Bluprintable NotBlueprintType EditAnywhere EditDefaultsOnly EditInstanceOnly 这几个宏的作用

川长思鸟来 2022-07-11 09:27 83阅读 0赞

创建基于UE4父类的代码

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1.  UCLASS() 
2.  **class** VR\_API ALoadStreamingLevelActor : **public** AActor 
3.  \{ 
4.   GENERATED\_BODY() 
5.  
6.  **public**: 
7.  // Sets default values for this actor's properties
8.   ALoadStreamingLevelActor(); 
9.  
10. // Called when the game starts or when spawned
11. **virtual****void** BeginPlay() override; 
12. 
13. // Called every frame
14. **virtual****void** Tick( **float** DeltaSeconds ) override; 
15. 
16.  UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = LoadedLevelName) 
17.  FName LevelName; 
18. 
19.  UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = LoadedLevelName) 
20.  FName PackageName; 
21. \};

默认情况下上边的UCLASS() 宏同下图中UCLASS（Blueprintable）的作用是一样的。这样声明的类在UE4中是可以创建基于此类的蓝图子类。

![SouthEast][]

如果不想让C++类能创建蓝图子类，则只需把 Blueprintable 替换为NotBlueprintable。修改代码如下

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1.  UCLASS(NotBlueprintable) 
2.  **class** VR\_API ALoadStreamingLevelActor : **public** AActor 
3.  \{ 
4.   GENERATED\_BODY() 
5.  
6.  **public**: 
7.  // Sets default values for this actor's properties
8.   ALoadStreamingLevelActor(); 
9.  
10. // Called when the game starts or when spawned
11. **virtual****void** BeginPlay() override; 
12. 
13. // Called every frame
14. **virtual****void** Tick( **float** DeltaSeconds ) override; 
15. 
16.  UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = LoadedLevelName) 
17.  FName LevelName; 
18. 
19.  UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = LoadedLevelName) 
20.  FName PackageName; 
21. \};

修改编译完后，在UE4中就无法创建基于此C++的蓝图子类了

![SouthEast 1][]

在UCLASS（）宏参数中还有一个名为NotBlueprintType的宏，这个宏的意思是在蓝图中无法创建基于此c++类的变量。而基于此C++类的蓝图子类则不受此限制。

代码和效果如下

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1.  UCLASS(Blueprintable, NotBlueprintType) 
2.  **class** VR\_API ALoadStreamingLevelActor : **public** AActor 
3.  \{ 
4.   GENERATED\_BODY() 
5.  
6.  **public**: 
7.  // Sets default values for this actor's properties
8.   ALoadStreamingLevelActor(); 
9.  
10. // Called when the game starts or when spawned
11. **virtual****void** BeginPlay() override; 
12. 
13. // Called every frame
14. **virtual****void** Tick( **float** DeltaSeconds ) override; 
15. 
16.  UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = LoadedLevelName) 
17.  FName LevelName; 
18. 
19.  UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = LoadedLevelName) 
20.  FName PackageName; 
21. \};

此时ALoadStreamingLevel类是搜索不到的

![SouthEast 2][]

EditAnyWhere: 此成员变量在蓝图编辑器中和关卡细节面板中都会被暴露出来

EditDefaultsOnly: 此成员变量只会在蓝图编辑器中被暴露出来

EditInstanceOnly: 此成员变量只会在关卡细节面板中被暴露出来

蓝图编辑器中：

![SouthEast 3][]

拖拽到Level中：

![SouthEast 4][]

本文转自：http://blog.csdn.net/xi\_niuniu/article/details/54409648

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[SouthEast]: /images/20220711/84a9bdb85e19415281fa9a90403eccac.png
[SouthEast 1]: /images/20220711/6ff396d247b54233bf9f81b32fe5df2e.png
[SouthEast 2]: /images/20220711/ef45236d2568481f9a1c90cce5c98fc1.png
[SouthEast 3]: /images/20220711/542a0ac380aa4635ad7724ad86101cbe.png
[SouthEast 4]: /images/20220711/b462c26c3cec45fc911509b730ca7b05.png