アプリが動いたその先へ
 (iOS アプリ開発編)

Transcript

1. ΞϓϦ͕ಈ͍ͨͦͷઌ΁
 (iOS ΞϓϦ։ൃฤ) 2017/8/18
 ezura

2. “\(self)” • iOS engineer @ LINE • ֶੜ࣌: Android, iOS

   engineer • Swift, Objective-C, Kotlin, Java, … ezura (@eduraaa)

3. ୭ͩͬͯ࠷ॳ͸ॳ৺ऀ

4. ίʔυΛ੾ͬͯష͚ͬͯͬͭͯͨ͘Βɺ
 ΞϓϦ͕Ͱ͖͍ͯͨ ( 'ω')

5. Α͘Θ͔Βͳ͍ͱ͜Ζ΋͋Δ͚Ͳɺ
 ΞϓϦ͕Ͱ͖͍ͯͨ ( 'ω') retain…, delegate…, 
 tableView…, ฒྻॲཧ…

6. ͳΜ͔ϝϞϦϦʔΫ͚ͯͨ͠Ͳɺ
 ΞϓϦ͕Ͱ͖͍ͯͨ ( 'ω') ࠭ͷ͓৓ͷΑ͏ͳίʔυ…

7. ϓϩͱͯ͠ஏ͔ͣ͘͠ͳ͍ɺ
 ΞϓϦΛ࡞Γ͍ͨ ( 'ω') Ͳ͏͢Ε͹ྑ͍ΜͩΖ͏…

8. ॳ৺ऀͷͱ͖ٙ໰ͩͬͨ͜ͱɺ೰ΜͰͨ͜ͱ
 Α͘ฉ࣭͘໰ weak ͱ strong ͷ࢖͍෼͚ thread ؅ཧͬͯ
 ݁ہͲ͏͢Ε͹ྑ͍ͷʁ งғؾͰ

   thread Λ
 ࢖͍ͬͯΔ ॥؀ࢀরා͍
 Ͳ͏͢Ε͹๷͛Δͷʁ ࣗ෼ͷϓϩάϥϜͷ඼࣭ͬͯ
 ࣮ࡍʹͲͷϨϕϧͳͷ… ຊ౰͸μϝͳ͜ͱΛ
 ΍͍ͬͯΔͷͰ͸… storyboard ͸
 ࢖ͬͨํ͕ྑ͍ͷʁ

9. ݪଇɾݪཧ
 (جૅ) ঢ়گ + = ౴͑

10. ࠜຊతͳ෦෼Λ͓͞Β͍͠ͳ͕Β
 ٙ໰Λղܾ͍ͯ͜͠͏ ໨త

11. index • ࢀরपΓ • thread पΓ • ͦͷଞͷ͜ͱͰ࣭໰ɾ૬ஊ

12. ࢀরɾϝϞϦपΓ

13. ॥؀ࢀরΛͲ͏๷͛͹ྑ͍ͷʁ

14. weak ͱ strong ͷ࢖͍෼͚͸ʁ

15. ͦ΋ͦ΋ɺstrong ͱ͔ weak ͷࢦఆ͸
 ͳͥඞཁʁʁ

16. ΦϒδΣΫτΛ࡞Δ ↓ ΦϒδΣΫτͷσʔλΛஔ͍͓ͯ͘৔ॴ͕ඞཁ ↓ ΦϒδΣΫτͷσʔλΛஔ͍͓ͯ͘৔ॴΛϝϞϦ্ʹ֬อ͓ͯ͘͠ object

17. ΦϒδΣΫτΛ࡞Δ ↓ ΦϒδΣΫτͷσʔλΛஔ͍͓ͯ͘৔ॴ͕ඞཁ ↓ ΦϒδΣΫτͷσʔλΛஔ͍͓ͯ͘৔ॴΛϝϞϦ্ʹ֬อ͓ͯ͘͠ memory object

18. ΦϒδΣΫτΛ࡞Δ ↓ ΦϒδΣΫτͷσʔλΛஔ͍͓ͯ͘৔ॴ͕ඞཁ ↓ ΦϒδΣΫτͷσʔλΛஔ͍͓ͯ͘৔ॴΛϝϞϦ্ʹ֬อ͓ͯ͘͠ object memory

19. ͍ͭɺ֬อͨ͠ྖҬΛղ์͢Ε͹ྑ͍ʁʁ object memory

20. ͍ͭɺ֬อͨ͠ϝϞϦΛղ์͢Ε͹ྑ͍ʁʁ object memory object object ΋͏ೖΒͳ͍…
 མͪΑ…( ˘ω˘) object

21. object memory object object ΋͏ೖΒͳ͍…
 མͪΑ…( ˘ω˘) ͍ͭɺ֬อͨ͠ϝϞϦΛղ์͢Ε͹ྑ͍ʁʁ ↓ ΦϒδΣΫτ͕ෆཁʹͳͬͨͱ͖

    object

22. “ཁΒͳ͍” ͬͯɺͲ͏΍ͬͯ൑அ͢Ε͹ྑ͍ʁ

23. ϝϞϦͷ؅ཧ • Java, Ruby, JavaScript, … • ํ๏: Garbage Collection

    • Ͳ͔͜Β΋ࢀর͞Εͳ͘ͳͬͨΦϒδΣΫτΛ GC ͕ௐ΂ͯղ์
 (ਓ͕؅ཧ͠ͳ͍) • Swift, Objective-C • ํ๏: Reference Counting • ඞཁͳΒΧ΢ϯτΛ૿΍͠ɺཁΒͳ͘ͳͬͨΒΧ΢ϯτΛݮΒ͢
 Χ΢ϯτ͕ 0 ʹͳͬͨΒෆཁͱΈͳͯ͠ղ์
 (Reference Count = ΦϒδΣΫτΛඞཁͱ͍ͯ͠Δ෺ͷ਺)

24. Reference Counting • Swift, Objective-C • ARC (Automatic Reference Counting)

    • weak ࢀরͱ strong ࢀর • Objective-C (ੲ) • MRC (Manual Reference Counting) • [obj retain] ͱ͔ॻ͍ͯ͋ͬͨΒ͜Ε

25. Reference Counting • Swift, Objective-C • ARC (Automatic Reference Counting)

    • weak ࢀরͱ strong ࢀর • Objective-C (ੲ) • MRC (Manual Reference Counting) • [obj retain] ͱ͔ॻ͍ͯ͋ͬͨΒ͜Ε

26. Reference Count • ΦϒδΣΫτΛ࡞Γ·ͨ͠ object

27. Reference Count • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม਺͕͋Γ·͢ object strong let

    obj = object ࢀরΧ΢ϯτ += 1 
 => 1

28. Reference Count object strong let obj = object ࢀরΧ΢ϯτ -=

    1 
 => 0 • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม਺͕͋Γ·͢ • strong ࢀর͍ͯ͠Δม਺͕ͳ͘ͳΓ·ͨ͠

29. Reference Count • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม਺͕͋Γ·͢ • strong ࢀর͍ͯ͠Δม਺͕ͳ͘ͳΓ·ͨ͠

    • ΦϒδΣΫτ͸ղ์͞Ε·͢ object strong let obj = object ࢀরΧ΢ϯτ 
 => 0

30. Reference Count • ΦϒδΣΫτΛ࡞Γ·ͨ͠ object

31. Reference Count • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม਺͕͋Γ·͢ object strong let

    obj = object ࢀরΧ΢ϯτ += 1 
 => 1

32. Reference Count object strong let obj = object ࢀরΧ΢ϯτ 


    => 1 weak var obj = object • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม਺͕͋Γ·͢ • weak ࢀর͍ͯ͠Δม਺͕͋Γ·͢

33. Reference Count • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม਺͕͋Γ·͢ • weak ࢀর͍ͯ͠Δม਺͕͋Γ·͢

    • weak ࢀর͍ͯ͠Δม਺͕ͳ͘ͳΓ·ͨ͠ object strong let obj = object ࢀরΧ΢ϯτ 
 => 1 weak var obj = object

34. Reference Count • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม਺͕͋Γ·͢ • weak ࢀর͍ͯ͠Δม਺͕͋Γ·͢

    • weak ࢀর͍ͯ͠Δม਺͕ͳ͘ͳΓ·ͨ͠ object strong let obj = object ࢀরΧ΢ϯτ 
 => 1

35. Reference Count object strong let obj = object ࢀরΧ΢ϯτ +=

    1 
 => 1 weak var obj = object • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม਺͕͋Γ·͢ • weak ࢀর͍ͯ͠Δม਺͕͋Γ·͢

36. Reference Count object strong let obj = object ࢀরΧ΢ϯτ -=

    1 
 => 0 weak var obj = object • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม਺͕͋Γ·͢ • weak ࢀর͍ͯ͠Δม਺͕͋Γ·͢ • strong ࢀর͍ͯ͠Δม਺͕ͳ͘ͳΓ·ͨ͠

37. Reference Count object strong let obj = object ࢀরΧ΢ϯτ
 =>

    0 weak var obj = object • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม਺͕͋Γ·͢ • weak ࢀর͍ͯ͠Δม਺͕͋Γ·͢ • strong ࢀর͍ͯ͠Δม਺͕ͳ͘ͳΓ·ͨ͠ • ΦϒδΣΫτ͸ղ์͞Ε·͢

38. Reference Count object strong let obj = object ࢀরΧ΢ϯτ
 =>

    0 weak var obj = object • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม਺͕͋Γ·͢ • weak ࢀর͍ͯ͠Δม਺͕͋Γ·͢ • strong ࢀর͍ͯ͠Δม਺͕ͳ͘ͳΓ·ͨ͠ • ΦϒδΣΫτ͸ղ์͞Ε·͢ ஫: nil ͕୅ೖ͞ΕΔΘ͚Ͱ͸ͳ͍

39. ࢀর strong var obj objA strong var obj objB

40. ࢀর strong var obj = objB objA strong var obj

    = objA objB

41. ࢀর strong var obj = objB objA strong var obj

    = objA objB

42. ࢀর strong var obj = objB objA strong var obj

    = objA objB ॥؀ࢀর

43. ࢀর strong var obj = objB objA strong var obj

    = objA objB Ͳ͏ͨ͠Βղ์͞ΕΔʁ

44. ࢀর strong var obj = nil objA strong var obj

    = objA objB ໌ࣔతʹࢀরΛղ͘ඞཁ͕͋Δ

45. ࢀর strong var obj = nil objA strong var obj

    = objA objB Auto ͱ͸Ұମ… :(

46. ࢀর strong var obj = nil objA strong var obj

    = objA objB ʮͺͬͱݟΘ͔Βͳ͍͚Ͳɺ~͠ͳ͍ͱ͍͚ͳ͍ʯ
 ͷΑ͏ͳɺ҉໧తྃղͷ͋Δίʔυ͸͍͔ͭഁ໓͢Δ

47. ࢀর strong var obj = objB objA strong var obj

    = objA objB

48. ࢀর strong var obj = objB objA weak var obj

    = objA objB

49. ࢀর strong var obj = objB objA weak var obj

    = objA objB

50. ࢀর strong var obj = objB objA weak var obj

    = objA objB

51. ࢀর strong var obj = objB objA weak var obj

    = objA objB

52. ཧ࿦తʹ͸Θ͔͚ͬͨͲɺ
 Ͳ͏࢖͍෼͚Ε͹ྑ͍ͷʁ Object ؒͷؔ܎ੑ͔ΒܾΊΑ͏

53. ࢀর strong var obj = objB objA weak var obj

    = objA objB

54. ParentViewController ChildViewController strong var cvc = cvc weak var delegate

    = ChildViewController pvc ParentViewController

55. ParentViewController ChildViewController strong var cvc = cvc weak var delegate

    = ChildViewController pvc ParentViewController

56. ParentViewController
 ChildViewController strong var cvc = cvc weak var delegate

    = ChildViewController pvc ParentViewController

57. ParentViewController ChildViewController strong var cvc = cvc weak var delegate

    = ChildViewController pvc ParentViewController

58. ParentViewController
 ChildViewController strong var cvc = cvc weak var delegate

    = ChildViewController pvc ParentViewController

59. ParentViewController ChildViewController strong var cvc = cvc weak var delegate

    = ChildViewController pvc ParentViewController ParentViewController ͕͍ͳ͘ͳͬͨΒɺ ChildViewController ΋͍Βͳ͘ͳΔؔ܎

60. weak ͱ strong ͷ࢖͍෼͚͸ʁ Object ؒͷؔ܎ੑ͔ΒܾΊΑ͏

61. ॥؀ࢀরΛͲ͏๷͛͹ྑ͍ͷʁ લड़ͷ weak, strong ͷ࢖͍෼͚ closure ʹΑΔΩϟϓνϟʹؾΛ͚ͭΔ

62. ࢀর strong var obj = objB objA strong var obj

    = objA objB

63. ࢀর object closure object

64. ࢀর closure object object

65. ࢀর closure object object ΩϟϓνϟϦετ
 [weak self]

66. ༨ஊ closure object object ΩϟϓνϟϦετ
 [weak self]

67. ༨ஊ closure object object ΩϟϓνϟϦετ
 [weak self]

68. ༨ஊ closure object object ΩϟϓνϟϦετ
 [weak self]

69. ༨ஊ closure object object

70. ༨ஊ closure object object

71. ༨ஊ closure object object

72. ༨ஊ closure object object

73. ༨ஊ closure object object

74. ໰ 1 weak ʹ͢΂͖ʁ strong ʹ͢΂͖ʁ class ViewController: UIViewController {


    @IBOutlet /* weak? strong? */ var label: UILabel! … }

75. ໰ 1 ͲͪΒ΋Մೳ
 (ঢ়گʹΑΔ͚ΕͲɺ`weak` ͕ద͢Δ৔߹͕ଟ͍) class ViewController: UIViewController {
 @IBOutlet

    /* weak? strong? */ var label: UILabel! … }

76. ໰ 1 view viewController view sub views strong

77. ໰ 1 view viewController view sub views weak

78. ໰ 1 view viewController view sub views weak

79. ໰ 1 view viewController view sub views weak

80. ໰ 1 view viewController view sub views strong

81. ໰ 1 view viewController view sub views strong

82. ໰ 1 view viewController view sub views strong

83. ໰ 1 view viewController view sub views strong

84. ໰ 1 view viewController view sub views weak memory warning

    ൃੜ࣌ʹ
 view Λഁغ͢Δ৔߹͕͋ΔͷͰɺ
 weak ͷํ͕޷౎߹ͳ৔߹͕ଟ͍

85. ໰ 1 view viewController view sub views strong vc ࣗ਎͕ڧ͘ґଘ͍ͯ͠ΔͳΒɺ


    strong Ͱ΋ྑ͍৔߹΋͋Δ

86. ໰ 1 view viewController view sub views weak vc.view ͕׬શʹ໋ΛѲΔͳΒ


    weak ͕ద͍ͯ͠Δ

87. ໰ 1 view viewController view sub views weak vc.view ͕׬શʹ໋ΛѲΔͳΒ


    weak ͕ద͍ͯ͠Δ

88. ໰ 1 view viewController view sub views weak vc.view ͕׬શʹ໋ΛѲΔͳΒ


    weak ͕ద͍ͯ͠Δ

89. thread

90. Thread ͱ͸ʁ

91. • UIViewController ࡞੒ͯ͠ • ஋Λઃఆͯ͠ • ͦΕΛදࣔ ஋Λઃఆ ViewController 


    ࡞੒ දࣔ

92. DispatchQueue.main.async { // σʔλΛදࣔ } ஋Λઃఆ ViewController 
 ࡞੒ දࣔ

    • UIViewController ࡞੒ͯ͠ • ஋Λઃఆͯ͠ • ͦΕΛදࣔ • αʔό͔ΒσʔλΛͱ͖ͬͯͯ • σʔλΛදࣔ αʔόͱ௨৴ σʔλΛදࣔ thread thread

93. thread • thread of execution • single thread (Լਤ) ը૾Λ

    ը໘Λ੾Γସ͑Δ λοϓ͞Εͨ σʔλΛอଘ ड৴଴ͪ μ΢ϯϩʔυ࢝ΊΔ ड৴த εΫϩʔϧ

94. thread • thread of execution • multi thread (Լਤ) ը૾Λදࣔ͢Δ

    ը໘Λ੾Γସ͑Δ λοϓ͞Εͨ σʔλΛอଘ ड৴଴ͪ μ΢ϯϩʔυ࢝ΊΔ ड৴த εΫϩʔϧ

95. iOS Ͱͷૢ࡞ • GCD • NSOperation • ௚઀ thread Λѻ͏

    (͋·Γ΍Βͳ͍) • (Rx ͷϝιου౳Ͱࢦఆ) DispatchQueue.global().async { <#code#> }

96. iOS Ͱͷ thread • main thread • 1 ͚ͭͩ (ΞϓϦىಈ࣌ʹ࡞੒͞ΕΔ)

    • sub thread • ෳ਺ଘࡏՄೳ • ௨৴ॲཧɺDB ૢ࡞౳ͷॏ͍ॲཧ΍ϩάΛૹ৴͢ΔͳͲͷॲཧ

97. “UI ͷૢ࡞͸ main thread Ͱ΍Ζ͏”

98. main thread Ҏ֎Ͱ΍ͬͨΒͲ͏ͳΔͷʁ

99. Ͳ͏͍͏ͱ͖ɺ
 ͦΕΛҧ൓ͯ͠͠·͏ͷʁ

100. main thread ͬͯɺ
 Կऀʁ

101. main thread • ΞϓϦىಈ࣌ʹ࡞੒͞ΕΔ • Run loop ͕ճ͍ͬͯΔ • ΠϕϯτΛϋϯυϦϯά

     • λοϓ͞ΕͨͳͲͷ UI Πϕϯτ • ϥΠϑαΠΫϧ (ىಈͨ͠ɺ෮ؼͨ͠ɺ…) • දࣔͷߋ৽ • …

102. Run loop on main thread Πϕϯτདྷͳ͍͔ͳ

103. Run loop on main thread Πϕϯτདྷͳ͍͔ͳ

104. Run loop on main thread Πϕϯτདྷͳ͍͔ͳ λοϓͨ͠ʂ

105. Run loop on main thread དྷͨʂ
 View ʹ௨஌ͯ͠
 ఆٛ͞Εͯͨಈ࡞Λͯ͠…
 ΠϕϯτͷͨΊͷશͯͷॲཧΛͨ͠Β

106. Run loop on main thread Πϕϯτདྷͳ͍͔ͳ Πϕϯτདྷͳ͍͔ͳ

107. ΋͠ɺॏ͍ॲཧΛ main thread Ͱ΍Δͱ ௨৴։࢝ ௨৴଴ͬͯΔ DB ʹอଘ …

108. ΋͠ɺॏ͍ॲཧΛ main thread Ͱ΍Δͱ ௨৴։࢝ ௨৴଴ͬͯΔ DB ʹอଘ … λοϓͨ͠ʂ

109. ΋͠ɺॏ͍ॲཧΛ main thread Ͱ΍Δͱ ௨৴։࢝ ௨৴଴ͬͯΔ DB ʹอଘ … λοϓͨ͠ʂ

     ͝ΊΜɺ๩͍͠…

110. main thread • ΞϓϦىಈ࣌ʹ࡞੒͞ΕΔ • Run loop ͕ճ͍ͬͯΔ • ΠϕϯτΛϋϯυϦϯά

     • λοϓ͞ΕͨͳͲͷ UI Πϕϯτ • ϥΠϑαΠΫϧ (ىಈͨ͠ɺ෮ؼͨ͠ɺ…) • දࣔͷߋ৽ • …

111. “UI ͷૢ࡞͸ main thread Ͱ΍Ζ͏”

112. ໰ 1 @IBAction func buttonDidTap(_ sender: UIButton) { label.text =

     "Changed" label.textColor = .red sleep(2) view.backgroundColor = .green } 1.Label ͷ৭ͱςΩετΛมߋ 2.2 ඵؒ sleep 3.എܠ৭Λมߋ

113. ໰ 1 (౴͑) @IBAction func buttonDidTap(_ sender: UIButton) { label.text

     = "Changed" label.textColor = .red sleep(2) view.backgroundColor = .green } 1. 2 ඵؒ Ϣʔβͷૢ࡞Λड͚෇͚ͳ͍ 2. Label ͱ എܠͷද͕ࣔಉ࣌ʹมΘΔ

114. Πϕϯτ଴ͪ ը໘ͷߋ৽ λοϓ͞Εͨ = Ϣʔβ༝དྷͷૢ࡞
 λοϓ͞Εͨͱ͖ͷॲཧ (func buttonDidTap) ໰ 1

     (ղઆ) Πϕϯτ଴ͪ main thread

115. ໰ 2 @IBAction func buttonDidTap(_ sender: UIButton) { DispatchQueue.global().async {

     [label = label] in label?.text = "Changed" label?.textColor = .red } view.backgroundColor = .green } 1.sub thread Ͱ Label Λมߋ 2.main thread ͰഎܠΛมߋ

116. ໰ 2 (౴͑) @IBAction func buttonDidTap(_ sender: UIButton) { DispatchQueue.global().async

     { [label = label] in label?.text = "Changed" label?.textColor = .red } view.backgroundColor = .green } ෆఆͷಈ࡞

117. Πϕϯτ଴ͪ
 main loop ը໘ͷߋ৽ λοϓ͞Εͨ = Ϣʔβ༝དྷͷૢ࡞
 λοϓ͞Εͨͱ͖ͷॲཧ (func buttonDidTap)


     view ͷഎܠߋ৽ ໰ 2 (ղઆ) label ͷ text Λมߋ
 label ͷେ͖͞Λߋ৽
 ؔ࿈͢Δ view ͷ഑ஔΛ࠶ܭࢉ
 label ͷ৭Λมߋ
 … main thread sub thread

118. ໰ 3 override func viewDidLoad() { super.viewDidLoad() NotificationCenter.default .addObserver(forName: .notificationKey,

     object: nil, queue: nil) { _ in // ᶃ } } ᶃ ͸Ͳͷ thread Ͱಈ͘ʁ

119. ໰ 3 (౴͑) NotificationCenter.default
 ɹɹɹɹɹɹɹ .post(name: .notificationKey,
 ɹɹɹɹɹɹɹɹɹɹɹɹɹ object: nil)


     notification Λൃߦͨ͠ thread

120. “UI ͷૢ࡞͸ main thread Ͱ΍Ζ͏”

121. main thread Ҏ֎Ͱ΍ͬͨΒͲ͏ͳΔͷʁ ෆఆͷಈ࡞
 Ϋϥογϡ͢ΔՄೳੑ΋͋Δ

122. Ͳ͏͍͏ͱ͖ɺ
 ͦΕΛҧ൓ͯ͠͠·͏ͷʁ sub thread Ͱ UI Λૢ࡞͢ΔॲཧΛ࣮ߦͨ͠ͱ͖
 * UI Λૢ࡞͢ΔॲཧΛؚΜͰ͍Δ

     function Λ sub thread Ͱ࣮ߦ
 * UI Λૢ࡞͢ΔॲཧΛؚΉ closure Λ sub thread Ͱ࣮ߦ
 * didSet ౳ʹ UI Λૢ࡞͢ΔॲཧΛؚΜͰ͍ΔϓϩύςΟʹ sub thread Ͱ୅ೖॲཧ࣮ߦ
 * Rx Ͱɺ͍ͭͷؒʹ͔ sub thread Ͱ࣮ߦ͞ΕΔΑ͏ʹͳ͍ͬͯͨ
 ͳͲͳͲ

123. ๷͙ํ๏͸ʁ • UI ͷૢ࡞ΛؚΉ͜ͱΛ໊લ΍ίϝϯτͰ໌ࣔ͢Δ • sub thread Ͱ࣮ߦ͍ͯͯ͠ɺUI Λૢ࡞ͨ͘͠ͳͬͨΒɺGCD ౳Λ࢖ͬͯ


     main thread Ͱ࣮ߦ͢ΔΑ͏ʹ੍ޚ • Xcode9 Ͱ͸ UI ͷૢ࡞Λ sub thread ্Ͱ࣮ߦ͍ͯ͠Δͱܯࠂͯ͘͠ΕΔػೳ͕ ͋Δ

124. main thread ͬͯɺ
 Կऀʁ • UI ΠϕϯτͷϋϯυϦϯάͷ໾ׂ • ΞϓϦͷϥΠϑαΠΫϧͷ௨஌ •

     وॏͳϦιʔε (๩͍͠ͱΞϓϦ͕ΧΫͭ͘ݪҼʹͳΔ)

125. ·ͱΊ • ͋ΘͯͣɺجૅΛ਎ʹ͚ͭΔͱਊ͔Βڧ͘ͳΕΔ • weak, strong ͷ࢖͍෼͚ • ΦϒδΣΫτؒͷؔ܎ੑ͔Βߟ͑ͯΈΑ͏ •

     thread • main thread ্Ͱ UI ૢ࡞ • function ΍ closure ͸ݺͼग़͞Εͨ thread ্Ͱ࣮ߦ͞ΕΔͷΛ
 ೦಄ʹஔ͍ͯɺ࣮ߦ࣌ͷঢ়گΛ૝૾ͯ͠ΈΑ͏

126. Q&A