UE4 C++ 构造函数，在Spawn时被调用

ACharacterBase(const FObjectInitializer& ObjectInitializer = FObjectInitializer::Get());

ACharacterBase::ACharacterBase(const FObjectInitializer& ObjectInitializer)
: Super(ObjectInitializer)
{
PrimaryActorTick.bCanEverTick = true;
......
}