TopCoins

TopCoins is my submission on the iOS Take Home Test.

Below are some things I would like to address:

• The application uses a mixture of UIKit and SwiftUI code, where the most of the UI is built with UIKit (navigation, tabs, screens) but certain small views are built with SwiftUI (performance graphs, some collection view cell content).

• The application uses the MVVM+C pattern, with a custom implementation of the coordinator pattern as my goal was not to use any external frameworks.

• The application uses Combine observation for most of the ViewController - ViewModel communication for backwards compatibility, but easily be updated to Swift Concurrency, if needed.

• The chosen networking stack is testable (see APIURLTests.swift) to the point where we can have mock response JSONs for any endpoint URL (although just some cases are mocked in the demo).

• The bookmarking is implemented using a UserDefaults, so the bookmarks are saved on the device. This can easily be modified to rely on an external API.

• The testing coverage of the project is above 85%. Tested are most of the units and some of the UI interaction (searching, bookmarking)

API secret setup

In order to properly authenticate your requests, and experience the app as intended, an access token is needed for the Coinranking API

To do so, please follow the steps below:

1. Generate a token

   To generate the API token, follow the instructions at the Coinranking developer portal

2. Set the token in an environment variable.

   For best results the environment variable should can stored in your shell .*rc file which gets loaded for every user session. I am using zsh, so i am adding the following at the end of my .zshrc file :

   COINRANKING_API_SECRET=coinranking...

3. Restart the session or reload it with the following command:

   source ~/.zshrc

4. Confirm that you can see your newly created variable by invoking

   printenv

   Author Info

   Ilian Konchev (ilian@snappmobile.io)

   Software Engineer, SnappMobile Germany GmbH