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The goal was to design and implement a clean and testable MVVM production application.

[Project requirements] are detailed here.

TTableViewBuilder Sample

    let p1 = TBasicTableRow(title: "John", detailText: "a")
    let p2 = TBasicTableRow(title: "Kate", detailText: "b")        
    let persons = Array(arrayLiteral: p1,p2)        
    let dataSource = TTableDataSource(sections: [TSection(title: "Person", rows: persons)])
    
    builder = TTableViewBuilder(source: dataSource)
        .debug(true)
        .cellType(.Dynamic)
        .customTableCellName("TCustomTableViewCell")
        .onSelection { (indexPath, emlement) -> Void in
            print("You selected cell #\(indexPath.row)!")
        }
        .bind(tableView)

THttpResource Sample

    THttpResource()
        .debug(true)
        .url("http://example.com/")
        .onStringResponseHandler { (json) in
            let list = Mapper<TBasicTableRow>().mapArray(JSONString: json)
        }
        .onDataResponseHandler({ (data) in
            print(data)
        })
        .onErrorHandler({ (error) in
            print(error.localizedDescription)
        })
        .start()

TBundleFile Sample

TBundleFile(fileName: "product", ext: "pist")
    .dataType(.dictionary)
    .onSuccessDictionayHandler { (dic) in
        print(dic)
    }
    .onSuccessArrayHandler({ (array) in
        print(array)
    })
    .onFailure()
    .start()

TSequeBuilder Sample

ObjectMapper Sample

     let user = Mapper<User>().map(JSONString: JSONString)
     let JSONString = Mapper().toJSONString(user, prettyPrint: true)
     let list = Mapper<TBasicTableRow>().mapArray(JSONString: json)

Architecture - MVVM

• Thin ViewControllers
  • No mutable states
  • No callbacks
  • PostsViewController: 86 lines
  • PostDetailTableViewController: 32 lines
• Testable View Model
  • Supply all ViewControllers states
  • Capture all business logics
  • Ability to init with mock data for Unit Test
  • Unit Test demoed by testFindUserById
• Unified Error Handler
  • Protocol ErrorHandler with default behavior
  • Custom behavior for ViewContollers
• Dependency Injection
  • External dependencies are injected for all ViewControllers
  • Captured in dedicated struct InjectedProperty
• Resource Abstraction
  • Extendable self-contained generic Resource struct
• Offline support
  • Cache data with CoreData framework
  • Persistable protocol for extension

User Interface

• Pull to refresh
• Auto resizing UITableViewCell
• Dynamic Font size

Discussion

• Preload or on demand lazy loading remote resources
  • The app loads all 3 resources at one go to avoid waiting while user navigate to detail screen
  • Static remote resources
  • Few resources
  • While applicable, should prefer on-demand requests
• Third party library
  • Conditions to integrate third party library

Technical Debt

• Localization
• UI styling
• Full code coverage Unit Tests
• UI Tests
• iPhone Only
• Lack of custom application error type
• Comments and Documentation
• CI integration

Developement Environment

• Xcode 8.3
• Swift 3

Cocoapods Dependencies

• pod "PromiseKit", "~> 4.0"
• pod 'ObjectMapper', '~> 2.2'
• pod 'MBProgressHUD', '~> 1.0.0'
• pod 'ReactiveCocoa', '~> 5.0.0'
• pod 'Static', git: 'https://github.com/venmo/Static'
• pod "MagicalRecord"