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

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“\(self)” • iOS engineer @ LINE • ֶੜ࣌: Android, iOS engineer • Swift, Objective-C, Kotlin, Java, … ezura (@eduraaa)

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୭ͩͬͯ࠷ॳ͸ॳ৺ऀ

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ίʔυΛ੾ͬͯష͚ͬͯͬͭͯͨ͘Βɺ
 ΞϓϦ͕Ͱ͖͍ͯͨ ( 'ω')

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

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ͳΜ͔ϝϞϦϦʔΫ͚ͯͨ͠Ͳɺ
 ΞϓϦ͕Ͱ͖͍ͯͨ ( 'ω') ࠭ͷ͓৓ͷΑ͏ͳίʔυ…

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

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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

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ݪଇɾݪཧ
 (جૅ) ঢ়گ + = ౴͑

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ࠜຊతͳ෦෼Λ͓͞Β͍͠ͳ͕Β
 ٙ໰Λղܾ͍ͯ͜͠͏ ໨త

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index • ࢀরपΓ • thread पΓ • ͦͷଞͷ͜ͱͰ࣭໰ɾ૬ஊ

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ࢀরɾϝϞϦपΓ

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॥؀ࢀরΛͲ͏๷͛͹ྑ͍ͷʁ

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weak ͱ strong ͷ࢖͍෼͚͸ʁ

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ͦ΋ͦ΋ɺstrong ͱ͔ weak ͷࢦఆ͸
 ͳͥඞཁʁʁ

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

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

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

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͍ͭɺ֬อͨ͠ྖҬΛղ์͢Ε͹ྑ͍ʁʁ object memory

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

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

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“ཁΒͳ͍” ͬͯɺͲ͏΍ͬͯ൑அ͢Ε͹ྑ͍ʁ

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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਺)

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

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

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Reference Count • ΦϒδΣΫτΛ࡞Γ·ͨ͠ object

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Reference Count • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม਺͕͋Γ·͢ object strong let obj = object ࢀরΧ΢ϯτ += 1 
 => 1

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Reference Count object strong let obj = object ࢀরΧ΢ϯτ -= 1 
 => 0 • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม਺͕͋Γ·͢ • strong ࢀর͍ͯ͠Δม਺͕ͳ͘ͳΓ·ͨ͠

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Reference Count • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม਺͕͋Γ·͢ • strong ࢀর͍ͯ͠Δม਺͕ͳ͘ͳΓ·ͨ͠ • ΦϒδΣΫτ͸ղ์͞Ε·͢ object strong let obj = object ࢀরΧ΢ϯτ 
 => 0

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Reference Count • ΦϒδΣΫτΛ࡞Γ·ͨ͠ object

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Reference Count • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม਺͕͋Γ·͢ object strong let obj = object ࢀরΧ΢ϯτ += 1 
 => 1

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Reference Count object strong let obj = object ࢀরΧ΢ϯτ 
 => 1 weak var obj = object • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม਺͕͋Γ·͢ • weak ࢀর͍ͯ͠Δม਺͕͋Γ·͢

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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

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Reference Count • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม਺͕͋Γ·͢ • weak ࢀর͍ͯ͠Δม਺͕͋Γ·͢ • weak ࢀর͍ͯ͠Δม਺͕ͳ͘ͳΓ·ͨ͠ object strong let obj = object ࢀরΧ΢ϯτ 
 => 1

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Reference Count object strong let obj = object ࢀরΧ΢ϯτ += 1 
 => 1 weak var obj = object • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม਺͕͋Γ·͢ • weak ࢀর͍ͯ͠Δม਺͕͋Γ·͢

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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·ͨ͠

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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·͢

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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

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ࢀর strong var obj objA strong var obj objB

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ࢀর strong var obj = objB objA strong var obj = objA objB

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ࢀর strong var obj = objB objA strong var obj = objA objB

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ࢀর strong var obj = objB objA strong var obj = objA objB ॥؀ࢀর

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ࢀর strong var obj = objB objA strong var obj = objA objB Ͳ͏ͨ͠Βղ์͞ΕΔʁ

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ࢀর strong var obj = nil objA strong var obj = objA objB ໌ࣔతʹࢀরΛղ͘ඞཁ͕͋Δ

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ࢀর strong var obj = nil objA strong var obj = objA objB Auto ͱ͸Ұମ… :(

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ࢀর strong var obj = nil objA strong var obj = objA objB ʮͺͬͱݟΘ͔Βͳ͍͚Ͳɺ~͠ͳ͍ͱ͍͚ͳ͍ʯ
 ͷΑ͏ͳɺ҉໧తྃղͷ͋Δίʔυ͸͍͔ͭഁ໓͢Δ

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ࢀর strong var obj = objB objA strong var obj = objA objB

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

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

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

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

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

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

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ParentViewController ChildViewController strong var cvc = cvc weak var delegate = ChildViewController pvc ParentViewController

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ParentViewController ChildViewController strong var cvc = cvc weak var delegate = ChildViewController pvc ParentViewController

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ParentViewController
 ChildViewController strong var cvc = cvc weak var delegate = ChildViewController pvc ParentViewController

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ParentViewController ChildViewController strong var cvc = cvc weak var delegate = ChildViewController pvc ParentViewController

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ParentViewController
 ChildViewController strong var cvc = cvc weak var delegate = ChildViewController pvc ParentViewController

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ParentViewController ChildViewController strong var cvc = cvc weak var delegate = ChildViewController pvc ParentViewController ParentViewController ͕͍ͳ͘ͳͬͨΒɺ ChildViewController ΋͍Βͳ͘ͳΔؔ܎

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

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

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ࢀর strong var obj = objB objA strong var obj = objA objB

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ࢀর object closure object

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ࢀর closure object object

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ࢀর closure object object ΩϟϓνϟϦετ
 [weak self]

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༨ஊ closure object object ΩϟϓνϟϦετ
 [weak self]

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༨ஊ closure object object ΩϟϓνϟϦετ
 [weak self]

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༨ஊ closure object object ΩϟϓνϟϦετ
 [weak self]

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༨ஊ closure object object

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༨ஊ closure object object

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༨ஊ closure object object

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༨ஊ closure object object

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༨ஊ closure object object

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໰ 1 weak ʹ͢΂͖ʁ strong ʹ͢΂͖ʁ class ViewController: UIViewController {
 @IBOutlet /* weak? strong? */ var label: UILabel! … }

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໰ 1 ͲͪΒ΋Մೳ
 (ঢ়گʹΑΔ͚ΕͲɺ`weak` ͕ద͢Δ৔߹͕ଟ͍) class ViewController: UIViewController {
 @IBOutlet /* weak? strong? */ var label: UILabel! … }

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໰ 1 view viewController view sub views strong

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໰ 1 view viewController view sub views weak

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໰ 1 view viewController view sub views weak

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໰ 1 view viewController view sub views weak

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໰ 1 view viewController view sub views strong

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໰ 1 view viewController view sub views strong

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໰ 1 view viewController view sub views strong

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໰ 1 view viewController view sub views strong

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໰ 1 view viewController view sub views weak memory warning ൃੜ࣌ʹ
 view Λഁغ͢Δ৔߹͕͋ΔͷͰɺ
 weak ͷํ͕޷౎߹ͳ৔߹͕ଟ͍

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໰ 1 view viewController view sub views strong vc ࣗ਎͕ڧ͘ґଘ͍ͯ͠ΔͳΒɺ
 strong Ͱ΋ྑ͍৔߹΋͋Δ

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

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

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

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thread

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Thread ͱ͸ʁ

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• UIViewController ࡞੒ͯ͠ • ஋Λઃఆͯ͠ • ͦΕΛදࣔ ஋Λઃఆ ViewController 
 ࡞੒ දࣔ

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DispatchQueue.main.async { // σʔλΛදࣔ } ஋Λઃఆ ViewController 
 ࡞੒ දࣔ • UIViewController ࡞੒ͯ͠ • ஋Λઃఆͯ͠ • ͦΕΛදࣔ • αʔό͔ΒσʔλΛͱ͖ͬͯͯ • σʔλΛදࣔ αʔόͱ௨৴ σʔλΛදࣔ thread thread

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thread • thread of execution • single thread (Լਤ) ը૾Λ ը໘Λ੾Γସ͑Δ λοϓ͞Εͨ σʔλΛอଘ ड৴଴ͪ μ΢ϯϩʔυ࢝ΊΔ ड৴த εΫϩʔϧ

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thread • thread of execution • multi thread (Լਤ) ը૾Λදࣔ͢Δ ը໘Λ੾Γସ͑Δ λοϓ͞Εͨ σʔλΛอଘ ड৴଴ͪ μ΢ϯϩʔυ࢝ΊΔ ड৴த εΫϩʔϧ

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iOS Ͱͷૢ࡞ • GCD • NSOperation • ௚઀ thread Λѻ͏ (͋·Γ΍Βͳ͍) • (Rx ͷϝιου౳Ͱࢦఆ) DispatchQueue.global().async { <#code#> }

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iOS Ͱͷ thread • main thread • 1 ͚ͭͩ (ΞϓϦىಈ࣌ʹ࡞੒͞ΕΔ) • sub thread • ෳ਺ଘࡏՄೳ • ௨৴ॲཧɺDB ૢ࡞౳ͷॏ͍ॲཧ΍ϩάΛૹ৴͢ΔͳͲͷॲཧ

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“UI ͷૢ࡞͸ main thread Ͱ΍Ζ͏”

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main thread Ҏ֎Ͱ΍ͬͨΒͲ͏ͳΔͷʁ

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Ͳ͏͍͏ͱ͖ɺ
 ͦΕΛҧ൓ͯ͠͠·͏ͷʁ

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main thread ͬͯɺ
 Կऀʁ

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main thread • ΞϓϦىಈ࣌ʹ࡞੒͞ΕΔ • Run loop ͕ճ͍ͬͯΔ • ΠϕϯτΛϋϯυϦϯά • λοϓ͞ΕͨͳͲͷ UI Πϕϯτ • ϥΠϑαΠΫϧ (ىಈͨ͠ɺ෮ؼͨ͠ɺ…) • දࣔͷߋ৽ • …

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Run loop on main thread Πϕϯτདྷͳ͍͔ͳ

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Run loop on main thread Πϕϯτདྷͳ͍͔ͳ

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Run loop on main thread Πϕϯτདྷͳ͍͔ͳ λοϓͨ͠ʂ

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

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Run loop on main thread Πϕϯτདྷͳ͍͔ͳ Πϕϯτདྷͳ͍͔ͳ

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

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

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΋͠ɺॏ͍ॲཧΛ main thread Ͱ΍Δͱ ௨৴։࢝ ௨৴଴ͬͯΔ DB ʹอଘ … λοϓͨ͠ʂ ͝ΊΜɺ๩͍͠…

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main thread • ΞϓϦىಈ࣌ʹ࡞੒͞ΕΔ • Run loop ͕ճ͍ͬͯΔ • ΠϕϯτΛϋϯυϦϯά • λοϓ͞ΕͨͳͲͷ UI Πϕϯτ • ϥΠϑαΠΫϧ (ىಈͨ͠ɺ෮ؼͨ͠ɺ…) • දࣔͷߋ৽ • …

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“UI ͷૢ࡞͸ main thread Ͱ΍Ζ͏”

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໰ 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

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໰ 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

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Πϕϯτ଴ͪ ը໘ͷߋ৽ λοϓ͞Εͨ = Ϣʔβ༝དྷͷૢ࡞
 λοϓ͞Εͨͱ͖ͷॲཧ (func buttonDidTap) ໰ 1 (ղઆ) Πϕϯτ଴ͪ main thread

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໰ 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

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໰ 2 (౴͑) @IBAction func buttonDidTap(_ sender: UIButton) { DispatchQueue.global().async { [label = label] in label?.text = "Changed" label?.textColor = .red } view.backgroundColor = .green } ෆఆͷಈ࡞

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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

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໰ 3 override func viewDidLoad() { super.viewDidLoad() NotificationCenter.default .addObserver(forName: .notificationKey, object: nil, queue: nil) { _ in // ᶃ } } ᶃ ͸Ͳͷ thread Ͱಈ͘ʁ

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

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“UI ͷૢ࡞͸ main thread Ͱ΍Ζ͏”

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

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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

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๷͙ํ๏͸ʁ • UI ͷૢ࡞ΛؚΉ͜ͱΛ໊લ΍ίϝϯτͰ໌ࣔ͢Δ • sub thread Ͱ࣮ߦ͍ͯͯ͠ɺUI Λૢ࡞ͨ͘͠ͳͬͨΒɺGCD ౳Λ࢖ͬͯ
 main thread Ͱ࣮ߦ͢ΔΑ͏ʹ੍ޚ • Xcode9 Ͱ͸ UI ͷૢ࡞Λ sub thread ্Ͱ࣮ߦ͍ͯ͠Δͱܯࠂͯ͘͠ΕΔػೳ͕ ͋Δ

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main thread ͬͯɺ
 Կऀʁ • UI ΠϕϯτͷϋϯυϦϯάͷ໾ׂ • ΞϓϦͷϥΠϑαΠΫϧͷ௨஌ • وॏͳϦιʔε (๩͍͠ͱΞϓϦ͕ΧΫͭ͘ݪҼʹͳΔ)

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·ͱΊ • ͋ΘͯͣɺجૅΛ਎ʹ͚ͭΔͱਊ͔Βڧ͘ͳΕΔ • weak, strong ͷ࢖͍෼͚ • ΦϒδΣΫτؒͷؔ܎ੑ͔Βߟ͑ͯΈΑ͏ • thread • main thread ্Ͱ UI ૢ࡞ • function ΍ closure ͸ݺͼग़͞Εͨ thread ্Ͱ࣮ߦ͞ΕΔͷΛ
 ೦಄ʹஔ͍ͯɺ࣮ߦ࣌ͷঢ়گΛ૝૾ͯ͠ΈΑ͏

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Q&A