20180220_iOSLT_Swiftとオブジェクト間の通知のパターン

Transcript

1. SwiftͱΦϒδΣΫτؒͷ௨஌ͷύλʔϯ
   2018/2/20 @shtnkgm
   

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2. ࿩͢͜ͱ
   SwiftͱΦϒδΣΫτؒͷ௨஌ͷύλʔϯʹ͍ͭͯߟ͑·͢
   1. ௨஌ํ๏ͷઃܭʹ͍ͭͯ
   2. ΞϯνύλʔϯΛؚΊͨҎԼͷ5ͭͷ௨஌ύλʔϯ
   3. ύλʔϯͷൺֱͱ࢖͍෼͚ʹ͍ͭͯ
   

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3. ௨஌ͱ͸
   ΦϒδΣΫτؒͷʮ௨஌ʯͱ͸ΦϒδΣΫτؒͷϝοηʔδͷ΍
   ΓͱΓΛҙຯ͠·͢ɻ
   

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4. ͳͥ௨஌ํ๏ͷઃܭ͕ඞཁ͔
   • ৑௕ͳίʔυͷഉআɺ࠶ར༻ੑ޲্͍ͤͨ͞
   • ίʔυΛ੹຿ʹԠͯ͡ෳ਺ͷΦϒδΣΫτ΁෼ׂ͍ͨ͠
   • ෳ਺ͷΦϒδΣΫτΛѻ͏ͨΊɺͦͷ௨஌ํ๏ͷઃܭ͕ඞཁ
   

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5. ྫ୊ɿViewͱModel
   Modelͷσʔλߋ৽ͷ׬ྃΛView΁ͲͷΑ͏ʹ௨஌͢Δʁ
   ※Prensenter΍ViewModelͳͲΞʔΩςΫνϟͷ࿩͸͜͜Ͱ͸ߟ͑ͳ͍΋ͷͱ͠·͢ɻ
   

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6. 5ͭͷ௨஌ύλʔϯ
   1. ॥؀ࢀরύλʔϯʢΞϯνύλʔϯʣ
   2. Delegateύλʔϯʢऑࢀর+ϙϦϞʔϑΟζϜʣ
   3. NotificationCenterύλʔϯ
   4. KVOύλʔϯʢKey-Value Observing: Ωʔ஋؂ࢹʣ
   5. Closure Callbackύλʔϯ
   ※SwiftͰඪ४αϙʔτ͞Ε͍ͯͳ͍ɺRxSwift΍BondͳͲͷσʔλόΠϯσΟϯάύλʔϯ͸ର৅֎
   

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7. 5ͭͷ௨஌ύλʔϯ
   1. ॥؀ࢀরύλʔϯʢΞϯνύλʔϯʣ
   2. Delegateύλʔϯʢऑࢀর+ϙϦϞʔϑΟζϜʣ
   3. NotificationCenterύλʔϯ
   4. KVOύλʔϯʢKey-Value Observing: Ωʔ஋؂ࢹʣ
   5. Closure Callbackύλʔϯ
   

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8. 1. ॥؀ࢀরύλʔϯʢΞϯνύλʔϯʣ
   • ผΦϒδΣΫτͷϝιουΛ࣮ߦ͢Δʹ͸ɺͦͷΦϒδΣΫτ
   ͷࢀরΛ͍࣋ͬͯΕ͹ྑ͍
   • ͭ·ΓΦϒδΣΫτؒͰ૬ޓʹ௨஌Λ͢Δʹ͸͓ޓ͍ͷࢀরΛ
   ͍࣋ͬͯΕ͹ྑ͍
   

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9. class View {
   // ˒ ModelΦϒδΣΫτ΁ͷࢀর
   var model: Model = Model()
   func receiveUIEvent() {
   // ModelͷviewϓϩύςΟʹࣗ਎Ληοτ
   model.view = self
   // 2. σʔλͷߋ৽ΛModelʹ௨஌
   model.updateData()
   }
   // 5. UIͷߋ৽
   func updateUI() {
   print("\(model.data)")
   }
   }
   

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10. class Model {
    // ˒ ViewΦϒδΣΫτ΁ͷࢀর
    var view: View?
    var data: Int = 0
    // 3. σʔλͷߋ৽
    func updateData() {
    data += 1
    // 4. View΁σʔλͷߋ৽׬ྃΛ௨஌
    view?.updateUI()
    }
    }
    

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11. ͜ͷίʔυ͸ಈ͚͘Ͳ...
    

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12. ॥؀ࢀর໰୊͕͋Δ
    • ਖ਼ৗʹಈ࡞͢Δ͕ɺʮ॥؀ࢀরʯ(strong reference cycle)ͱ͍
    ͏໰୊͋Γ
    • ࢀরؔ܎͕॥؀͍ͯ͠Δ৔߹ɺΦϒδΣΫτ͸ϝϞϦ͔Βղ์
    ͞Εͳ͍ʢ=ϝϞϦϦʔΫʣ
    • ϝϞϦϦʔΫ͕૿͑ΔͱύϑΥʔϚϯε͕མͪɺ࠷ѱΞϓϦ͕
    Ϋϥογϡ͢Δ
    

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13. ิ଍: iOSͷϝϞϦ؅ཧํࣜʹ͍ͭͯʢ1/2ʣ
    • iOSͰ͸ϝϞϦ؅ཧΛࢀরΧ΢ϯλ(Reference Counting)ͱ͍͏
    ํࣜͰߦ͍ͬͯΔ
    • ࢀর͞ΕΔ͝ͱʹ+1ɺࢀর͕ͳ͘ͳͬͨ࣌఺Ͱ-1
    

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14. ิ଍: iOSͷϝϞϦ؅ཧํࣜʹ͍ͭͯʢ2/2ʣ
    • ࢀরΦϒδΣΫτ͕ͳ͍৔߹ɺࢀরΧ΢ϯλ͕0ʹͳΔ
    • OS͸ͦͷΦϒδΣΫτΛϝϞϦ͔Β։์ͯ͠΋ྑ͍ͱ൑அ
    

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15. ॥؀ࢀরύλʔϯΛվળ͍ͨ͠
    

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16. 5ͭͷ௨஌ύλʔϯ
    1. ॥؀ࢀরύλʔϯʢΞϯνύλʔϯʣ
    2. Delegateύλʔϯʢऑࢀর+ϙϦϞʔϑΟζϜʣ
    3. NotificationCenterύλʔϯ
    4. KVOύλʔϯʢKey-Value Observing: Ωʔ஋؂ࢹʣ
    5. Closure Callbackύλʔϯ
    

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17. 2. Delegateύλʔϯʢऑࢀর+ϙϦϞʔϑΟζϜʣ
    • weakΩʔϫʔυΛ͚ͭΔ͜ͱͰɺʮऑࢀরʯʢweak
    referenceʣ͢Δ
    • ௨ৗͷʮڧࢀরʯͱҟͳΓɺࢀরΧ΢ϯλ͕૿͑ͳ͍
    

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18. ऑࢀরͷϓϩύςΟͰ͸ࢀরઌͷΦϒδΣΫτ͕ղ์͞Εɺnil͕
    ୅ೖ͞ΕΔՄೳੑ͕͋ΔͨΊɺΦϓγϣφϧܕͰఆٛ
    // weakΩʔϫʔυͰऑࢀর
    weak var view: View?
    

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19. ॥؀ࢀর໰୊͸ղܾͨ͠
    

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20. ·ͩվྑͷ༨஍͋Γ
    • ViewͱModel͕ʮີ݁߹ʯ(tight coupling)Ͱ͋Δ
    • ີ݁߹ͳઃܭ͸มߋʹऑ͘ɺ࠶ར༻΋ͮ͠Β͍
    • ͜͜Ͱݴ͏มߋʹऑ͍ͱ͍͏ͷ͸ɺ࢓༷มߋ͕ೖͬͨ৔߹ʹม
    ߋՕॴ͕ଟ͘ͳΔͱ͍͏ҙຯ
    

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21. SecondView͕ModelΛ࢖͏࢓༷มߋΛ૝ఆ
    class Model {
    // View → SecondViewʹมߋ͕ඞཁʢModel͸Viewʹґଘ͍ͯ͠Δʣ
    weak var view: View?
    var data: Int = 0
    func updateData() {
    data += 1
    view?.updateUI()
    }
    }
    

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22. ີ݁߹໰୊ͷղܾ
    • Model͕Viewʹґଘ͠ͳ͍ॻ͖ํʹ͢Δ
    • ΑΓந৅తͳΠϯλϑΣʔεʹґଘͤ͞ΔΑ͏ʹ͢Δ
    • Model͕ඞཁͱ͢Δந৅తͳΠϯλϑΣʔεͱ͸Կ͔
    

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23. ந৅తͳΠϯλϑΣʔε
    • ʮupdateUIϝιου͕࣮ߦͰ͖Δ͜ͱʯͷΈ
    • updateUIϝιου͕࣮ߦͰ͖ΔΫϥεͰ͋Ε͹ͲΜͳΫϥεͰ
    ΋ྑ͍
    • ͜ͷந৅తͳΠϯλϑΣʔεΛද͢ํ๏ͷ1ͭͱͯ͠ɺSwiftͰ
    ͸ϓϩτίϧ͕͋Δ
    ʢJavaʹ͓͚Δinterfaceʹ͍ۙ֓೦ʣ
    

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24. updateUIϝιουΛ࣋ͭͱ͍͏֓೦ΛϓϩτίϧͰ࣮૷
    // ViewProtocolʹ४ڌ͢Δܕ͸updateUI()ͱ͍͏ϝιουΛ࣋ͭ
    protocol ViewProtocol {
    func updateUI()
    }
    

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25. ϓϩτίϧ͕ܕͱͯ͠ѻ͑Δ
    • ΠϯελϯεԽ͸Ͱ͖ͳ͍͕ɺܕͱͯ͠ѻ͑Δ
    protocol ViewProtocol: class {
    func updateUI()
    }
    class Model {
    // ViewͰͳ͘ViewProtocolʹґଘ
    weak var view: ViewProtocol?
    var data: Int = 0
    func updateData() {
    data += 1
    view?.updateUI()
    }
    }
    

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26. ۩৅ΫϥεΛϓϩτίϧʹ४ڌͤ͞Δ
    // ViewProtocolʹ४ڌ͢Δ͜ͱΛએݴ
    class View: ViewProtocol {
    var model: Model = Model()
    func receiveUIEvent() {
    model.view = self
    model.updateData()
    }
    // ViewProtocolʹ४ڌͨ͠ϝιου
    func updateUI() {
    print("\(model.data)")
    }
    }
    

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27. ิ଍: Class-Only Protocols
    protocol ViewProtocol: class {
    func updateUI()
    }
    ্هͷίʔυྫͰ͸ɺViewProtocol͸classΛܧঝ͍ͤͯ͞·͢ɻ
    classΛܧঝ͢Δͱɺͦͷϓϩτίϧ͸Ϋϥεʹ͔͠ద༻Ͱ͖ͳ͘
    ͳΓ·͢ɻ
    

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28. ͳͥclassܧঝ͕ඞཁ͔
    • ModelͷviewϓϩύςΟ͸weakʢऑࢀরʣͰఆٛ͞Ε͍ͯΔͨ
    ΊɺΫϥεʢࢀরܕʣͰ͋Δඞཁ͋Γ
    ʢߏ଄ମ΍ྻڍମ͸஋ܕͰ͋ΔͨΊNGʣ
    • ViewProtocol͕ΫϥεʢࢀরܕʣͰ͋Δ͜ͱΛ໌ࣔ͢ΔͨΊʹ
    classΛܧঝ͢Δ
    class Model {
    // weak͕͍͍ͭͯΔͷͰViewProtocol͸ࢀরܕͰ͋Δඞཁ͕͋Δ
    weak var view: ViewProtocol?
    

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29. ґଘؔ܎ΛղফͰ͖ͨ
    • ͜ΕͰModel͕Viewʹґଘ͠ͳ͍ίʔυʹͳͬͨ
    • ͜Ε͸ʮϙϦϞʔϑΟζϜʯͷҰྫʹ΋ͳ͍ͬͯΔ
    ʢϓϩτίϧ͕ϙϦϞʔϑΟζϜͷ࣮ݱखஈͷͻͱͭʣ
    

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30. ϙϦϞʔϑΟζϜʢpolymorphism: ଟଶੑʣ
    ಈతʹϝιουʹΑͬͯݺͼग़͞ΕΔΦϒδΣΫτ͕มΘΓɺͦ
    ͷΦϒδΣΫτʹΑͬͯৼΔ෣͍͕มΘΔͱ͍͏ੑ࣭
    

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31. ࠓճͷྫͱϙϦϞʔϑΟζϜ
    • Model͸viewϓϩύςΟʹର͠updateUIϝιουΛ࣮ߦ
    • viewϓϩύςΟ͕Viewͳͷ͔SecondViewͳͷ͔͸஌Βͳ͍
    ʢviewϓϩύςΟ͕ෳ਺ͷܕʹͳΓ͏Δ:ϙϦϞʔϑΟζϜʣ
    • ࣮ߦΦϒδΣΫτʹΑͬͯupdateUIϝιουͷ࣮૷͕ҟͳΔ
    ʢViewΛߋ৽ or SecondViewΛߋ৽ʣ
    

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32. UIKitͱσϦήʔτύλʔϯ
    • UIKitϑϨʔϜϫʔΫͰ͸UITableViewDelegateɺ
    UIPickerViewDelegateͳͲ਺ଟ͘ͷΦϒδΣΫτͰ͜ͷύλʔ
    ϯΛ࠾༻
    • σϦήʔτύλʔϯʹ͓͚ΔϙϦϞʔϑΟζϜͷੑ࣭Λ׆͔͢
    ͜ͱͰɺ࠶ར༻ੑͷߴ͍UI෦඼Λఏڙ
    

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33. ϝϦσϝ
    • !ϓϩτίϧʹΑΓ࣮૷͢΂͖ϝιου͕໌֬
    • "௨৴׬ྃͷ௨஌ͷΈͳͲɺγϯϓϧͳ௨஌ͷ৔߹ʹ͸هड़ί
    ετͱݟ߹Θͳ͍
    (σϦήʔτϓϩύςΟͷ࣮૷ɺϓϩτίϧఆٛɺϓϩτίϧ΁
    ͷ४ڌ)
    • "Մಡੑ͕ൺֱత௿͍
    

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34. 5ͭͷ௨஌ύλʔϯ
    1. ॥؀ࢀরύλʔϯʢΞϯνύλʔϯʣ
    2. Delegateύλʔϯʢऑࢀর+ϙϦϞʔϑΟζϜʣ
    3. NotificationCenterύλʔϯ
    4. KVOύλʔϯʢKey-Value Observing: Ωʔ஋؂ࢹʣ
    5. Closure Callbackύλʔϯ
    

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35. 3. NotificationCenterύλʔϯ
    • NotificationCenterΫϥεΛར༻ͨ͠௨஌ͷύλʔϯ
    • NotificationCenter͸ड৴ొ࿥ͨ͠ΦϒδΣΫτʹର͠৘ใΛϒ
    ϩʔυΩϟετ͢Δ
    • ௨஌ΠϯλϑΣʔε͸௨஌໊ʢจࣈྻʣͷΈ
    • ಉ͡௨஌໊ΛผͷΦϒδΣΫτ͔Β΋ૹ৴Ͱ͖ΔͨΊɺଟରଟ
    ͷ௨஌Λ࣮ݱ
    

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36. NotificationCenterͷTips
    ௨஌໊͸Notification.NameΛextensionͰ֦ு͠ɺstaticϓϩύς
    ΟͰఆ͓ٛͯ͘͠ͱར༻͠΍͍͢
    // ௨஌໊Λొ࿥
    extension Notification.Name {
    static let updateDataNotification = Notification.Name("updateDataNotification")
    }
    

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37. ड৴ొ࿥ / ૹ৴ͷ࢓ํ
    //ɹ௨஌ͷड৴ొ࿥ʢupdateDataNotificationͷ௨஌Λड৴ͨ͠ΒɺupdateUIϝιουΛ࣮ߦʣ
    NotificationCenter.default.addObserver(self,
    selector: #selector(updateUI),
    name: .updateDataNotification,
    object: nil)
    // ௨஌ͷૹ৴ʢupdateDataNotificationͷ௨஌Λૹ৴ʣ
    NotificationCenter.default.post(name: .updateDataNotification,
    object: nil)
    

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38. Model͔ΒView΁௨஌͢Δྫ
    class View {
    var model: Model = Model()
    init() {
    // ௨஌ͷड৴ొ࿥ʢupdateDataNotificationͷ௨஌Λड৴ͨ͠ΒɺupdateUIϝιουΛ࣮ߦʣ
    NotificationCenter.default.addObserver(self,
    selector: #selector(updateUI),
    name: .updateDataNotification,
    object: nil)
    }
    func receiveUIEvent() {
    model.updateData()
    }
    @objc func updateUI() {
    print("\(model.data)")
    }
    }
    

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39. class Model {
    var data: Int = 0
    func updateData() {
    data += 1
    // ௨஌ͷૹ৴ʢupdateDataNotificationͷ௨஌Λૹ৴ʣ
    NotificationCenter.default.post(name: .updateDataNotification,
    object: nil)
    }
    }
    

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40. ௨஌ͷड৴ղআʹ͍ͭͯʢremoveObserverʣ
    • ௨஌ͷड৴ղআΛద੾ʹߦΘͳ͍ͱ։์͞ΕͨΦϒδΣΫτʹ
    ௨஌Λૹͬͯ͠·͏ʢ࣮ߦ࣌Ϋϥογϡʣ
    • iOS9Ҏ߱Ͱ͸deinit࣌ʹࣗಈͰ࣮ߦ
    // deinitͰͷड৴ղআ͸ෆཁ
    deinit {
    NotificationCenter.default.removeObserver(self, name: .updateDataNotification, object: nil)
    }
    

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41. ิ଍:SelectorͰͷϝιου࣮ߦʹ͍ͭͯ
    Selector͸࣮ߦ࣌ʹݺͼग़͢ϝιου͕ܾఆ͢ΔɺObjective-Cํ
    ࣜͷಈతͳݺͼग़͠Λߦ͏ͨΊɺupdateUIϝιουʹ͸@objcଐੑ
    Λ͚ͭΔ
    @objc func updateUI() {
    print("\(model.data)")
    }
    

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42. ϝϦσϝ
    • !௨஌໊Ͱ؆୯ʹ௨஌Λ࣮૷Ͱ͖Δʢ௨஌จࣈྻͷΈ͕Πϯλ
    ϑΣʔεͰૄ݁߹ʣ
    • !NରNͷ௨஌͕ඞཁͳ৔߹΍௨஌͍ͨ͠ΦϒδΣΫτؒʹ௚઀
    ͷࢀরؔ܎͕ͳ͍৔߹ʹ༗ޮ
    • "ଟ༻͢ΔͱॲཧͷྲྀΕ͕௥͍ͮΒ͍ʢεύήοςΟϓϩάϥ
    ϜʹͳΔՄೳੑʣ
    

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43. 5ͭͷ௨஌ύλʔϯ
    1. ॥؀ࢀরύλʔϯʢΞϯνύλʔϯʣ
    2. Delegateύλʔϯʢऑࢀর+ϙϦϞʔϑΟζϜʣ
    3. NotificationCenterύλʔϯ
    4. KVOύλʔϯʢKey-Value Observing: Ωʔ஋؂ࢹʣ
    5. Closure Callbackύλʔϯ
    

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44. 4. KVOύλʔϯʢKey-Value Observing: Ωʔ஋؂ࢹʣ
    • KVO͸ϓϩύςΟ஋ͷมԽΛ؂ࢹ͢Δ࢓૊Έ
    • Objective-CͷϥϯλΠϜػೳΛར༻͍ͯ͠ΔͨΊɺ؂ࢹର৅ͷ
    ΦϒδΣΫτ͸NSObjectΛཁܧঝ
    • Swift4Ͱ͸ɺϓϩύςΟมߋ࣌ͷॲཧΛΫϩʔδϟʔͰॻ͚Δ
    Α͏ʹͳΓɺΑΓ࢖͍΍͍͢
    

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45. class View {
    var model: Model = Model()
    // ؂ࢹ༻ΦϒδΣΫτΛอ࣋͢Δ
    var observation: NSKeyValueObservation?
    init() {
    // modelͷdataϓϩύςΟΛKVOͰ؂ࢹ͢Δ
    observation = model.observe(\.data, options: [.new]) { model, change in
    // model.data͕มԽͨ͠৔߹ʹ࣮ߦ͞ΕΔΫϩʔδϟʔ
    if let newValue = change.newValue {
    print(newValue)
    }
    }
    }
    func receiveUIEvent() {
    model.updateData()
    }
    }
    

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46. // NSObjectΛܧঝ
    class Model: NSObject {
    // @objcͱdynamicΛ͚ͭΔ
    @objc dynamic var data: Int = 0
    func updateData() {
    data += 1
    }
    }
    

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47. ิ଍:dynamicΩʔϫʔυ
    • KVO͸Objective-CͷϥϯλΠϜػೳͰ͋ΔಈతσΟεύον
    ʢdynamic dispatchʣΛར༻
    ʢ࣮ߦ࣌ʹಈతʹϓϩύςΟ͕ܾఆ͞ΕΔʣ
    • ΑͬͯϓϩύςΟʹ͸@objcͱdynamic͕ඞཁ
    @objc dynamic var data: Int = 0
    

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48. ϝϦσϝ
    • !WebKitͷWKWebViewͷϓϩύςΟͷதʹ͸ɺtitle΍urlɺ
    estimatedProgressͳͲɺKVOʹରԠͨ͠ϓϩύςΟ(key-value
    observing compliant)͕͋ΓɺKVOͱ૬ੑ͕ྑ͍
    • "ߏ଄ମʢstructʣ͸NSObjectΛܧঝ͢Δ͜ͱ͕Ͱ͖ͳ͍ͨ
    ΊɺKVO͸ར༻Ͱ͖ͳ͍
    

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49. 5ͭͷ௨஌ύλʔϯ
    1. ॥؀ࢀরύλʔϯʢΞϯνύλʔϯʣ
    2. Delegateύλʔϯʢऑࢀর+ϙϦϞʔϑΟζϜʣ
    3. NotificationCenterύλʔϯ
    4. KVOύλʔϯʢKey-Value Observing: Ωʔ஋؂ࢹʣ
    5. Closure Callbackύλʔϯ
    

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50. 5. Closure Callbackύλʔϯ
    ׬ྃޙͷॲཧΛΫϩʔδϟʔͰड͚औΓɺͦͷίʔϧόοΫ༻ͷ
    ΫϩʔδϟʔΛ࣮ߦ͢Δ͜ͱͰ௨஌͢Δύλʔϯ
    

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51. Ϋϩʔδϟʔ͸ؔ਺ͷΦϒδΣΫτ
    // Ϋϩʔδϟʔͷྫ
    let isEqual: (_ a: Int, _ b: Int) -> Bool = { a, b in
    return a == b
    }
    // ()Ͱ࣮ߦ
    isEqual(1, 1) // true
    isEqual(1, 2) // false
    

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52. class View {
    var model: Model = Model()
    func receiveUIEvent() {
    // ׬ྃޙͷॲཧΛΫϩʔδϟʔͰࢦఆ͢Δ
    // ຤ඌͷΫϩʔδϟʔͷҾ਺໊͸লུͰ͖Δʢtrailing closureه๏ʣ
    model.updateData { data in
    print(data)
    }
    }
    }
    

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53. class Model {
    var data: Int = 0
    // ׬ྃޙͷॲཧΛҾ਺ͷΫϩʔδϟʔͰड͚औ࣮ͬͯߦ͢Δ
    func updateData(completion: (_ data: Int) -> Void) {
    data += 1
    completion(data)
    }
    }
    

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54. ϝϦσϝ
    • !ݺͼग़͠ϝιουͷۙ͘ʹ׬ྃ࣌ͷॲཧΛॻ͚ΔͨΊɺίʔ
    υΛ௥͍΍͍͢
    • "ͨͩ͠ෳ਺ͷඇಉظॲཧΛஞ࣮࣍ߦ͢Δ৔߹͸ɺΫϩʔδϟ
    ʔͷωετ͕ਂ͘ͳΒͳ͍Α͏ʹ஫ҙ
    func receiveUIEvent() {
    model.updateData(completion: { data in
    model.updateData(completion: { data in
    model.updateData(completion: { data in
    print(data)
    })
    })
    })
    }
    

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55. UIKitͰͷར༻
    ྫ͑͹UIAlertControllerͷUIAlertAction͸μΠΞϩάλοϓ࣌ͷॲ
    ཧΛΫϩʔδϟʔͰࢦఆ
    let alertAction = UIAlertAction(title: "OK",
    style: .default) { handler in
    // OKϘλϯλοϓ࣌ͷॲཧ
    print("OK͕λοϓ͞Ε·ͨ͠")
    }
    

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56. ௨஌ύλʔϯͷൺֱͱ࢖͍෼͚
    • ௨஌ͷύλʔϯ͸͜Ε͕Ұ൪ྑ͍ͱ͍͏΋ͷ͸ͳ͍
    • ༻్ʹԠͯ͡ద੾ʹ௨஌ͷύλʔϯΛબ୒
    • ·ͣ͸௨஌ݩͱ௨஌ઌͷ਺ͷؔ܎ʹԠͯ͡௨஌ͷύλʔϯΛબ
    ୒
    

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57. ·ͱΊ
    1. ॥؀ࢀরύλʔϯʢΞϯνύλʔϯʣ
    2. Delegateύλʔϯʢऑࢀর+ϙϦϞʔϑΟζϜʣ
    3. NotificationCenterύλʔϯ
    4. KVOύλʔϯʢKey-Value Observing: Ωʔ஋؂ࢹʣ
    5. Closure Callbackύλʔϯ
    

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58. ௨஌ͷύλʔϯ ௨஌ݩͱ௨஌ઌͷ਺ ϝϦοτ σϝϦοτ
    Delegate 1ɿ1 ϓϩτίϧʹΑΓ࣮૷͢΂͖
    ௨஌ΠϯλϑΣʔε͕໌֬ɻ
    ௨஌͢Δϝιου͕1ͭͷ৔
    ߹͸ɺهड़ྔʹݟ߹Θͳ
    ͍ɻ
    Notification NɿN ௚઀ͷࢀর͕ͳ͍ΦϒδΣΫ
    τؒͰ΋௨஌͕ՄೳɻΦϒδ
    ΣΫτ͕ؒૄ݁߹ɻ
    ଟ༻͢Δͱॲཧ͕௥͍ͮΒ
    ͘ͳΔɻάϩʔόϧͳείʔ
    ϓͰ௨஌Λߦ͏ͨΊɺϓϩ
    άϥϚ͕ҙਤ͠ͳ͍ॲཧ͕
    ಈ͍ͯ͠·͏Մೳੑ͕͋Δɻ
    KVO 1ɿN WKWebViewͳͲKVOʹରԠ
    ͨ͠Ϋϥεͱ૬ੑ͕ྑ͍ɻ
    Objective-CͷϥϯλΠϜ͕ඞ
    ཁɻߏ଄ମͰ͸ར༻Ͱ͖ͳ
    ͍ɻ
    Closure Callback 1ɿ1 ॲཧͷґཔ෦෼ͱ׬ྃޙͷ
    ॲཧΛۙ͘ʹॻ͘͜ͱ͕Ͱ
    ͖ɺՄಡੑ͕ߴ͍ɻ
    ωετ૿͑͗͢΍callbackϝ
    ιουଟ͗͢ͰՄಡੑ☓ɻ
    

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59. SwiftͱΦϒδΣΫτؒͷ௨஌ͷύλʔϯ
    ͓ΘΓ
    

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