Kodeco Forums

Enum-Driven TableView Development

🎓 Courses & Articles
1

In this tutorial, you will learn how to use Swift enums to handle the different states of your app to populate a table view.

This is a companion discussion topic for the original entry at https://www.raywenderlich.com/5542-enum-driven-tableview-development
2

Excellent tutorial.

I love the fact that you’re using values in the enum cases, then grabbing them in the switch statements. It’s a thing I don’t see a lot of swift devs using.

3

Thanks for a great tutorial.
For someone just beginning with Swift it has some great techniques.
Attaching [Recordings] to the .populated case is so clean and clever: I love it.
Not to mention reducing the reliance of checking for optionals.

4

Great tutorial. You increased my understanding of how enums with associated values can be used.

5

One of the best tutorials / code examples I’ve seen on RW. Bravo, Keegan!

Side Note: Swiftlint has major problems with adding any non-alpha characters in Enum names (such as an Array) - so if you use Swiftlint you’ll have to turn off those rules to get this project to build.

6

Hey Great one .

Please explain this

 func update(response: RecordingsResult) {
    if let error = response.error {
      state = .error(error)
      return
    }
    
    guard let newRecordings = response.recordings,
      !newRecordings.isEmpty else {
        state = .empty
        return
    }
    
    var allRecordings = state.currentRecordings
    allRecordings.append(contentsOf: newRecordings)
    
    if response.hasMorePages {
      state = .paging(allRecordings, next: response.nextPage)
    } else {
      state = .populated(allRecordings)
    }
  }

While paging What if Last page returns 0 elements then state = .empty will be executed and after that tableview will show empty view ? Can we fix this ?

7

@keeganrush Can you please help with this when you get a chance? Thank you - much appreciated! :]

8

Hey @prashantkt ,

The state is only set to .empty if there are no recordings. Only if response.recordings is nil, or if it is an empty array.

If there is a non-empty recordings array, but the RecordingsResult object has multiple pages, we enter the .paging state. Even if a particular page has 0 pages (which should never happen), you will still be in the .paging state, and the view will be populated with the recordings from the other pages.

I hope this helps! :]

9

This was just great! So much useful content that is immediately applicable. Thanks a lot RW team! Keep it coming!

10

@mett Really glad you enjoyed it! Cheers! :]

11

This tutorial is more than six months old so questions are no longer supported at the moment for it. Thank you!