An application that allows users to browse a list of surveys. For the UI:

         Loading Screen           ->          Surveys Screen           ->           Survey Detail 

Link: https://youtu.be/T1JwIzzWBqA

• iOS 10.0+
• Xcode 10+

Remember to run pod install before running the project.

• LoadingViewController.swift: get access token and surveys data.
• SurveysViewController.swift: allows users to browse a list of surveys, reload surveys data and direct user to see the survey details.
• SurveyDetailViewController.swift: display selected survey detail informations.
• Main.storyboard: includes all the UI of the 3 screens.
• APIServices.swift: using Alamorfire to communicate with Nimble server to get data. All API's requests should come from here.

• VerticalPageControlView.swift: a custom of UIScrollView to emulate a vertical page control.
• VerticalPageControlViewModel.swift: is the model of VerticalPageControlView, which contains logics, validations, model properties/functions of the Vertical Page Control.
• VPCHelpers.swift: contains VPCButtonHelper and VPCPageHelper to help haandling logic for Vertical Page Control.
• VPCValidations.swift: contains VPCValidationService and VPCValidationError to help about validations for Vertical Page Control.