Manual/UIE-LoadingUXMLcsharp

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Manual/UIE-LoadingUXMLcsharp

https://docs.unity3d.com/Manual/UIE-LoadingUXMLcsharp.html

[TermWay]

A template for an EditorWindow using Unity Toolkit with the TemplateContainer:

if UNITY_EDITOR
using UnityEditor;
using UnityEngine;
using UnityEngine.UIElements;

public class CustomWindow : EditorWindow
{
    [SerializeField] VisualTreeAsset uxml;
    [SerializeField] StyleSheet uss;

    [MenuItem("Tools/" + nameof(CustomWindow))]
    public static void ShowWindow()
    {
        GetWindow<CustomWindow>(nameof(CustomWindow));
    }

    void CreateGUI()
    {
        TemplateContainer templateContainer =  uxml.Instantiate();
        templateContainer.styleSheets.Add(uss);
        rootVisualElement.Add(templateContainer);
    }
}

Without the template container:

if UNITY_EDITOR
using UnityEditor;
using UnityEngine;
using UnityEngine.UIElements;

public class CustomWindow : EditorWindow
{
    [SerializeField] VisualTreeAsset uxml;
    [SerializeField] StyleSheet uss;

    [MenuItem("Tools/" + nameof(CustomWindow))]
    public static void ShowWindow()
    {
        GetWindow<CustomWindow>(nameof(CustomWindow));
    }

    void CreateGUI()
    {
        uxml.CloneTree(rootVisualElement);
        rootVisualElement.styleSheets.Add(uss);
    }
}