1. Павел Гуров
pegurov@avito.ru
Application Coordinator
в iOS приложениях

2. 2
+

3. Application Coordinator
3

4. Application Coordinator
3
• Проблемы и их решение

5. Application Coordinator
3
• Проблемы и их решение
• Демо-проект

6. Application Coordinator
3
• Проблемы и их решение
• Демо-проект
• Внедрение в существующий код

7. 4

8. MVx
5

9. 6
UIStoryboard + segues

10. 6
UIStoryboard + segues
Containers

11. 6
UIStoryboard + segues
Containers
present(_:animated:completion:)

12. 7
UIStoryboard + segues
Containers
present(_:animated:completion:)

13. 7
self.performSegue(withIdentifier: "", sender: self)
self.navigationController
self.present(next, animated: true, completion: nil)
UIStoryboard + segues
Containers
present(_:animated:completion:)

14. 8
/*
// MARK: - Navigation
// In a storyboard-based application,
you will often want to do a little
preparation before navigation
override func prepare(
for segue: UIStoryboardSegue,
sender: Any?) {
// Get the new view controller using
// segue.destinationViewController.
// Pass the selected object to the
// new view controller.
}
*/

15. 8
/*
// MARK: - Navigation
// In a storyboard-based application,
you will often want to do a little
preparation before navigation
override func prepare(
for segue: UIStoryboardSegue,
sender: Any?) {
// Get the new view controller using
// segue.destinationViewController.
// Pass the selected object to the
// new view controller.
}
*/
/*
// MARK: - Navigation
// In a storyboard-based application,
you will often want to do a little
preparation before navigation
override func prepare(
for segue: UIStoryboardSegue,
sender: Any?) {
// Get the new view controller using
// segue.destinationViewController.
// Pass the selected object to the
// new view controller.
}
*/

16. 8
/*
// MARK: - Navigation
// In a storyboard-based application,
you will often want to do a little
preparation before navigation
override func prepare(
for segue: UIStoryboardSegue,
sender: Any?) {
// Get the new view controller using
// segue.destinationViewController.
// Pass the selected object to the
// new view controller.
}
*/
/*
// MARK: - Navigation
// In a storyboard-based application,
you will often want to do a little
preparation before navigation
override func prepare(
for segue: UIStoryboardSegue,
sender: Any?) {
// Get the new view controller using
// segue.destinationViewController.
// Pass the selected object to the
// new view controller.
}
*/

17. Жесткая связанность
9
1 2

18. Жесткая связанность
9
1 2

19. Жесткая связанность
9
1
2
3

20. Жесткая связанность
9
1
2
3

21. Порядок
10
1 2 3

22. Порядок
10
123

23. Передача данных
11
1 2 3

24. Передача данных
11
1 2 3

25. Передача данных
11
1 2 3

26. Выбор города
12

27. Выбор города
12

28. Выбор города
12

29. Выбор города
12

30. Выбор города
12

31. Выбор города
12

32. 13

33. 13

34. 13
self.navigationController
self.tabBarController

35. 13
performSegue(
withIdentifier: "next",
sender: self
)
prepare(
for segue: UIStoryboardSegue,
sender: Any?
)

36. 13
let next = CitiesViewController()
next.city = City(name: "Moscow")

37. 13

38. 14
Coordinator

39. 14
Coordinator

40. 14
Coordinator

41. 14
Coordinator

42. 14
Coordinator

43. 15
Coordinator

44. 15
Coordinator
Presentation
Logic
Data Database Storage

45. Demo
16

46. Inputs and outputs
17
class UserEditViewController: UIViewController {
// MARK: - Input -
var user: User? { didSet { updateView() } }
// MARK: - Output -
var onSelectCity: (() -> Void)?
}
class CitiesViewController: UITableViewController {
// MARK: - Output -
var onCitySelected: ((City) -> Void)?
}

47. Inputs and outputs
17
class UserEditViewController: UIViewController {
// MARK: - Input -
var user: User? { didSet { updateView() } }
// MARK: - Output -
var onSelectCity: (() -> Void)?
}
class CitiesViewController: UITableViewController {
// MARK: - Output -
var onCitySelected: ((City) -> Void)?
}

48. Inputs and outputs
17
class UserEditViewController: UIViewController {
// MARK: - Input -
var user: User? { didSet { updateView() } }
// MARK: - Output -
var onSelectCity: (() -> Void)?
}
class CitiesViewController: UITableViewController {
// MARK: - Output -
var onCitySelected: ((City) -> Void)?
}

49. 18

50. 18
“interface”
CitiesOutput
+ onCitySelected: (City)->()
protocol CitiesOutput {
var onCitySelected: ((City) -> Void)? {
get set
}
}

51. 18
“interface”
CitiesOutput
+ onCitySelected: (City)->()
CitiesViewController
protocol CitiesOutput {
var onCitySelected: ((City) -> Void)? {
get set
}
}
class CitiesViewController: CitiesOutput {
var onCitySelected: ((City) -> Void)?
}

52. 18
“interface”
CitiesOutput
+ onCitySelected: (City)->()
CitiesViewController
UserEditCoordinator
+ start()
+ controllerFactory: ControllerFactory
protocol CitiesOutput {
var onCitySelected: ((City) -> Void)? {
get set
}
}
class CitiesViewController: CitiesOutput {
var onCitySelected: ((City) -> Void)?
}

53. 18
“interface”
CitiesOutput
+ onCitySelected: (City)->()
CitiesViewController
UserEditCoordinator
+ start()
+ controllerFactory: ControllerFactory
ControllerFactory
+ cityOutput(): CitiesOutput
protocol CitiesOutput {
var onCitySelected: ((City) -> Void)? {
get set
}
}
class CitiesViewController: CitiesOutput {
var onCitySelected: ((City) -> Void)?
}

54. 18
“interface”
CitiesOutput
+ onCitySelected: (City)->()
CitiesViewController
UserEditCoordinator
+ start()
+ controllerFactory: ControllerFactory
ControllerFactory
+ cityOutput(): CitiesOutput
protocol CitiesOutput {
var onCitySelected: ((City) -> Void)? {
get set
}
}
class CitiesViewController: CitiesOutput {
var onCitySelected: ((City) -> Void)?
}

55. Composition VS Inheritance
19

56. Composition VS Inheritance
19
Coordinator
UINavigationController

57. Composition VS Inheritance
19
Coordinator
UINavigationController
Coordinator: UINavigationController

58. Storyboards
20

59. Storyboards
21
class BaseViewController: UIViewController {
var onPrepareForSegue: ((UIStoryboardSegue, Any?) -> ())?
override func prepare(for segue: UIStoryboardSegue,
sender: Any?) {
onPrepareForSegue?(segue, sender)
}
}

60. Storyboards
21
class BaseViewController: UIViewController {
var onPrepareForSegue: ((UIStoryboardSegue, Any?) -> ())?
override func prepare(for segue: UIStoryboardSegue,
sender: Any?) {
onPrepareForSegue?(segue, sender)
}
}

61. 22
class StoryboardCoordinator<RootType: UIViewController> {
let navigationController: UINavigationController
let rootViewController: RootType
init(storyboard: UIStoryboard) {
navigationController = storyboard.initialNavigation
rootViewController =
navigationController!.topViewController as! RootType
}
}
typealias UserEditCoordinator =
StoryboardCoordinator<UserEditViewController>

62. 22
class StoryboardCoordinator<RootType: UIViewController> {
let navigationController: UINavigationController
let rootViewController: RootType
init(storyboard: UIStoryboard) {
navigationController = storyboard.initialNavigation
rootViewController =
navigationController!.topViewController as! RootType
}
}
typealias UserEditCoordinator =
StoryboardCoordinator<UserEditViewController>

63. 22
class StoryboardCoordinator<RootType: UIViewController> {
let navigationController: UINavigationController
let rootViewController: RootType
init(storyboard: UIStoryboard) {
navigationController = storyboard.initialNavigation
rootViewController =
navigationController!.topViewController as! RootType
}
}
typealias UserEditCoordinator =
StoryboardCoordinator<UserEditViewController>

64. 22
class StoryboardCoordinator<RootType: UIViewController> {
let navigationController: UINavigationController
let rootViewController: RootType
init(storyboard: UIStoryboard) {
navigationController = storyboard.initialNavigation
rootViewController =
navigationController!.topViewController as! RootType
}
}
typealias UserEditCoordinator =
StoryboardCoordinator<UserEditViewController>

65. 23
Coordinator

66. 23
Coordinator

67. 23
Coordinator

68. 23
Coordinator

69. 23
Coordinator

70. Рефакторинг
существующего кода
24

71. 25

72. 25
LoginCoordinator
FeedCoordinator
UserEditCoordinator

73. 26
LoginCoordinator FeedCoordinator
UserEditCoordinator

74. 26
LoginCoordinator FeedCoordinator
UserEditCoordinator

75. 26
ApplicationCoordinator
LoginCoordinator FeedCoordinator
UserEditCoordinator
AppDelegate

76. 26
ApplicationCoordinator
LoginCoordinator FeedCoordinator
UserEditCoordinator
AppDelegate

77. 26
ApplicationCoordinator
LoginCoordinator FeedCoordinator
UserEditCoordinator
AppDelegate

78. 26
ApplicationCoordinator
LoginCoordinator FeedCoordinator
UserEditCoordinator
AppDelegate

79. 27
class ViewController: UIViewController {
var nextCoordinator: NextCoordinator?
@IBAction func someAction(_ sender: UIButton) {
nextCoordinator = NextCoordinator(
navVC: navigationController
)
nextCoordinator?.start()
}
}
Временный старт Coordinator
внутри UIViewController

80. Итог
28

81. Итог
• Независимые экраны и сценарии
28

82. Итог
• Независимые экраны и сценарии
• Легко менять порядок
28

83. Итог
• Независимые экраны и сценарии
• Легко менять порядок
• Упрощается передача данных между экранами
28

84. Итог
• Независимые экраны и сценарии
• Легко менять порядок
• Упрощается передача данных между экранами
• Никаких сторонних зависимостей =)
28

85. Итог
• Независимые экраны и сценарии
• Легко менять порядок
• Упрощается передача данных между экранами
• Никаких сторонних зависимостей =)
28
github.com/pegurov/CoordinatorsDemo
pegurov@avito.ru