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Building Fabric.app in Swift "Building Fabric.app in Swift" - Javier Soto. April 2016 1

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Intro @Javi "Building Fabric.app in Swift" - Javier Soto. April 2016 2

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"Building Fabric.app in Swift" - Javier Soto. April 2016 3

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Outline 4 What is Fabric.app? 4 Tools used 4 Architecture 4 Better with Swift 4 Error reporting "Building Fabric.app in Swift" - Javier Soto. April 2016 4

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What is Fabric.app? "Building Fabric.app in Swift" - Javier Soto. April 2016 5

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What is Fabric.app? "Building Fabric.app in Swift" - Javier Soto. April 2016 6

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What is Fabric.app? "Building Fabric.app in Swift" - Javier Soto. April 2016 7

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Tools "Building Fabric.app in Swift" - Javier Soto. April 2016 8

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Dependency management "Building Fabric.app in Swift" - Javier Soto. April 2016 9

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Dependency management 4 SSL Pinning 4 Keychain 4 1Password integration 4 Graphs 4 Networking, caching "Building Fabric.app in Swift" - Javier Soto. April 2016 10

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Dependency management 4 CocoaPods 4 Carthage "Building Fabric.app in Swift" - Javier Soto. April 2016 11

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CocoaPods 4 More widely adopted 4 Less work to integrate frameworks 4 Easily link some frameworks only in Debug "Building Fabric.app in Swift" - Javier Soto. April 2016 12

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Carthage 4 Precompilation == Speed "Building Fabric.app in Swift" - Javier Soto. April 2016 13

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Swift Package Manager "Building Fabric.app in Swift" - Javier Soto. April 2016 14

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Interface Builder "Building Fabric.app in Swift" - Javier Soto. April 2016 15

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AutoLayout "Building Fabric.app in Swift" - Javier Soto. April 2016 16

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AutoLayout "Building Fabric.app in Swift" - Javier Soto. April 2016 17

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Storyboards "Building Fabric.app in Swift" - Javier Soto. April 2016 18

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UIStoryboard class UIStoryboard { func instantiateViewControllerWithIdentifier(_ identifier: String) -> UIViewController } "Building Fabric.app in Swift" - Javier Soto. April 2016 19

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UIStoryboard let vc = mainStoryboard.instantiateViewControllerWithIdentifier("ApplicationOverviewID") as! ApplicationOverviewVC vc.userSession = ... vc.applicationID = ... "Building Fabric.app in Swift" - Javier Soto. April 2016 20

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UIStoryboard final class ApplicationOverviewVC { // I hope you like "!"s... var userSession: UserSession! var applicationID: String! func viewDidLoad() { super.viewDidLoad() self.userSession.foo() } } "Building Fabric.app in Swift" - Javier Soto. April 2016 21

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Storyboards final class ApplicationOverviewVC { let userSession: UserSession let applicationID: String init(userSession: UserSession, applicationID: String) { self.userSession = userSession self.applicationID = applicationID super.init(nibName: ..., bundle: ...) } func viewDidLoad() { super.viewDidLoad() // Compile-time guarantee of object fully initialized self.userSession.foo() } } "Building Fabric.app in Swift" - Javier Soto. April 2016 22

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Fastlane "Building Fabric.app in Swift" - Javier Soto. April 2016 23

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Fastlane - https://github.com/fastlane/examples "Building Fabric.app in Swift" - Javier Soto. April 2016 24

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ReactiveCocoa "Building Fabric.app in Swift" - Javier Soto. April 2016 25

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ReactiveCocoa self.accountService.muteAllNotifications(untilTime: date) "Building Fabric.app in Swift" - Javier Soto. April 2016 26

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ReactiveCocoa self.accountService.muteAllNotifications(untilTime: date) .continueWhenApplicationIsBackgrounded(taskName: "Muting notifications") "Building Fabric.app in Swift" - Javier Soto. April 2016 27

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Tools "Building Fabric.app in Swift" - Javier Soto. April 2016 28

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Architecture "Building Fabric.app in Swift" - Javier Soto. April 2016 29

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Architecture FabricAPI.framework "Building Fabric.app in Swift" - Javier Soto. April 2016 30

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Architecture 4 Massive View Controllers 4 View Models 4 Glue-code View Controllers 4 Table View Data sources "Building Fabric.app in Swift" - Javier Soto. April 2016 31

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Architecture GenericTableViewDataSource "Building Fabric.app in Swift" - Javier Soto. April 2016 32

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Architecture GenericTableViewDataSource protocol TableSectionType { associatedtype AssociatedTableRowType: TableRowType var rows: [AssociatedTableRowType] { get } var title: String? { get } } protocol TableRowType { } "Building Fabric.app in Swift" - Javier Soto. April 2016 33

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Architecture GenericTableViewDataSource final class GenericTableViewDataSource : NSObject, UITableViewDataSource "Building Fabric.app in Swift" - Javier Soto. April 2016 34

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Architecture GenericTableViewDataSource enum ProjectIssueRow: TableRowType, Equatable { case Loading case NoIssues case ErrorLoadingIssues case ProjectIssue(Issue) } return GenericTableViewDataSource( tableView: tableView, tableViewData: observableProperty, // Observable computeSections: { elements in ... }, /// Pure function from `Elements` to `[SectionType]` configureRow: { row, indexPath in ... } /// Function from `RowType` to `UITableViewCell` ) "Building Fabric.app in Swift" - Javier Soto. April 2016 35

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Better with Swift "Building Fabric.app in Swift" - Javier Soto. April 2016 36

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Better with Swift 4 Nullability 4 Type-safe JSON parsing 4 Code generation "Building Fabric.app in Swift" - Javier Soto. April 2016 37

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Nullability "Building Fabric.app in Swift" - Javier Soto. April 2016 38

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Nullability final class ApplicationListViewController: BaseFabricTableViewController "Building Fabric.app in Swift" - Javier Soto. April 2016 40

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Nullability final class ApplicationListViewController: BaseFabricTableViewController { override viewDidLoad() { super.viewDidLoad() let session = UserSession.currentUserSession if let session = session session { session.requestApplications()... } // or... session!.requestApplications()... } "Building Fabric.app in Swift" - Javier Soto. April 2016 41

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Nullability final class ApplicationListViewController: BaseFabricTableViewController { init(viewModel: ApplicationListViewModel) } final class ApplicationListViewModel { init(fabricAPI: AuthenticatedFabricAPI) } public final class AuthenticatedFabricAPI { public init(authResponse: AuthResponse) } public final class AuthResponse { let accessToken: String } "Building Fabric.app in Swift" - Javier Soto. April 2016 42

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Nullability final class ApplicationListViewModel { var applications: [Application]? } "Building Fabric.app in Swift" - Javier Soto. April 2016 44

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Nullability enum DataLoadState { case Loading case Failed case Loaded(T) } final class ApplicationListViewModel { var applications: DataLoadState<[Application]> = .Loading } "Building Fabric.app in Swift" - Javier Soto. April 2016 45

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Type-safe JSON parsing "Building Fabric.app in Swift" - Javier Soto. April 2016 46

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JSON Parsing Anti-Patterns public struct Application { public var ID: String? public var name: String? public var bundleIdentifier: String? public mutating func decode(j: [String: AnyObject]) { self.ID = j["id"] as? String self.name = j["name"] as? String self.bundleIdentifier = j["identifier"] as? String } } "Building Fabric.app in Swift" - Javier Soto. April 2016 47

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JSON Parsing Anti-Patterns public struct Application { public let ID: String public let name: String public let bundleIdentifier: String public static func decode(j: [String: AnyObject]) -> Application? { guard let ID = j["id"] as? String, let name = j["name"] as? String, let bundleIdentifier = j["identifier"] as? String else { return nil } return Application( ID: ID, name: name, bundleIdentifier: bundleIdentifier ) } } "Building Fabric.app in Swift" - Javier Soto. April 2016 48

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Type-safe JSON parsing import Decodable /// https://github.com/Anviking/Decodable public struct Application: Decodable { public let ID: String public let name: String public let bundleIdentifier: String public static func decode(j: AnyObject) throws -> Application { return try Application( ID: j => "id", name: j => "name", bundleIdentifier: j => "identifier" ) } } "Building Fabric.app in Swift" - Javier Soto. April 2016 49

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Code Generation "Building Fabric.app in Swift" - Javier Soto. April 2016 50

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Code Generation /// Swift < 2.2 UIBarButtonItem(barButtonSystemItem: .Done, target: self, action: Selector("buttonTapped")) // Swift 2.2 UIBarButtonItem(barButtonSystemItem: .Done, target: self, action: #selector(ViewController.buttonTapped)) "Building Fabric.app in Swift" - Javier Soto. April 2016 51

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Code Generation super.init(nibName: "ViewControllerNibName", bundle: nil) let nib = UINib(nibName: "NibName", bundle: nil) tableView.registerNib(nib, forCellReuseIdentifier: "ReuseIdentifier") let cell = tableView.dequeueReusableCellWithIdentifier("ReuseIdentifier", forIndexPath: indexPath) as! MyTableViewCell let image = UIImage(named: "ImageName")! "Building Fabric.app in Swift" - Javier Soto. April 2016 52

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Code Generation: R.swift https://github.com/mac-cain13/R.swift "Building Fabric.app in Swift" - Javier Soto. April 2016 53

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Code Generation: R.swift https://github.com/mac-cain13/R.swift 4 Nibs 4 Reuse Identifiers 4 Image names in asset catalogs 4 Other file names in the bundle "Building Fabric.app in Swift" - Javier Soto. April 2016 54

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Code Generation: R.swift https://github.com/mac-cain13/R.swift super.init(nibResource: R.nib.myViewController) class MyTableViewCell: UITableViewCell, ReusableNibTableViewCell { /// This will even fail to compile if it's not the right cell static let nibResource = R.nib.myTableViewCell } tableView.registerReusableNibCell(MyTableViewCell) let cell = MyTableViewCell.dequeueFromTableView(tableView, indexPath) let image = R.image.imageName "Building Fabric.app in Swift" - Javier Soto. April 2016 55

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Error Reporting "Building Fabric.app in Swift" - Javier Soto. April 2016 56

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Error Reporting do { try fileManager.createDirectoryAtPath(path, withIntermediateDirectories: true, attributes: nil) /// ... } catch { print("Error: \(error)") } "Building Fabric.app in Swift" - Javier Soto. April 2016 57

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Error Reporting do { try fileManager.createDirectoryAtPath(path, withIntermediateDirectories: true, attributes: nil) /// ... } catch { Crashlytics.sharedInstance().recordError(error, withAdditionalUserInfo: userInfo) } "Building Fabric.app in Swift" - Javier Soto. April 2016 58

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Error Reporting "Building Fabric.app in Swift" - Javier Soto. April 2016 59

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Questions? 4 @Javi 4 javi@twitter.com 4 fabric-app-ios@twitter.com "Building Fabric.app in Swift" - Javier Soto. April 2016 60

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Thanks ! "Building Fabric.app in Swift" - Javier Soto. April 2016 61