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"VOODO and Creating the UI" apiService Error

App Development
#1

I am following Stewart Lynch’s excellent second video in the concurrency series and encountering an issue when calling the apiService.

Stewart’s code can be seen at this timestamp https://youtu.be/_tnbwaHpJpM?t=321

My code is here github. Relevant files are:

  • APIService
  • UsersListViewModel (error is here)
  • Models [Users, Posts]

(the forum wouldn’t allow me to post more than 2 links, so I couldn’t separate them – sorry about that!)

The error messages read:

  • Cannot convert value of type '(Result<[User], APIError>) -> Void' to expected argument type '(Result<[User], Error>) -> Void'
  • Cannot convert value of type '(Result<[User], APIError>) -> Void' to expected argument type '(Result<[User], Error>) -> Void'

I reviewed video 1 to ensure the User struct matched. The APIError is referencing a valid Error type. And the function isn’t returning anything, so it satisfied Void. I’m stumped! Is anyone else experiencing this?

#2

In your DataService code there is an error in your getJSON function signature.

Where you have:

.....completion: @escaping (Result<T, Error>) -> Void) {

It needs to be:

.....completion: @escaping (Result<T, APIError>) -> Void) {
1 Like
#3

Wow, thanks @Chris_Parker! Right in front of me the whole time, of course.

Much appreciated. Very grateful for your support.