An iOS team with 5 members. Long term project, with both development and maintenance being handled within the team. Design the app and as the tech lead, implement the main fundamental functionalities.

Open Messenger/Messenger.xcodeproj, and Run (Cmd + R).

• Show a list of users retrieved from GitHub.
• Handle rate limit case.
• Pull to refresh list users.
• Paging loading.
• Support landscape and portrait.
• Images caching.
• Direct messaging screen functionalities.
• UI improved.
• Storing messages for each user.
• Following VIPER architechture.
• UnitTests.
• Swiftlint for coding styles & clean code.
• Support fastlane. Run fastlane scan in Xcode project directory.
• Prepared to support multi environments (dev and prod).

Messenger ├── Resources ├── Models ├── Modules ├── Core │ └── Image │ └── Persistence │ └── Helper | └── Extensions | └── Networking │ └── BaseVIPER | └── Presenter | └── Router | └── View MessengerTests 

VIPER is a very clean architecture. It isolates each module from others. So changing or fixing bugs are very easy as you only have to update a specific module. Also for having modular approach VIPER creates a very good environment for unit testing.

• Good for large teams.
• Makes it scalable. Enable developers to simultaneously work on it as seamlessly as possible.
• Makes it easy to add new features.
• Makes it easy to write automated tests since your UI logic is separated from the business logic.
• Makes it easier to track issues via crash reports due to the Single Responsibility Principle.
• Makes the source code cleaner, more compact, and reusable.
• Reduces the number of conflicts within the development team.
• Applies SOLID principles.
• Reduces the number of merge conflicts.

I created a VIPER Xcode template to make the work easier, reduce time for create new files and repeate the same code per module.

Installation Instruction

To create new module: Create new Group as your module name ---> Add new File --> Scroll down to select VIPER template --> type your module name.

A very lightweight URLSession wrapper to work with REST APIs. Easy to use and flexible with diffirent endpoints, methods.

networkClient.fetch(endPoint: ListUsersEndpoint.fetchListUser(lastId: lastId), type: [User].self) { (result) in switch result { case .success(let users): print("Fetched list users: \(users)") case .failure(let error): print("Error: \(error)") } }

Add test cases for each modules or base components to make sure we won't break it after changes. Can run fastlane scan [x] PersistenceTests. [x] ImagesCacheTests. [x] ListUsersTests. [x] DirectMessagesTests. [x] Support Mockable test or load data from local JSON.

1. Intergrate CI/CD with this repo, to double check every commit/PR pass the test cases.
2. Separate Chat sessions by date. And store it with CoreData/Realm, not UserDefault like current approach.
3. Add UI tests.