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アプリが動いたその先へ (iOS アプリ開発編)
Yuka Ezura
August 18, 2017
Programming
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アプリが動いたその先へ (iOS アプリ開発編)
Yuka Ezura
August 18, 2017
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Transcript
1
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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࠷ॳॳ৺ऀ
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ίʔυΛͬͯష͚ͬͯͬͭͯͨ͘Βɺ ΞϓϦ͕Ͱ͖͍ͯͨ ( 'ω')
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Α͘Θ͔Βͳ͍ͱ͜Ζ͋Δ͚Ͳɺ ΞϓϦ͕Ͱ͖͍ͯͨ ( 'ω') retain…, delegate…, tableView…, ฒྻॲཧ…
6
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ͳΜ͔ϝϞϦϦʔΫ͚ͯͨ͠Ͳɺ ΞϓϦ͕Ͱ͖͍ͯͨ ( 'ω') ࠭ͷ͓ͷΑ͏ͳίʔυ…
7
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ϓϩͱͯ͠ஏ͔ͣ͘͠ͳ͍ɺ ΞϓϦΛ࡞Γ͍ͨ ( 'ω') Ͳ͏͢Εྑ͍ΜͩΖ͏…
8
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ॳ৺ऀͷͱ͖ٙͩͬͨ͜ͱɺΜͰͨ͜ͱ Α͘ฉ࣭͘ weak ͱ strong ͷ͍͚ thread ཧͬͯ ݁ہͲ͏͢Εྑ͍ͷʁ งғؾͰ
thread Λ ͍ͬͯΔ ॥ࢀরා͍ Ͳ͏͢Ε͛Δͷʁ ࣗͷϓϩάϥϜͷ࣭ͬͯ ࣮ࡍʹͲͷϨϕϧͳͷ… ຊμϝͳ͜ͱΛ ͍ͬͯΔͷͰ… storyboard ͬͨํ͕ྑ͍ͷʁ
9
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ݪଇɾݪཧ (جૅ) ঢ়گ + = ͑
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ࠜຊతͳ෦Λ͓͞Β͍͠ͳ͕Β ٙΛղܾ͍ͯ͜͠͏ త
11
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index • ࢀরपΓ • thread पΓ • ͦͷଞͷ͜ͱͰ࣭ɾ૬ஊ
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ࢀরɾϝϞϦपΓ
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॥ࢀরΛͲ͏͛ྑ͍ͷʁ
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weak ͱ strong ͷ͍͚ʁ
15
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ͦͦɺstrong ͱ͔ weak ͷࢦఆ ͳͥඞཁʁʁ
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ΦϒδΣΫτΛ࡞Δ ↓ ΦϒδΣΫτͷσʔλΛஔ͍͓ͯ͘ॴ͕ඞཁ ↓ ΦϒδΣΫτͷσʔλΛஔ͍͓ͯ͘ॴΛϝϞϦ্ʹ֬อ͓ͯ͘͠ object
17
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ΦϒδΣΫτΛ࡞Δ ↓ ΦϒδΣΫτͷσʔλΛஔ͍͓ͯ͘ॴ͕ඞཁ ↓ ΦϒδΣΫτͷσʔλΛஔ͍͓ͯ͘ॴΛϝϞϦ্ʹ֬อ͓ͯ͘͠ memory object
18
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ΦϒδΣΫτΛ࡞Δ ↓ ΦϒδΣΫτͷσʔλΛஔ͍͓ͯ͘ॴ͕ඞཁ ↓ ΦϒδΣΫτͷσʔλΛஔ͍͓ͯ͘ॴΛϝϞϦ্ʹ֬อ͓ͯ͘͠ object memory
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͍ͭɺ֬อͨ͠ྖҬΛղ์͢Εྑ͍ʁʁ object memory
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͍ͭɺ֬อͨ͠ϝϞϦΛղ์͢Εྑ͍ʁʁ object memory object object ͏ೖΒͳ͍… མͪΑ…( ˘ω˘) object
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object memory object object ͏ೖΒͳ͍… མͪΑ…( ˘ω˘) ͍ͭɺ֬อͨ͠ϝϞϦΛղ์͢Εྑ͍ʁʁ ↓ ΦϒδΣΫτ͕ෆཁʹͳͬͨͱ͖
object
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“ཁΒͳ͍” ͬͯɺͲ͏ͬͯஅ͢Εྑ͍ʁ
23
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ϝϞϦͷཧ • Java, Ruby, JavaScript, … • ํ๏: Garbage Collection
• Ͳ͔͜Βࢀর͞Εͳ͘ͳͬͨΦϒδΣΫτΛ GC ͕ௐͯղ์ (ਓ͕ཧ͠ͳ͍) • Swift, Objective-C • ํ๏: Reference Counting • ඞཁͳΒΧϯτΛ૿͠ɺཁΒͳ͘ͳͬͨΒΧϯτΛݮΒ͢ Χϯτ͕ 0 ʹͳͬͨΒෆཁͱΈͳͯ͠ղ์ (Reference Count = ΦϒδΣΫτΛඞཁͱ͍ͯ͠Δͷ)
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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
27
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Reference Count • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม͕͋Γ·͢ object strong let
obj = object ࢀরΧϯτ += 1 => 1
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Reference Count object strong let obj = object ࢀরΧϯτ -=
1 => 0 • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม͕͋Γ·͢ • strong ࢀর͍ͯ͠Δม͕ͳ͘ͳΓ·ͨ͠
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Reference Count • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม͕͋Γ·͢ • strong ࢀর͍ͯ͠Δม͕ͳ͘ͳΓ·ͨ͠
• ΦϒδΣΫτղ์͞Ε·͢ object strong let obj = object ࢀরΧϯτ => 0
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Reference Count • ΦϒδΣΫτΛ࡞Γ·ͨ͠ object
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Reference Count • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม͕͋Γ·͢ object strong let
obj = object ࢀরΧϯτ += 1 => 1
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Reference Count object strong let obj = object ࢀরΧϯτ
=> 1 weak var obj = object • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม͕͋Γ·͢ • weak ࢀর͍ͯ͠Δม͕͋Γ·͢
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Reference Count • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม͕͋Γ·͢ • weak ࢀর͍ͯ͠Δม͕͋Γ·͢
• weak ࢀর͍ͯ͠Δม͕ͳ͘ͳΓ·ͨ͠ object strong let obj = object ࢀরΧϯτ => 1 weak var obj = object
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Reference Count • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม͕͋Γ·͢ • weak ࢀর͍ͯ͠Δม͕͋Γ·͢
• weak ࢀর͍ͯ͠Δม͕ͳ͘ͳΓ·ͨ͠ object strong let obj = object ࢀরΧϯτ => 1
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Reference Count object strong let obj = object ࢀরΧϯτ +=
1 => 1 weak var obj = object • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม͕͋Γ·͢ • weak ࢀর͍ͯ͠Δม͕͋Γ·͢
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Reference Count object strong let obj = object ࢀরΧϯτ -=
1 => 0 weak var obj = object • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม͕͋Γ·͢ • weak ࢀর͍ͯ͠Δม͕͋Γ·͢ • strong ࢀর͍ͯ͠Δม͕ͳ͘ͳΓ·ͨ͠
37
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Reference Count object strong let obj = object ࢀরΧϯτ =>
0 weak var obj = object • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม͕͋Γ·͢ • weak ࢀর͍ͯ͠Δม͕͋Γ·͢ • strong ࢀর͍ͯ͠Δม͕ͳ͘ͳΓ·ͨ͠ • ΦϒδΣΫτղ์͞Ε·͢
38
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Reference Count object strong let obj = object ࢀরΧϯτ =>
0 weak var obj = object • ΦϒδΣΫτΛ࡞Γ·ͨ͠ • strong ࢀর͍ͯ͠Δม͕͋Γ·͢ • weak ࢀর͍ͯ͠Δม͕͋Γ·͢ • strong ࢀর͍ͯ͠Δม͕ͳ͘ͳΓ·ͨ͠ • ΦϒδΣΫτղ์͞Ε·͢ : nil ͕ೖ͞ΕΔΘ͚Ͱͳ͍
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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 ͱҰମ… :(
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ࢀর strong var obj = nil objA strong var obj
= objA objB ʮͺͬͱݟΘ͔Βͳ͍͚Ͳɺ~͠ͳ͍ͱ͍͚ͳ͍ʯ ͷΑ͏ͳɺ҉తྃղͷ͋Δίʔυ͍͔ͭഁ໓͢Δ
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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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ཧతʹΘ͔͚ͬͨͲɺ Ͳ͏͍͚Εྑ͍ͷʁ Object ؒͷؔੑ͔ΒܾΊΑ͏
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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 ͷ͍͚ʁ Object ؒͷؔੑ͔ΒܾΊΑ͏
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॥ࢀরΛͲ͏͛ྑ͍ͷʁ લड़ͷ weak, strong ͷ͍͚ 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 ʹ͖͢ʁ strong ʹ͖͢ʁ class ViewController: UIViewController {
@IBOutlet /* weak? strong? */ var label: UILabel! … }
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1 ͲͪΒՄೳ (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 Ͱྑ͍߹͋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 ͱʁ
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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
93
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thread • thread of execution • single thread (Լਤ) ը૾Λ
ը໘ΛΓସ͑Δ λοϓ͞Εͨ σʔλΛอଘ ड৴ͪ μϯϩʔυ࢝ΊΔ ड৴த εΫϩʔϧ
94
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thread • thread of execution • multi thread (Լਤ) ը૾Λදࣔ͢Δ
ը໘ΛΓସ͑Δ λοϓ͞Εͨ σʔλΛอଘ ड৴ͪ μϯϩʔυ࢝ΊΔ ड৴த εΫϩʔϧ
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iOS Ͱͷૢ࡞ • GCD • NSOperation • thread Λѻ͏
(͋·ΓΒͳ͍) • (Rx ͷϝιουͰࢦఆ) DispatchQueue.global().async { <#code#> }
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iOS Ͱͷ thread • main thread • 1 ͚ͭͩ (ΞϓϦىಈ࣌ʹ࡞͞ΕΔ)
• sub thread • ෳଘࡏՄೳ • ௨৴ॲཧɺDB ૢ࡞ͷॏ͍ॲཧϩάΛૹ৴͢ΔͳͲͷॲཧ
97
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“UI ͷૢ࡞ main thread ͰΖ͏”
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main thread Ҏ֎ͰͬͨΒͲ͏ͳΔͷʁ
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Ͳ͏͍͏ͱ͖ɺ ͦΕΛҧͯ͠͠·͏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৽ • …
102
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Run loop on main thread Πϕϯτདྷͳ͍͔ͳ
103
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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 ʹ௨ͯ͠ ఆٛ͞Εͯͨಈ࡞Λͯ͠… ΠϕϯτͷͨΊͷશͯͷॲཧΛͨ͠Β
106
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Run loop on main thread Πϕϯτདྷͳ͍͔ͳ Πϕϯτདྷͳ͍͔ͳ
107
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͠ɺॏ͍ॲཧΛ main thread ͰΔͱ ௨৴։࢝ ௨৴ͬͯΔ DB ʹอଘ …
108
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͠ɺॏ͍ॲཧΛ main thread ͰΔͱ ௨৴։࢝ ௨৴ͬͯΔ DB ʹอଘ … λοϓͨ͠ʂ
109
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͠ɺॏ͍ॲཧΛ main thread ͰΔͱ ௨৴։࢝ ௨৴ͬͯΔ DB ʹอଘ … λοϓͨ͠ʂ
͝ΊΜɺ͍͠…
110
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main thread • ΞϓϦىಈ࣌ʹ࡞͞ΕΔ • Run loop ͕ճ͍ͬͯΔ • ΠϕϯτΛϋϯυϦϯά
• λοϓ͞ΕͨͳͲͷ UI Πϕϯτ • ϥΠϑαΠΫϧ (ىಈͨ͠ɺ෮ؼͨ͠ɺ…) • දࣔͷߋ৽ • …
111
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“UI ͷૢ࡞ main thread ͰΖ͏”
112
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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
113
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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࡞Λड͚͚ͳ͍ 2. Label ͱ എܠͷද͕ࣔಉ࣌ʹมΘΔ
114
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Πϕϯτͪ ը໘ͷߋ৽ λοϓ͞Εͨ = Ϣʔβ༝དྷͷૢ࡞ λοϓ͞Εͨͱ͖ͷॲཧ (func buttonDidTap) 1
(ղઆ) Πϕϯτͪ main thread
115
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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
116
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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࡞
117
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Πϕϯτͪ main loop ը໘ͷߋ৽ λοϓ͞Εͨ = Ϣʔβ༝དྷͷૢ࡞ λοϓ͞Εͨͱ͖ͷॲཧ (func buttonDidTap)
view ͷഎܠߋ৽ 2 (ղઆ) label ͷ text Λมߋ label ͷେ͖͞Λߋ৽ ؔ࿈͢Δ view ͷஔΛ࠶ܭࢉ label ͷ৭Λมߋ … main thread sub thread
118
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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
119
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3 (͑) NotificationCenter.default ɹɹɹɹɹɹɹ .post(name: .notificationKey, ɹɹɹɹɹɹɹɹɹɹɹɹɹ object: nil)
notification Λൃߦͨ͠ thread
120
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“UI ͷૢ࡞ main thread ͰΖ͏”
121
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main thread Ҏ֎ͰͬͨΒͲ͏ͳΔͷʁ ෆఆͷಈ࡞ Ϋϥογϡ͢ΔՄೳੑ͋Δ
122
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Ͳ͏͍͏ͱ͖ɺ ͦΕΛҧͯ͠͠·͏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 Ͱೖॲཧ࣮ߦ * Rx Ͱɺ͍ͭͷؒʹ͔ sub thread Ͱ࣮ߦ͞ΕΔΑ͏ʹͳ͍ͬͯͨ ͳͲͳͲ
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͙ํ๏ʁ • UI ͷૢ࡞ΛؚΉ͜ͱΛ໊લίϝϯτͰ໌ࣔ͢Δ • sub thread Ͱ࣮ߦ͍ͯͯ͠ɺUI Λૢ࡞ͨ͘͠ͳͬͨΒɺGCD Λͬͯ
main thread Ͱ࣮ߦ͢ΔΑ͏ʹ੍ޚ • Xcode9 Ͱ UI ͷૢ࡞Λ sub thread ্Ͱ࣮ߦ͍ͯ͠Δͱܯࠂͯ͘͠ΕΔػೳ͕ ͋Δ
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main thread ͬͯɺ Կऀʁ • UI ΠϕϯτͷϋϯυϦϯάͷׂ • ΞϓϦͷϥΠϑαΠΫϧͷ௨ •
وॏͳϦιʔε (͍͠ͱΞϓϦ͕ΧΫͭ͘ݪҼʹͳΔ)
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·ͱΊ • ͋ΘͯͣɺجૅΛʹ͚ͭΔͱਊ͔Βڧ͘ͳΕΔ • weak, strong ͷ͍͚ • ΦϒδΣΫτؒͷؔੑ͔Βߟ͑ͯΈΑ͏ •
thread • main thread ্Ͱ UI ૢ࡞ • function closure ݺͼग़͞Εͨ thread ্Ͱ࣮ߦ͞ΕΔͷΛ ೦಄ʹஔ͍ͯɺ࣮ߦ࣌ͷঢ়گΛ૾ͯ͠ΈΑ͏
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Q&A
Yuka Ezura
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![༨ஊ closure object object ΩϟϓνϟϦετ [weak self]](https://files.speakerdeck.com/presentations/d95e49a5537d4c05945119dfc75fc868/slide_65.jpg){kind=link}
![༨ஊ closure object object ΩϟϓνϟϦετ [weak self]](https://files.speakerdeck.com/presentations/d95e49a5537d4c05945119dfc75fc868/slide_66.jpg){kind=link}
![༨ஊ closure object object ΩϟϓνϟϦετ [weak self]](https://files.speakerdeck.com/presentations/d95e49a5537d4c05945119dfc75fc868/slide_67.jpg){kind=link}
