R.swift - Statically typed resources for iOS

Mathijs Kadijk presents R.swift at the September 2016 CocoaHeadsNL meetup. R.swift provides statically typed, autocompleted resources like images, fonts and segues in Swift projects.

Video of this presentation can be found at https://vimeo.com/185173151

Transcript

1. R.swift R for iOS
2. Mathijs Kadijk
3. R.swift !
4. Strong typed, autocompleted resources in Swift projects
5. "Do I need that?" !
6. I ! Swift
7. So many typechecks! !
8. If it compiles it works! !
9. Example enum Language: String { case nl = "nl" case en = "en" }
10. Example enum Creator { case person(String) case system }
11. If it compiles it works! !
12. So I wrote some more code ✍
13. So I wrote some more code: let icon = UIImage(named: "settings-icon") let title = NSLocalizedString("title", tableName: "Generic", comment: "") let storyboard = UIStoryboard(name: "Main", bundle: nil) let vc = storyboard .instantiateViewController(withIdentifier: "Setings") as? SettingsController vc.initialSettingsUrl = Bundle.main .url(forResource: "seed-data", withExtension: "json")
14. ! Terminating app due to uncaught exception 'NSInvalidArgumentException'
15. Crash by typo: .instantiateViewController(withIdentifier: "Setings") "Setings" → "Settings"
16. Lets refactor! !
17. No compile time checks let icon = UIImage(named: "small-gear") let title = NSLocalizedString("title", tableName: "Settings", comment: "") let storyboard = UIStoryboard(name: "Settings", bundle: nil) let vc = storyboard .instantiateInitialViewController() as? SettingsController vc.initialSettingsUrl = Bundle.main .url(forResource: "initial-settings", withExtension: "json")
18. On Android?
19. 'R' contains all resources · R.drawable.settingsIcon · R.string.settingsTitle · R.id.settingsButton
20. 'R' resources · Automatically generated · Compile time checked · Autocompleted
21. I want that on iOS!
22. R.swift http://git.io/rswift
23. Converting to R.swift
24. Converting to R.swift: let icon = UIImage(named: "small-gear") let title = NSLocalizedString("title", tableName: "Settings", comment: "") let storyboard = UIStoryboard(name: "Settings", bundle: nil) let vc = storyboard .instantiateInitialViewController() as? SettingsController vc.initialSettingsUrl = Bundle.main .url(forResource: "initial-settings", withExtension: "json")
25. Converting to R.swift: let icon = R.image.smallGear() let title = NSLocalizedString("title", tableName: "Settings", comment: "") let storyboard = UIStoryboard(name: "Settings", bundle: nil) let vc = storyboard .instantiateInitialViewController() as? SettingsController vc.initialSettingsUrl = Bundle.main .url(forResource: "initial-settings", withExtension: "json")
26. Converting to R.swift: let icon = R.image.smallGear() let title = R.string.settings.title() let storyboard = UIStoryboard(name: "Settings", bundle: nil) let vc = storyboard .instantiateInitialViewController() as? SettingsController vc.initialSettingsUrl = Bundle.main .url(forResource: "initial-settings", withExtension: "json")
27. Converting to R.swift: let icon = R.image.smallGear() let title = R.string.settings.title() let vc = R.storyboard.settings.initialViewController() vc.initialSettingsUrl = Bundle.main .url(forResource: "initial-settings", withExtension: "json")
28. Converting to R.swift: let icon = R.image.smallGear() let title = R.string.settings.title() let vc = R.storyboard.settings.initialViewController() vc.initialSettingsUrl = R.file.initialSettingsJson()
29. Demo!
30. Benefits: · Fully typed · Compile time checked · Autocompleted
31. Wide range of resources: · Images · Custom fonts · Resource files · Reusable cells · Localized strings · Storyboards, segues & nibs
32. Principles · Never crash · Always compile · Clarity over brevity
33. Installation? Cocoapods or manual
34. Alternatives: · SwiftGen · Natalie · Rdotm
35. Main difference?
36. R.swift looks at your project file!
37. R.swift just works
38. Image literals? !
39. R.swift http://git.io/rswift