这篇随笔用于忘记AttributeSet是什么后快速想起来和上手
AttributeSet属性集是表示Actor各种属性值的集合，保存在ASC中，是GE的主要作用目标
比如继承一个AttributeSet后
新建公有成员变量：
UPROPERTY(BlueprintReadOnly , Category = "Health", ReplicatedUsing = OnRep_Health)
FGameplayAttributeData Health;
ATTRIBUTE_ACCESSOTS(UBasicAttributeSet,Health)
其中ReplicatedUsing = OnRep_Health是强制委托，当这个值被改变时调用OnRep_Health函数ATTRIBUTE_ACCESSOTS属性访问器宏是在属性声明后给属性添加的宏，其定义在源码AttributeSet.h最后：
#define ATTRIBUTE_ACCESSORS(ClassName,PropertyName)\
GAMEPLAYATTRUBUTE_PROPERTY_GETTER(ClassName,PropertyName)\
GAMEPLAYATTRUBUTE_VALUE_GETTER(PropertyName)\
GAMEPLAYATTRUBUTE_VALUE_SETTER(PropertyName)\
GAMEPLAYATTRUBUTE_VALUE_INITTER(PropertyName)
GAMEPLAYATTRUBUTE_PROPERTY_GETTER(ClassName,PropertyName)\
GAMEPLAYATTRUBUTE_VALUE_GETTER(PropertyName)\
GAMEPLAYATTRUBUTE_VALUE_SETTER(PropertyName)\
GAMEPLAYATTRUBUTE_VALUE_INITTER(PropertyName)
代表四个方法：
拿到属性：static FGameplayAttribute UMyHealthSet::GetHealthAttribute();
拿到值：FORCEINLINE float UMyHealthSet::GetHealth()const;
设置值：FORCEINLINE void UMyHealthSet::SetHealth(float NewVal);
初始化值：FORCEINLINE void UMyHealthSet::InitHealth(float Newval);
拿到值：FORCEINLINE float UMyHealthSet::GetHealth()const;
设置值：FORCEINLINE void UMyHealthSet::SetHealth(float NewVal);
初始化值：FORCEINLINE void UMyHealthSet::InitHealth(float Newval);
新建公有成员函数：
更改属性之前调用：virtual void PreAttributeChange(const FGameplayAttribute& Attribute,float& NewValue) override;
更改属性之后调用：virtual void PostGameplayEffectExecute(const FGameplayEffectModCallbackData& Data) override;
更改属性之后调用：virtual void PostGameplayEffectExecute(const FGameplayEffectModCallbackData& Data) override;
配置好GE后给玩家类(比如Character)添加:
protected:
protected:
UPROPERTY()
class UBasicAttributeSet* BasicAttributeSet;
并且在构造函数里面初始化：
BasicAttributeSet = CreateDefaultSubobject<UBasicAttributeSet>(TEXT("BasicAttributeSet"))
然后在其他类里读取值就是：获得玩家类->GetAbilitySystemComponent->GetFloatAttributeFromAbilitySystemComponent
改变值就是：获得玩家类->GetAbilitySystemComponent->ApplyGameplayEffectToSelf调用一个GE修改该值
class UBasicAttributeSet* BasicAttributeSet;
并且在构造函数里面初始化：
BasicAttributeSet = CreateDefaultSubobject<UBasicAttributeSet>(TEXT("BasicAttributeSet"))
然后在其他类里读取值就是：获得玩家类->GetAbilitySystemComponent->GetFloatAttributeFromAbilitySystemComponent
改变值就是：获得玩家类->GetAbilitySystemComponent->ApplyGameplayEffectToSelf调用一个GE修改该值