UE4 C++ HUD to add an array of widgets to the Viewport on BeginPlay - (Dont forget to add "UMG" to your project.Build.cs's PublicDependencyModuleNames property)

AWidgetHUD.cpp

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

AWidgetHUD::AWidgetHUD()
{
}

void AWidgetHUD::BeginPlay()
{
	Super::BeginPlay();

	// If any widgets need to be added
	if (AllUIWidgets.Num() > 0)
	{
		// Iterate through all widgets
		for (TSubclassOf<UUserWidget> widget : AllUIWidgets)
		{
			// Create an instance of the widget and add to viewport
			UUserWidget* createdWidget = CreateWidget<UUserWidget>(GetWorld(), widget);
			createdWidget->AddToViewport();

			// Store instanced widget in array
			m_createdWidgets.Add(createdWidget);
		}
	}
}

void AWidgetHUD::DrawHUD()
{
	Super::DrawHUD();

}

AWidgetHUD.h

#pragma once
#include "CoreMinimal.h"
#include "GameFramework/HUD.h"
#include "AWidgetHUD.generated.h"

/**
 * HUD to add any widgets set in the inherited blueprint to the HUD on BeginPlay
 */
UCLASS()
class QUINNSESCAPE_API AWidgetHUD : public AHUD
{
	GENERATED_BODY()
	
public:
	AWidgetHUD();

	/*
	*	 VARIABLES
	*/
protected:
	// All on screen widgets to add to the HUD on BeginPlay
	UPROPERTY(EditAnywhere)
	TArray<TSubclassOf<class UUserWidget>> AllUIWidgets;

private:
	// Current list of created UI widgets that are constantly active on screen
	TArray<class UUserWidget*> m_createdWidgets;

	/*
	*	 METHODS
	*/
protected:
	virtual void BeginPlay() override;
	virtual void DrawHUD() override;

};