Simple iOS Application

Key feature of this app

• MVVM
• Swift 3
• Core Data
• Adaptive layout
• Unit Test for view model
• Pagination
• Custom delegates

Application has 2 screens

• Listing (user can search item using olx public API)
• ListViewController.swift
• ListingViewModel.swift
• Detail of item
• DetailViewController.swift

How it works

User can search by adding text in searchBar at listing screen. We check respective data in local storage, if we got data locally then show it in a tableview and user can refresh data using pull to refresh. Otherwise make web service call to olx API. We load more data once user scroll down and want to see more data. Error message shown if network issue or any other issue comes, user can retry by taping in error message.
UI of application is design in Main.storybaord. UI of application is adaptive to portrait and landscape orientations. User can see the difference by rotating there device on both listing and detail screen. Delegate approach is used in ListingViewModel.swift to notify viewcontroller any changes

Other important thing

• Unit test cases has written for view model ListingViewModel.swift in file ListingViewModelTests.swift
• Use Kingfisher for image cache

Improvement Area

• Fine-tune UI
• Further improvement in local storage (coredata)
• Some other edge cases
• Increase test case coverage

API Detail

• URL http://api-v2.olx.com/items
• request type : GET

Query Parameter

Nombre	Tipo	Descripción
location	string	For this exercise use www.olx.com.ar
searchTerm	string	(Required) Search term (e.g. "Peugeot", "iphone").
pageSize	integer	(Opcional) Result data size
offset	integer	(Opcional) Offset the list of returned business results by this amount.