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iOS Build a Simple iPhone App with Swift Structs As Data Models Finishing Up Our Model

Lana Wong
Lana Wong
3,968 Points
Posted by Lana Wong
Lana Wong
3,968 Points

Why can't you directly assign the FactProvider class to FactLabel text in the view controller?

Hi, I have not been here for a little while.

QUESTION: Why do you have to assign "Factprovider" to a new variable called "factProvider" in the view controller? Why does Swift not let you write:
FactLabal.text = Factprovider.randomFact()?

Thanks :)

Lana

3 Answers

Maria Angelica Dadalt
Maria Angelica Dadalt
6,197 Points
Maria Angelica Dadalt
Maria Angelica Dadalt
6,197 Points

Hi again. I went searching for the answer and I found it in the Swift Language Guide. https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/ClassesAndStructures.html Classes and Structs need instances (variables and constants) to give value to the properties inside them. Since you can use Classes and Structs multiple times, the use of constants and variables to access those objects can give you the flexibility to create many instances of the same Class or Struct. I hope this can help you. I recommend you read the guide. It helps a lot!

Lana Wong
Lana Wong
3,968 Points
Lana Wong
Lana Wong
3,968 Points

Thanks you so much! You explanation really helped! :)

Maria Angelica Dadalt
Maria Angelica Dadalt
6,197 Points
Maria Angelica Dadalt
Maria Angelica Dadalt
6,197 Points

Hi, I haven't been here long either, but I think it's because you are trying to access an object from another file and you can only do that if you assign it to a constant or variable.

I'll be sure to watch what others answer you so I can find this out for myself too!

Jeff McDivitt
Jeff McDivitt
23,970 Points
Jeff McDivitt
Jeff McDivitt
23,970 Points

Maria Angelica Dadalt is correct you need to access it from another file so you need to create a constant or variable. If I am not mistaken this is the lesson where Pasan starts explaining how to build projects using the MVC (Model View Controller) method; instead of putting everything in your view controller.