Unreal Engine 4 Scripting with C++ Cookbook

Calling Blueprint-defined interface functions from C++

While the previous recipes have focused on C++ being usable in Blueprint, such as being able to call functions from C++ in Blueprint, and override C++ functions with Blueprint, this recipe shows you the reverse: calling a Blueprint-defined interface function from C++.

How to do it...

1. Create a new UInterface called UTalker/ITalker.
2. Add the following UFUNCTION implementation:

   UFUNCTION(BlueprintNativeEvent, BlueprintCallable, Category = Talk)
   void StartTalking();

3. Provide a default empty implementation inside the .cpp file:

   void ITalker::StartTalking_Implementation()
   {
   
   }

4. Create a new class based on StaticMeshActor.
5. Add #include and modify the class declaration to include the talker interface:

   #include ...