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