【UE4 C++ 基础知识】<4> 枚举 Enum、结构体 Struct

枚举

• UENUM宏搭配BlueprintType可以将枚举暴露给蓝图，不使用的话，仅能在C++使用

//定义一个原生enum class
enum class EMyType 
{
	Type1,
	Type2,
	Type3,
};

UENUM(BlueprintType)
enum class ECurrentState : uint8
{
	Idle UMETA(DisplayName="空闲"),
	Attack UMETA(DisplayName="攻击"),
	Roll UMETA(DisplayName="翻滚"),
	Dead UMETA(DisplayName="死亡"),
};

UPROPERTY(EditAnywhere,BlueprintReadWrite)
	ECurrentState MyCurrentState UMETA(DisplayName = "当前状态");

结构体

• BlueprintType可以将枚举暴露给蓝图

//结构体
USTRUCT(BlueprintType)
struct FMyStruct
{
    GENERATED_BODY()

    // 暴露给蓝图
    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category="Test Variables")
    int32 MyIntegerMemberVariable;

    // 不暴露给蓝图
    int32 NativeOnlyMemberVariable;

    // 蓝图图表无法访问此UObject指针，但是指针对UE4的反射、智能指针和垃圾回收系统可见。
    UPROPERTY()
    UObject* SafeObjectPointer;
};

UPROPERTY(EditAnywhere,BlueprintReadWrite)
	FMyStruct MyStruct;

• 继承FTableRowBase之后可以用于DataTable

struct FInventoryItemInfo : public FTableRowBase
{
	GENERATED_BODY()

	UPROPERTY(EditAnywhere, BlueprintReadWrite)
		FString ItemName UMETA(DisplayName="名称");

	UPROPERTY(EditAnywhere, BlueprintReadWrite)
		int32 index UMETA(DisplayName="编号");

	UPROPERTY(EditAnywhere, BlueprintReadWrite)
		bool bCanStaking UMETA(DisplayName="可否叠加");

	UPROPERTY(EditAnywhere, BlueprintReadWrite)
		int32 Count UMETA(DisplayName="数量");

	UPROPERTY(EditAnywhere, BlueprintReadWrite)
		UTexture2D* Icon UMETA(DisplayName="图标");

	UPROPERTY(EditAnywhere, BlueprintReadWrite)
		TSubclassOf<AActor> ItemClass;

	UPROPERTY(EditAnywhere, BlueprintReadWrite)
		USkeletalMesh* SkeletalMesh;
};

UPROPERTY(EditAnywhere,BlueprintReadWrite)
		FInventoryItemInfo EmptyItem;

参考

结构体