同步系列9-下蹲的动画和同步

老样子先看输入

	//按下Ctrl下蹲
	EnhancedInputComponent->BindAction(IA_CrouchPressed, ETriggerEvent::Triggered, this, &ABlasterCharacter::CrouchButtonPressed);
void ABlasterCharacter::CrouchButtonPressed(const FInputActionValue& InputValue)
{
	if(bIsCrouched)
	{
		UnCrouch();
	}
	else
	{
		Crouch();
	}
}

UnCrouch和Crouch都是虚幻已经写好的函数，角色类直接用就行，具体实现可以点进去看。bIsCrouched变量是Character.h基类里的，其值会在UnCrouch和Crouch中修改，声明如下。

/** Set by character movement to specify that this Character is currently crouched. */
UPROPERTY(BlueprintReadOnly, replicatedUsing=OnRep_IsCrouched, Category=Character)
uint32 bIsCrouched:1;

可以看出这个变量是属性复制的，其对应的回调OnRep_IsCrouched实现如下，

void ACharacter::OnRep_IsCrouched()
{
	if (CharacterMovement)
	{
		if (bIsCrouched)
		{
			CharacterMovement->bWantsToCrouch = true;
			CharacterMovement->Crouch(true);
		}
		else
		{
			CharacterMovement->bWantsToCrouch = false;
			CharacterMovement->UnCrouch(true);
		}
		CharacterMovement->bNetworkUpdateReceived = true;
	}
}

可以看出，角色蹲起与否的网络同步已经被实现了。

最后在动画蓝图中添加是否蹲伏的变量。

UPROPERTY(BlueprintReadOnly, Category = Anim, meta = (AllowPrivateAccess = "true"))
	bool bIsCrouched;
void UBlasterAnimInstance::NativeUpdateAnimation(float DeltaTime)
{
	Super::NativeUpdateAnimation(DeltaTime);
	//无关的逻辑

    //设置动画蓝图中bIsCrouched变量的值，从玩家角色中获取
	bIsCrouched = BlasterCharacter->bIsCrouched;
}

最后进入动画蓝图，修改过渡条件，即可完成功能

最后看一下效果