第一种: 如果该蓝图有C++类(或者说是从C++类创建的蓝图)

ATemp* spawnActor = GetWorld()->SpawnActor(ATemp::StaticClass());

所有的加载资源并创建到场景中的方式都离不开SpawnActor这一句代码.如果你的蓝图包含了C++类,那么可以直接访问类的StaticClass

第二种: 通过ConstructorHelpers来加载(只能在类的构造函数中使用)

static ConstructorHelpers::FClassFinder bpClass(TEXT("/Game/BluePrint/TestObj"));if(bpClass.Class != NULL){GetWorld()->SpawnActor(bpClass.Class);}

FClassFinder是一个结构体,其中的Class成员变量是TSubClassof类型的.所以我们只需要SpawnActor(bpClass.Class)就可以生成我们要的东西了 该方法在一开头的地方就先检查了是否在构造函数中CheckIfIsInConstructor,另外一点,该变量必须是static的

struct FClassFinder{TSubclassOf Class;FClassFinder(const TCHAR* ClassToFind){CheckIfIsInConstructor(ClassToFind);FString PathName(ClassToFind);StripObjectClass(PathName, true);Class = ConstructorHelpersInternal::FindOrLoadClass(PathName, T::StaticClass());ValidateObject(*Class, PathName, *PathName);}bool Succeeded(){return !!*Class;}};

第三种: 通过FStringAssetReference来加载

FStringAssetReference asset = "Blueprint'/Game/BluePrint/TestObj.TestObj'";UObject* itemObj = asset.ResolveObject();UBlueprint* gen = Cast
    
     (itemObj);if (gen != NULL){AActor* spawnActor = GetWorld()->SpawnActor
     
      (gen->GeneratedClass);}
     
    

FStringAssetReference类的作用主要是通过一个字符串,找到该字符串所对应的资源.或者通过给定的资源,找到该资源所对应的在项目中的路径,也就是前面所说的字符串 其中,asset.ResolveObject就是查找字符串对应的资源,返回一个UObejct,我们通过将其转化成UBlueprint类型然后再取的他的GenerateClass即可

第四种:  通过StaticLoadObject来加载

UObject* loadObj = StaticLoadObject(UBlueprint::StaticClass(), NULL, TEXT("Blueprint'/Game/BluePrint/TestObj.TestObj'"));if (loadObj != nullptr){UBlueprint* ubp = Cast(loadObj);AActor* spawnActor = GetWorld()->SpawnActor(ubp->GeneratedClass);UE_LOG(LogClass, Log, TEXT("Success"));}

✔动态加载资源：Material跟Texture(材质和贴图)

示例1：

动态加载的工具方法

UTexture2D* MyTextureLoader::LoadTextureFromPath(const FString& Path) {     if (Path.IsEmpty()) return NULL;      return Cast
    
     (StaticLoadObject(UTexture2D::StaticClass(), NULL, *(Path))); }
    

调用：

FString PathToLoad = "/Game/Textures/YourStructureHere"; UTexture2D* tmpTexture = LoadTextureFromPath(PathToLoad);

示例2：

struct FConstructorStatics {     ConstructorHelpers::FObjectFinderOptional
    
      TextureFinder;     ConstructorHelpers::FObjectFinderOptional
     
       MaterialFinder;     FConstructorStatics()         : TextureFinder(TEXT("Texture2D'/Game/Textures/2DBackground.2DBackground'"))         , MaterialFinder(TEXT("Material'/Game/Materials/DynamicTextureMaterial.DynamicTextureMaterial'"))     {     } }; static FConstructorStatics ConstructorStatics;  Texture = ConstructorStatics.TextureFinder.Get(); UMaterial* Material = ConstructorStatics.MaterialFinder.Get(); DynamicMaterial = UMaterialInstanceDynamic::Create(Material, this);
     
    

设置调用加载好的Material和Texture：

DynamicMaterial->SetTextureParameterValue(FName("DynamicTexture"), Texture);Mesh->SetMaterial(0, DynamicMaterial);

如果资源永不再使用，想销毁资源对象，代码如下：

Texture2D* mytex; //这里假设mytex合法有效mytex->ConditionalBeginDestroy();mytex = NULL;GetWorld()->ForceGarbageCollection(true);