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03-UnrealEngine/Gameplay/UObject/UnrealSpecifiers/Specifier/UPROPERTY/Blueprint/BlueprintCallable/BlueprintCallable.md

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+# BlueprintCallable
+
+- **功能描述：** 在蓝图中可以调用这个多播委托
+
+- **元数据类型：** bool
+- **引擎模块：** Blueprint
+- **限制类型：** Multicast Delegates
+- **作用机制：** 在PropertyFlags中加入[CPF_BlueprintCallable](../../../../Flags/EPropertyFlags/CPF_BlueprintCallable.md)
+- **常用程度：** ★★★
+
+在蓝图中可以调用这个多播委托。
+
+## 示例代码：
+
+```cpp
+DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FMyDynamicMulticastDelegate_One, int32, Value);
+
+UPROPERTY(EditAnywhere, BlueprintReadWrite, BlueprintAssignable, BlueprintCallable)
+	FMyDynamicMulticastDelegate_One MyMulticastDelegateAssignAndCall;
+
+UPROPERTY(EditAnywhere, BlueprintReadWrite, BlueprintCallable)
+	FMyDynamicMulticastDelegate_One MyMulticastDelegateCall;
+
+UPROPERTY(EditAnywhere, BlueprintReadWrite, BlueprintAssignable)
+	FMyDynamicMulticastDelegate_One MyMulticastDelegateAssign;
+
+UPROPERTY(EditAnywhere, BlueprintReadWrite)
+	FMyDynamicMulticastDelegate_One MyMulticastDelegate;
+```
+
+## 示例效果：
+
+![Untitled](Untitled.png)
+
+注意BlueprintAssignable和BlueprintCallable只能用于多播委托：
+
+```cpp
+DECLARE_DYNAMIC_DELEGATE_OneParam(FMyDynamicSinglecastDelegate_One, int32, Value);
+
+//编译报错：'BlueprintCallable' is only allowed on a property when it is a multicast delegate
+UPROPERTY(EditAnywhere, BlueprintReadWrite, BlueprintCallable)
+	FMyDynamicSinglecastDelegate_One MyMyDelegate4;
+
+	//编译报错：'BlueprintAssignable' is only allowed on a property when it is a multicast delegate
+UPROPERTY(EditAnywhere, BlueprintReadWrite, BlueprintAssignable)
+	FMyDynamicSinglecastDelegate_One MyMyDelegate5;
+```