iOSアプリの開発速度を170%に向上させたデバッグノウハウ / Debugging knowhow that improved our development velocity to 170%

by Kuniwak

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J04 ΞϓϦͷ։ൃ଎౓Λ  ʹ޲্ͤͨ͞  σόοάϊ΢ϋ΢ Kuniwak - DeNA Co.,Ltd. 2018.09.02 iOSDC Japan 2018

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"CPVUNF

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,VOJXBL w ॴଐˠ w HJUIVCDPN,VOJXBL w RJJUBDPN,VOJXBL w "QQ$PEF-PWFS

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͜ͷൃදͰ։ൃ଎౓Λ  ͋͛ΒΕΔਓ ͸͡Ίʹ

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్த·Ͱ͏·͍͘͘ͷʹ  కΊ੾Γʹؒʹ߹Θͳ͍

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కΊ੾Γ͕ഭͬͯ͘Δͱ  ಈ࡞֬ೝΛ͖͠Εͳͯ͘  େৎ෉ͩͱ৴͡Δ͔͠ͳ͍

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4JNVMBUPSΆͪΆͪʹ  ͕͔͔࣌ؒͬͯΠϥΠϥ͢Δ

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͜Μͳ͓೰Έɺօ͞Μʹ΋͋Γ·ͤΜ͔ʁ ͜͏վળͨ͠Αʂͱ͍ͬͨମݧ͕͋Ε͹ɺ  ͥͻUXFFU͍ͯͩ͘͠͞ʂ

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͜ͷൃදͰ఻͍͑ͨ͜ͱ ͓೰Έͷ͋ͳͨ΁

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΁ͷ։ൃ଎౓޲্Λࢧ͑ͨͭͷϊ΢ϋ΢ɿ --%#Λ࢖͍͜ͳ͢ σόοάͷλΠϛϯάΛมߋ௚ޙʹ͢Δ ෆ҆ۦಈͰηϧϑνΣοΫ͢Δ ಈ࡞֬ೝΛࣗಈԽ͢Δ ؒҧ͍ʹ͍͘ઃܭʹ͢Δ

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͜ͷൃදͷޙ൒͔Β͸ɺσόοάࣗମͷϊ΢ϋ΢ͷ  આ໌ΑΓ΋ɺߴ౓ͳσόοάΛඞཁͱ͠ͳ͍ͨΊͷ  ϊ΢ϋ΢ͷઆ໌͕ओʹͳ͍͖ͬͯ·͢ ͜͏ͨ͠ҙਤ͸ɺσόοά͸ඇޮ཰తͳ࡞ۀͰ͋Γɺ  σόοάͷස౓ΛԼ͛Δ͜ͱ͕ͦ͜σόοάʹର͢Δ  ༗ޮͳྟΈํͩͱ͍͏ࢲͷ৴೦͔Β͖͍ͯ·͢ ஫ҙॻ͖

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ϊ΢ϋ΢ͷ঺հ ։ൃ଎౓Λ޲্ͤ͞Δ

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--%#Λ࢖͍͜ͳ͢ Φεεϝ౓ʜ ϊ΢ϋ΢

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σόοάͷ࣌ؒͰϦϏϧυʹ  ͔͔͍ͬͯΔ࣌ؒ͸গͳ͘ͳ͍ ϦϏϧυΛආ͚ΒΕΕ͹  σόοά࣌ؒΛ୹ॖͰ͖Δ

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--%#ͱ͍͏σόοάπʔϧΛۦ࢖ͯ͠  ࣍ͷͭͷํ๏ͰϦϏϧυΛආ͚ΒΕΔɿ ίʔϧελοΫΛḪΔ ϦϏϧυͳ͠Ͱ࠶࣮ߦ͢Δ ىಈͨ͠··ঢ়ଶΛมߋ͢Δ " # $

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ϊ΢ϋ΢ʵ" ίʔϧελοΫΛḪΔ CSFBLQPJOUΛ࢖͏໨తͷͭ͸ɺ͋Δ࣌఺ͷ  ม਺ͳͲΛ֬ೝ͢Δ͜ͱ Կ͔͓͔͚͠Ε͹ɺ΋͏গ͠աڈʹḪͬͯ  ม਺Λ֬ೝ͢Δ͜ͱʹͳΔ ͜ΕΛCSFBLQPJOUͷషΓ௚͠ͱ  ϦϏϧυͰ΍Δͱ͕͔͔࣌ؒΔ

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ίʔϧελοΫʹ࢒͍ͬͯΔม਺ͳΒɺ  ϦϏϧυ͠ͳ͍Ͱ΋֬ೝͰ͖Δ ࣮͸

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ίʔϧελοΫͱ͸ʜʁ

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func foo(_ fooArg: Int) { let fooVar = fooArg + 5 bar(fooVar) } func bar(_ barArg: Int) { let barVar = barArg * 7 baz(barVar) } func baz(_ bazArg: Int) { let bazVar = "\(bazArg)" print(bazVar) } ίʔϧελοΫ Ҿ਺ ϩʔΧϧม਺ GPP"SH GPP7BS GPPؔ਺ ؔ਺͕ݺͼग़͞ΕΔͱɺ  ελοΫϑϨʔϜ͕࡞੒͞Εɺ  ίʔϧελοΫʹੵ·ΕΔ

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func foo(_ fooArg: Int) { let fooVar = fooArg + 5 bar(fooVar) } func bar(_ barArg: Int) { let barVar = barArg * 7 baz(barVar) } func baz(_ bazArg: Int) { let bazVar = "\(bazArg)" print(bazVar) } ᶄ಺෦Ͱؔ਺Λ࣮ߦ ίʔϧελοΫ Ҿ਺ ϩʔΧϧม਺ GPP"SH GPP7BS GPPؔ਺

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func foo(_ fooArg: Int) { let fooVar = fooArg + 5 bar(fooVar) } func bar(_ barArg: Int) { let barVar = barArg * 7 baz(barVar) } func baz(_ bazArg: Int) { let bazVar = "\(bazArg)" print(bazVar) } ίʔϧελοΫ Ҿ਺ ϩʔΧϧม਺ GPP"SH GPP7BS GPPؔ਺ Ҿ਺ ϩʔΧϧม਺ CBS"SH CBS7BS CBSؔ਺ ݺͼग़͞Εͨؔ਺ͷதͰ  ͞Βʹผͷؔ਺͕ݺ͹Εͯ΋  ίʔϧελοΫʹੵ·ΕΔ

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func foo(_ fooArg: Int) { let fooVar = fooArg + 5 bar(fooVar) } func bar(_ barArg: Int) { let barVar = barArg * 7 baz(barVar) } func baz(_ bazArg: Int) { let bazVar = "\(bazArg)" print(bazVar) } ᶅ͞Βʹ಺෦Ͱؔ਺Λ࣮ߦ ίʔϧελοΫ Ҿ਺ ϩʔΧϧม਺ GPP"SH GPP7BS GPPؔ਺ Ҿ਺ ϩʔΧϧม਺ CBS"SH CBS7BS CBSؔ਺

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func foo(_ fooArg: Int) { let fooVar = fooArg + 5 bar(fooVar) } func bar(_ barArg: Int) { let barVar = barArg * 7 baz(barVar) } func baz(_ bazArg: Int) { let bazVar = "\(bazArg)" print(bazVar) } ίʔϧελοΫ Ҿ਺ ϩʔΧϧม਺ GPP"SH GPP7BS GPPؔ਺ Ҿ਺ ϩʔΧϧม਺ CBS"SH CBS7BS CBSؔ਺ Ҿ਺ ϩʔΧϧม਺ CB["SH CB[7BS CB[ؔ਺ ίʔϧελοΫʹੵ·ΕΔ

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func foo(_ fooArg: Int) { let fooVar = fooArg + 5 bar(fooVar) } func bar(_ barArg: Int) { let barVar = barArg * 7 baz(barVar) } func baz(_ bazArg: Int) { let bazVar = "\(bazArg)" print(bazVar) } ᶆϒϨʔΫϙΠϯτͰࢭΊΔ ίʔϧελοΫ Ҿ਺ ϩʔΧϧม਺ GPP"SH GPP7BS GPPؔ਺ Ҿ਺ ϩʔΧϧม਺ CBS"SH CBS7BS CBSؔ਺ Ҿ਺ ϩʔΧϧม਺ CB["SH CB[7BS CB[ؔ਺

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func foo(_ fooArg: Int) { let fooVar = fooArg + 5 bar(fooVar) } func bar(_ barArg: Int) { let barVar = barArg * 7 baz(barVar) } func baz(_ bazArg: Int) { let bazVar = "\(bazArg)" print(bazVar) } ίʔϧελοΫ Ҿ਺ ϩʔΧϧม਺ GPP"SH GPP7BS GPPؔ਺ Ҿ਺ ϩʔΧϧม਺ CBS"SH CBS7BS CBSؔ਺ Ҿ਺ ϩʔΧϧม਺ CB["SH CB[7BS CB[ؔ਺ ࢭ·ͬͨ࣌ʹݟ͍͑ͯΔ΋ͷ

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func foo(_ fooArg: Int) { let fooVar = fooArg + 5 bar(fooVar) } func bar(_ barArg: Int) { let barVar = barArg * 7 baz(barVar) } func baz(_ bazArg: Int) { let bazVar = "\(bazArg)" print(bazVar) } ίʔϧελοΫ Ҿ਺ ϩʔΧϧม਺ GPP"SH GPP7BS GPPؔ਺ Ҿ਺ ϩʔΧϧม਺ CBS"SH CBS7BS CBSؔ਺ Ҿ਺ ϩʔΧϧม਺ CB["SH CB[7BS CB[ؔ਺ ࣮͸શ෦--%#͔ΒݟΒΕΔ

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9DPEF "QQ$PEF ίʔϧελοΫͷḪΓํ ͕͜͜ίʔϧελοΫ

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9DPEF "QQ$PEF ݟ͍ͨελοΫϑϨʔϜΛબ΂Δ ίʔϧελοΫͷḪΓํ

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9DPEF "QQ$PEF ͦͷ࣌఺ͷม਺΍Ҿ਺ΛݟΒΕΔ ίʔϧελοΫͷḪΓํ

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ϊ΢ϋ΢ʵ# ϦϏϧυͳ͠Ͱ࠶࣮ߦ͢Δ ίʔϧελοΫΛḪΔํ๏Ͱ͸ɺ͢Ͱʹ  ࣮ߦ͕ऴΘͬͯ͠·ͬͨؔ਺ͷม਺ΛݟΒΕͳ͍ ͦͷ৔߹͸࠶࣮ߦ͠ͳ͚Ε͹ͳΒͳ͍͕ɺίʔυʹ  มߋΛՃ͍͑ͯͳ͚Ε͹ϦϏϧυ͠ͳ͍Ͱ  ࠶࣮ߦͨ͠΄͏͕࣌ؒΛઅ໿Ͱ͖Δ

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9DPEF ϦϏϧυͳ͠ͷ࠶࣮ߦͷ΍Γํ "QQ$PEF ᶃϏϧυઃఆฤू ᶄ࠶࣮ߦ͍ͨ͠  ઃఆΛίϐʔ ᶅ#VJMEΛ࡟আ ᶆ࡞੒ͨ͠ઃఆΛ࣮ߦ ΞϓϦΛ࠶ىಈͯ͠  "UUBDIUP1SPDFTTͰ΋  ࣅͨΑ͏ͳ͜ͱΛͰ͖·͢ ผͷํ๏

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ϊ΢ϋ΢ʵ$ ىಈͨ͠··ঢ়ଶΛมߋ͢Δ ม਺ͷ಺༰Λॻ͖׵͑Δ͚ͩͳΒɺ  ϦϏϧυͳ͠Ͱ΋Մೳ ίʔυม਺ͷ಺༰ΛҰ࣌తʹॻ͖׵͑ͯ  ಈ࡞Λ͔֬Ί͍ͨ৔߹ʹศར σβΠφʔͱͷ࣮ػ֬ೝͳͲͰ  Α͘ॏๅͨ͠ςΫχοΫ

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มߋΛ࢝ΊΔͨΊͷҰ࣌ఀࢭͷ΍Γํ 9DPEF "QQ$PEF

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--%#ͷೖྗΠϯλʔϑΣʔεΛ֬ೝ 9DPEF "QQ$PEF --%#ͷίϚϯυϥΠϯΠϯλʔϑΣʔε͕ىಈ͢Δ

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(lldb) help Debugger commands: apropos -- List debugger commands related to a breakpoint -- Commands for operating on breakpoint shorthand.) ... IFMQΛ࣮ߦ͢Δͱɺ࣮ߦͰ͖Δૢ࡞ͷҰཡ͕දࣔ͞ΕΔ

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(lldb) help po  Evaluate an expression on the current  thread. Displays any returned value  with formatting controlled by the type's  author. Expects 'raw' input (see 'help  raw-input'.) ࠓճ͸--%#ܦ༝ͰίʔυΛ࣮ߦ͢ΔQPΛ࢖͏ ҙ༁: ݱࡏͷεϨουͰίʔυΛධՁ͠ɺ݁Ռͷ  ஋ΛਓؒʹಡΈ΍͍͢ܗͰදࣔ͠·͢ɻ

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(lldb) po print("Hello, World") error: use of undeclared identifier 'print' QPίϚϯυͰ)FMMP 8PSMEΛදࣔͯ͠ΈΑ͏ "QQ$PEFͷਓ͸͜ͷΤϥʔ͕ग़ͳ͍͔΋

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ݱࡏͷελοΫϑϨʔϜΛ֬ೝ 9DPEF "QQ$PEF 4XJGUͷελοΫϑϨʔϜ΁Ҡಈ ࠷ॳ͔Β4XJGUͷελοΫϑϨʔϜΛ  બ୒ͯ͘͠Ε͍ͯΔ͜ͱ͕ଟ͍

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(lldb) po print("Hello, World") Hello, World ΋͏Ұ౓QPίϚϯυͰ)FMMP 8PSMEΛදࣔͯ͠ΈΑ͏ ͏·࣮͘ߦͰ͖ͨ

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QPίϚϯυΛ࢖͏ͱɺىಈதͷΞϓϦͷ  ద౰ͳ6*7JFXͷঢ়ଶΛม͑ΒΕΔ ͜ͷදࣔจࣈྻΛม͑ͯΈΑ͏

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(lldb) po UIApplication.shared.keyWindow!  .value(forKey: "recursiveDescription")! (layer) ·ͣɺදࣔ͞Ε͍ͯΔ6*7JFXͷҰཡΛදࣔ

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(lldb) po UIApplication.shared.keyWindow!  .value(forKey: "recursiveDescription")! (layer) දࣔ͞Ε͍ͯΔΫϥεͷܕ΍ϝϞϦΞυϨεΛೖखͰ͖Δ

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(lldb) po let $label = unsafeBitCast(0x7fbee0610fe0, to: UILabel.self) ܕͱϝϞϦΞυϨε͕Θ͔ΔͱɺunsafeBitCastͰ  ΠϯελϯεΛऔಘͰ͖Δ

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(lldb) po let $label = unsafeBitCast(0x7fbee0610fe0, to: UILabel.self) ม਺΍ؔ਺ͳͲͷએݴΛ͢Δ৔߹͸ɺ໊લΛ͔Β࢝Ίͳ͍ͱແࢹ͞ΕΔͷͰ஫ҙ

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(lldb) po $label

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(lldb) po $label.text = "Hello, World!" $label ͷςΩετΛॻ͖׵͑ͯΈΑ͏

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ΞϓϦͷ࣮ߦΛ࠶։͢Δ΍Γํ 9DPEF "QQ$PEF

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UILabelͷද͕ࣔมΘͬͨʂ

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5*14 ελοΫϑϨʔϜΛม͑ΔҎ֎ͷํ๏ ઌ΄Ͳ͸ελοΫϑϨʔϜΛ4XJGUͷ΋ͷʹ  ߹Θͤͳ͍ͱΤϥʔʹͳ͍ͬͯͨ ࣮͸ɺԼͷΑ͏ʹ࣮ߦ͢ΔͱɺελοΫϑϨʔϜΛ  ม͑ͳͯ͘΋Τϥʔ͸ൃੜ͠ͳ͍ ҙຯ͸help expr Ͱௐ΂ͯΈΑ͏ (lldb) expr -l swift -o -- print("Hello, World") ൃ ද Ͱ ͸ ׂ Ѫ

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ݟͨ໨ͷมߋΛ΋ͬͱ؆୯ʹ 3FWFBMͱ͍͏ΞϓϦʢ༗ྉʣ͕ͱͯ΋ศར  'SFF5SJBM͕͋ΔͷͰɺࢼͯ͠ΈΔͱ͍͍͔΋ʁ ྫ͑͹6*-BCFMͷ  ςΩετΛม͑ΒΕΔ ಛʹ"VUP-BZPVUͷ  σόοάʹॏๅ͢Δ https://revealapp.com 5*14 ൃ ද Ͱ ͸ ׂ Ѫ

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ϊ΢ϋ΢ͷ·ͱΊ σόοΨΛ࢖͏ͱͭͷํ๏Ͱ  ϦϏϧυΛආ͚ΒΕΔɿ ίʔϧελοΫΛḪΔ ϦϏϧυͳ͠Ͱ࠶࣮ߦ͢Δ ىಈͨ͠··ঢ়ଶΛมߋ͢Δ " # $

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σόοάͷλΠϛϯάΛ  มߋ௚ޙʹ͢Δ ϊ΢ϋ΢ Φεεϝ౓ʜ

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ݪҼͷજΉൣғΛߜΓࠐΉͷ΋  σόοά࣌୹ͷ༗ޮͳςΫχοΫ

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GVODDMBTTTUSVDUFOVNͱ͍ͬͨ  খ͞ͳ୯Ґͷ࣮૷௚ޙʹσόοάΛ  ͢Ε͹ɺݪҼ͸௚લͷൣғʹߜΒΕΔ ۩ମతʹ͸

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ॏཁͳͷ͸ɺมߋͱ֬ೝͷαΠΫϧΛ  ͳΔ΂͘୹ִ͍ؒͰճͤΔΑ͏ʹอͭ͜ͱ ίʔυͷ  มߋ ಈ࡞֬ೝ

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struct Example { static func intToString(_ i: Int?) -> String { let x: Int! = i return "\(x)" } } ྫ͑͹ɺ੔਺Λਐ਺දهͷจࣈྻ΁  ม׵͢ΔίʔυΛ࣮૷ͨ͠ͱ͢Δ ྫ͑͹ɺΛҾ਺ʹ͢Ε͹ɺਐ਺  จࣈྻͰ͋Δ͕ฦ͖ͬͯͯ΄͍͠

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ผͷίʔυͰ࢖͏લʹ--%#Ͱಈ࡞Λ֬ೝ͠Α͏ ʢ--%#͸ΞϓϦͷҰ࣌ఀࢭͰىಈͰ͖Δʣ (lldb) po Example.intToString(42)

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(lldb) po Example.intToString(42) "Optional(42)"

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struct Example { static func intToString(_ i: Int?) -> String { let x: Int! = i return "\(x)" } } όάΛݟ͚ͭͨΒ௚લͷ࣮૷Օॴʹ໭Ζ͏

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struct Example { static func intToString(_ i: Int?) -> String { let x: Int = i! return "\(x)" } } Int!ΛจࣈྻԽ͢Δͱ"Optional(...)"ʹ  ͳͬͯ͠·͏ͷͰɺIntʹͳΔΑ͏मਖ਼͢Δ

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struct Example { static func intToString(_ i: Int?) -> String { let x: Int! = i return "\(x)" } } ࣮૷௚ޙʹσόοάͨ͠ͷͰɺ  ݪҼՕॴ͕͙ۙ͘͢ʹݟ͔ͭͬͨ

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मਖ਼ͨ͠Βɺ·͙ͨ͢ʹಈ࡞֬ೝ͠Α͏ (lldb) po Example.intToString(42) "42" ࠓ౓͸େৎ෉ͦ͏ͩ

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5*14 --%#ͰCSFBLQPJOUΛޮ͔ͤΔํ๏ --%#ͷpo΍exprʹΑΔ࣮ߦͰCSFBLQPJOU͕  ޮ͔ͳͯ͘ࠔΔ͜ͱ͕͋Δ ͦ͜Ͱɺexprͷ-iΦϓγϣϯΛfalseʹ͢Δͱɺ  --%#͔Βͷ࣮ߦͰ΋CSFBLQPJOU͕ޮ͘Α͏ʹͳΔ (lldb) expr -l swift -o -i false -- Example.intToString(42) ൃ ද Ͱ ͸ ׂ Ѫ

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ϊ΢ϋ΢ͷ·ͱΊ ͳΔ΂͘୹͘ૉૣ͘ճ͢ ίʔυͷ  มߋ ಈ࡞֬ೝ

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ෆ҆ۦಈͰηϧϑνΣοΫ͢Δ ϊ΢ϋ΢ Φεεϝ౓ʜ

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Α͋͘Δ։ൃ଎౓௿ԼͷݪҼ͸ख໭Γ ࣗ෼ͷಈ࡞֬ೝ͕ෆ׬શͩͬͨΓɺ  ࢥ͍΋͔ͭͳ͍όά͕͋ͬͨΓ͢Δͱ  σόοά·Ͱख໭Γͯ͠͠·͏

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͕࣌ؒܦͭ΄ͲݪҼ͕Θ͔Βͳ͘ͳΔ ༨ܭͳίϛϡχέʔγϣϯ͕૿͑Δ కΊ੾Γ௒աͷ࠷ޙͷҰԡ͠͸͍͍ͩͨख໭Γ ख໭ΓʹΑͬͯੜ͡Δ໰୊

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͕࣌ؒܦͭ΄ͲݪҼ͕Θ͔Βͳ͘ͳΔ ͜ΕมͳͷͰݟͯ΋Β͑·͢ʁ ઌि࣮૷ͨ͠΍͚ͭͩͲ  ͲΜͳײ͡ʹ͚ͨͬ͠ʜʁ ಈ࡞֬ೝ୲౰ ࣮૷ऀ

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༨ܭͳίϛϡχέʔγϣϯ͕૿͑Δ ͜Εόάͬͯ·ͤΜ͔ʁ खॱΛڭ͑ͯ΋Β͑·͔͢ʁ ͑ʔͱɺ"Λ#͔ͯ͠Βʜ ಈ࡞֬ೝ୲౰ ࣮૷ऀ

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కΊ੾Γ௒աͷ࠷ޙͷҰԡ͠͸͍͍ͩͨख໭Γ ࣮૷ ࣮૷ ࣮૷ ϨϏϡʔ ϨϏϡʔ ϨϏϡʔ ಈ࡞֬ೝ ख໭ΓରԠ ಈ࡞֬ೝ ਓ਺Ͱεέʔϧ͠ͳ͍ $͞Μ ,VOJXBL "͞Μ #͞Μ

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ͳΔ΂ࣗ͘෼ͰόάΛݟ͚ͭͯɺ  ख໭ΓΛݮΒ͍ͯ͘͜͠ͱ͕ॏཁ ଟগ͕͔͔࣌ؒͬͨͱͯ͠΋ɺ  ͋ͱͰݟ͔ͭΔΑ͏ͳόάͰ  ख໭Γ͠ͳ͚Ε͹શମతͳ  ࣌ؒ͸Ή͠ΖݮΔ ͭ·Γ

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Ͳ͜·ͰΛηϧϑνΣοΫ͢Δ͔ ͱ͸͍͑

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͜ͷ··ಥ͖ਐΉͱɺ͢΂ͯͷόάΛ  શ෦ࣗ෼Ͱݟ͚ͭΔ͜ͱʹͳͬͯ  ͠·Θͳ͍ͩΖ͏͔ʁ ͦΕ͸ਖ਼͍͠ํ਑ͳͷͩΖ͏͔ʁ

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ࣗ෼ͰશͯΛݟ͚ͭΔ ख໭Γ࠷খ

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ಈ࡞֬ೝ୲౰ͷਓͷ࣌ؒΛ  ༗ޮ׆༻Ͱ͖ͳ͍ ख໭Γ࠷খ ෼ۀ࠷খ

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࣮૷͚ͩʹઐ೦͢Δ ख໭Γ࠷খ ෼ۀ࠷খ ෼ۀ࠷େ

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։ൃ͕࣌ؒ৳ͼΔ ख໭Γ࠷খ ෼ۀ࠷খ ෼ۀ࠷େ ख໭Γ࠷େ

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ख໭Γ࠷খ ෼ۀ࠷খ ෼ۀ࠷େ ख໭Γ࠷େ ͲͪΒ΋ۃ୺ʹ͢Ε͹͕࣌ؒ૿͑ͯ͠·͏

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Ͳ͔͜ͷଥڠ఺Λ  બ͹ͳ͍ͱ͍͚ͳ͍ ͱ͍͏͜ͱ͸

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ීวతʹ࠷దͳ  ଥڠ఺͸ଘࡏ͠ͳ͍ ͔͠͠

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͢΂ͯͷෆ҆ͳߦΛҰ౓͸  ௨ա͢Δఔ౓Λ໨҆ʹͨ͠ ͦ͜ͰɺࢲͷࣄྫͰ͸

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ෆ҆ͳίʔυͷྫ struct Example { static func intToString(_ i: Int?) -> String { let x: Int! = i return "\(x)" } } ͨͱ͑͹ɺઌ΄Ͳͷ୹͍ίʔυͷதʹ΋  ෆ҆ͳ৔ॴ͕͋ͬͨ ࢲͷෆ҆ϙΠϯτ

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"\(x)"͸ͱ͖Ͳ͖৴༻ͷͳΒͳ͍ڍಈΛ͢Δ Int?ͩͱμϝʹͳΔͷ͸༗໊ͳͷͰ  ஌͍͕ͬͯͨɺInt!Ͱ΋ಉ͡Α͏ʹ  μϝͳͷ͔Ͳ͏͔֬৴Λ΋ͯͳ͔ͬͨ ͦ͏͍͏࣌͸ɺ--%#ͳͲͰ  ࣮ࡍʹಈ͔͔ͯ֬͠ΊΑ͏ --%#Ҏ֎ͷํ๏͸ϊ΢ϋ΢Ͱ΋঺հ

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w සൟʹ௨ա͢Δ෼ذʢ͜͜ʹόά͕͋Δͱਃ͠༁ͳ͍ʣ if (x < 0)ͷ෼ذͰxʹͲΜͳ΋ͷ͕དྷΔ͔  Θ͔Βͳ͍ͳΒɺগͳ͘ͱ΋ਖ਼ͱෛͷ྆ํΛࢼ͢ w ෼ذ৚݅ͷڥ໨ x < 0ͳΒڥ໨͸ɺ഑ྻ͸ۭͷͱ͖ʹڥ໨ʹͳΓ΍͍͢  DoubleͳΒ+0 -0 +infinity -infinity nanͳͲ w ཧղͰ͖͍ͯͳ͍ίϯϙʔωϯτͷར༻ ྫ͑͹ɺඪ४ϥΠϒϥϦͷ6*5BCMF7JFX͸࢖͍ํ͕  ͱͯ΋ෳࡶͳͷͰ͍ͭ΋ؒҧ͑ͯ͠·͏ ࢲͷ࠷ۙͷෆ҆ϙΠϯτ ൃ ද Ͱ ͸ ׂ Ѫ

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։ൃऀͷෆ҆͸ɺաڈʹࣗ਎͕౿Μͩ  όάͷܦݧΛ൓ө͍ͯ͠Δ͔Β ͔͠͠ɺͳͥෆ҆ͱ͍͏ج४ͳͷ͔ʁ

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ෆ҆ΛΞοϓσʔτ͠ଓ͚Δ͜ͱͰ  ͦͷݱ৔ʹదͨ͠ଥڠ఺΁͍͍͚ۙͮͯΔ ෆ͕࣮҆ࡍͷόάͷ܏޲ʹ  ݁ͼͭ͘Α͏ʹײ֮Λ  ߋ৽͠ଓ͚Α͏

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ϊ΢ϋ΢ͷ·ͱΊ ෆ͕҆ͳ͘ͳΔ·Ͱ  ηϧϑνΣοΫ͠Α͏ ෆ҆ͷਫ਼౓Λ্͍͛ͯ͜͏

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ಈ࡞֬ೝΛࣗಈԽ͢Δ ϊ΢ϋ΢ Φεεϝ౓ʜ

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ϊ΢ϋ΢Λଥڠͤͣʹ  ࣮ફ͢Δͷ͸͔ͳΓ೉͍͠ ͳͥͳΒɺෆ҆Λײ͡ΔՕॴ͸  ࢥͬͨΑΓଟ͍͔Β ͢Δͱ్தͰଥڠ͕ͪ͠ʹͳΓɺ  ख໭Γ͕ࢥͬͨΑΓ  ݮΒͳ͘ͳΔ

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Ͳ͜·Ͱ֬ೝ͢Ε͹҆৺Ͱ͖ΔͩΖ͏ʁ ཧ૝తͳൣғΛ૝૾ͯ͠ΈΑ͏

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ࢲʹͱͬͯͷཧ૝తͳಈ࡞֬ೝ Өڹ͞ΕΔίϯϙʔωϯτ  ͢΂ͯͬͯແཧͰ͸ʜʁ ͜Ε͸Ͱ͖ͦ͏ w ͦΕҎ֎ʹӨڹ͢Δίϯϙʔωϯτ΋  ͢΂ͯ֬ೝ͠ͳ͍ͱຊདྷ͸·͍ͣ w ࣮૷मਖ਼ͨ͠ίϯϙʔωϯτΛ  ֬৴Ͱ͖ΔϨϕϧ·Ͱ֬ೝ

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w ͕͔͔࣌ؒΓ͗͢Δ w Өڹ͢Δίϯϙʔωϯτͷಈ࡞֬ೝͷ  ࢓ํΛ͍֮͑ͯΔ͸͕ͣͳ͍ Өڹ͢ΔίϯϙʔωϯτΛ͢΂ͯ֬ೝ͢Δ  ͱ͖ͷΑ͋͘Δ໰୊఺ɿ ͋Εʁ͜ͷڍಈͰ͋ͬͯΔΜ͚ͩͬʜʁ ਖ਼͍͠Ҿ਺ͬͯͲ͏΍ͬͯ࡞ΔΜ͚ͩͬʁ

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ಈ࡞֬ೝΛࣗಈԽ͠Α͏ ͦ͏͍͏ͱ͖͸

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ίʔυͷಈ࡞֬ೝΛࣗಈԽ͢Δར఺ɿ w ܁Γฦ࣮͠ߦ͢Δίετ͕௿͍ͷͰ  ࣌ؒ͸ͦ͜·Ͱ͔͔Βͳ͘ͳΔ w ૢ࡞֬ೝͷखॱ͕ίʔυͱͯ͠  ࢒͞ΕΔͷͰ΍ΓํΛ๨Εͳ͍

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ಈ࡞֬ೝΛࣗಈԽ͢Δͭͷํ๏ɿ ಈ࡞֬ೝͷͨΊͷඪ४ϥΠϒϥϦΛ  ࢖ͬͯಈ࡞֬ೝ "QQ%FMFHBUFܦ༝Ͱಈ࡞֬ೝ " #

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ϊ΢ϋ΢ʵ" "QQ%FMFHBUFͰಈ࡞֬ೝ ಈ࡞֬ೝͷίʔυΛॻ͘ ৽͍͠4DIFNFΛ࡞੒͢Δ "QQ%FMFHBUFͰͷ  4DIFNFͷͱ͖͚ͩΛ  ࣮ߦ͢ΔΑ͏ʹ͢Δ ͨͩܽ͠఺͕ଟ͍ͷͰɺൃදͰ͸ׂѪ͠·͢

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#if DEBUG import Foundation let debugTargets: [String: () -> Void] = [ "intToString": { let string = Example.intToString(42) guard string == "48" else { fatalError("intToString(42) ͕ \"42\" Λฦ͞ͳ͔ͬͨ") } }, ] func debugAll() { let targets = Array(debugTargets.values) DispatchQueue.concurrentPerform(iterations: targets.count) { index in targets[index]() } } #endif ಈ࡞֬ೝͷίʔυΛ·ͱΊΔ%JDUJPOBSZΛ࡞੒͢Δ ൃ ද Ͱ ͸ ׂ Ѫ

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#if DEBUG import Foundation let debugTargets: [String: () -> Void] = [ "intToString": { let string = Example.intToString(42) guard string == "42" else { fatalError("intToString(42) ͕ \"42\" Λฦ͞ͳ͔ͬͨ") } }, ] func debugAll() { let targets = Array(debugTargets.values) DispatchQueue.concurrentPerform(iterations: targets.count) { index in targets[index]() } } #endif ಈ࡞֬ೝͷίʔυΛॻ͘ ͜ͷίʔυ͸ɺintToString(42)ͷ  ݁Ռ͕"42"ʹͳΔ͜ͱΛ֬ೝ͍ͯ͠Δ ൃ ද Ͱ ͸ ׂ Ѫ

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#if DEBUG import Foundation let debugTargets: [String: () -> Void] = [ "intToString": { let string = Example.intToString(42) guard string == "48" else { fatalError("intToString(42) ͕ \"42\" Λฦ͞ͳ͔ͬͨ") } }, ] func debugAll() { let targets = Array(debugTargets.values) DispatchQueue.concurrentPerform(iterations: targets.count) { index in targets[index]() } } #endif ͢΂ͯͷಈ࡞֬ೝίʔυΛ࣮ߦ͢Δ  EFCVH"MMؔ਺Λ࣮૷͢Δ ൃ ද Ͱ ͸ ׂ Ѫ

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৽͍͠4DIFNFΛ࡞੒͢Δ΍Γํ 9DPEF ᶃ4DIFNFΛ࡞੒ ᶄద౰ͳ໊લΛ͚ͭΔ ൃ ද Ͱ ͸ ׂ Ѫ

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৽͍͠4DIFNFΛ࡞੒͢Δ΍Γํ ᶃϏϧυઃఆΛ։͘ ᶆద౰ͳ໊લΛ͚ͭΔ "QQ$PEF ᶅ"QQMJDBUJPOΛࢦఆ ᶄ4DIFNFΛ࡞੒ ൃ ද Ͱ ͸ ׂ Ѫ

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؀ڥม਺Λ௥Ճ͢Δ΍Γํ 9DPEF ᶃ4DIFNFΛฤू ᶄ؀ڥม਺Λ௥Ճ "QQ$PEF ᶃ؀ڥม਺Λฤू ᶄ؀ڥม਺Λ௥Ճ ൃ ද Ͱ ͸ ׂ Ѫ

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؀ڥઃఆͷ஋Λઃఆ͢Δ΍Γํ 9DPEF ᶃAUTO_DEBUG=1Λઃఆ "QQ$PEF ᶃAUTO_DEBUG=1Λઃఆ ൃ ද Ͱ ͸ ׂ Ѫ

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@UIApplicationMain class AppDelegate: UIResponder, UIApplicationDelegate { var window: UIWindow? func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: #if DEBUG if ProcessInfo.processInfo.environment["AUTO_DEBUG"] == "1" { debugAll() return true } #endif // ... return true } } "QQ%FMFHBUFʹ؀ڥม਺ͷ෼ذΛ௥Ճ AUTO_DEBUG=1ͷͱ͖ͷΈɺ  ઌ΄ͲͷdebugAllΛ࣮ߦ ൃ ද Ͱ ͸ ׂ Ѫ

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ΞϓϦΛ࣮ߦͯ͠ΈΑ͏ ͦΕͰ͸ ൃ ද Ͱ ͸ ׂ Ѫ

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ΞϓϦΛ࣮ߦ͢Δͱಈ࡞֬ೝͰ͖Δ 9DPEF Ͳ͜Ͱࣦഊ͔ͨ͠Θ͔Δ ࣦഊͨ͠ཧ༝͕Θ͔Δ ൃ ද Ͱ ͸ ׂ Ѫ

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ΞϓϦΛ࣮ߦ͢Δͱಈ࡞֬ೝͰ͖Δ "QQ$PEF Ͳ͜Ͱࣦഊ͔ͨ͠Θ͔Δ ࣦഊͨ͠ཧ༝͕Θ͔Δ ൃ ද Ͱ ͸ ׂ Ѫ

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5*14 ࢦఆͨ͠ίʔυ͚ͩಈ࡞֬ೝ ݸผͷಈ࡞֬ೝ͚ͩΛ࣮ߦ͍ͨ͜͠ͱ͸Α͋͘Δ ͦ͏͍͏৔߹͸ɺ--%#͔Β໊લΛࢦఆͯ͠ݸผʹ  ಈ࡞֬ೝΛ࣮ߦͰ͖Δ ಈ࡞֬ೝͷίʔυΛ഑ྻͰ͸ͳ͘%JDUJPOBSZʹ  ֨ೲͨ͠ͷ͸͜Ε͕໨త (lldb) po debugTargets["intToString"]!() Fatal error: intToString(42) ͕ "42" Λฦ͞ͳ͔ͬͨ: ൃ ද Ͱ ͸ ׂ Ѫ

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"QQ%FMFHBUFͷํ๏ͷ໰୊఺ɿ w ෳ਺ͷಈ࡞֬ೝ͕ࣦഊ͢Δͱɺઌʹ  ࣮ߦ͞Εͨํ͔͠೺ѲͰ͖ͳ͍ w fatalErrorΛprint΁ม͑Ε͹  ෳ਺ͷࣦഊΛ೺ѲͰ͖ΔΑ͏ʹ  ͳΔ͕ɺࠓ౓͸ࣦഊͨ͠ࡍʹ*%&͕  δϟϯϓͯ͘͠Εͳ͍ͷͰෆศ ͜ΕΒͷ໰୊͸ඪ४ϥΠϒϥϦͰղܾͰ͖·͢

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ϊ΢ϋ΢ʵ# ඪ४ϥΠϒϥϦͰಈ࡞֬ೝ ৽͍͠5BSHFUΛ࡞੒͢Δ ಈ࡞֬ೝͷίʔυΛॻ͘ ಈ࡞֬ೝͷίʔυͷ5BSHFUΛ  ઌ΄Ͳ࡞੒ͨ͠΋ͷʹ͢Δ J04ʹ͸ಈ࡞֬ೝ༻ͷඪ४ϥΠϒϥϦʮ9$5FTUʯ͕  ༻ҙ͞Ε͍ͯΔ ͜ΕͰ"QQ%FMFHBUFʹ͋ͬͨෳ਺ࣦഊͨ͠ͱ͖ͷ  ໰୊ΛղܾͰ͖Δ͕ɺ࣍ͷΑ͏ͳϏϧυઃఆ͕ඞཁɿ

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Ϗϧυઃఆͷ΍Γํ 9DPEF ᶃ5BSHFUΛ৽ن࡞੒ ᶅඞཁ߲໨Λهೖ ᶄJ046OJU5FTUJOH#VOEMFΛબ୒ ൃ ද Ͱ ͸ ׂ Ѫ

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ᶃ1SPKFDU4FUUJOHTΛ։͘ ᶄ5BSHFUΛ௥Ճ ᶅJ046OJU5FTUJOH#VOEMFΛબ୒ Ϗϧυઃఆͷ΍Γํ "QQ$PEF ൃ ද Ͱ ͸ ׂ Ѫ

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Ϗϧυઃఆͷ΍Γํ 9DPEF ᶆ5FTUJOHΛ࣮ߦ ᶇ5FTU4VDDFFEFE͕දࣔ͞ΕΕ͹0, ൃ ද Ͱ ͸ ׂ Ѫ

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ᶇϏϧυઃఆΛฤू ᶈ4DIFNFΛ௥Ճ ᶆඞཁ߲໨Λهೖ Ϗϧυઃఆͷ΍Γํ "QQ$PEF ൃ ද Ͱ ͸ ׂ Ѫ

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ᶌ"MM5FTUT1BTTFEͱදࣔ͞ΕΕ͹0, ᶉ9$5FTUΛબ୒ ᶊద౰ͳ໊લΛ͚ͭΔ ᶋ࡞੒ͨ͠4DIFNFΛ࣮ߦ Ϗϧυઃఆͷ΍Γํ "QQ$PEF ൃ ද Ͱ ͸ ׂ Ѫ

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͜ΕͰಈ࡞֬ೝ༻ͷ5BSHFUΛ࡞੒Ͱ͖ͨ

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9DPEF ᶃ࡞੒ͨ͠5BSHFUΛબ୒ "QQ$PEF ൃ ද Ͱ ͸ ׂ Ѫ ᶃ.BOBHF5BSHFUTΛબ୒ ᶄ࡞੒ͨ͠5BSHFUΛબ୒ 5BSHFUͷࢦఆͷ΍Γํ

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import XCTest @testable import IOSDC2018Debugging class ExampleTest: XCTestCase { func testIntToString() { let str = Example.intToString(42) XCTAssertEqual(str, "42") } } ඪ४ϥΠϒϥϦ9$5FTUΛಡΈࠐΉ ΞϓϦͷίʔυ͸ผͷ5BSHFUͳͷͰ  ࢖͏ࡍʹ͸import͕ඞཁ ී௨ʹimport͢Δͱpublicͷ΋ͷ͔͠  ݟ͑ͳ͘ͳͬͯ͠·͏͕ɺ@testableΛͭ ͚Δͱinternal·Ͱݟ͑ΔΑ͏ʹͳΔ

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import XCTest @testable import IOSDC2018Debugging class ExampleTest: XCTestCase { func testIntToString() { let str = Example.intToString(42) XCTAssertEqual(str, "42") } } ಈ࡞֬ೝͷίʔυ͸XCTestCaseͱ͍͏  ΫϥεͰάϧʔϐϯάͰ͖ΔΑ͏ʹͳ͍ͬͯΔ ಈ࡞֬ೝͷίʔυΛॻ͘৔߹ʹ͸ɺ֬ೝର৅ͷ  Ϋϥε΍ؔ਺୯ҐͰXCTestCaseΛ෼͚Δͱ  ಈ࡞֬ೝͷ݁Ռ͕Θ͔Γ΍͘͢ͳΔ

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import XCTest @testable import IOSDC2018Debugging class ExampleTest: XCTestCase { func testIntToString() { let str = Example.intToString(42) XCTAssertEqual(str, "42") } } ࣮ࡍͷಈ࡞֬ೝͷίʔυ͸ɺΠϯελϯεϝιουͱ࣮ͯ͠૷͢Δ ͜ͷϝιουͷ໊લ͸ઌ಄ʹtestͱ͚ͭͳ͍ͱ࣮ߦ͞Εͳ͍ͷͰ஫ҙ

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import XCTest @testable import IOSDC2018Debugging class ExampleTest: XCTestCase { func testIntToString() { let str = Example.intToString(42) XCTAssertEqual(str, "42") } } ਖ਼ޡ൑ఆ͸XCTAssertEqualͳͲͷؔ਺Λ࢖͏ ͜ͷؔ਺͸ɺͭͷҾ਺͕౳͘͠ͳ͍ͱɺ  ಈ࡞֬ೝΛࣦഊͱΈͳ͢Α͏ʹͳ͍ͬͯΔ

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ඪ४ϥΠϒϥϦΛ࢖ͬͨ݁Ռը໘ 9DPEF Ͳ͜Ͱࣦഊ͔ͨ͠Θ͔Δ ࣦഊͨ͠ཧ༝΋Θ͔Δ ෳ਺ͷࣦഊ͕  ҰཡͰݟΒΕΔ

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"QQ$PEF Ͳ͜Ͱࣦഊ͔ͨ͠Θ͔Δ ෳ਺ͷࣦഊ͕  ҰཡͰݟΒΕΔ ࣦഊͨ͠ཧ༝΋Θ͔Δ ඪ४ϥΠϒϥϦΛ࢖ͬͨ݁Ռը໘ ൃ ද Ͱ ͸ ׂ Ѫ

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ඪ४ϥΠϒϥϦͷํ๏ͷ໰୊఺ɿ w Ϗϧυઃఆ͕յΕ͍ͯΔͱɺ௚͢·Ͱ  ಈ࡞֬ೝͷίʔυΛ࣮ߦͰ͖ͳ͍ w ઃఆΛ͙͢ʹ͸௚ͤͳͦ͞͏ͳΒɺ  "QQ%FMFHBUFͷํ๏ΛҰ࣌తʹ  ࢖͏ͷ΋༗ޮͳखஈ ͋Γ͕ͪͳͷ͕  Կ͔ͷϥΠϒϥϦͷ  4FBSDI1BUITͷ  ઃఆ΋Ε

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ϊ΢ϋ΢ͷ·ͱΊ ಈ࡞֬ೝΛࣗಈԽ͢Δͭͷํ๏ɿ ಈ࡞֬ೝͷͨΊͷඪ४ϥΠϒϥϦΛ  ࢖ͬͯಈ࡞֬ೝ "QQ%FMFHBUFܦ༝Ͱಈ࡞֬ೝ " # #ͷํ͕Φεεϝ͕ͩɺ͙͢ʹ͸೉ͦ͠͏ͳΒҰ࣌తʹ"Ͱ΋0,ʂ

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ؒҧ͍ʹ͍͘ઃܭʹ͢Δ ϊ΢ϋ΢ ൃ ද Ͱ ͸ ׂ Ѫ Φεεϝ౓ʜ

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σόοάΛͦ΋ͦ΋͍Βͳ͍Α͏ʹͰ͖ΔͳΒ  ͦΕ͕Ұ൪࣌ؒΛ୹ॖͰ͖Δ ྫͱͯ࣍͠ͷΑ͏ͳ޻෉Λ঺հ͢Δɿ Կ͔ͷ*%Λ௚઀ͷ*OU΍4USJOHʹ͠ͳ͍ ίʔυΛࣗಈੜ੒͢Δ " # ൃ ද Ͱ ͸ ׂ Ѫ

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ϊ΢ϋ΢ʵ" *%ΛݸผͷTUSVDUʹ͢Δ ΞϓϦΛ࡞੒͍ͯ͠Δͱෳ਺ͷछྨͷ*%Λ  औΓѻ͏͜ͱ͕ଟ͍ʢ6TFS*%΍$PNNFOU*%ͳͲʣ ͜ͷ*%ΛऔΓҧ͑ͯॲཧͯ͠͠·ͬͨΓ͢Δͱɺ  ݪҼಛఆ͕େมͳ໘౗ͳόάΛੜΈग़͠΍͍͢ ͜͏͍͏࣌͸ɺࢥ͍੾ͬͯݸผͷ  TUSVDU΁෼͚ͯ͠·͓͏ ൃ ද Ͱ ͸ ׂ Ѫ

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*%ΛݸผͷTUSVDU΁෼͚ͨྫ // BAD: औΓҧ͑ͯ΋ؾ͖ͮͮΒ͍ let userID: Int = 1234 let productID: Int = 5678 // GOOD: औΓҧ͑ΔͱίϯύΠϧΤϥʔʹͳΔ let userID = UserID(number: 1234) let productID = ProductID(number: 5678) ൃ ද Ͱ ͸ ׂ Ѫ

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ϊ΢ϋ΢ʵ# ίʔυΛࣗಈੜ੒͢Δ Α͋͘ΔόάͷݪҼʹ6*4UPSZCPBSE΍6*/JCͷ  ໊લࢦఆͷϛε΍ϦωʔϜ๨Ε͕͋Δ ͜ΕΒͷίʔυΛࣗಈੜ੒ͯ͘͠ΕΔπʔϧ͕  ͍͔ͭ͋͘ΔͷͰɺͲΕ͔Λ࢖͑͹͜ͷछͷόάΛ  ࣄલʹ༧๷Ͱ͖Δɿ w HJUIVCDPNNBDDBJO3TXJGU w HJUIVCDPN4XJGU(FO4XJGU(FO ൃ ද Ͱ ͸ ׂ Ѫ

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ϊ΢ϋ΢ͷ·ͱΊ ͜ͷछͷςΫχοΫ͸ແ਺ʹ͋ΔͨΊɺ  ঺հͨ͠ͷ͸͘͝Ұ෦ Կ͔ͷ*%Λ௚઀ͷ*OU΍  4USJOHʹ͠ͳ͍ ίʔυΛࣗಈੜ੒͢Δ " # ൃ ද Ͱ ͸ ׂ Ѫ

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վળલͱͷൺֱ ײ͍ͯͩ͘͡͞

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్த·Ͱ͏·͍͘͘ͷʹ  కΊ੾Γʹؒʹ߹Θͳ͍

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ෆ҆ۦಈνΣοΫͰख໭Γ͕  গͳ͘ͳͬͨͷͰɺ༧ఆ௨Γʹ  ਐΉΑ͏ʹͳͬͨʂ

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కΊ੾Γ͕ഭͬͯ͘Δͱ  ಈ࡞֬ೝΛ͖͠Εͳͯ͘  େৎ෉ͩͱ৴͡Δ͔͠ͳ͍

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ಈ࡞֬ೝͷࣗಈԽͰɺӨڹൣғͷ  ಈ࡞֬ೝ·ͰͰ͖ΔΑ͏ʹͳͬͨʂ

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4JNVMBUPSΆͪΆͪʹ  ͕͔͔࣌ؒͬͯΠϥΠϥ͢Δ

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ಈ࡞֬ೝͷࣗಈԽͰ  ΆͪΆ͍ͪΒͳ͘ͳͬͨʂ

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͜͏͍͏खॱ·Ͱ͍࣋ͬͯͬͨ݁Ռɺ  ։ൃ଎౓͕ʹͳͬͯ·ͨ͠ څྉ্͕͕ͬͨ  ,VOJXBL ࢲͷࣄྫͰ͸

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࣮ࡍ͸͜Μͳʹ  ͢ΜͳΓ͍͔ͳ͍ Τ ο ʂ ʁ

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ࣗಈԽͷ୩໰୊ ཱͪ͸͔ͩΔ

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ϊ΢ϋ΢dͷ࣮ફ͕ͱͯ΋೉͍͠ ͜ͷ͋ͱྫΛग़͕͢ɺࣗಈͰͷ  ಈ࡞֬ೝ͸༧૝֎ʹͰ͖ͳ͍΋ͷ ࣮͸ʜ

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import UIKit class ExampleViewController: UIViewController { @IBOutlet weak var label: UILabel! @IBAction func buttonTapped(_ sender: Any) { APIClient.shared.get(type: User.self, url: URLs.getSomething) { [weak self] (user, error) in guard let `self` = self else { return } if let error = error { dump(error) let alertViewController = UIAlertController( title: "Τϥʔ͕ൃੜ͠·ͨ͠", message: nil, preferredStyle: .alert ) alertViewController.addAction(UIAlertAction(title: "OK", style: .default)) self.present(alertViewController, animated: true) return } self.label.text = "Hello, \(user!.name)!" } } } ಈ࡞֬ೝͷࣗಈԽ͕͔ͳΓ೉͍͠ྫ

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͜Μͳ୯७ͳ7JFX$POUSPMMFSͰ΋ɺ ಈ࡞֬ೝΛࣗಈԽ͢ΔͨΊͷ஌͕ࣝ  ͔ͳΓଟ͍ͱ͍͏͜ͱΛײ͡Ͱ͍ͩ͘͞

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import XCTest import UIKit @testable import IOSDC2018Debugging class ExampleViewControllerTest: XCTestCase { func testMyNameIsVisible() { let viewController = UIStoryboard( name: "ExampleViewController", bundle: Bundle(for: ExampleViewController.self) ).instantiateInitialViewController() as! ExampleViewController let dummySender = NSObject() viewController.buttonTapped(dummySender) XCTAssertTrue(viewController.label?.text?.contains("Kuniwak")) } } ͱΓ͋͑ͣಈ࡞֬ೝͷίʔυΛॻ͍ͯΈͨ ൃ ද Ͱ ͸ ׂ Ѫ

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import XCTest import UIKit @testable import IOSDC2018Debugging class ExampleViewControllerTest: XCTestCase { func testMyNameIsVisible() { let viewController = UIStoryboard( name: "ExampleViewController", bundle: Bundle(for: ExampleViewController.self) ).instantiateInitialViewController() as! ExampleViewController let dummySender = NSObject() viewController.buttonTapped(dummySender) XCTAssertTrue(viewController.label!.text!.contains("Kuniwak")) } } 4UPSZCPBSE͔Β7JFX$POUSPMMFSΛॳظԽ ൃ ද Ͱ ͸ ׂ Ѫ

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import XCTest import UIKit @testable import IOSDC2018Debugging class ExampleViewControllerTest: XCTestCase { func testMyNameIsVisible() { let viewController = UIStoryboard( name: "ExampleViewController", bundle: Bundle(for: ExampleViewController.self) ).instantiateInitialViewController() as! ExampleViewController let dummySender = NSObject() viewController.buttonTapped(dummySender) XCTAssertTrue(viewController.label!.text!.contains("Kuniwak")) } } @IBActionΛ࣮ߦͯ͠ϘλϯλοϓΛ࠶ݱ ൃ ද Ͱ ͸ ׂ Ѫ

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import XCTest import UIKit @testable import IOSDC2018Debugging class ExampleViewControllerTest: XCTestCase { func testMyNameIsVisible() { let viewController = UIStoryboard( name: "ExampleViewController", bundle: Bundle(for: ExampleViewController.self) ).instantiateInitialViewController() as! ExampleViewController let dummySender = NSObject() viewController.buttonTapped(dummySender) XCTAssertTrue(viewController.label!.text!.contains("Kuniwak")) } } UILabel͕Ϣʔβʔ໊ʹมΘͬͨ͜ͱΛ֬ೝ ൃ ද Ͱ ͸ ׂ Ѫ

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import XCTest import UIKit @testable import IOSDC2018Debugging class ExampleViewControllerTest: XCTestCase { func testMyNameIsVisible() { let viewController = UIStoryboard( name: "ExampleViewController", bundle: Bundle(for: ExampleViewController.self) ).instantiateInitialViewController() as! ExampleViewController let dummySender = NSObject() viewController.buttonTapped(dummySender) XCTAssertTrue(viewController.label!.text!.contains("Kuniwak")) } } viewController.label͕nil ൃ ද Ͱ ͸ ׂ Ѫ

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import XCTest import UIKit @testable import IOSDC2018Debugging class ExampleViewControllerTest: XCTestCase { func testMyNameIsVisible() { let viewController = UIStoryboard( name: "ExampleViewController", bundle: Bundle(for: ExampleViewController.self) ).instantiateInitialViewController() as! ExampleViewController let dummySender = NSObject() viewController.buttonTapped(dummySender) XCTAssertTrue(viewController.label!.text!.contains("Kuniwak")) } } viewDidLoadΛ଴ͬͯͳ͍ͷͰɺ  ·ͩUILabel͕ଘࡏ͍ͯ͠ͳ͍ ݪҼɿ ൃ ද Ͱ ͸ ׂ Ѫ

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class ExampleViewController: UIViewController { private var actions: ExampleViewsAction? @IBOutlet weak var label: UILabel! override func viewDidLoad() { super.viewDidLoad() self.actions = ExampleViewsAction( label: self.label ) } @IBAction func buttonTapped(_ sender: Any) { self.actions?.buttonDidTapped() } } viewDidLoadҎ߱ͷॲཧΛผͷΫϥεʹ੾Γग़͢ ʢͳͥ͜͏͢Δͷ͔͸΋͏গ͠ޙͰΘ͔Γ·͢ʣ ॏཁͳͷ͸ɺviewDidLoadͰॳظԽ͞Εͨ  UILabelΛ੾Γग़ͨ͠Ϋϥεʹ౉͓ͯ͘͜͠ͱ ൃ ද Ͱ ͸ ׂ Ѫ

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class ExampleViewController: UIViewController { private var actions: ExampleViewsAction? @IBOutlet weak var label: UILabel! override func viewDidLoad() { super.viewDidLoad() self.actions = ExampleViewsAction( label: self.label ) } @IBAction func buttonTapped(_ sender: Any) { self.actions?.buttonDidTapped() } } Ϙλϯͷλοϓॲཧ͸  @IBActionΛԣྲྀ͢͠Ε͹0, ൃ ද Ͱ ͸ ׂ Ѫ

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import UIKit class ExampleViewsAction { private let label: UILabel init(label: UILabel) { self.label = label } func buttonDidTapped() { APIClient.shared.get(type: User.self, url: URLs.getSomething) { [weak self] (user, error) in guard let `self` = self else { return } if let error = error { // লུ self.present(alertViewController, animated: true) return } self.label.text = "Hello, \(user!.name)!" } } } 7JFX$POUSPMMFS͔Β෼཭͞Εͨίʔυ ൃ ද Ͱ ͸ ׂ Ѫ

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import UIKit class ExampleViewsAction { private let label: UILabel init(label: UILabel) { self.label = label } func buttonDidTapped() { APIClient.shared.get(type: User.self, url: URLs.getSomething) { [weak self] (user, error) in guard let `self` = self else { return } if let error = error { // লུ self.present(alertViewController, animated: true) return } self.label.text = "Hello, \(user!.name)!" } } } ஫ɿ͜ͷ໊લ͸ద౰ͳͷͰɺ࣮ࡍ͸֤ʑͷ  ΞʔΩςΫνϟʹԊ໋໊ͬͨʹ͍ͯͩ͘͠͞ ൃ ද Ͱ ͸ ׂ Ѫ

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import UIKit class ExampleViewsAction { private let label: UILabel init(label: UILabel) { self.label = label } func buttonDidTapped() { APIClient.shared.get(type: User.self, url: URLs.getSomething) { [weak self] (user, error) in guard let `self` = self else { return } if let error = error { // লུ self.present(alertViewController, animated: true) return } self.label.text = "Hello, \(user!.name)!" } } } self.present͕ଘࡏ͠ͳ͍ ʢ͜Ε͸গ͠ޙͰमਖ਼͢Δʣ ൃ ද Ͱ ͸ ׂ Ѫ

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मਖ਼ޙͷಈ࡞֬ೝίʔυ import XCTest import UIKit @testable import IOSDC2018Debugging class ExampleViewControllerTest: XCTestCase { func testMyNameIsVisible() { let label = UILabel() let actions = ExampleViewsAction(label: label) actions.buttonDidTapped() XCTAssertTrue(label.text?.contains("Kuniwak")) } } ൃ ද Ͱ ͸ ׂ Ѫ

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import XCTest import UIKit @testable import IOSDC2018Debugging class ExampleViewControllerTest: XCTestCase { func testMyNameIsVisible() { let label = UILabel() let actions = ExampleViewsAction(label: label) actions.buttonDidTapped() XCTAssertTrue(label.text?.contains("Kuniwak")) } } 7JFX$POUSPMMFSͰ͸ͳ͘ɺ  ੾Γग़ͨ͠ΫϥεͷํΛ  ಈ࡞֬ೝ͢ΔΑ͏ʹ͢Δ ൃ ද Ͱ ͸ ׂ Ѫ

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import XCTest import UIKit @testable import IOSDC2018Debugging class ExampleViewControllerTest: XCTestCase { func testMyNameIsVisible() { let label = UILabel() let actions = ExampleViewsAction(label: label) actions.buttonDidTapped() XCTAssertTrue(label.text?.contains("Kuniwak")) } } @IBActionͰλοϓΛ࠶ݱ͢Δ෦෼͸ ੾Γग़ͨ͠Ϋϥεͷํͷϝιουͷ࣮ߦͰ୅ସ ൃ ද Ͱ ͸ ׂ Ѫ

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import XCTest import UIKit @testable import IOSDC2018Debugging class ExampleViewControllerTest: XCTestCase { func testMyNameIsVisible() { let label = UILabel() let actions = ExampleViewsAction(label: label) actions.buttonDidTapped() XCTAssertTrue(label.text?.contains("Kuniwak")) } } ઌ΄Ͳ౉ͨ͠UILabelͷ಺༰͕  มΘ͍ͬͯΔ͔͔֬ΊΒΕ͍ͯΔ ͜͏͢Δ͜ͱͰUILabel͕·ͩ  ଘࡏ͠ͳ͍໰୊ΛղܾͰ͖Δ ൃ ද Ͱ ͸ ׂ Ѫ

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import UIKit class ExampleViewsAction { private let label: UILabel init(label: UILabel) { self.label = label } func buttonDidTapped() { APIClient.shared.get(type: User.self, url: URLs.getSomething) { [weak self] (user, error) in guard let `self` = self else { return } if let error = error { // লུ self.present(alertViewController, animated: true) return } self.label.text = "Hello, \(user!.name)!" } } } self.present͕ଘࡏ͠ͳ͍ͷͰ  ·ͩϏϧυ͕௨Βͳ͍ 7JFX$POUSPMMFS͔Β෼཭͞Εͨίʔυ ൃ ද Ͱ ͸ ׂ Ѫ

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import UIKit class ModalPresenter { private weak var viewController: UIViewController? init(willPresentOn viewController: UIViewController) { self.viewController = viewController } func present(_ viewController: UIViewController, animated: Bool) { self.viewController?.present(viewController, animated: animated) } } self.present͕ଘࡏ͠ͳ͍໰୊ͷղܾ ൃ ද Ͱ ͸ ׂ Ѫ

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import UIKit class ModalPresenter { private weak var viewController: UIViewController? init(willPresentOn viewController: UIViewController) { self.viewController = viewController } func present(_ viewController: UIViewController, animated: Bool) { self.viewController?.present(viewController, animated: animated) } } 7JFX$POUSPMMFSͷpresentΛ  ผͷΫϥεͰ΋ୟ͚ΔΑ͏ʹ͢ΔΫϥε ൃ ද Ͱ ͸ ׂ Ѫ

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import UIKit class ModalPresenter { private weak var viewController: UIViewController? init(willPresentOn viewController: UIViewController) { self.viewController = viewController } func present(_ viewController: UIViewController, animated: Bool) { self.viewController?.present(viewController, animated: animated) } } presentʹ࢖͏7JFX$POUSPMMFSΛ಺෦ʹอ࣋͢Δ  ʢϝϞϦϦʔΫΛආ͚ΔͨΊʹweakʹ͢Δʣ ൃ ද Ͱ ͸ ׂ Ѫ

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import UIKit class ModalPresenter { private weak var viewController: UIViewController? init(willPresentOn viewController: UIViewController) { self.viewController = viewController } func present(_ viewController: UIViewController, animated: Bool) { self.viewController?.present(viewController, animated: animated) } } ͜ͷΫϥεͷpresentΛ࣮ߦ͢Δͱɺอ͍࣋ͯͨ͠  7JFX$POUSPMMFSͷpresent͕࣮ߦ͞ΕΔ ൃ ද Ͱ ͸ ׂ Ѫ

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import UIKit class ExampleViewsAction { private let label: UILabel private let modalPresenter: ModalPresenter init(label: UILabel, modalPresenter: ModalPresenter) { self.label = label self.modalPresenter = modalPresenter } func buttonDidTapped() { APIClient.shared.get(type: User.self, url: URLs.getSomething) { [weak self] (user, error) in guard let `self` = self else { return } if let error = error { // লུ self.modalPresenter.present(alertViewController, animated: true) return } self.label.text = "Hello, \(user!.name)!" } } } मਖ਼ޙͷ7JFX$POUSPMMFS͔Β෼཭͞Εͨίʔυ ൃ ද Ͱ ͸ ׂ Ѫ

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import UIKit class ExampleViewsAction { private let label: UILabel private let modalPresenter: ModalPresenter init(label: UILabel, modalPresenter: ModalPresenter) { self.label = label self.modalPresenter = modalPresenter } func buttonDidTapped() { APIClient.shared.get(type: User.self, url: URLs.getSomething) { [weak self] (user, error) in guard let `self` = self else { return } if let error = error { // লུ self.modalPresenter.present(alertViewController, animated: true) return } self.label.text = "Hello, \(user!.name)!" } } } 7JFX$POUSPMMFS͔ΒUILabelͱҰॹʹ  ઌ΄ͲͷModalPresenterΛड͚औΔ ൃ ද Ͱ ͸ ׂ Ѫ

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import UIKit class ExampleViewsAction { private let label: UILabel private let modalPresenter: ModalPresenter init(label: UILabel, modalPresenter: ModalPresenter) { self.label = label self.modalPresenter = modalPresenter } func buttonDidTapped() { APIClient.shared.get(type: User.self, url: URLs.getSomething) { [weak self] (user, error) in guard let `self` = self else { return } if let error = error { // লུ self.modalPresenter.present(alertViewController, animated: true) return } self.label.text = "Hello, \(user!.name)!" } } } self.presentΛModalPresenterͷ  presentͷݺͼग़͠΁ม͑Δ ൃ ද Ͱ ͸ ׂ Ѫ

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Ұൠతʹɺ"1*͕ฦ͖ͬͯͨޙͷ7JFXͷ  ߋ৽ͷ׬ྃΛݕ஌͢Δͷ͸೉͍͠ ྫ͑͹ɺ࣍ͷίʔυͰ7JFXͷߋ৽͕  ׬ྃ͢Δͷ͸"ͱ#ͷͲͪΒʁ if isAdminMode { callAdminAPI { [weak self] (admin, error) in guard let `self` = self else { return } self.label.color = admin != nil ? .red : .blue } } callUserAPI { [weak self] (user, error) in guard let `self` = self else { return } self.label.text = user.name } " # ൃ ද Ͱ ͸ ׂ Ѫ

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ਖ਼ղ͸ɺʮ"ͱ#ͷͲͪΒ΋͋Γ͑Δʯ ͭͷ"1*ͷฦͬͯ͘ΔλΠϛϯάʹΑͬͯ  "ͷͱ͖΋͋Ε͹#ͷͱ͖΋͋Δ if isAdminMode { callAdminAPI { [weak self] (admin, error) in guard let `self` = self else { return } self.label.color = admin != nil ? .red : .blue } } callUserAPI { [weak self] (user, error) in guard let `self` = self else { return } self.label.text = user.name } callAdminAPI͕  ޙʹ׬ྃ͢Ε͹" callUserAPI͕  ޙʹ׬ྃ͢Ε͹# ൃ ද Ͱ ͸ ׂ Ѫ

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ݟͨ໨ͷߋ৽Λ"1*ͳͲͷཪଆͷࣄ৘͔Β੾Γ཭͢ͱղܾͰ͖Δ ݟͨ໨Λ࢘ΔίϯϙʔωϯτʹදࣔΛ  ҰׅͰ൓ө͢Δ͚ͩͷϝιουΛੜ΍͢ "1*ݺͼग़͠౳Ͱ͢΂ͯͷ৘ใ͕ἧͬͨΒ  ϝιουΛݺͼग़͢ઃܭن໿ʹ͢Δ ͜͏͍͏ͱ͖͸ func apply(userName: String, isAdmin: Bool) { self.label.text = userName self.label.backgroundColor = isAdmin ? .red : .black } // API ͷ྆ํ͕ฦ͖͔ͬͯͯΒදࣔΛ൓ө͢Δ myView.apply(userName: "Kuniwak", isAdmin: false) ൃ ද Ͱ ͸ ׂ Ѫ

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ݟͨ໨ͱཪଆͷ෼཭ͷͨΊͷ४උ protocol ExampleModelDelegate: class { func apply(state: ExampleModelState) } enum ExampleModelState: Equatable { case success(userName: String) case failure(error: ExampleModelUpdateError) } enum ExampleModelUpdateError: Error, Equatable { case unspecified(debugInfo: String) } ൃ ද Ͱ ͸ ׂ Ѫ

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protocol ExampleModelDelegate: class { func apply(state: ExampleModelState) } enum ExampleModelState: Equatable { case success(userName: String) case failure(error: ExampleModelUpdateError) } enum ExampleModelUpdateError: Error, Equatable { case unspecified(debugInfo: String) } ཪଆͷ࢓ࣄͷ४උ͕੔ͬͨͱ͖ʹୟ͍ͯ΋Β͏  ݟͨ໨ͷҰׅ൓өϝιου ൃ ද Ͱ ͸ ׂ Ѫ

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protocol ExampleModelDelegate: class { func apply(state: ExampleModelState) } enum ExampleModelState: Equatable { case success(userName: String) case failure(error: ExampleModelUpdateError) } enum ExampleModelUpdateError: Error, Equatable { case unspecified(debugInfo: String) } ཪଆͷ࠷ऴతͳ݁Ռ͸ɺ w ੒ޭͯ͠userName w ࣦഊͯ͠error ͷͲͪΒ͔ͳͷͰɺFOVNͰදݱ ൃ ද Ͱ ͸ ׂ Ѫ

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protocol ExampleModelDelegate: class { func apply(state: ExampleModelState) } enum ExampleModelState: Equatable { case success(userName: String) case failure(error: ExampleModelUpdateError) } enum ExampleModelUpdateError: Error, Equatable { case unspecified(debugInfo: String) } ཪଆͷ࢓ࣄͷ݁Ռ͕Equatableͩͱ  ޙͰศརʹͳΔͷͰɺEquatableͳ  ΤϥʔͷܕΛ࡞੒͓ͯ͘͠ ൃ ද Ͱ ͸ ׂ Ѫ

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ཪଆͷ࢓ࣄΛ͓͜ͳ͏Ϋϥε class ExampleModel { weak var delegate: ExampleModelDelegate? func update() { APIClient.shared.get(type: User.self, url: URLs.getSomething) { [weak self] (user, erro guard let `self` = self else { return } if let error = error { self.delegate?.apply(state: .failure(error: .unspecified(debugInfo: "\(error)") } else if let user = user { self.delegate?.apply(state: .success(userName: user.name)) } } } } ൃ ද Ͱ ͸ ׂ Ѫ

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class ExampleModel { weak var delegate: ExampleModelDelegate? func update() { APIClient.shared.get(type: User.self, url: URLs.getSomething) { [weak self] (user, erro guard let `self` = self else { return } if let error = error { self.delegate?.apply(state: .failure(error: .unspecified(debugInfo: "\(error)") } else if let user = user { self.delegate?.apply(state: .success(userName: user.name)) } } } } ஫ɿ͜ͷ໊લ͸ద౰ͳͷͰɺ࣮ࡍ͸֤ʑͷ  ΞʔΩςΫνϟʹԊ໋໊ͬͨʹ͍ͯͩ͘͠͞ ൃ ද Ͱ ͸ ׂ Ѫ

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class ExampleModel { weak var delegate: ExampleModelDelegate? func update() { APIClient.shared.get(type: User.self, url: URLs.getSomething) { [weak self] (user, erro guard let `self` = self else { return } if let error = error { self.delegate?.apply(state: .failure(error: .unspecified(debugInfo: "\(error)") } else if let user = user { self.delegate?.apply(state: .success(userName: user.name)) } } } } ཪଆͷ४උ͕੔ͬͨΒ௨஌͢Δઌͷ%FMFHBUF ͜ͷྫͰ͸ɺ7JFX$POUSPMMFS͔Β੾Γग़ͨ͠  Ϋϥε͕͜ͷ%FMFHBUFΛ࣮૷͢Δ͜ͱʹͳΔ ൃ ද Ͱ ͸ ׂ Ѫ

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class ExampleModel { weak var delegate: ExampleModelDelegate? func update() { APIClient.shared.get(type: User.self, url: URLs.getSomething) { [weak self] (user, erro guard let `self` = self else { return } if let error = error { self.delegate?.apply(state: .failure(error: .unspecified(debugInfo: "\(error)") } else if let user = user { self.delegate?.apply(state: .success(userName: user.name)) } } } } "1*ͷݺͼग़͠͸ɺ͜ͷΫϥεͷ  updateϝιουͷ࣮ߦͰ͸͡ΊΔ ൃ ද Ͱ ͸ ׂ Ѫ

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class ExampleModel { weak var delegate: ExampleModelDelegate? func update() { APIClient.shared.get(type: User.self, url: URLs.getSomething) { [weak self] (user, erro guard let `self` = self else { return } if let error = error { self.delegate?.apply(state: .failure(error: .unspecified(debugInfo: "\(error)") } else if let user = user { self.delegate?.apply(state: .success(userName: user.name)) } } } } "1*ͷ݁Ռ͕ࣦഊͷΑ͏ͳΒ.failure Λ %FMFHBUF΁௨஌͠ɺ੒ޭ͍ͯ͠ΔΑ͏  ͳΒ .successΛ%FMFHBUF΁௨஌͢Δ ൃ ද Ͱ ͸ ׂ Ѫ

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7JFX$POUSPMMFS͔Β෼཭ͨ͠ΫϥεͷFYUFOTJPO extension ExampleViewsAction: ExampleModelDelegate { func apply(state: ExampleModelState) { switch state { case .failure(let error): dump(error) let alertViewController = UIAlertController( title: "Τϥʔ͕ൃੜ͠·ͨ͠", message: nil, preferredStyle: .alert ) alertViewController.addAction(UIAlertAction(title: "OK", style: .default)) self.modalPresenter.present(alertViewController, animated: true) case .success(let userName): self.label.text = "Hello, \(userName)!" } } } ൃ ද Ͱ ͸ ׂ Ѫ

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extension ExampleViewsAction: ExampleModelDelegate { func apply(state: ExampleModelState) { switch state { case .failure(let error): dump(error) let alertViewController = UIAlertController( title: "Τϥʔ͕ൃੜ͠·ͨ͠", message: nil, preferredStyle: .alert ) alertViewController.addAction(UIAlertAction(title: "OK", style: .default)) self.modalPresenter.present(alertViewController, animated: true) case .success(let userName): self.label.text = "Hello, \(userName)!" } } } ઌ΄Ͳͷ%FMFHBUFΛ࣮૷ͤ͞Δ ൃ ද Ͱ ͸ ׂ Ѫ

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class ExampleViewsAction { private let label: UILabel private let modalPresenter: ModalPresenter private let model: ExampleModel init(label: UILabel, modalPresenter: ModalPresenter, model: ExampleModel) { self.label = label self.modalPresenter = modalPresenter self.model = model } func buttonDidTapped() { self.model.update() } } 7JFX$POUSPMMFS͔Β෼཭ͨ͠Ϋϥε ൃ ද Ͱ ͸ ׂ Ѫ

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class ExampleViewsAction { private let label: UILabel private let modalPresenter: ModalPresenter private let model: ExampleModel init(label: UILabel, modalPresenter: ModalPresenter, model: ExampleModel) { self.label = label self.modalPresenter = modalPresenter self.model = model } func buttonDidTapped() { self.model.update() } } ཪଆͷ࢓ࣄΫϥεͷ࡞੒Λ͜ͷதͰ΍ͬͯ΋͍͍ ͕ɺ7JFX$POUSPMMFS͔Β౉ͯ͠΋Β͏ͱɺͷͪ ͷָͪʹͳΔ ൃ ද Ͱ ͸ ׂ Ѫ

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class ExampleViewsAction { private let label: UILabel private let modalPresenter: ModalPresenter private let model: ExampleModel init(label: UILabel, modalPresenter: ModalPresenter, model: ExampleModel) { self.label = label self.modalPresenter = modalPresenter self.model = model } func buttonDidTapped() { self.model.update() } } ϘλϯͷλοϓͰཪଆͷ࢓ࣄΛ࢝ΊΔ ൃ ද Ͱ ͸ ׂ Ѫ

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मਖ਼ޙͷ7JFX$POUSPMMFS import UIKit class ExampleViewController: UIViewController { // লུ override func viewDidLoad() { super.viewDidLoad() self.actions = ExampleViewsAction( label: self.label, modalPresenter: ModalPresenter(willPresentOn: self), model: ExampleModel() ) } } ൃ ද Ͱ ͸ ׂ Ѫ

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import UIKit class ExampleViewController: UIViewController { // লུ override func viewDidLoad() { super.viewDidLoad() self.actions = ExampleViewsAction( label: self.label, modalPresenter: ModalPresenter(willPresentOn: self), model: ExampleModel() ) } } UILabelͳͲΛ౉͍ͭ͢Ͱʹཪଆͷ  ࢓ࣄΫϥε΋࡞੒ͯ͠౉͓ͯ͘͠ ൃ ද Ͱ ͸ ׂ Ѫ

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import XCTest import UIKit @testable import IOSDC2018Debugging class ExampleViewControllerTest: XCTestCase { func testMyNameIsVisible() { let dummyModalPresenter = ModalPresenter(willPresentOn: UIViewControlle let label = UILabel() let actions = ExampleViewsAction( label: label, modalPresenter: dummyModalPresenter, model: ExampleModel() ) actions.apply(state: .success(userName: "Kuniwak")) XCTAssertTrue(label.text?.contains("Kuniwak")) } } ͔͠͠ɺ͜͏ͯ͠͠·͏ͱϘλϯΛλοϓͯ͠  ද͕ࣔߋ৽͞ΕΔ͜ͱͷ֬ೝʹͳΒͳ͍ͷͰ͸ʁ  ͱ͍͏ෆ҆͸࣍ͷͭͷํ๏Ͱ؇࿨Ͱ͖Δɿ w Ϙλϯ͕λοϓ͞ΕͨΒɺཪͷ࢓ࣄΫϥε͕  ݺ͹ΕΔ͜ͱΛ֬ೝ͢ΔίʔυΛ௥Ճ w ཪͷ࢓ࣄΫϥε͕ݺ͹ΕͨΒɺඞͣ׬ྃ͢Δ  ͜ͱΛ֬ೝ͢ΔίʔυΛ௥Ճ ͦΕͧΕͷৄࡉ͸εϥΠυͷຕ਺ͷࣄ৘ͰׂѪ͢Δ͕ɺ Ҏ߱ͷεϥΠυͷ஌͚ࣝͩͰ࣮૷Ͱ͖Δ ൃ ද Ͱ ͸ ׂ Ѫ

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import XCTest import UIKit @testable import IOSDC2018Debugging class ExampleViewControllerTest: XCTestCase { func testMyNameIsVisible() { let dummyModalPresenter = ModalPresenter(willPresentOn: UIViewControlle let label = UILabel() let actions = ExampleViewsAction( label: label, modalPresenter: dummyModalPresenter, model: ExampleModel() ) actions.apply(state: .success(userName: "Kuniwak")) XCTAssertTrue(label.text?.contains("Kuniwak")) } } ͜Ε΋ίʔυͰಈ࡞֬ೝͰ͖Δ͕ɺ  εϥΠυͷຕ਺ͷ౎߹ͰׂѪ͢Δ ͜ͷ࡞ۀͷώϯτΛॻ͍͓ͯ͘ɿ w "1*ͷ݁ՌΛಈ࡞֬ೝίʔυ͔Β  ࢦఆͰ͖ΔΑ͏ʹ͢Δ ‎ *OQVU0CKFDU*OKFDUJPO w .PEBM1SFTFOUFSͷϝιουݺͼग़͠Λ  ه࿥͢ΔِͷΦϒδΣΫτΛ࡞੒͢Δ ‎ 0VUQVU0CKFDU*OKFDUJPO ͦΕͧΕͷৄࡉ͸ɺεϥΠυͷޙํͰ  ঺հ͢ΔʮJ04Ͱςετ༰қͳઃܭΛ  ࣮ݱ͢ΔͨΊͷσβΠϯύλʔϯʯͰ  αϯϓϧίʔυͱ߹Θͤͯղઆ͍ͯ͠Δ ൃ ද Ͱ ͸ ׂ Ѫ

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import XCTest import UIKit @testable import IOSDC2018Debugging class ExampleViewControllerTest: XCTestCase { func testMyNameIsVisible() { let dummyModalPresenter = ModalPresenter(willPresentOn: UIViewControlle let label = UILabel() let actions = ExampleViewsAction( label: label, modalPresenter: dummyModalPresenter, model: ExampleModel() ) actions.apply(state: .success(userName: "Kuniwak")) XCTAssertTrue(label.text?.contains("Kuniwak")) } } ͜Ε·Ͱͷ࡞ۀͰ΍ͬͨ͜ͱɿ w 7JFX$POUSPMMFSͷॲཧΛผ΁੾Γग़ͨ͠ w ผͷΫϥεͰUIViewController.presentΛ  ࢖͑ΔΑ͏ʹͨ͠ w ݟͨ໨ͷҰׅ൓өΛίʔυ͔Β  ࣮ߦͰ͖ΔΑ͏ʹͨ͠ ࣗಈͰͷಈ࡞֬ೝʹඞཁͳࡉ͔ͳ஌͕ࣝ  ͱͯ΋ଟ͍͜ͱ͕Θ͔Δ ൃ ද Ͱ ͸ ׂ Ѫ

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ಈ࡞֬ೝͷࣗಈԽʹ͸ɺී௨ͷ  ΞϓϦ࣮૷ͱ͸ҟͳΔ஌͕ࣝඞཁ ݴ͍͔ͨͬͨ͜ͱ͸

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։ൃ଎౓ͷ૿Ճྔ ࣌ؒܦա --%#ͷ  ׆༻ มߋ௚ޙͷ  σόοά ෆ҆ۦಈ  νΣοΫ ಈ࡞֬ೝͷ  ࣗಈԽ ؒҧ͑ʹ͍͘  ઃܭ

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։ൃ଎౓ͷ૿Ճྔ ͜͜·Ͱ͸͢ΜͳΓ͍͘ ࣌ؒܦա --%#ͷ  ׆༻ มߋ௚ޙͷ  σόοά ෆ҆ۦಈ  νΣοΫ ಈ࡞֬ೝͷ  ࣗಈԽ ؒҧ͑ʹ͍͘  ઃܭ

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։ൃ଎౓ͷ૿Ճྔ ࣌ؒܦա --%#ͷ  ׆༻ มߋ௚ޙͷ  σόοά ෆ҆ۦಈ  νΣοΫ ಈ࡞֬ೝͷ  ࣗಈԽ ؒҧ͑ʹ͍͘  ઃܭ ͋ΕʁࣗಈԽ͕೉͍ͧ͠ʜʁ  Ͱ΋ηϧϑνΣοΫͪΌΜͱ  ΍ͬͯΔ͔Β͕͔͔࣌ؒΔʜ

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։ൃ଎౓ͷ૿Ճྔ ࣌ؒܦա --%#ͷ  ׆༻ มߋ௚ޙͷ  σόοά ෆ҆ۦಈ  νΣοΫ ಈ࡞֬ೝͷ  ࣗಈԽ ؒҧ͑ʹ͍͘  ઃܭ ΋͏ͪΐͬͱؤுͬͯΈ͚ͨͲɺ  ͕͔͔࣌ؒΓ͗͢Δʜʜ

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։ൃ଎౓ͷ૿Ճྔ ࣌ؒܦա --%#ͷ  ׆༻ มߋ௚ޙͷ  σόοά ෆ҆ۦಈ  νΣοΫ ಈ࡞֬ೝͷ  ࣗಈԽ ؒҧ͑ʹ͍͘  ઃܭ ͩΊͩɺࣗಈԽແཧͩʜ ͜Μͳঢ়گͰෆ҆ͳൣғ  ͢΂ͯͷ֬ೝͳΜͯແཧʜ

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։ൃ଎౓ͷ૿Ճྔ ࣌ؒܦա --%#ͷ  ׆༻ มߋ௚ޙͷ  σόοά ෆ҆ۦಈ  νΣοΫ ಈ࡞֬ೝͷ  ࣗಈԽ ؒҧ͑ʹ͍͘  ઃܭ ΋͠ɺޮ཰తʹಈ࡞֬ೝΛ  ࣗಈԽ͢ΔͨΊͷ஌ࣝΛ  ͍࣋ͬͯͨΒʜ

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։ൃ଎౓ͷ૿Ճྔ ࣌ؒܦա --%#ͷ  ׆༻ มߋ௚ޙͷ  σόοά ෆ҆ۦಈ  νΣοΫ ಈ࡞֬ೝͷ  ࣗಈԽ ؒҧ͑ʹ͍͘  ઃܭ ͕͔͔͍࣌ؒͬͯΔͷ͸ɺ  ͜ͷςΫχοΫ࢖͑͹  গ͠ϚγʹͳΔ͸ͣʜ

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։ൃ଎౓ͷ૿Ճྔ ࣌ؒܦա --%#ͷ  ׆༻ มߋ௚ޙͷ  σόοά ෆ҆ۦಈ  νΣοΫ ಈ࡞֬ೝͷ  ࣗಈԽ ؒҧ͑ʹ͍͘  ઃܭ ͋ɺͳΜָ͔ʹͳ͖ͬͯͨ

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։ൃ଎౓ͷ૿Ճྔ ࣌ؒܦա --%#ͷ  ׆༻ มߋ௚ޙͷ  σόοά ෆ҆ۦಈ  νΣοΫ ಈ࡞֬ೝͷ  ࣗಈԽ ؒҧ͑ʹ͍͘  ઃܭ ΊͬͪΌָʹͳͬͨ

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։ൃ଎౓ͷ૿Ճྔ ࣌ؒܦա --%#ͷ  ׆༻ มߋ௚ޙͷ  σόοά ෆ҆ۦಈ  νΣοΫ ಈ࡞֬ೝͷ  ࣗಈԽ ؒҧ͑ʹ͍͘  ઃܭ ͋ͱ͔ΒৼΓฦΔͱɺ  ͜͜ʹͭΒ͍࣌ظ͕͋ͬͨ

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։ൃ଎౓ͷ૿Ճྔ ࣌ؒܦա --%#ͷ  ׆༻ มߋ௚ޙͷ  σόοά ෆ҆ۦಈ  νΣοΫ ಈ࡞֬ೝͷ  ࣗಈԽ ؒҧ͑ʹ͍͘  ઃܭ ࣗಈԽͷ୩

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։ൃ଎౓ͷ૿Ճྔ ࣌ؒܦա --%#ͷ  ׆༻ มߋ௚ޙͷ  σόοά ෆ҆ۦಈ  νΣοΫ ಈ࡞֬ೝͷ  ࣗಈԽ ؒҧ͑ʹ͍͘  ઃܭ ࣗಈԽͷ୩Λӽ͑ΔͨΊʹ͸ɺ  ͏·͘੾Γൈ͚ΔͨΊͷ஌͕ࣝ  ͱͯ΋େࣄͩͱ͍͏͜ͱ

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ࢲͷྫͰ͸ɺݩ͔Βಈ࡞֬ೝΛ  ಘҙͱ͍ͯͨ͠,VOJXBL͕ओಋͨ͠ ͭ·Γɺ୩Λ৐Γӽ͑Δ஌ࣝΛ΋͍ͬͯͯ  ڧͯ͘χϡʔήʔϜʹͳ͍ͬͯΔ

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ࣗಈԽͷ୩Λʮ͍ͭʯ  ৐Γӽ͑Δ͔ ܦݧऀ͕ޠΔ

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ίʔυ͕ߴྸͳ΄ͲɺࣗಈԽͷ୩͸  Ͳ͜·Ͱ΋ਂ͘ͳΓɺ͔ͭ௕͘ͳΔ ߴྸͳίʔυͰ͍͖ͳΓࣗಈԽͷ୩ӽ͑Λ  ໨ࢦ͢ͷ͸ແ஡Λӽ͑ͯແ๳ ٯʹɺίʔυ͕ए͚Ε͹·ͩࣗಈԽͷ୩Λ  ӽ͑ΒΕΔνϟϯε͕͋Δ ࢲͷࣄྫͰ͸ϑϧεΫϥονʹ  ్த͔ΒࢀՃͯ࢝͠Ί͍ͯΔ

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৽ػೳ࣮૷΍ϦχϡʔΞϧͳͲͰ  ৽͍͠ίʔυΛ͜Ε͔Βॻ͘ਓ͸ɺ ࠓ͕νϟϯεͩʂ

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୩ΛҰ౓Ͱ΋ӽ͑ΔܦݧΛͨ͠ਓ͸  ͔࣍Βڧͯ͘χϡʔήʔϜͰ͖Δ िؒͰ΋͍͍ͷͰɺখ͍͞࿅श༻ΞϓϦͰ  ࣗಈԽΛମݧ͓ͯ͘͜͠ͱ͕Φεεϝ ࠓλΠϛϯά͕ѱͯ͘΋ ࢲͷࣗಈԽͷ࿅शΞϓϦ HJUIVCDPN,VOJXBL5FTUBCMF%FTJHO&YBNQMF

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ࣗಈԽͷ୩ΛʮͲ͏ʯ  ৐Γӽ͑Δ͔ ܦݧऀ͕ޠΔ

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ࣗಈԽͷ୩Λ౿ഁ͢ΔͨΊʹ͸ɺҎԼͷ  ஌͕ࣝ໾ʹཱͭɿ w ޮ཰తͳಈ࡞֬ೝίʔυͷॻ͖ํ w ಈ࡞֬ೝ͠΍͍͢ຊମΞϓϦͷॻ͖ํ w ຊମΞϓϦͷม͍͖͑ͯํ ͜ΕΒͷτϐοΫ͸ʮςετʯͱ͍͏  ΧςΰϦͰޠΒΕΔ͜ͱ͕ଟ͍Ͱ͢

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ࣗಈԽͷ୩ӽ͑ͷͨΊͷࢿྉ ྫ͑͹ʜ

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ʮJ04Ͱςετ༰қͳઃܭΛ  ࣮ݱ͢ΔͨΊͷσβΠϯύλʔϯʯ https://speakerdeck.com/orgachem/ios-detesutorong- yi-nashe-ji-wo-shi-xian-surutamefalsedezainpatan ൃ ද Ͱ ͸ ׂ Ѫ

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ʮ4XJGUͷ)551ϥΠϒϥϦͰۤ͠·ͳ͍ͨΊͷ  ࣗ࡞"1*ΫϥΠΞϯτઃܭʯ https://qiita.com/Kuniwak/items/a972ff2ade643799d1fe ൃ ද Ͱ ͸ ׂ Ѫ

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ʮ4XJGUͰॻ͍͓ͯ΅͑Δ5%%ʯ μϯϘʔాத / @ktanaka117 ฤ ஶ  https://danbo-house.booth.pm/items/837289 ൃ ද Ͱ ͸ ׂ Ѫ

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ಠֶͷݶքΛײͨ͡Β ͍͔ͭ๚ΕΔ

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ʮJ045FTU/JHIUʯ https://testnight.connpass.com/ PS݄ʹ౦ژͰ։࠵༧ఆ

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%JTDPSETXJGUEFWFMPQFSTKBQBOUFTUJOH https://discordapp.com/invite/4Scjz4J ΦϯϥΠϯνϟοτͰ΋૬ஊͰ͖Δ৔ॴ͕͋Δ

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͜ͷൃදͰ఻͖͑Εͳ͔ͬͨ  ৄࡉͳ࣮૷ύλʔϯʹ͍ͭͯ͸ʜ ͦͯ͠ʜ

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ຊΛॻ͖·͢

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ٕज़ॻΫϥ΢υϑΝϯσΟϯά1&",4Ͱ  ϓϩδΣΫτΛެ։༧ఆʢ݄ʣ https://peaks.cc $0. */(  400/

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୩ӽ͑ͷ৺ߏ͑ λΠϛϯά͕੔ͬͨͱ͖ͷ

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λΠϛϯά͕ສશͰ΋  ୩͸ඞͣଘࡏ͢Δ ୩ఈʹԿ͕જΈɺ  Ͳ͏৐Γӽ͑Δ͔Λ஌Ζ͏

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৐Γӽ͑ΔͨΊͷ஌ࣝ͸ଟ͘ɺ  ࠷ॳ͸೉͘͠ײ͡Δ͔΋͠Εͳ͍ ͦΕͰ΋ɺ֮ͭ͑Δ͝ͱʹ  ୩͔Β͸গͮͭ͠཭Ε͍ͯΔ

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ཱͪࢭ·ͬͯ΋  ݱࡏ஍͸มΘΒͳ͍ ਐΊΔ࣌ʹਐΉ͙Β͍Ͱ  ͪΐ͏Ͳ͍͍

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·ͱΊ ΁ͷ։ൃ଎౓޲্Λࢧ͑ͨ ͭͷϊ΢ϋ΢ɿ --%#Λ࢖͍͜ͳ͢ σόοάͷλΠϛϯάΛมߋ௚ޙʹ͢Δ ෆ҆ۦಈͰηϧϑνΣοΫ͢Δ ಈ࡞֬ೝΛࣗಈԽ͢Δ ؒҧ͍ʹ͍͘ઃܭʹ͢Δ

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