Rebinding Keys at runtime in Unreal Engine 4.

RebindAction.cpp

void RebindAction(FName ActionName, FKey NewKey) {
	// Adapted from Rama's VictoryBPFunctionLibrary (https://wiki.unrealengine.com/Rebinding_Keys_At_Runtime_in_Packaged_Game)
	UInputSettings* Settings = const_cast<UInputSettings*>(GetDefault<UInputSettings>());
	if (Settings) {
		TArray<FInputActionKeyMapping>& Actions = Settings->ActionMappings;
		for (FInputActionKeyMapping& Each : Actions)
		{
			if (Each.ActionName == ActionName) {
				Each.Key = NewKey;
				UE_LOG(LogTemp, Warning, TEXT("%s is triggered by %s"), *Each.ActionName.ToString(), *Each.Key.ToString());
			}

		}
		//SAVES TO DISK
		const_cast<UInputSettings*>(Settings)->SaveKeyMappings();
		//REBUILDS INPUT, creates modified config in Saved/Config/Windows/Input.ini
		for (TObjectIterator<UPlayerInput> It; It; ++It)
		{
			It->ForceRebuildingKeyMaps(true);
		}
	}
}