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Technical challenge: MovieDatatbaseCompanion

iOS application using an universal framework taking care of the communication with The Movie Database. Result of a 40 hour technical coding challenge for the company 2coders.

API Documentation

The documentation of API can be found here.

API Key

To access the API the individual API Key for Bearer authentication needs to be registered with the core client before first use. For privacy reasons the API-Key is not checked-in but placed in a file called 'apikey.secret' that needs to be created on a individual basis for each checked out project. The 'apikey.secret' should not be commited and is excluded via .gitignore file. The project itself and also library's Unit Tests define a global constant 'let apiKey: String' that reads the value from file.

3rd Party Libraries

Pinterest's PINCache is used to achieve caching for downloaded images. By default it's running in memory but can also be connfigured for using a on-disk cache.

Show-case

  • load and display of movies and series
  • details for movies and series
  • load and display of trending movies
  • search for movies and series (search input throttled)
  • TMDB-API interaction is handled by a multiplatform core framework
  • framework with 90+ code coverage (Swift Test)
  • adaptive grid layout for content
  • progressive image loading (low-res first, hi-res second)
  • necessary image size gets determined depending on the device size class
  • Image caching (in memory) to prevent unneccesary requests of resources
  • simple local favorite list (Swift Data)
  • offline mode allowing to browse favorites
  • dark / light mode adaptive design
  • rotation independent multi-device layout (iPad/ iPhone)
  • shared Xcode schemes with different build configurations
  • code linting with swiftlint

Given challenge PDF exerpt

The test will require building different screens based on “The Movie Db” service. Reference: https://developers.themoviedb.org

  1. Main Screen - Trending Movies: a) Must show a list of movies within a collection view within a custom layout. b) Must be paginated through infinite scrolling. c) The entity must show a title, an image* , and a short description.
  2. Details Screen: Once you pick a movie, the application must open a new screen with the details of the selected movie. a) The screen must show extended content apart from the standard information, such as ratings, votes, authors - feel free to add as much information as you want. (Scrollable)
  3. Search screen: Search content. The app must be able to search for different movies and series, selecting which one in advance. The search feature must be throttleable.
  • all images should be fetched based on the view size

####Bonus features:

  • Ability to have a favorite list (locally), but also indication on the entity itself
  • Offline mode (storage of choice)
  • Pre-cached via concurrent/queue download of content for immediate access
  • Low-res images before accessing the final version
  • Image caching mechanism
  • Build a .xcframework core within the model to be consumed for tvOS, iOS, iPadOS & macOS

####Technical details: ➢ Usage of more advanced architectures like MVVM , TCA or some similar. ➢ Free to use SwiftUI but must show some knowledge of UIKit or vice-versa. ➢ Use SPM/Cocoapods for any dependency that might be required apart from networking, that should be native ➢ Design, style, and animations as you prefer ➢ Test code coverage. ➢ Integrate SwiftLint within XCode (introduce some rules) ➢ The interface must work on iPad and iOS in landscape and portrait mode. Feel free to adapt the design to look better based on the screen size. ➢ Environment (i.e. Prod/Dev)t selection via scheme within its configuration ➢ The assignment must be delivered via Git repository, containing commit history ➢ English might drive the development of the exercise, files, comments, classes, etc.

####Goals: ❖ Prove mastery of advanced programming swift skills and concepts on different Apple platforms. ➢ Good knowledge of advanced architectures. ➢ Protocol-oriented programming. ➢ Object-oriented programming. ➢ Classes, objects and management of access control levels. ➢ Generics ➢ Working with Rest API & JSON data ➢ Native networking management in Swift ➢ Different request management: Queue and concurrency. ❖ Xcode environments, schemes & applications capabilities: ➢ Shared schemes ➢ Environment variables from the Xcode env when running a target in debug.

❖ Knowledge and experience with writing code to support cross-platform (iOS/iPadOS/tvOS/visionOS), as well as handling older OS version (deprecating APIs) ❖ Experience with advanced Interface-builder concepts, including: ➢ Strategies for proper sourcing & instantiation of interface builder .xib & .storyboard. ➢ Variable auto layout traits for universal applications (iOS & iPadOS) that support all device classes & device orientations ❖ Clean code practices: ➢ Avoidance of overly complex code and common pitfalls such as cyclomatic dependencies, repeated code, large function signatures, very long lines of code, etc. ❖ Advanced experience using Xcode’s XCTest Suite, including: ➢ 80+% code coverage in XCTests for the framework target ➢ Writing XCTests with expectations to succeed/fail ➢ Tests that cover asynchronous code. ➢ Recording & running UITests