UMG 用户界面c++

docs.unrealengine.com/5.0/zh-CN/q…

继承自HowRoUMGGameModeBase

继承自HowTo_UMGPlayerController

HowRoUMG.Build.cs
添加："UMG" 取消PrivateDependencyModuleNames.AddRange(new string[] { "Slate", "SlateCore" });注释

// Copyright Epic Games, Inc. All Rights Reserved.

using UnrealBuildTool;

public class HowRoUMG : ModuleRules
{
	public HowRoUMG(ReadOnlyTargetRules Target) : base(Target)
	{
		PCHUsage = PCHUsageMode.UseExplicitOrSharedPCHs;
	
		PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine", "InputCore" ,"UMG" });

		//PrivateDependencyModuleNames.AddRange(new string[] {  });

		// Uncomment if you are using Slate UI
		 PrivateDependencyModuleNames.AddRange(new string[] { "Slate", "SlateCore" });
		
		// Uncomment if you are using online features
		// PrivateDependencyModuleNames.Add("OnlineSubsystem");

		// To include OnlineSubsystemSteam, add it to the plugins section in your uproject file with the Enabled attribute set to true
	}
}

HowRoUMGGameModeBase.h

// Copyright Epic Games, Inc. All Rights Reserved.

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/GameModeBase.h"
#include "Blueprint/UserWidget.h"
#include "HowRoUMGGameModeBase.generated.h"

/**
 * 
 */
UCLASS()
class HOWROUMG_API AHowRoUMGGameModeBase : public AGameModeBase
{
	GENERATED_BODY()

public:
    /** 移除当前菜单控件，并在指定类（如有）中新建控件。*/
    UFUNCTION(BlueprintCallable, Category = "UMG Game")
   void ChangeMenuWidget(TSubclassOf<UUserWidget> NewWidgetClass);

protected:
    /** 游戏开始时调用。*/
    virtual void BeginPlay() override;

    /** 游戏开始时，用作菜单的控件类。*/
    UPROPERTY(EditAnywhere, BlueprintReadOnly, Category = "UMG Game")
    TSubclassOf<UUserWidget> StartingWidgetClass;

    /** 用作菜单的控件实例。*/
    UPROPERTY()
    UUserWidget* CurrentWidget;
	
};

HowRoUMGGameModeBase.cpp

// Copyright Epic Games, Inc. All Rights Reserved.


#include "HowRoUMGGameModeBase.h"



void AHowRoUMGGameModeBase::BeginPlay()
{
    Super::BeginPlay();
    ChangeMenuWidget(StartingWidgetClass);
}

void AHowRoUMGGameModeBase::ChangeMenuWidget(TSubclassOf<UUserWidget> NewWidgetClass)
{
    if (CurrentWidget != nullptr)
    {
        CurrentWidget->RemoveFromViewport();
        CurrentWidget = nullptr;
    }
    if (NewWidgetClass != nullptr)
    {
        CurrentWidget = CreateWidget<UUserWidget>(GetWorld(), NewWidgetClass);
        if (CurrentWidget != nullptr)
        {
            CurrentWidget->AddToViewport();
        }
    }
}

HowTo_UMGPlayerController.cpp

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

#pragma once

#include "CoreMinimal.h"
#include "GameFramework/PlayerController.h"
#include "HowTo_UMGPlayerController.generated.h"

/**
 * 
 */
UCLASS()
class HOWROUMG_API AHowTo_UMGPlayerController : public APlayerController
{
	GENERATED_BODY()
	
public:
	virtual void BeginPlay() override;


};

HowTo_UMGPlayerController.h

#include "HowTo_UMGPlayerController.h"

void AHowTo_UMGPlayerController::BeginPlay()
{
    Super::BeginPlay();
    SetInputMode(FInputModeGameAndUI());  //FInputModeGameAndUI 是一种用来设置输入模式的数据结构，允许UI与用户输入交互
}