責務範囲を意識するというお話

1. ੹຿ൣғΛҙࣝ͢Δͱ͍͏͓࿩ for Զίϯ
   7PM
   
   %BZ
   
2. override init() { super.init() emplyedBy = "YUMEMI Inc." job = "iOS Developer" twitter = "@lovee" qiita = "lovee" github = "el-hoshino" additionalInfo = "స৬͠·ͨ͠ʂ" class Speaker: Developer { } }
3. .PEFMɺ7JFX
   ͱ
   $POUSPMMFS
   Λ࡞Ε͹੹຿͕෼͚ΒΕͨͬ ͯ͜ͱʹͳΔΜͰ͔͢ʁ
4. .PEFMɺ7JFX
   ͱ
   $POUSPMMFS
   Λ࡞Ε͹੹຿ ͕෼͚ΒΕͨͬͯ͜ͱʹͳΔΜͰ͔͢ʁ ͦ͏ͱ͸ݶΒͳ͍
   ͦ΋ͦ΋ʮ࡞ͬͨʯͱ ʮਖ਼͘͠࡞ͬͨʯ͸
 ผ֓೦
5. ຊ౰ʹ੹຿෼͚ΒΕͯΔͷ͔ʁ class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() view.backgroundColor = UIColor(hue: 0.5, saturation: 1, brightness: 0.9, alpha: 1) } } $POUSPMMFS
   ͕ϏδϡΞϧΛ ௚઀ઃఆ͍ͯ͠Δ!
6. ઃܭͱͦΕΒͷ੹຿ʢ௒ͬ͘͟Γʣ ‣ .7$
   ‣ .PEFMɿϏδωεϩδοΫ
   ‣ 7JFXɿը໘ग़ྗ
   ‣ $POUSPMMFSɿϢʔβೖྗ
   ‣ .77.
   ‣ .PEFMɿϏδωεϩδοΫ
   ‣ 7JFXɿը໘ೖग़ྗ
   ‣ 7JFX.PEFMɿσʔλόΠϯσΟϯά
   ‣ FUD
7. ઃܭͱͦΕΒͷ੹຿ʢ௒ͬ͘͟Γʣ ‣ .7$
   ‣ 7JFXɿը໘ग़ྗ
   ‣ .77.
   ‣ 7JFXɿը໘ೖग़ྗ ۩ମతͳϏδϡΞϧදݱ͸
   7JFX
   ͷ໾ׂ
8. ຊ౰ʹ੹຿෼͚ΒΕͯΔͷ͔ʁ class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() view.backgroundColor = UIColor(hue: 0.5, saturation: 1, brightness: 0.9, alpha: 1) } } $POUSPMMFS
   ͕ϏδϡΞϧΛ ௚઀ઃఆ͍ͯ͠Δ!
9. ຊ౰͸͜͏͢΂͖͡Όͳ͍ͷ͔ʁ class ViewController: UIViewController { private lazy var _view = View() override func loadView() { self.view = _view } override func viewDidLoad() { super.viewDidLoad() _view.setupVisual() } } class View: UIView { func setupVisual() { self.backgroundColor = UIColor(hue: 0.5, saturation: 1, brightness: 0.9, alpha: 1) } } $POUSPMMFS
   ͕ϏδϡΞϧΛ ௚઀ઃఆ͍ͯ͠ͳ͍" ϏδϡΞϧͷઃఆ͸શͯ
 Ϗϡʔʹू໿͞ΕΔ
10. ੹຿Λҙࣝ͢Δͱݴ͏ͷ͸
 7JFX
    ΍
    .PEFM
    ͱͯ͠ͷ໾ׂΛ
 ҙࣝ͢Δ͜ͱ
11. ੹຿Λҙࣝ͢Δͱݴ͏ͷ͸
 7JFX
    ΍
    .PEFM
    ͱͯ͠ͷ໾ׂΛ
 ҙࣝ͢Δ͜ͱ ͚ͩͰ͸ͳ͍
12. https://qiita.com/lovee/items/555a5b76097347aa2367
13. ंͷΨεܽ໰୊
14. ंͷΨεܽ໰୊ class Person { var car: Car? func buyCar(_ car: Car) { self.car = car car.owner = self } } class Car { let model: String var owner: Person? init(_ model: String) { self.model = model } } let maki = Person() let ferrari458Italia = Car("458Italia") maki.buyCar(ferrari458Italia)
15. ंͷΨεܽ໰୊ Ψεܽ څ༉͠ʹߦ͘ څ༉
16. ंͷΨεܽ໰୊ class Person { var car: Car? func buyCar(_ car: Car) { self.car = car car.owner = self } } class Car { let model: String var owner: Person? init(_ model: String) { self.model = model } func outOfGasoline() { // ??? } } let maki = Person() let ferrari458Italia = Car("458Italia") maki.buyCar(ferrari458Italia) maki.car?.outOfGasoline() // ???
17. ंͷΨεܽ໰୊ Ψεܽ څ༉͠ʹߦ͘ څ༉ - ࠷دΓͷΨιϦϯελϯυ͕Ͳ͜ʹ͋ͬͯͲ͏ߦ͔͘ʁ
    - څ༉ελοϑʹͲ͏఻͑Δ͔ʁ
    - ࢧ෷͍͸Ͳ͏͢Δ͔ʁ
    - FUD ͜ΕΒͷ໰୊͸
 ॴ༗ऀ͕ղܾ͢Δ
 ඞཁ͕͋Δʂ
18. ंͷΨεܽ໰୊ class Person { var car: Car? func buyCar(_ car: Car) { self.car = car car.owner = self } func buyGasoline() { print("Buy some gasoline!") } } class Car { let model: String var owner: Person? init(_ model: String) { self.model = model } func outOfGasoline() { self.owner?.buyGasoline() } } let maki = Person() let ferrari458Italia = Car("458Italia") maki.buyCar(ferrari458Italia) maki.car?.outOfGasoline() // Buy some gasoline!
19. ंͷΨεܽ໰୊ Ψεܽ ॴ༗ऀʹ
 څ༉ͤ͞Δ څ༉͠ʹߦ͘ څ༉ څ༉͕
 ऴΘΔ Ψεܽղܾ - શͯͷॲཧ͸ं͕ߦͳ͍ͬͯΔ
    - ॴ༗ऀ͸ंʹ৐ͬऔΒΕͯ͠·͏
    - ͷͪͷ
    4LZOFU
    ໰୊ʢେӕʣ ͜ΕΒͷ໰୊͸
 ͋͘·Ͱॴ༗ऀࣗ਎͕
 ղܾ͢΂͖ʂ
20. ंͷΨεܽ໰୊ class Person { var car: Car? func buyCar(_ car: Car) { self.car = car car.owner = self } func buyGasoline() { print("Buy some gasoline!") } } extension Person: CarOwner { func carDidRunOutOfGasoline(_ car: Car) { self.buyGasoline() } } protocol CarOwner: class { func carDidRunOutOfGasoline(_ car: Car) } class Car { let model: String weak var owner: CarOwner? init(_ model: String) { self.model = model } func outOfGasoline() { self.owner? .carDidRunOutOfGasoline(self) } } let maki = Person() let ferrari458Italia = Car("458Italia") maki.buyCar(ferrari458Italia) maki.car?.outOfGasoline() // Buy some gasoline!
21. ंͷΨεܽ໰୊ Ψεܽ ॴ༗ऀʹ
 ஌ΒͤΔ څ༉͠ʹߦ͘ څ༉ څ༉͕
 ऴΘΔ Ψεܽղܾ - શͯͷॲཧ͸ॴ༗ऀ͕ߦͳ͍ͬͯΔ
    - ॴ༗ऀ͸ंʹ৐ͬऔΒΕͯ͠·Θͳ͍
    - ॴ༗ऀͷؾ࣋ͪͰങ͍׵͑Δ͜ͱ΋Մೳʂ
22. ंͷΨεܽ໰୊ Ψεܽ ॴ༗ऀʹ
 ஌ΒͤΔ σΟʔϥʔʹߦ͘ ങ͍׵͑Δ ৽͍͠ंΛೖख - શͯͷॲཧ͸ॴ༗ऀ͕ߦͳ͍ͬͯΔ
    - ॴ༗ऀ͸ंʹ৐ͬऔΒΕͯ͠·Θͳ͍
    - ॴ༗ऀͷؾ࣋ͪͰങ͍׵͑Δ͜ͱ΋Մೳʂ
23. ंͷΨεܽ໰୊ class Person { var car: Car? func buyCar(_ car: Car) { self.car = car car.owner = self } func buyGasoline() { print("Buy some gasoline!") } } extension Person: CarOwner { func carDidRunOutOfGasoline(_ car: Car) { self.buyCar(Car("488GTB")) } } protocol CarOwner: class { func carDidRunOutOfGasoline(_ car: Car) } class Car { let model: String weak var owner: CarOwner? init(_ model: String) { self.model = model } func outOfGasoline() { self.owner? .carDidRunOutOfGasoline(self) } } let maki = Person() let ferrari458Italia = Car("458Italia") maki.buyCar(ferrari458Italia) maki.car?.outOfGasoline() // Buy Ferrari 488 GTB!
24. ੹຿Λҙࣝ͢Δͱݴ͏ͷ͸
 ෦඼ͷॴ༗ؔ܎ʢ֊૚ؔ܎ʣΛ
 ҙࣝ͢Δ͜ͱͰ΋͋Δ
25. ंͷΨεܽ໰୊ class Person { var car: Car? func buyCar(_ car: Car) { self.car = car car.owner = self } func buyGasoline() { print("Buy some gasoline!") } } extension Person: CarOwner { func carDidRunOutOfGasoline(_ car: Car) { self.buyCar(Car("488GTB")) } } protocol CarOwner: class { func carDidRunOutOfGasoline(_ car: Car) } class Car { let model: String weak var owner: CarOwner? init(_ model: String) { self.model = model } func outOfGasoline() { self.owner? .carDidRunOutOfGasoline(self) } } let maki = Person() let ferrari458Italia = Car("458Italia") maki.buyCar(ferrari458Italia) maki.car?.outOfGasoline() // Buy Ferrari 488 GTB!
26. ඞཁ࠷খݶͷ͜ͱ͚ͩΛ஌Ζ͏ protocol CarOwner: class { func carDidRunOutOfGasoline(_ car: Car) } class Car { let model: String weak var owner: CarOwner? init(_ model: String) { self.model = model } func outOfGasoline() { self.owner? .carDidRunOutOfGasoline(self) } } - ं͕Φʔφʔͷߦಈʹ੹೚Λ࣋ͯ ͳ͍ʹ੹຿͕ͳ͍
    - ͔ͩΒΦʔφʔΛॴ༗ͯ͠͸ ͍͚ͳ͍
    - ͦΕͰΦʔφʔΛ௚઀ಈ͔͢ ͜ͱ΋Ͱ͖ͳ͍
    - Ͱ΋
    $BS0XOFS
    ͱͯ͠ಈ͚Δ ͜ͱ͸஌͍ͬͯΔ
    - ඞཁͳ࣌ʹΦʔφʔʹॲཧΛ ҠৡͰ͖Δ
27. ඞཁ࠷খݶͷ͜ͱ͚ͩΛ஌Ζ͏ protocol CarOwner: class { func carDidRunOutOfGasoline(_ car: Car) } class Car { let model: String weak var owner: CarOwner? init(_ model: String) { self.model = model } func outOfGasoline() { self.owner? .carDidRunOutOfGasoline(self) } } - ं͸ΦʔφʔΛॴ༗͍ͯ͠ͳ͍
    - ΦʔφʔΛऑࢀর͠ͳ͚Ε͹ͳΒͳ͍
    - ڧࢀর࢖͏͔ɺऑࢀর࢖͏͔ͷج४͸ɺ ͜ͷΦϒδΣΫτΛॴ༗͍ͯ͠Δ͔Ͳ͏͔
    - ॴ༗ؔ܎͸Ұํ௨ߦͳͷͰɺ॥؀ࢀর ͷ໰୊΋ճආͰ͖Δ
28. ඞཁ࠷খݶͷ͜ͱ͚ͩΛ஌Ζ͏ protocol CarOwner: class { func carDidRunOutOfGasoline(_ car: Car) } class Car { let model: String weak var owner: CarOwner? init(_ model: String) { self.model = model } func outOfGasoline() { self.owner? .carDidRunOutOfGasoline(self) } } - ໋໊িಥͷճආ
    - ΋͔͢͠Δͱಉ໊͡લͷผͷϝιου͕ ͋Δ͔΋͠Εͳ͍
    - Ҡৡݩ͸୭͔Λ൑ผͰ͖ΔΑ͏ʹ
    - Ҡৡઌ͕ಉ͡Ϋϥεͷෳ਺ΦϒδΣΫτ ࣋ͬͯΔ͔΋͠Εͳ͍
29. ඞཁ࠷খݶͷ͜ͱ͚ͩΛ஌Ζ͏ protocol CarOwner: class { func carDidRunOutOfGasoline(_ car: Car) } class Car { let model: String weak var owner: CarOwner? init(_ model: String) { self.model = model } func outOfGasoline() { self.owner? .carDidRunOutOfGasoline(self) } } - ࣗ෼ࣗ਎Λ๫࿐ͨ͘͠ͳ͍৔߹͸Ͳ͏͠Α͏#
    - ྫ͑͹Ҡৡઌ͸ࣗ෼ͷॴ༗ऀ͡Όͳ͍͔΋ ͠Εͳ͍৔߹
    - యܕతͳύλʔϯ͸
    7JFX
    ͷ
    %BUB4PVSDF
    - ͜͜Ͱ͸ंͷΨϨʔδΛྫʹ
30. ඞཁ࠷খݶͷ͜ͱ͚ͩΛ஌Ζ͏ protocol CarGarage: class { func carNeedsToPark(_ car: CarGarageUser) } protocol CarGarageUser: class { var garageUserModel: String { get } } class Car { let model: String weak var garage: CarGarage? // ... func parkToGarage() { self.garage?.carNeedsToPark(self) } } extension Car: CarGarageUser { var garageUserModel: String { return self.model } } ࣗ෼ࣗ਎Λ
    $BS
    ͷ୅ΘΓʹ
    $BS(BSBHF6TFS
    ͱͯ͠๫࿐ $BS(BSBHF
    ͕ඞཁͦ͏ͳ΋ͷ͚ͩΛ
    $BS(BSBHF6TFS
    ͱͯ͠ఏڙ
31. ੹຿Λҙࣝ͢Δͱݴ͏ͷ͸
 ඞཁ࠷খݶͷ৘ใΛ஌Γͳ͕Β
 ඞཁ࠷খݶͷ৘ใΛ๫࿐͢ΔͷΛ
 ҙࣝ͢Δ͜ͱͰ΋͋Δ
32. ·ͱΊ ‣ ੹຿ൣғΛҙࣝ͠Α͏ ‣ ෦඼ʢ7JFX
    ΍
    .PEFMʣͱͯ͠ͷ໾ׂΛҙࣝ͠Α͏
    ‣ ෦඼ͷॴ༗ؔ܎ʢ֊૚ؔ܎ʣΛҙࣝ͠Α͏
    ‣ ඞཁ࠷খݶͷ৘ใͷอ࣋ͱ΍ΓऔΓΛҙࣝ͠Α͏
33. ੹຿ൣғΛҙࣝͯ͠
 ࢓༷มߋʹڧ͍։ൃΛ
 "