ScriptReference/SortingLayer

[giscus[bot]]

ScriptReference/SortingLayer

https://docs.unity3d.com/ScriptReference/SortingLayer.html

[Chaussurre]

Unity doesn't provide any tools for selecting a sorting layer from the editor on a custom script, and as the SortingLayer struct is not serializable, it will not show on the editor.

Here's my recommended fix around:

[Serializable]
public struct SortingLayerPicker
{
    public int Id;

    public static implicit operator string(SortingLayerPicker picker)
    {
        return SortingLayer.IDToName(picker.Id);
    }

    public static implicit operator int(SortingLayerPicker picker)
    {
        return picker.Id;
    }

    public int Value => SortingLayer.GetLayerValueFromID(Id);
}

#if UNITY_EDITOR
[CustomPropertyDrawer(typeof(SortingLayerPicker))]
public class SortingLayerPickerDrawer : PropertyDrawer
{
    public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
    {
        var IdProp = property.FindPropertyRelative("Id");
        var names = SortingLayer.layers.Select(x => x.name).ToArray();
        int index = 0;
        for (int i = 0; i < SortingLayer.layers.Length; i++)
            if (IdProp.intValue == SortingLayer.layers[i].id)
            {
                index = i; 
                break;
            }


        index = EditorGUI.Popup(position, label.text, index, names);

        IdProp.intValue = SortingLayer.layers[index].id;
    }
}
#endif

Add this code on any script in your project, preferably a new one.

Now, if you want to select a sorting layer from a custom MonoBehaviour, simply add a SortingLayerPicker field visible in the inspector, and automatically the inspector will display a pop up to choose a layer from.