ue4 修改父类组件创建类型或让父类不创建组件

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修改父类组件创建类型或让父类不创建组件：

通过AMyCharacter::AMyCharacter(const FObjectInitializer& ObjectInitializer)格式的构造函数,后面采用以下形式：

AMyCharacter::AMyCharacter(const FObjectInitializer& ObjectInitializer)

:Super(ObjectInitializer.DoNotCreateDefaultSubobject(ACharacter::CapsuleComponentName).SetDefaultSubobjectClass<UMocapSkeletalMeshComponent>(ACharacter::MeshComponentName))

{

PrimaryActorTick.bCanEverTick = true;

}

其父类为ACharacter：

ACharacter::ACharacter(const FObjectInitializer& ObjectInitializer)

: Super(ObjectInitializer)

{

.......

CharacterMovement = CreateDefaultSubobject<UCharacterMovementComponent>(ACharacter::CharacterMovementComponentName);

if (CharacterMovement)

{

CharacterMovement->UpdatedComponent = CapsuleComponent;

CrouchedEyeHeight = CharacterMovement->CrouchedHalfHeight * 0.80f;

}

Mesh = CreateOptionalDefaultSubobject<USkeletalMeshComponent>(ACharacter::MeshComponentName);

if (Mesh)

{

Mesh->AlwaysLoadOnClient = true;

Mesh->AlwaysLoadOnServer = true;

Mesh->bOwnerNoSee = false;

Mesh->VisibilityBasedAnimTickOption = EVisibilityBasedAnimTickOption::AlwaysTickPose;

Mesh->bCastDynamicShadow = true;

Mesh->bAffectDynamicIndirectLighting = true;

Mesh->PrimaryComponentTick.TickGroup = TG_PrePhysics;

Mesh->SetupAttachment(CapsuleComponent);

static FName MeshCollisionProfileName(TEXT("CharacterMesh"));

Mesh->SetCollisionProfileName(MeshCollisionProfileName);

Mesh->SetGenerateOverlapEvents(false);

Mesh->SetCanEverAffectNavigation(false);

}

ObjectInitializer.DoNotCreateDefaultSubobject 对父类构造函数中CreateOptionalDefaultSubobject起着作用，这个函数会根据ObjectInitializer是否设置了DoNotCreateDefaultSubobject决定是否创建给定名称的子对象，如果设置了，则CreateOptionalDefaultSubobject 返回null，ObjectInitializer.DoNotCreateDefaultSubobject 对CreateDefaultSubobject中不起作用

ObjectInitializer.SetDefaultSubobjectClass 决定了CreateDefaultSubobject和CreateOptionalDefaultSubobject创建指定子对象时，覆盖其指定的子对象的创建类型，当然覆盖的类型必须是指定的类型子类型。如果父类的构造函数已经为父类的父类设置过SetDefaultSubobjectClass，则当前SetDefaultSubobjectClass设置的类必须是父类设置的SetDefaultSubobjectClass类的子类。