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UE4 UFUNCTION常用的的元信息宏

参考原文： UE4-常见的宏-UFUNCTION

BlueprintCallable

该函数可以在蓝图或关卡蓝图图表中执行

public: 
    UFUNCTION(BlueprintCallable, Category = "Snowing,BlueprintFunc")
    void BlueprintCallableFunction();

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BlueprintImplementableEvent

此函数可以在蓝图或关卡蓝图图表内进行重载 不能修饰private级别的函数，函数在C++代码中不需要实现定义

public:
    UFUNCTION(BlueprintImplementableEvent, meta = (DisplayName = "Blueprint Implementable Event Function"), Category = "Snowing|BlueprintFunc")
    float BlueprintImplementableEventFunction(float In_Float);

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Category

Category = TopCategory|SubCategory|Etc

指定函数在编辑器中的显示分类层级，| 是分层级的符号

UFUNCTION(BlueprintPure, Category = "Snowing|BlueprintFunc")
AActor* BlueprintPureFunction();

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元数据说明符

用法：UFUNCTION( [函数说明符], meta = (元数据说明符) )

CommutativeAssociativeBinaryOperator=”true”

指示BlueprintCallable函数应该使用“Commutative Associative Binary”节点。该节点缺少引脚名称，但具有创建附加输入引脚的“Add Pin”按钮

//.h文件函数声明
UFUNCTION(BlueprintPure, meta = (DisplayName = "Add Pin Function", CommutativeAssociativeBinaryOperator = "true"), Category = "Snowing|Parameters")
    float CommutativeAssociativeBinaryOperatorFunction(const float A, const float B);

//.cpp文件行数定义
float AActorTest::CommutativeAssociativeBinaryOperatorFunction(const float A, const float B)
{
    float Result{0.f};
    Result += A;
    Result += B;

    return Result;
}

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CompactNodeTitle=”Name”

指示BlueprintCallable函数应在紧凑显示模式下显示，并提供在该模式下显示的名称 

UFUNCTION(BlueprintCallable, meta = (AutoCreateRefTerm = "In_Int32", CompactNodeTitle = "CompactNodeTitleFunction"), Category = "Snowing|Parameters")
    int32 AutoCreateRefTermFunction(UPARAM(Ref) int32& In_Int32);

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DisplayName=”Blueprint Node Name”

蓝图中此节点的名称将替换为此处提供的值，而不是代码生成的名称（在蓝图中搜索被修饰函数也用这里提供的值）

HidePin=”Parameter”

对于BlueprintCallable函数，这表示参数引脚应该隐藏在用户的视图中。请注意，每个功能只能有一个参数引脚以这种方式隐藏 

UFUNCTION(BlueprintCallable, meta = (HidePin = "In_Float"), Category = "Snowing|Parameters")
    void HidePinFunction(int In_Int, float In_Float, FString In_FString, TArray<AActor*> In_TArray);

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