在Unity中，如何在Inspector中更改布尔值时触发Set方法？

Question

Let's say I have the following class attached to a game object:

public class SomeClass : MonoBehaviour
{

    [SerializeField]
    private bool aBool;

    public bool ABool 
    {
        get 
        {
            return aBool;
        }
        set 
        {
            Debug.Log("we are setting the bool!");
            
            // triggered when changing from false to true
            if (aBool == false && value == true) 
            {
                // do stuff
            }

            // triggered when changing from true to false
            if (aBool == true && value == false)
            {
                // do stuff
            }

            aBool = value;
        } 
    }

    // Other fantastic methods and etc here.
}

When I play my game and check the aBool checkbox on the game object in the inspector, the set method is not being triggered. My debug log statement is not triggering, so it looks like it is not entering the set method.

How do I trigger the set method when I set the boolean in the inspector window, when playing the game? Have I done something wrong when creating the property?

Answer 1

Posting for anyone else in the same situation.

In unity, when you have a bool exposed in the inspector, which also has a property overriding the set method, it does not call the set method when the bool is set in the inspector. Instead, it is modifying the bool directly.

If you want to be able to change a bool in the inspector and detect when it is changed in a script, you will need to poll for changes in the update function.

This makes my particular use case a bit more verbose, but oh well.

Answer 2

The Inspector itself is not aware of any properties in your class. It will always only expose the serialized fields . See also Unity Script Serialization .

What you see and edit in the Inspector is not the property ABool but rather the field aBool which itself is in no way aware of that ABool exists at all.

The confusion might be caused by the Inspector automatically making all exposed fields "human readable" starting with capital letters.

---

One way that was mentioned is using OnValidate which s automatically called when a value of this component was changed via the Inspector and do eg

private void OnValidate()
{
    // Only call properties during PlayMode since they might depend on runtime stuff
    if(!Application.isPlaying) return;

    ABool = aBool;
}

---

Another way would be to implement your own field attribute like eg mentioned in OnValueChanged for fields in a Scriptable Object

Answer 3

I think anyone did not notice that OP is setting abool variable and has getter and setter on Abool variable .Obviously setter and getter will get triggered when read write happens on Abool not abool. But OP is setting abool instead of Abool. Also properties (variables with get/set methods) can not be exposed in inspector to be set by inspector by yourself. They can only be altered through code.