【虚幻C++笔记】枚举UENUM、结构体USTRUCT

枚举(UENUM)

第一种:使用命名空间

UENUM(BlueprintType)
namespace MyEnumType
{
    enum MyCustomEnum
    {
       Type1,// 或者使用带 DisplayName别名 ==> Enum1 UMETA(DisplayName = "Type1"),
       Type2,
       Type3,
    }
}

//在蓝图中声明
UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "MyEnumType")
TEnumAsByte<MyEnumType::MyCustomType> MyEnumType;

第二种:继承uint8通过申明class类别名来替代

UENUM(BlueprintType)
enum class MyEnumType2 : uint8
{
  Enum1 UMETA(DisplayName = "Type1"),
  Enum2 UMETA(DisplayName = "Type2"),
  Enum3 UMETA(DisplayName = "Type3"),
  Enum4 UMETA(DisplayName = "Type4"),
};

//在蓝图中声明
UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "MyEnumType2")
TEnumAsByte<MyEnumType2> MyEnumType2;

结构体(USTRUCT)

// 暴露给蓝图
UPROPERTY(EditAnywhere, BlueprintReadWrite, Category="MyStructType")
int32 Age;
// 不暴露给蓝图
int32 Age;
// 蓝图图表无法访问此UObject指针，但是指针对UE的反射、智能指针和垃圾回收系统可见。
UPROPERTY()
UObject* ObjectPointer;

//注意，定义结构体名称前要加F前缀，不然编译不通过。
USTRUCT(BlueprintType)
struct FMyCustomStruct
{
  GENERATED_USTRUCT_BODY()

  UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "MyStructType")
  FString ID;
  UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "MyStructType")
  FString Name;
  UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "MyStructType")
  int32 Age;
  UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "MyStructType")
  float Height;
  UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "MyStructType")
  bool IsMan;
};

//结构体创建数据表格,需继承FTableRowBase
USTRUCT(BlueprintType)
struct FMyCustomStruct:public FTableRowBase
{
  GENERATED_USTRUCT_BODY()

  UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "MyStructType")
  FString ID;
  UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "MyStructType")
  FString Name;
  UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "MyStructType")
  int32 Age;
  UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "MyStructType")
  float Height;
  UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "MyStructType")
  bool IsMan;
};

//在蓝图中声明
UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "MyExposeOnSpawn", meta = (ExposeOnSpawn = "ExposeOnSpawnValue"))
FMyCustomStruct MyCustomStruct;