Initial commit

Assets/Plugins/IconsCreator/Scripts/Editor/Utility/Helpers/LayersHelper.cs

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+using UnityEditor;
+using UnityEngine;
+
+namespace IconsCreationTool.Editor.Utility.Helpers
+{
+    internal static class LayersHelper
+    {
+        /// <summary>
+        /// Create a layer at the next available index. Returns silently if layer already exists.
+        /// </summary>
+        /// <param name="newLayerName">Name of the layer to create</param>
+        public static void CreateLayer(string newLayerName)
+        {
+            if (string.IsNullOrEmpty(newLayerName))
+            {
+                throw new System.ArgumentNullException(nameof(newLayerName),
+                    "New layer name string is either null or empty.");
+            }
+
+            const int builtInLayersCount = 5;
+
+            SerializedObject tagManager =
+                new SerializedObject(AssetDatabase.LoadAllAssetsAtPath("ProjectSettings/TagManager.asset")[0]);
+            SerializedProperty layersProperty = tagManager.FindProperty("layers");
+            int layersCount = layersProperty.arraySize;
+
+            SerializedProperty firstEmptyLayerProperty = null;
+
+            for (int i = 0; i < layersCount; i++)
+            {
+                SerializedProperty layerProperty = layersProperty.GetArrayElementAtIndex(i);
+
+                string layerName = layerProperty.stringValue;
+
+                if (layerName == newLayerName)
+                {
+                    return;
+                }
+
+                if (i < builtInLayersCount || layerName != string.Empty)
+                {
+                    continue;
+                }
+
+                firstEmptyLayerProperty ??= layerProperty;
+            }
+
+            if (firstEmptyLayerProperty == null)
+            {
+                Debug.LogError("Maximum limit of " + layersCount + " layers exceeded. Layer \"" + newLayerName + "\" not created.");
+                return;
+            }
+
+            firstEmptyLayerProperty.stringValue = newLayerName;
+            tagManager.ApplyModifiedProperties();
+        }
+
+
+        public static void RemoveLayer(string existingLayerName)
+        {
+            if (string.IsNullOrEmpty(existingLayerName))
+            {
+                throw new System.ArgumentNullException(nameof(existingLayerName),
+                    "Layer name string is either null or empty.");
+            }
+
+            const int builtInLayersCount = 5;
+
+            SerializedObject tagManager =
+                new SerializedObject(AssetDatabase.LoadAllAssetsAtPath("ProjectSettings/TagManager.asset")[0]);
+            SerializedProperty layersProperty = tagManager.FindProperty("layers");
+            int layersCount = layersProperty.arraySize;
+
+            SerializedProperty existingLayerProperty = null;
+
+            for (int i = 0; i < layersCount; i++)
+            {
+                SerializedProperty layerProperty = layersProperty.GetArrayElementAtIndex(i);
+
+                string layerName = layerProperty.stringValue;
+
+                bool validLayer = i < builtInLayersCount || layerName != string.Empty;
+                if (!validLayer)
+                {
+                    continue;
+                }
+
+                if (layerName != existingLayerName)
+                {
+                    continue;
+                }
+                
+                existingLayerProperty ??= layerProperty;
+            }
+
+            if (existingLayerProperty == null)
+            {
+                Debug.LogError($"Layer named \"{existingLayerName}\" was not found!");
+                return;
+            }
+
+            existingLayerProperty.stringValue = string.Empty;
+            tagManager.ApplyModifiedProperties();
+        }
+    }
+}

Assets/Plugins/IconsCreator/Scripts/Editor/Utility/Helpers/LayersHelper.cs.meta

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+fileFormatVersion: 2
+guid: 836ab8032815695489738920b838a6da
+timeCreated: 1674134797