在属性变化时-PreAttributeChange

virtual void PreAttributeChange(const FGameplayAttribute& Attribute, float& NewValue) override;
exmple：

void UAuraAttributeSet::PreAttributeChange(const FGameplayAttribute& Attribute, float& NewValue)
{
    Super::PreAttributeChange(Attribute, NewValue);

    if (Attribute == GetHealthAttribute())
    {
        NewValue = FMath::Clamp(NewValue, 0.0f, GetMaxHealth());
    }
    if (Attribute == GetMaxHealthAttribute())
    {
        //NewValue = FMath::Clamp(NewValue, 0.0f, GetMaxHealth());
    }
    if (Attribute == GetManaAttribute())
    {
        NewValue = FMath::Clamp(NewValue, 0.0f, GetMaxMana());
    }
    if (Attribute == GetMaxManaAttribute())
    {
        //NewValue = FMath::Clamp(NewValue, 0.0f, GetMaxMana());
    }
}