删除无用的asset
已经在地图中使用的asset会有asset reference
EditorAssetLibrary（按F12）open header file，会有如下一个功能，可以找asset reference，返回bool值
UFUNCTION(BlueprintCallable, Category = "Editor Scripting | Asset")static TArray<FString> FindPackageReferencersForAsset(const FString& AssetPath, bool bLoadAssetsToConfirm = false);for (const FAssetData& SelectedAssetData : SelectedAssetsData) 是一个范围循环（range-based for loop），通常在 Unreal Engine 中用于遍历一个容器中的所有元素。
: 在 for 循环中的用法是用于范围循环（range-based for loop）的语法符号。“在”或者“属于”
ObjectTools.h中的非强制删除。可以让使用者有一个确认删除的机会。
UNREALED_API int32 DeleteAssets( const TArray<FAssetData>& AssetsToDelete, bool bShowConfirmation = true );如下报错（unresolved external symbal) means we need to add module to Build.cs file
UnrealEd means Unreal Editor
PublicDependencyModuleNames.AddRange(new string[]{"Core","Blutility","EditorScriptingUtilities","UMG","Niagara","UnrealEd"// ... add other public dependencies that you statically link with here ...});示例代码
UFUNCTION(CallInEditor)void RemoveUnusedAssets();// Fill out your copyright notice in the Description page of Project Settings.#include "AssetAction/QuickAssetAction.h"
#include "DebugHeader.h"
#include "EditorUtilityLibrary.h"
#include "EditorAssetLibrary.h"
#include "ObjectTools.h" //新增void UQuickAssetAction::RemoveUnusedAssets()
{TArray<FAssetData> SelectedAssetsData = UEditorUtilityLibrary::GetSelectedAssetData();TArray<FAssetData> UnusedAssetsData;for (const FAssetData& SelectedAssetData : SelectedAssetsData) {TArray<FString> AssetReferencers =UEditorAssetLibrary::FindPackageReferencersForAsset(SelectedAssetData.ObjectPath.ToString());if (AssetReferencers.Num() == 0) {UnusedAssetsData.Add(SelectedAssetData);}//把它加入废物列表}if (UnusedAssetsData.Num() == 0) {ShowMsgDialog(EAppMsgType::Ok, TEXT("No unused asset found among selected assets"), false);return;}else {const int32 NumOfAssetsDeleted = ObjectTools::DeleteAssets(UnusedAssetsData);//执行删除ShowNotifyInfo(TEXT("Successfully deleted " + FString::FromInt(NumOfAssetsDeleted) + TEXT(" unused assets.")));}//const int32 NumOfAssetDeleted = ObjectTools::DeleteAssets(UnusedAssetsData);//执行删除//if (NumOfAssetDeleted == 0)return;//ShowNotifyInfo(TEXT("Successfully deleted " + FString::FromInt(NumOfAssetsDeleted) + TEXT(" unused assets.")));
}可读性：可以考虑将未使用资产的查找和删除逻辑分成两个独立的函数
插件效果
