AssetImporterEditor.Apply

Description

Saves any changes from the Editor's control into the asset's import settings object.

Can be overridden as required. Gets called when changes to settings are being applied.

using UnityEngine;
using UnityEditor;
using UnityEditor.Experimental.AssetImporters;

public class ExampleScript : AssetImporterEditor
{
    public void OnInspectorGUI()
    {
        // Add custom gui controls here...

        ApplyRevertGUI();
    }

    protected override bool OnApplyRevertGUI()
    {
        using (new EditorGUI.DisabledScope(!HasModified()))
        {
            bool applied;
            using (new EditorGUI.DisabledScope(!HasModified()))
            {
                RevertButton();
                applied = ApplyButton("Apply X");
            }

            bool upgrade = upgradeMaterials;
            GUIContent genButtonText = HasModified() || upgrade ? Styles.ApplyAndGenerate : Styles.Regenerate;

            if (GUILayout.Button(genButtonText))
            {
                bool hasModified = HasModified();

                // Apply the changes and generate the materials before importing so that asset previews are up-to-date.
                if (hasModified)
                    Apply();

                if (upgrade)
                {
                    foreach (var importer in importers)
                        importer.SetMaterialVersionToCurrent();
                }

                GenerateMaterials();

                if (hasModified || upgrade)
                {
                    ApplyAndImport();
                    applied = true;
                }
            }
            return applied;
        }
    }
}