U++ 创建UI

.h：

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/HUD.h"
#include "MyHUD.generated.h"

/**
 * 
 */
UCLASS()
class FLOATINGCUBE_API AMyHUD : public AHUD
{
	GENERATED_BODY()

	public:
		virtual void BeginPlay() override;
		AMyHUD();

		UPROPERTY(EditAnywhere, BlueprintReadWrite)
			TSubclassOf<UUserWidget> userWidget;
		
		UPROPERTY()
			UUserWidget* refWidget;
};

.cpp：

// Fill out your copyright notice in the Description page of Project Settings.


#include "MyHUD.h"
#include "Blueprint/UserWidget.h"

AMyHUD::AMyHUD() {
	
}

void AMyHUD::BeginPlay() {
	refWidget = CreateWidget<UUserWidget>(GetWorld(), userWidget);
	if (refWidget != nullptr) {
		refWidget->AddToViewport();
	}
}