3d.com/ScriptReference/Events.UnityAction.html However, then what does UnityEvent do? Unity Event also makes methods run using the AddListener. So what's the difference? Thanks in Advance.

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Answer by Hellium · Jan 31, 2019 at 09:15 AM

The definition of UnityAction is the following:

 public delegate void UnityAction();

As you can see, it's a simple delegate with no argument, and returning void.

A UnityEvent is just another way to handle events with the (great) possibility to be serialized so as to be used in the Editor (Inspector) in contrary to plain C# events. A simple example is the onClick event of a Button.

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Jako2411 · Jan 31, 2019 at 09:20 AM 0

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Don't the events need some sort of delegate type to be initialized? Like so:

 public delegate void UnBlock();
 public static event UnBlock UnBlockInitialised;

Don't UnityEvents need that?

Hellium Jako2411 · Jan 31, 2019 at 09:32 AM 0

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No, because UnityEvents are not handled the same ways as plain C# events. Internally, UnityEvents is "just" a class handling an array of UnityAction.

UnityAction Vs UnityEvent

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