Unreal Engine 4 Scripting with C++ Cookbook

Implementing a simple interaction system with UInterfaces

This recipe will show you how to combine a number of other recipes in this chapter to demonstrate a simple interaction system, and a door with an interactable doorbell to cause the door to open.

How to do it...

1. Create a new interface, Interactable.
2. Add the following functions to the IInteractable class declaration:

   UFUNCTION(BlueprintNativeEvent, BlueprintCallable, Category=Interactable)
   boolCanInteract();
   UFUNCTION(BlueprintNativeEvent, BlueprintCallable, Category = Interactable)
   voidPerformInteract();

3. Create default implementations for both functions in the implementation file:

   boolIInteractable::CanInteract_Implementation() { return true; } voidIInteractable::PerformInteract_Implementation() ...