UE4中实例化游戏对象的方法

1.Components:
UMeshComponent* meshComponent = CreateDefaultSubobject<UMeshComponent>("MeshComponent");（组件的创建一般在构造中完成）

2.UObjects:
UElementStructure* structure = NewObject<UElementStructure>(GetTransientPackage(), UElementStructure::StaticClass());

3.AActor:
GetWorld()->SpawnActor<AActor>(AActor::StaticClass())

4.Blueprint:
UClass* elementClass = LoadClass<ABlueprintClass>(NULL, TEXT("Blueprint'/Game/BluePrint/BP_Name.BP_Name_C'"));
if (elementClass == nullptr) {
return;
}
else
{
GetWorld()->SpawnActor<ABlueprintClass>(elementClass);
}