RPG29:制作ui基础

1.创建该类的子类

然后重启项目，再创建子类的子类

再创建一个UI用于敌人

创建一个接口

2.然后打开Warriorplayer和EnemyCharacter实现ui组件

//UIUPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category = "Combat", meta = (AllowPrivateAccess = "true"))UPlayerUIComponent* PlayerUIComponent;

PlayerUIComponent = CreateDefaultSubobject<UPlayerUIComponent>(TEXT("PlayerUIComponent"));

UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "UI")UEnemyUIComponent* EnemyUIComponent;

EnemyUIComponent = CreateDefaultSubobject<UEnemyUIComponent>("EnemyUIComponent");

3.打开PawnUIInterface

public:virtual UPawnUIComponent* GetPawnUIComponent() const = 0;

打开CHaracterBase继承此接口

//Begin IUIPawnInterface Interfacevirtual UPawnUIComponent* GetPawnUIComponent() const override;//End IUIPawnInterface Interface

UPawnUIComponent* ACharacterBase::GetPawnUIComponent() const
{return nullptr;
}

然后打开WarriorPlayer做同样的事

//Begin IUIPawnInterface Interfacevirtual UPawnUIComponent* GetPawnUIComponent() const override;//End IUIPawnInterface Interface

UPawnUIComponent* AWarriorPlayer::GetPawnUIComponent() const
{return PlayerUIComponent;
}

打开EnemyBase做同样的事

//Begin IUIPawnInterface Interfacevirtual UPawnUIComponent* GetPawnUIComponent() const override;//End IUIPawnInterface Interface

UPawnUIComponent* AEnemyBase::GetPawnUIComponent() const
{return EnemyUIComponent;
}

4.接下来对数值进行广播

打开PawnUIComponent.h,创建好委托

//当值的百分比发生变化时
DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FOnPercentChangedDelegate, float, NewPercent);UPROPERTY(BlueprintAssignable)FOnPercentChangedDelegate OnCurrentHealthChanged;

然后进入PlayerUIComponent.h，为Rage单独创建一个委托（因为这个东西是只有玩家才有，怪物没有）

UPROPERTY(BlueprintAssignable)FOnPercentChangedDelegate OnCurrentRageChanged;

然后进入PawnUiInterface.h

virtual UPlayerUIComponent* GetPlayerUIComponent() const;

UPlayerUIComponent* IPawnUIInterface::GetPlayerUIComponent() const
{return nullptr;
}

进入WarriorPlayer覆写此函数

virtual UPlayerUIComponent* GetPlayerUIComponent() const override;

UPlayerUIComponent* AWarriorPlayer::GetPlayerUIComponent() const
{return PlayerUIComponent;
}

接着，进入XMBAttributeSet,先创建一个用于存储当前Pawn对象的变量

private://用于存储当前的PawnUIInterfaceTWeakInterfacePtr<IPawnUIInterface> CachedPawnUIInterface;

然后需要在数值发生变化时，先获取到当前对象的PawnUIComponent

void UXMBAttributeSet::PostGameplayEffectExecute(const struct FGameplayEffectModCallbackData& Data)
{
//获取到目标的UIComponent，则可以用广播if (!CachedPawnUIInterface.IsValid()){CachedPawnUIInterface = TWeakInterfacePtr<IPawnUIInterface>(Data.Target.GetAvatarActor());}checkf(CachedPawnUIInterface.IsValid(), TEXT("%s didn`t implement IPawnUIInterface"),*Data.Target.GetAvatarActor()->GetActorNameOrLabel());UPawnUIComponent* PawnUIComponent = CachedPawnUIInterface->GetPawnUIComponent();checkf(PawnUIComponent,TEXT("Couldn`t extrac a PawnUiComponent from %s"),*Data.Target.GetAvatarActor()->GetActorNameOrLabel());
}

然后在生命发生变化时，

//Data.EvaluatedData.Attribute是当前被修改的属性if (Data.EvaluatedData.Attribute == GetCurrentHealthAttribute())//找到正在修改的属性{const float NewCurrentHealth = FMath::Clamp(GetCurrentHealth(),0.f, GetMaxHealth());SetCurrentHealth(NewCurrentHealth);//广播变化后的生命PawnUIComponent->OnCurrentHealthChanged.Broadcast(GetCurrentHealth()/GetMaxHealth());}

当体力发生变化时，需要现货区到玩家的UIComponent，

if (UPlayerUIComponent* PlayerUIComponent = CachedPawnUIInterface->GetPlayerUIComponent()){PlayerUIComponent->OnCurrentRageChanged.Broadcast(GetCurrentRage()/GetMaxRage());}

最后在设置当前生命后再广播一次当前生命

SetCurrentHealth(NewCurrentHealth);const FString DebugString = FString::Printf(TEXT("OldHealth : %f, damage Done :%f, NewCurrentHealth:%f"),OldHealth,DamageDone,NewCurrentHealth);//将当前生命广播出去（不管变没变化都要广播）PawnUIComponent->OnCurrentHealthChanged.Broadcast(GetCurrentHealth()/GetMaxHealth());

5.启动项目，创建一个UserWidget的C++类

然后创建两个函数

protected:virtual void NativeOnInitialized() override;UFUNCTION(BlueprintImplementableEvent, meta = (DisplayName = "On Owning Player UI Component Initialized"))void BP_OnOwningPlayerUIComponentInitialized(UPlayerUIComponent* OwningPlayerUIComponent);

void UWarriorWidgetBase::NativeOnInitialized()
{Super::NativeOnInitialized();if (IPawnUIInterface* PawnUIInterface = Cast<IPawnUIInterface>(GetOwningPlayerPawn())){if (UPlayerUIComponent* PlayerUIComponent = PawnUIInterface->GetPlayerUIComponent()){BP_OnOwningPlayerUIComponentInitialized(PlayerUIComponent);}}}

6.这一步要进行敌人widget的初始化，首先进入pawnuiinterface为敌人写一个获取uicompnent的函数

virtual UEnemyUIComponent* GetEnemyUIComponent() const;

UEnemyUIComponent* IPawnUIInterface::GetEnemyUIComponent() const
{return nullptr;
}

然后进入EnemyBase内进行覆写

virtual UEnemyUIComponent* GetEnemyUIComponent() const;

UEnemyUIComponent* AEnemyBase::GetEnemyUIComponent() const
{return EnemyUIComponent;
}

再回到WarriorWidgetBase创建两个函数

public://为敌人创建的UFUNCTION(BlueprintCallable)void InitEnemyCreatedWidget(AActor* OwningEnemyActor);
protected:
UFUNCTION(BlueprintImplementableEvent, meta = (DisplayName = "On Owning Enemy UI Component Initialized"))void BP_OnOwningEnemyUIComponentInitialized(UEnemyUIComponent* OwningEnemyUIComponent);

void UWarriorWidgetBase::InitEnemyCreatedWidget(AActor* OwningEnemyActor)
{if (IPawnUIInterface* PawnUIInterface = Cast<IPawnUIInterface>(OwningEnemyActor)){//获取Enemy的UIComponentUEnemyUIComponent* EnemyUIComponent = PawnUIInterface->GetEnemyUIComponent();checkf(EnemyUIComponent, TEXT("Failed to extrac an EnemyUIComponent from %s"),*OwningEnemyActor->GetActorNameOrLabel());BP_OnOwningEnemyUIComponentInitialized(EnemyUIComponent);}
}