RPG7.准备GAS的工作

1.启动项目，为项目添加gameplayability插件

2.添加abilitysystemcomponent的c++类

3.添加attributeset的c++类

4.往build.cs内添加模块

5.进入CharacterBase内，添加gameplayasystem和attributbeset，覆写PossessedBy()和GetAbilitysystemcomponent()

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class ARPG_GRIVITY_API ACharacterBase : public ACharacter, public IAbilitySystemInterface
{
	GENERATED_BODY()

public:
	ACharacterBase();

	//创建能力组件的获取方法
	UXMBAbilitySystemComponent* GetXMBAbilitySystemComponent() const {return  XMBAbilitySystemComponent;}
	
	//创建属性集的获取方法
	UXMBAttributeSet* GetXMBAttributeSet() const {return  XMBAttributeSet;}

	//Begin IAbilitySystemInterface Interface
	virtual UAbilitySystemComponent* GetAbilitySystemComponent() const override;
	//End IAbilitySystemInterface Interface

	
protected:
	//创建能力组件
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "AbilitySystem")
	UXMBAbilitySystemComponent* XMBAbilitySystemComponent;
	
	//创建属性集
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "AbilitySystem")
	UXMBAttributeSet* XMBAttributeSet;

	//Begin Apawn Interface
	virtual void PossessedBy(AController* NewController) override;
	//End Apawn Interface
};

6.在构造函数里创建，覆写函数体内

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#include "Character/CharacterBase.h"
#include "AbilitySystem/XMBAttributeSet.h"
#include "AbilitySystem/XMBAbilitySystemComponent.h"

ACharacterBase::ACharacterBase()
{
	PrimaryActorTick.bCanEverTick = false;
	//初始禁用 Tick，适合需要手动控制更新的场景。
	PrimaryActorTick.bStartWithTickEnabled = false;

	//禁用贴花接收，适用于性能优化或特定视觉需求。
	GetMesh()->bReceivesDecals = false;

	XMBAbilitySystemComponent = CreateDefaultSubobject<UXMBAbilitySystemComponent>(TEXT("XMBAbilitySystemComponent"));

	XMBAttributeSet = CreateDefaultSubobject<UXMBAttributeSet>(TEXT("XMBAttributeSet"));
}

UAbilitySystemComponent* ACharacterBase::GetAbilitySystemComponent() const
{
	return GetXMBAbilitySystemComponent();
}

void ACharacterBase::PossessedBy(AController* NewController)
{
	Super::PossessedBy(NewController);

	if (XMBAbilitySystemComponent)
	{
		XMBAbilitySystemComponent->InitAbilityActorInfo(this, this);
	}
	
}

7.进入到玩家控制的角色内（XMBCharacter）,对PossessedBy覆写

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//Begin Apawn Interface
	virtual void PossessedBy(AController* NewController) override;
	//End Apawn Interface

void AXMBCharacter::PossessedBy(AController* NewController)
{
	Super::PossessedBy(NewController);

	if (XMBAbilitySystemComponent && XMBAttributeSet)
	{
		GEngine->AddOnScreenDebugMessage(-1,5.f, FColor::Red, FString::Printf(TEXT("Owner: %s, Avatar : %s"),*XMBAbilitySystemComponent->GetOwnerActor()->GetActorLabel(),*XMBAbilitySystemComponent->GetAvatarActor()->GetActorLabel()));
	}
}

8.启动，能从日志里看到信息

9.我们需要给AbilitySystemComponent赋予Ability，当玩家尝试激活Ability时，实际上是从ASC中激活能力。对于激活的这一部分，我们可以自定义Ability的激活方式。

继续创建一个GameplayAbility的c++类，然后在其内创建一个激活策略的枚举，覆写两个函数

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

#pragma once

#include "CoreMinimal.h"
#include "Abilities/GameplayAbility.h"
#include "XMBGameplayAbility.generated.h"

//创建一个激活能力的策略枚举
UENUM()
enum class EXMBAbilityActivationPolicy : uint8
{
	OnTriggered,
	OnGiven
};
/**
 * 
 */
UCLASS()
class ARPG_GRIVITY_API UXMBGameplayAbility : public UGameplayAbility
{
	GENERATED_BODY()

public:
	 
	
protected:
	//设置激活策略
	UPROPERTY(EditDefaultsOnly, Category = "XMBAbility")
	EXMBAbilityActivationPolicy AbilityActivationPolicy = EXMBAbilityActivationPolicy::OnTriggered;

	//~ Begin UGameplayAbility Interface
	virtual void OnGiveAbility(const FGameplayAbilityActorInfo* ActorInfo, const FGameplayAbilitySpec& Spec) override;
	virtual void EndAbility(const FGameplayAbilitySpecHandle Handle, const FGameplayAbilityActorInfo* ActorInfo, const FGameplayAbilityActivationInfo ActivationInfo, bool bReplicateEndAbility, bool bWasCancelled) override;
	//~ End UGameplayAbility Interface
	
};

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


#include "AbilitySystem/Abilities/XMBGameplayAbility.h"

#include "AbilitySystem/XMBAbilitySystemComponent.h"

//在Ability被分配给AbilitySystemComponent后立即调用
void UXMBGameplayAbility::OnGiveAbility(const FGameplayAbilityActorInfo* ActorInfo, const FGameplayAbilitySpec& Spec)
{
	Super::OnGiveAbility(ActorInfo, Spec);

	if (AbilityActivationPolicy == EXMBAbilityActivationPolicy::OnGiven)
	{
		if (ActorInfo && !Spec.IsActive())
		{
			//Spec.Handle是FGameplayAbilitySpec对象的句柄，表示一个具体的能力实例
			ActorInfo->AbilitySystemComponent->TryActivateAbility(Spec.Handle);
		}
	}
}

void UXMBGameplayAbility::EndAbility(const FGameplayAbilitySpecHandle Handle,
	const FGameplayAbilityActorInfo* ActorInfo, const FGameplayAbilityActivationInfo ActivationInfo,
	bool bReplicateEndAbility, bool bWasCancelled)
{
	Super::EndAbility(Handle, ActorInfo, ActivationInfo, bReplicateEndAbility, bWasCancelled);

	if (AbilityActivationPolicy == EXMBAbilityActivationPolicy::OnGiven)
	{
		if (ActorInfo)
		{
			//Handle是FGameplayAbilitySpec对象的句柄，表示要清除的能力实例。
			ActorInfo->AbilitySystemComponent->ClearAbility(Handle);
		}
	}
}

10.启动引擎，右键即可创建一个刚才自己创建的gameplayability类，