UE4函数标记BlueprintImplementableEvent和BlueprintNativeEvent区别

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本文深入探讨了在Unreal Engine 4(UE4)中，如何使用BlueprintImplementableEvent和BlueprintNativeEvent实现蓝图与C++代码的交互。详细讲解了这两种修饰符的区别，包括函数声明、定义及调用方式，以及蓝图如何重写实现这些函数。

/// This function is designed to be overridden by a blueprint. Do not provide a body for this function;
/// the autogenerated code will include a thunk that calls ProcessEvent to execute the overridden body.
BlueprintImplementableEvent,

       /// This function is designed to be overridden by a blueprint, but also has a native implementation.
       /// Provide a body named [FunctionName]_Implementation instead of [FunctionName]; the autogenerated
       /// code will include a thunk that calls the implementation method when necessary.
       BlueprintNativeEvent,

BlueprintImplementableEvent：在C++可以声明函数（不能定义，蓝图重写），在C++里调用该函数，蓝图重写实现该函数

BlueprintNativeEvent：在C++可以声明和定义函数，在C++里调用该函数，蓝图重写实现该函数（蓝图可以重写或不重写C++父类函数）

MyTPCharacter.h

函数声明（BlueprintImplementableEvent和BlueprintNativeEvent）：


	UFUNCTION(BlueprintImplementableEvent)
		void TestA();

	UFUNCTION(BlueprintImplementableEvent)
		int TestB();

	UFUNCTION(BlueprintImplementableEvent)
		void TestC(const FString& str);

	UFUNCTION(BlueprintImplementableEvent)
		int TestD(const FString& str);

	UFUNCTION(BlueprintNativeEvent)
		void TestE();

	UFUNCTION(BlueprintNativeEvent)
		int TestF();

	UFUNCTION(BlueprintNativeEvent)
		void TestG(const FString& str);

	UFUNCTION(BlueprintNativeEvent)
		int TestH(const FString& str);

MyTPCharacter.cpp

函数定义（BlueprintImplementableEvent不能定义和BlueprintNativeEvent定义）：

BlueprintNativeEvent修饰函数定义格式：函数名_Implementation

void AMyTPCharacter::TestE_Implementation()
{
	PrintScreenStr("TestE_Implementation");
}
int AMyTPCharacter::TestF_Implementation()
{
	PrintScreenStr("TestF_Implementation");
	return 1;

}
void AMyTPCharacter::TestG_Implementation(const FString& str)
{
	PrintScreenStr("TestG_Implementation " + str);
	
}
int AMyTPCharacter::TestH_Implementation(const FString& str)
{
	PrintScreenStr("TestH_Implementation " + str);
	return 1;
}

C++调用这些函数：

void AMyTPCharacter::OnRunEvent()
{

	 TestA();
	 TestB();
	 TestC("TestC");
	 TestD("TestC");
	 TestE();
	 TestF();
	 TestG("TestG");
	 TestH("TestH");

}

蓝图可以重写函数：如下图，选中重写实现

BlueprintImplementableEvent和BlueprintNativeEvent修饰函数，有返回值和没有返回值区别，如下

BlueprintImplementableEvent和BlueprintNativeEvent修饰函数，是否重写C++父类函数，如下

运行效果：

总结：BlueprintNativeEvent和BlueprintImplementableEvent修饰函数，如果没有函数返回值，那就是类似蓝图事件通知，如果有函数返回值，那就是类似蓝图函数重写；都可以传参和返回值；BlueprintNativeEvent修饰函数在C++有声明和定义实现，在蓝图可以覆写该函数，蓝图是否调用C++定义父类函数；BlueprintNativeEvent修饰函数只有声明,没有定义实现，只能在蓝图重写实现；BlueprintNativeEvent和BlueprintImplementableEvent修饰函数都只能在C++其他函数里调用。