How CreateWidget() works?

Development Programming & Scripting
1

I know, a bit silly question, but how it works? In documentation there are only arguments, but I don’t understand the way it works. And if it’s possible, please help with this problem:
.h:

UCustomUserWidget* FadeWidget;
...
UPROPERTY(EditDefaultsOnly, Category = "Widgets")
		TSubclassOf<UCustomUserWidget> FadeWidgetClass;

.cpp:

FadeWidget = CreateWidget<UCustomUserWidget>(GetWorld(), FadeWidgetClass);

And it says CreateWidget called with a null class about FadeWidgetClass.
UCustomUserWidget is c++ class that I created.

2

If your cpp line is in constructor, then at this point FadeWidgetClass is still nullptr, even if it’s defined in derived blueprint.

If this is the case, then I can suggest to move this initialization in any moment later, for example on BeginPlay

3

It is placed on BeginPlay in my PlayerController file.

4

Are you sure you have assigned FadeWidgetClass in the editor? I think it is null

5

No, I didn’t.

  1. I don’t understand what is FadeWidgetClass in CreateWidget() arguments, could you, please, explain why do I need it?
  2. How to assign class in the EDITOR, and what do I need to have in this assignment?
6

Finally, I found how to do it. I know, maybe I’m stupid, because I didn’t find it before. Here it is. I just had to set it in Class Defaults of my BP Player Controller to BP subclass of my CustomUserWidget:
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