Flying away from the nest (Bye Bye UIKit)

From the very beginning of your journey as iOS developer, UIKit is always there to help you. It helps you to walk your first steps, populate table views, handle notifications, create beautiful layouts and more. But as time goes by, you become more experienced and some day you realise that you have to leave the nest and become less dependent on UIKit. Let’s check how this turns out for you and see if we really need UIKit and iOS simulator to run and test our code.

Also known as "Short story about love"

Transcript

1. Flying away from the
   nest
   (Bye bye UIKit)
   @EliSawic
   

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2. About me
   Eliasz Sawicki
   Blog: www.eliaszsawicki.com
   Twitter: @EliSawic
   www.brightinventions.pl
   @EliSawic
   

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3. A short story about
   Love
   @EliSawic
   

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4. A short story about Love
   1. Friendship
   @EliSawic
   

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5. A short story about Love
   1. Friendship
   2. Love
   @EliSawic
   

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6. A short story about Love
   1. Friendship
   2. Love
   3. Doubt
   @EliSawic
   

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7. A short story about Love
   1. Friendship
   2. Love
   3. Doubt
   4. Betrayal
   @EliSawic
   

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8. A short story about Love
   1. Friendship
   2. Love
   3. Doubt
   4. Betrayal
   5. Starting over again
   @EliSawic
   

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9. A short story about Love
   1. Friendship
   2. Love
   3. Doubt
   4. Betrayal
   5. Starting over again
   6. Rebuild the trust
   @EliSawic
   

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10. How does it end?
    @EliSawic
    

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11. Friendship
    @EliSawic
    

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12. Objective-C
    @EliSawic
    

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13. The UIKit
    @EliSawic
    

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14. Why do we need
    UIKit?
    @EliSawic
    

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15. Love
    @EliSawic
    

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16. Swift
    @EliSawic
    

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17. Tests!
    @EliSawic
    

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18. Why do we need
    tests?
    @EliSawic
    

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19. Why cars need
    brakes?
    @EliSawic
    

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20. Test Driven
    Development
    @EliSawic
    

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21. Doubt
    @EliSawic
    

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22. Slow feedback loops
    @EliSawic
    

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23. Long build times
    @EliSawic
    

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24. No tests for you today
    @EliSawic
    

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25. Betrayal
    @EliSawic
    

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26. React-Native
    @EliSawic
    

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27. Testing feels natural
    @EliSawic
    

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28. Qucik reloading
    @EliSawic
    

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29. Starting over again
    @EliSawic
    

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30. What was the
    problem?
    @EliSawic
    

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31. Slow feedback loop
    @EliSawic
    

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32. Long build times
    @EliSawic
    

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33. Rebuild the trust
    @EliSawic
    

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34. MVC
    @EliSawic
    

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35. MVC
    @EliSawic
    

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36. MVVM
    @EliSawic
    

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37. MVVM
    @EliSawic
    

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38. Why would you
    remove UIKit?
    @EliSawic
    

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39. struct Person {
    var firstName: String
    var lastName: String
    var birthday: Date
    }
    @EliSawic
    

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40. class PersonView: UIView {
    private var person: Person
    private var dateFormatter = DateFormatter()
    init(person: Person) {
    self.person = person
    super.init(frame: .zero)
    setupView()
    }
    private func setupView() {
    dateFormatter.dateStyle = .short
    birthdayLabel.text = dateFormatter.string(from: person.birthday)
    titleLabel.text = person.firstName + person.lastName
    }
    func workButtonTapped() {
    // Some complicated logic
    }
    }
    @EliSawic
    

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41. protocol PersonViewModel {
    var title: String {get}
    var birthday: String {get}
    func doSomeWork()
    }
    class PersonView: UIView {
    private var viewModel: PersonViewModel
    init(viewModel: PersonViewModel) {
    self.viewModel = viewModel
    super.init(frame: .zero)
    setupView()
    }
    private func setupView() {
    titleLabel.text = viewModel.title
    birthdayLabel.text = viewModel.birthday
    }
    func workButtonTapped() {
    viewModel.doSomeWork()
    }
    }
    @EliSawic
    

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42. class DetailedPersonViewModel: PersonViewModel {
    var title: String
    var birthday: String
    var dateFormatter = DateFormatter()
    init(person: Person) {
    title = person.firstName + " " + person.lastName
    dateFormatter.dateStyle = .short
    birthday = dateFormatter.string(from: person.birthday)
    }
    func doSomeWork() {
    // Some complicated logic
    }
    }
    @EliSawic
    

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43. Dumb Views
    @EliSawic
    

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44. Logic
    @EliSawic
    

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45. Why are they still
    together?
    @EliSawic
    

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46. Multiple targets
    @EliSawic
    

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47. One for UIKit
    @EliSawic
    

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48. One for logic
    @EliSawic
    

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49. Two for Tests
    @EliSawic
    

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50. Better architecture
    @EliSawic
    

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51. Easier to maintain
    @EliSawic
    

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52. Speeded up tests
    @EliSawic
    

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53. Faster builds
    @EliSawic
    

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54. Can they be faster?
    @EliSawic
    

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55. Long time ago...
    @EliSawic
    

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56. Something went
    wrong
    @EliSawic
    

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57. Flow Controllers
    @EliSawic
    

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58. MVVM + FlowControllers
    @EliSawic
    

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59. Work on your flow
    @EliSawic
    

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60. Feel young again
    @EliSawic
    

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61. Code or didn't
    happen
    @EliSawic
    

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62. How does it end?
    @EliSawic
    

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63. It depends on you
    @EliSawic
    

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