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%

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)
}
ᶃؔ਺Λ࣮ߦ
ίʔϧελοΫ

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bar(fooVar)
}
baz(barVar)
}
print(bazVar)
}
ίʔϧελοΫ
Ҿ਺
ϩʔΧϧม਺
GPP"SH
GPP7BS
GPPؔ਺
ؔ਺͕ݺͼग़͞ΕΔͱɺ 
ελοΫϑϨʔϜ͕࡞੒͞Εɺ 
ίʔϧελοΫʹੵ·ΕΔ

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bar(fooVar)
}
baz(barVar)
}
print(bazVar)
}
ᶄ಺෦Ͱؔ਺Λ࣮ߦ
ίʔϧελοΫ
Ҿ਺
ϩʔΧϧม਺
GPP"SH
GPP7BS
GPPؔ਺

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bar(fooVar)
}
baz(barVar)
}
print(bazVar)
}
ίʔϧελοΫ
Ҿ਺
ϩʔΧϧม਺
GPP"SH
GPP7BS
GPPؔ਺
Ҿ਺
ϩʔΧϧม਺
CBS"SH
CBS7BS
CBSؔ਺
ݺͼग़͞Εͨؔ਺ͷதͰ 
͞Βʹผͷؔ਺͕ݺ͹Εͯ΋ 

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bar(fooVar)
}
baz(barVar)
}
print(bazVar)
}
ᶅ͞Βʹ಺෦Ͱؔ਺Λ࣮ߦ
ίʔϧελοΫ
Ҿ਺
ϩʔΧϧม਺
GPP"SH
GPP7BS
GPPؔ਺
Ҿ਺
ϩʔΧϧม਺
CBS"SH
CBS7BS
CBSؔ਺

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bar(fooVar)
}
baz(barVar)
}
print(bazVar)
}
ίʔϧελοΫ
Ҿ਺
ϩʔΧϧม਺
GPP"SH
GPP7BS
GPPؔ਺
Ҿ਺
ϩʔΧϧม਺
CBS"SH
CBS7BS
CBSؔ਺
Ҿ਺
ϩʔΧϧม਺
CB["SH
CB[7BS
CB[ؔ਺

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bar(fooVar)
}
baz(barVar)
}
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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bar(fooVar)
}
baz(barVar)
}
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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bar(fooVar)
}
baz(barVar)
}
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

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9DPEF "QQ$PEF
ͦͷ࣌఺ͷม਺΍Ҿ਺ΛݟΒΕΔ

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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")!
| | | | | | | | | | | | | | | | | <_UILabelContentLayer: 0x6040006336e0> (layer)
·ͣɺදࣔ͞Ε͍ͯΔ6*7JFXͷҰཡΛදࣔ

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(lldb) po UIApplication.shared.keyWindow! 
.value(forKey: "recursiveDescription")!
| | | | | | | | | | | | | | | | | <_UILabelContentLayer: 0x6040006336e0> (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
ΠϯελϯεΛऔಘͰ͖͔ͨͲ͏͔֬ೝͯ͠ΈΑ͏

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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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"Optional(42)"

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struct Example {
let x: Int! = i
return "\(x)"
}
}
όάΛݟ͚ͭͨΒ௚લͷ࣮૷Օॴʹ໭Ζ͏

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struct Example {
let x: Int = i!
return "\(x)"
}
}
Int!ΛจࣈྻԽ͢Δͱ"Optional(...)"ʹ 
ͳͬͯ͠·͏ͷͰɺIntʹͳΔΑ͏मਖ਼͢Δ

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struct Example {
let x: Int! = i
return "\(x)"
}
}
࣮૷௚ޙʹσόοάͨ͠ͷͰɺ 
ݪҼՕॴ͕͙ۙ͘͢ʹݟ͔ͭͬͨ

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मਖ਼ͨ͠Βɺ·͙ͨ͢ʹಈ࡞֬ೝ͠Α͏
"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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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

෼ۀ࠷େ

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։ൃ͕࣌ؒ৳ͼΔ

෼ۀ࠷େ ख໭Γ࠷େ

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෼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 {
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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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
"intToString": {
}
},
]
func debugAll() {
targets[index]()
}
}
#endif
͜ͷίʔυ͸ɺintToString(42)ͷ 
݁Ռ͕"42"ʹͳΔ͜ͱΛ֬ೝ͍ͯ͠Δ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

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#if DEBUG
import Foundation
"intToString": {
}
},
]
func debugAll() {
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

View Slide

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

View Slide

؀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

View Slide

ΞϓϦΛ࣮ߦ͢Δͱಈ࡞֬ೝͰ͖Δ
"QQ$PEF
ࣦ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࡞֬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୒
"QQ$PEF
ൃ
ද
Ͱ
͸
ׂ
Ѫ

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9DPEF
ᶆ5FTUJOHΛ࣮ߦ
ᶇ5FTU4VDDFFEFE͕දࣔ͞ΕΕ͹0,
ൃ
ද
Ͱ
͸
ׂ
Ѫ

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

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

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͜ΕͰಈ࡞֬ೝ༻ͷ5BSHFUΛ࡞੒Ͱ͖ͨ

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import XCTest
@testable import IOSDC2018Debugging
class ExampleTest: XCTestCase {
func testIntToString() {
let str = Example.intToString(42)
XCTAssertEqual(str, "42")
}
}
ඪ४ϥΠϒϥϦΛ࢖͏৔߹ͷ 
ಈ࡞֬ೝͷίʔυ͸͜͏ͳΔ

View Slide

import XCTest
}
}
ಈ࡞֬ೝͷίʔυͷUBSHFU͸ 
ઌ΄Ͳ࡞੒ͨ͠UBSHFUʹ͢Δ

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

View Slide

import XCTest
}
}
ඪ४ϥΠϒϥϦ9$5FTUΛಡΈࠐΉ
ΞϓϦͷίʔυ͸ผͷ5BSHFUͳͷͰ 
࢖͏ࡍʹ͸import͕ඞཁ
ී௨ʹimport͢Δͱpublicͷ΋ͷ͔͠ 
ݟ͑ͳ͘ͳͬͯ͠·͏͕ɺ@testableΛͭ
͚Δͱinternal·Ͱݟ͑ΔΑ͏ʹͳΔ

View Slide

import XCTest
}
}
ಈ࡞֬ೝͷίʔυ͸XCTestCaseͱ͍͏ 
ΫϥεͰάϧʔϐϯάͰ͖ΔΑ͏ʹͳ͍ͬͯΔ
ಈ࡞֬ೝͷίʔυΛॻ͘৔߹ʹ͸ɺ֬ೝର৅ͷ 
Ϋϥε΍ؔ਺୯ҐͰXCTestCaseΛ෼͚Δͱ 
ಈ࡞֬ೝͷ݁Ռ͕Θ͔Γ΍͘͢ͳΔ

View Slide

import XCTest
}
}
࣮ࡍͷಈ࡞֬ೝͷίʔυ͸ɺΠϯελϯεϝιουͱ࣮ͯ͠૷͢Δ
͜ͷϝιουͷ໊લ͸ઌ಄ʹtestͱ͚ͭͳ͍ͱ࣮ߦ͞Εͳ͍ͷͰ஫ҙ

View Slide

import XCTest
}
}
ಈ࡞֬ೝͷର৅Λ࣮ࡍʹ࣮ߦ͢Δ

View Slide

import XCTest
}
}
ਖ਼ޡ൑ఆ͸XCTAssertEqualͳͲͷؔ਺Λ࢖͏
͜ͷؔ਺͸ɺͭͷҾ਺͕౳͘͠ͳ͍ͱɺ 
ಈ࡞֬ೝΛࣦഊͱΈͳ͢Α͏ʹͳ͍ͬͯΔ

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

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"QQ$PEF
ෳ਺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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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

View Slide

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

View Slide

վળલͱͷൺֱ
ײ͍ͯͩ͘͡͞

View Slide

్த·Ͱ͏·͍͘͘ͷʹ 
కΊ੾Γʹؒʹ߹Θͳ͍

View Slide

ෆ҆ۦಈνΣοΫͰख໭Γ͕ 
গͳ͘ͳͬͨͷͰɺ༧ఆ௨Γʹ 
ਐΉΑ͏ʹͳͬͨʂ

View Slide

కΊ੾Γ͕ഭͬͯ͘Δͱ 
ಈ࡞֬ೝΛ͖͠Εͳͯ͘ 
େৎ෉ͩͱ৴͡Δ͔͠ͳ͍

View Slide

ಈ࡞֬ೝͷࣗಈԽͰɺӨڹൣғͷ 
ಈ࡞֬ೝ·ͰͰ͖ΔΑ͏ʹͳͬͨʂ

View Slide

4JNVMBUPSΆͪΆͪʹ 
͕͔͔࣌ؒͬͯΠϥΠϥ͢Δ

View Slide

ಈ࡞֬ೝͷࣗಈԽͰ 
ΆͪΆ͍ͪΒͳ͘ͳͬͨʂ

View Slide

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

View Slide

࣮ࡍ͸͜Μͳʹ 
͢ΜͳΓ͍͔ͳ͍
Τ
ο
ʂ
ʁ

View Slide

ࣗಈԽͷ୩໰୊
ཱͪ͸͔ͩΔ

View Slide

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

View Slide

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೉͍͠ྫ

View Slide

͜Μͳ୯७ͳ7JFX$POUSPMMFSͰ΋ɺ
ಈ࡞֬ೝΛࣗಈԽ͢ΔͨΊͷ஌͕ࣝ 
͔ͳΓଟ͍ͱ͍͏͜ͱΛײ͡Ͱ͍ͩ͘͞

View Slide

import UIKit
@IBAction
dump(error)
message: nil,
)
return
}
}
}
}
Ϙλϯ͕λοϓ͞ΕͨΒ 
αʔόͱ௨৴Λ࢝ΊΔ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import UIKit
@IBAction
dump(error)
message: nil,
)
return
}
}
}
}
αʔόʔͱͷ௨৴͕ 
Τϥʔʹͳͬͨ৔߹͸ 
6*"MFSU$POUSPMMFSͰදࣔ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import UIKit
@IBAction
dump(error)
message: nil,
)
return
}
}
}
}
αʔόʔ͔ΒϢʔβʔ໊͕ 
ਖ਼ৗʹฦ͖ͬͯͨΒදࣔ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import XCTest
import UIKit
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

View Slide

import XCTest
import UIKit
XCTAssertTrue(viewController.label!.text!.contains("Kuniwak"))
}
}
4UPSZCPBSE͔Β7JFX$POUSPMMFSΛॳظԽ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import XCTest
import UIKit
}
}
@IBActionΛ࣮ߦͯ͠ϘλϯλοϓΛ࠶ݱ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import XCTest
import UIKit
}
}
UILabel͕Ϣʔβʔ໊ʹมΘͬͨ͜ͱΛ֬ೝ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import XCTest
import UIKit
}
}
viewController.label͕nil
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import XCTest
import UIKit
}
}
viewDidLoadΛ଴ͬͯͳ͍ͷͰɺ 
·ͩUILabel͕ଘࡏ͍ͯ͠ͳ͍
ݪҼɿ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

private var actions: ExampleViewsAction?
override func viewDidLoad() {
super.viewDidLoad()
self.actions = ExampleViewsAction(
label: self.label
)
}
@IBAction
self.actions?.buttonDidTapped()
}
}
मਖ਼ޙͷ7JFX$POUSPMMFS
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

super.viewDidLoad()
label: self.label
)
}
@IBAction
}
}
viewDidLoadҎ߱ͷॲཧΛผͷΫϥεʹ੾Γग़͢
ʢͳͥ͜͏͢Δͷ͔͸΋͏গ͠ޙͰΘ͔Γ·͢ʣ
ॏཁͳͷ͸ɺviewDidLoadͰॳظԽ͞Εͨ 
UILabelΛ੾Γग़ͨ͠Ϋϥεʹ౉͓ͯ͘͜͠ͱ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

super.viewDidLoad()
label: self.label
)
}
@IBAction
}
}
Ϙλϯͷλοϓॲཧ͸ 
@IBActionΛԣྲྀ͢͠Ε͹0,
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import UIKit
class ExampleViewsAction {
private let label: UILabel
init(label: UILabel) {
self.label = label
}
func buttonDidTapped() {
// লུ
return
}
}
}
}
7JFX$POUSPMMFS͔Β෼཭͞Εͨίʔυ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import UIKit
self.label = label
}
// লུ
return
}
}
}
}
஫ɿ͜ͷ໊લ͸ద౰ͳͷͰɺ࣮ࡍ͸֤ʑͷ 
ΞʔΩςΫνϟʹԊ໋໊ͬͨʹ͍ͯͩ͘͠͞
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import UIKit
self.label = label
}
// লུ
return
}
}
}
}
7JFX$POUSPMMFS͔Β౉͞ΕͨUILabel
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import UIKit
self.label = label
}
// লུ
return
}
}
}
}
7JFX$POUSPMMFSͷॲཧΛͦͷ··Ҡಈ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import UIKit
self.label = label
}
// লུ
return
}
}
}
}
self.present͕ଘࡏ͠ͳ͍
ʢ͜Ε͸গ͠ޙͰमਖ਼͢Δʣ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

मਖ਼ޙͷಈ࡞֬ೝίʔυ
import XCTest
import UIKit
let label = UILabel()
let actions = ExampleViewsAction(label: label)
actions.buttonDidTapped()
XCTAssertTrue(label.text?.contains("Kuniwak"))
}
}
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import XCTest
import UIKit
}
}
7JFX$POUSPMMFSͰ͸ͳ͘ɺ 
੾Γग़ͨ͠ΫϥεͷํΛ 
ಈ࡞֬ೝ͢ΔΑ͏ʹ͢Δ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import XCTest
import UIKit
}
}
7JFX$POUSPMMFS͔ΒUILabel͕౉͞ΕΔͷΛ࠶ݱ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import XCTest
import UIKit
}
}
@IBActionͰλοϓΛ࠶ݱ͢Δ෦෼͸
੾Γग़ͨ͠Ϋϥεͷํͷϝιουͷ࣮ߦͰ୅ସ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import XCTest
import UIKit
}
}
ઌ΄Ͳ౉ͨ͠UILabelͷ಺༰͕ 
มΘ͍ͬͯΔ͔͔֬ΊΒΕ͍ͯΔ
͜͏͢Δ͜ͱͰUILabel͕·ͩ 
ଘࡏ͠ͳ͍໰୊ΛղܾͰ͖Δ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import UIKit
self.label = label
}
// লུ
return
}
}
}
}
self.present͕ଘࡏ͠ͳ͍ͷͰ 
·ͩϏϧυ͕௨Βͳ͍
7JFX$POUSPMMFS͔Β෼཭͞Εͨίʔυ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

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

View Slide

import UIKit
}
}
}
7JFX$POUSPMMFSͷpresentΛ 
ผͷΫϥεͰ΋ୟ͚ΔΑ͏ʹ͢ΔΫϥε
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import UIKit
}
}
}
presentʹ࢖͏7JFX$POUSPMMFSΛ಺෦ʹอ࣋͢Δ 
ʢϝϞϦϦʔΫΛආ͚ΔͨΊʹweakʹ͢Δʣ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import UIKit
}
}
}
͜ͷΫϥεͷpresentΛ࣮ߦ͢Δͱɺอ͍࣋ͯͨ͠ 
7JFX$POUSPMMFSͷpresent͕࣮ߦ͞ΕΔ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import UIKit
private let modalPresenter: ModalPresenter
init(label: UILabel, modalPresenter: ModalPresenter) {
self.label = label
self.modalPresenter = modalPresenter
}
// লུ
self.modalPresenter.present(alertViewController, animated: true)
return
}
}
}
}
मਖ਼ޙͷ7JFX$POUSPMMFS͔Β෼཭͞Εͨίʔυ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import UIKit
self.label = label
}
// লུ
return
}
}
}
}
7JFX$POUSPMMFS͔ΒUILabelͱҰॹʹ 
ઌ΄ͲͷModalPresenterΛड͚औΔ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import UIKit
self.label = label
}
// লུ
return
}
}
}
}
self.presentΛModalPresenterͷ 
presentͷݺͼग़͠΁ม͑Δ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import XCTest
import UIKit
let dummyModalPresenter = ModalPresenter(
willPresentOn: UIViewController()
)
let actions = ExampleViewsAction(
label: label,
modalPresenter: dummyModalPresenter
)
}
}
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import XCTest
import UIKit
)
label: label,
)
}
}
Ϗϧυ͕௨Γ͑͢͞Ε͹͍͍ͷͰɺ 
ద౰ͳModalPresenterΛ࡞੒͢Δ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import XCTest
import UIKit
)
label: label,
)
}
}
7JFX$POUSPMMFS͔Β 
੾Γग़ͨ͠Ϋϥε΁౉͢
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import XCTest
import UIKit
)
label: label,
)
}
}
Ϗϧυ͕௨ΔΑ͏ʹͳͬͨ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import XCTest
import UIKit
)
label: label,
)
}
}
XCTAssertEqual failed: ("nil") is 
not equal to ("Optional(true)")
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import XCTest
import UIKit
)
label: label,
)
}
}
͜ͷ࣌ͷlabel.textΛݟΔͱ 
ॳظ஋ͷ··ʹͳ͍ͬͯͨ
Ϣʔβʔ໊͕·ͩදࣔ͞Ε͍ͯͳ͍Α͏ͩ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

import XCTest
import UIKit
)
label: label,
)
}
}
ݪҼɿ
αʔόʔ͔Βͷฦ৴͕·ͩ 
ฦ͖͍ͬͯͯͳ͍ͷͰɺ 
UILabelΛߋ৽Ͱ͖͍ͯͳ͍
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

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

View Slide

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

View Slide

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

View Slide

}
}
}
ཪଆͷ࢓ࣄͷ४උ͕੔ͬͨͱ͖ʹୟ͍ͯ΋Β͏ 
ݟͨ໨ͷҰׅ൓өϝιου
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

}
}
}
ཪଆͷ࠷ऴతͳ݁Ռ͸ɺ
w ੒ޭͯ͠userName
w ࣦഊͯ͠error
ͷͲͪΒ͔ͳͷͰɺFOVNͰදݱ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

}
}
}
ཪଆͷ࢓ࣄͷ݁Ռ͕Equatableͩͱ 
ޙͰศརʹͳΔͷͰɺEquatableͳ 
ΤϥʔͷܕΛ࡞੒͓ͯ͘͠
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

ཪଆͷ࢓ࣄΛ͓͜ͳ͏Ϋϥε
class ExampleModel {
weak var delegate: ExampleModelDelegate?
func update() {
APIClient.shared.get(type: User.self, url: URLs.getSomething) { [weak self] (user, erro
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

View Slide

func update() {
}
}
}
}
}
஫ɿ͜ͷ໊લ͸ద౰ͳͷͰɺ࣮ࡍ͸֤ʑͷ 
ΞʔΩςΫνϟʹԊ໋໊ͬͨʹ͍ͯͩ͘͠͞
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

func update() {
}
}
}
}
}
ཪଆͷ४උ͕੔ͬͨΒ௨஌͢Δઌͷ%FMFHBUF
͜ͷྫͰ͸ɺ7JFX$POUSPMMFS͔Β੾Γग़ͨ͠ 
Ϋϥε͕͜ͷ%FMFHBUFΛ࣮૷͢Δ͜ͱʹͳΔ
ൃ
ද
Ͱ
͸
ׂ
Ѫ

View Slide

func update() {
}
}
}
}
}
"1*ͷݺͼग़͠͸ɺ͜ͷΫϥεͷ 
updateϝιουͷ࣮ߦͰ͸͡ΊΔ
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func update() {
}
}
}
}
}
"1*ͷ݁Ռ͕ࣦഊͷΑ͏ͳΒ.failure Λ
%FMFHBUF΁௨஌͠ɺ੒ޭ͍ͯ͠ΔΑ͏ 
ͳΒ .successΛ%FMFHBUF΁௨஌͢Δ
ൃ
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7JFX$POUSPMMFS͔Β෼཭ͨ͠ΫϥεͷFYUFOTJPO
extension ExampleViewsAction: ExampleModelDelegate {
func apply(state: ExampleModelState) {
switch state {
case .failure(let error):
dump(error)
message: nil,
)
case .success(let userName):
self.label.text = "Hello, \(userName)!"
}
}
}
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switch state {
dump(error)
message: nil,
)
}
}
}
ઌ΄Ͳͷ%FMFHBUFΛ࣮૷ͤ͞Δ
ൃ
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Ѫ

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switch state {
dump(error)
message: nil,
)
}
}
}
දࣔͷҰׅߋ৽ϝιουΛ࣮૷ 
ʢ಺༰͸मਖ਼લͱಉ͡ʣ
ൃ
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Ѫ

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private let model: ExampleModel
init(label: UILabel, modalPresenter: ModalPresenter,
model: ExampleModel) {
self.label = label
self.model = model
}
self.model.update()
}
}
7JFX$POUSPMMFS͔Β෼཭ͨ͠Ϋϥε
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self.label = label
self.model = model
}
self.model.update()
}
}
ཪଆͷ࢓ࣄΫϥεͷ࡞੒Λ͜ͷதͰ΍ͬͯ΋͍͍
͕ɺ7JFX$POUSPMMFS͔Β౉ͯ͠΋Β͏ͱɺͷͪ
ͷָͪʹͳΔ
ൃ
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Ѫ

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self.label = label
self.model = model
}
self.model.update()
}
}
ϘλϯͷλοϓͰཪଆͷ࢓ࣄΛ࢝ΊΔ
ൃ
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View Slide

मਖ਼ޙͷ7JFX$POUSPMMFS
import UIKit
// লུ
super.viewDidLoad()
label: self.label,
modalPresenter: ModalPresenter(willPresentOn: self),
model: ExampleModel()
)
}
}
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Ѫ

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import UIKit
// লུ
super.viewDidLoad()
label: self.label,
modalPresenter: ModalPresenter(willPresentOn: self),
)
}
}
UILabelͳͲΛ౉͍ͭ͢Ͱʹཪଆͷ 
࢓ࣄΫϥε΋࡞੒ͯ͠౉͓ͯ͘͠
ൃ
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Ѫ

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import XCTest
import UIKit
let dummyModalPresenter = ModalPresenter(willPresentOn: UIViewControlle
label: label,
modalPresenter: dummyModalPresenter,
)
actions.apply(state: .success(userName: "Kuniwak"))
}
}
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import XCTest
import UIKit
label: label,
)
}
}
Ϙλϯͷλοϓͷ࠶ݱͰ͸ͳ͘ɺ 
௚઀ݟͨ໨ͷ൓өϝιουΛୟ͘
ൃ
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Ѫ

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import XCTest
import UIKit
label: label,
)
}
}
͔͠͠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
ൃ
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Ѫ

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import XCTest
import UIKit
label: label,
)
}
}
Ͱ͸ಈ࡞֬ೝΛ࣮ߦͯ͠ΈΑ͏
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import XCTest
import UIKit
label: label,
)
}
}
͜͜·Ͱ͖ͯ΍ͬͱ੒ޭ͠·͢
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import XCTest
import UIKit
label: label,
)
}
}
͔͠͠ɺ·ͩ"1*ݺͼग़͕͠Τϥʔʹ
ͳͬͨ৔߹ͷಈ࡞֬ೝΛͰ͖͍ͯͳ͍ʜ
ൃ
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import XCTest
import UIKit
label: label,
)
}
}
͜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
ൃ
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Ѫ

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import XCTest
import UIKit
label: label,
)
}
}
͜Ε·Ͱͷ࡞ۀͰ΍ͬͨ͜ͱɿ
w 7JFX$POUSPMMFSͷॲཧΛผ΁੾Γग़ͨ͠
w ผͷΫϥεͰUIViewController.presentΛ 
࢖͑ΔΑ͏ʹͨ͠
w ݟͨ໨ͷҰׅ൓өΛίʔυ͔Β 
࣮ߦͰ͖ΔΑ͏ʹͨ͠
ࣗಈͰͷಈ࡞֬ೝʹඞཁͳࡉ͔ͳ஌͕ࣝ 
ͱͯ΋ଟ͍͜ͱ͕Θ͔Δ
ൃ
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Ѫ

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

View Slide

։ൃ଎౓ͷ૿Ճྔ
࣌ؒܦա

--%#ͷ 
׆༻
มߋ௚ޙͷ 
σόοά
ෆ҆ۦಈ 
νΣοΫ
ಈ࡞֬ೝͷ 
ࣗಈԽ
ؒҧ͑ʹ͍͘ 
ઃܭ

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͜͜·Ͱ͸͢ΜͳΓ͍͘
࣌ؒܦա

--%#ͷ 
׆༻
มߋ௚ޙͷ 
σόοά
ෆ҆ۦಈ 
νΣοΫ
ಈ࡞֬ೝͷ 
ࣗಈԽ
ؒҧ͑ʹ͍͘ 
ઃܭ

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

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

View Slide

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

View Slide

࣌ؒܦա

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

View Slide

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

View Slide

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

View Slide

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

View Slide

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

View Slide

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

View Slide

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

View Slide

࣌ؒ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

View Slide

ࣗ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
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͸
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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

View Slide

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

View Slide

ཱͪࢭ·ͬͯ΋ 
ݱࡏ஍͸มΘΒͳ͍
ਐΊΔ࣌ʹਐΉ͙Β͍Ͱ 
ͪΐ͏Ͳ͍͍

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

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,VOJXBL͔Βͷϝοηʔδ
։ൃ଎౓ୡ੒ͷલʹ͸ 
ࣗಈԽͷ୩͕ଘࡏ͢Δ
৐Γӽ͑ΔͨΊͷ஌ࣝΛ 
͍֮ͭͣͭ͑ͯ͜͏
ཱͪࢭ·ͬͯ΋ޙ໭Γ͸͠ͳ͍͔Βɺ 
ਐΊΔ࣌ʹਐΉ͙Β͍Ͱͪΐ͏Ͳ͍͍

View Slide

ݸਓతʹ͸ɺJ04%$Ͱ΋΋ͬͱ 
ࣗಈతͳಈ࡞֬ೝʢςετʣͷ 
ϊ΢ϋ΢ͷൃද͕͋ͬͯ΋͍͍ͱࢥ͏ʜ

View Slide

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%

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%

Kuniwak

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