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RPG66.制作死亡画面(二):实现按钮逻辑

news 2025/7/26 10:14:28

1.在玩家死亡后，面板里将会有“重来”的选项。计划用这个按钮打开新的level。但是考虑到将来需要在许多不同的地图内选择“重来”，这时候我们需要选择的关卡就不能是一个固定的值，我们需要在一个地方可以选择这一个值。

“游戏实例(GameInstance)是一个很好的地方，它的生命周期与启动游戏后游戏的生命周期相同。

创建一个gameinstance的c++类

创建完后，我们需要在函数库里写获取当前level实例的方法

打开xmbwarriorlibrary

//访问游戏实例UFUNCTION(BlueprintPure, Category = "XMBWorrior|FunctionLibrary",meta = (WorldContext  = "WorldContextObject"))static UXMBGameInstance* GetXMBGameInstance(const UObject* WorldContextObject);

UXMBGameInstance* UXMBWarriorFunctionLibrary::GetXMBGameInstance(const UObject* WorldContextObject)
{if (GEngine){if (UWorld* World = GEngine->GetWorldFromContextObject(WorldContextObject,EGetWorldErrorMode::LogAndReturnNull)){return World->GetGameInstance<UXMBGameInstance>();}}return nullptr;
}

启动项目，创建刚刚创建的游戏实例的子类蓝图

然后在项目设置里搜索gameinstance

2。回到游戏实例的代码

// Fill out your copyright notice in the Description page of Project Settings.#pragma once#include "CoreMinimal.h"
#include "GameplayTagContainer.h"
#include "Engine/GameInstance.h"
#include "XMBGameInstance.generated.h"//
USTRUCT(Blueprintable)
struct FXMBGameLevelSet
{GENERATED_BODY()//关卡标签UPROPERTY(EditDefaultsOnly,meta = (Categories = "GameData.Level"))FGameplayTag LevelTag;//关卡引用UPROPERTY(EditDefaultsOnly)TSoftObjectPtr<UWorld> Level;//判断tag是否有效bool IsValid() const{return LevelTag.IsValid() && !Level.IsNull();}};/*** */
UCLASS()
class ARPG_GRIVITY_API UXMBGameInstance : public UGameInstance
{GENERATED_BODY()public://通过标签获取关卡UFUNCTION(BlueprintPure, meta = (gameplaytagfilter = "GameData.Level"))TSoftObjectPtr<UWorld> GetGameLevelByTag(FGameplayTag InTag) const;protected://在引擎中为其分配有效的关卡信息UPROPERTY(EditDefaultsOnly,BlueprintReadOnly)TArray<FXMBGameLevelSet> GameLevelSets;};

// Fill out your copyright notice in the Description page of Project Settings.#include "GameInstance/XMBGameInstance.h"TSoftObjectPtr<UWorld> UXMBGameInstance::GetGameLevelByTag(FGameplayTag InTag) const
{//通过循环从数组内查找当前的关卡for (const FXMBGameLevelSet& GameLevelSet : GameLevelSets){if (!GameLevelSet.IsValid()) continue;if (GameLevelSet.LevelTag == InTag){return GameLevelSet.Level;}}return TSoftObjectPtr<UWorld>();}

再创建两个tag

/* Game Data tags */ARPG_GRIVITY_API UE_DECLARE_GAMEPLAY_TAG_EXTERN(GameData_Level_SurvialGameModeMap);ARPG_GRIVITY_API UE_DECLARE_GAMEPLAY_TAG_EXTERN(GameData_Level_MainMenuMap);

/* Game Data tags */UE_DEFINE_GAMEPLAY_TAG(GameData_Level_SurvialGameModeMap, "GameData.Level.SurvialGameModeMap");UE_DEFINE_GAMEPLAY_TAG(GameData_Level_MainMenuMap, "GameData.Level.MainMenuMap");

打开WarriorEnumTypes，我们需要创建一个枚举用来设置玩家的输入状态

UENUM(BlueprintType)
enum class EXMBInputMode : uint8
{GameOnly,UIOnly
};

打开library

//重启后设置玩家的inputmodeUFUNCTION(BlueprintCallable, Category = "XMBWorrior|FunctionLibrary",meta = (WorldContext  = "WorldContextObject"))static void ToggleInputMode(EXMBInputMode InInputMode,const UObject* WorldContextObject);

void UXMBWarriorFunctionLibrary::ToggleInputMode(EXMBInputMode InInputMode, const UObject* WorldContextObject)
{APlayerController* PlayerController = nullptr;if (GEngine){if (UWorld* World = GEngine->GetWorldFromContextObject(WorldContextObject,EGetWorldErrorMode::LogAndReturnNull)){//获取玩家控制器PlayerController = World->GetFirstPlayerController();}}if (!PlayerController){return;;}//设置输入模式FInputModeGameOnly GameOnlyMode;FInputModeGameOnly UIOnlyMode;switch (InInputMode){case EXMBInputMode::GameOnly:PlayerController->SetInputMode(GameOnlyMode);PlayerController->bShowMouseCursor = false;break;case EXMBInputMode::UIOnly:PlayerController->SetInputMode(UIOnlyMode);PlayerController->bShowMouseCursor = true;break;default:break;}}

启动项目，进入losescreen设置