つまづいた時のデバッグ術 / yumemi-swift-how-to-debug

by IshibaSeiko

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ͭ·͍ͮͨ࣌ͷσόοάज़ w ࣗݾ঺հ w എܠͱ໨త w σόοάज़ w QSJOUPCKFDU w #SFBLQPJOU"DUJPO w &YDFQUJPO#SFBLQPJOU w 7JFX%FCVH

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2 ੴ৔ਗ਼ࢠ ͍͠͹͍ͤ͜ w J04ΤϯδχΞ w ࣮຿ܦݧ೥ ೥݄d w Swiftେ޷͖ w (JUIVC • https://github.com/IshibaSeiko w 2JJUB • https://qiita.com/seikoseikou w 5XJUUFS • @seikoseikou w #MPH • https://seikoseikou.com

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3 എܠͱ໨త wϓϩάϥϛϯά͸΄΅ະܦݧͰೖࣾͨͨ͠Ίɺ ʮσόοάʯΛ஌Βͳ͔ͬͨ wϏϧυͨ͠Βɺࢥ͍ඳ͍͍ͯͨڍಈʹͳΒͳ͔ͬͨʂ wόάௐࠪΛ೚͞Εͨʂ w Ͱ΋ɺݪҼͷௐ΂ํ͕Θ͔Βͳ͍ ϧʔΩʔୡʹɺσόοάज़Λڭ͍͑ͨʂ

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4 αϯϓϧΞϓϦʹ͍ͭͯ ιʔείʔυ https://github.com/IshibaSeiko/DebugDemo ػೳ ϘλϯΛλοϓ͢Δͱɺ ੺৭ͷViewͱ੨৭ͷViewͷલޙ͕੾ΓସΘΔ ॲཧ @IBAction func didTapSwapButton(_ sender: UIButton) { view.bringSubviewToFront(view.subviews[1]) }

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5 ࠓ೔঺հ͢Δσόοάज़ • print object w ஋Λ֬ೝ͍ͨ͠ • Breakpoint + Action w ॲཧΛ௨Δͨͼʹ஋Λ֬ೝ͍ͨ͠ • Exception Breakpoint w ΞϓϦΫϥογϡͷݪҼ͕஌Γ͍ͨ • View Debug w UI্ͷ໰୊Λ஌Γ͍ͨ

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6 σόοάज़print object import UIKit class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() } @IBAction func didTapSwapButton(_ sender: UIButton) { view.bringSubviewToFront(view.subviews[1]) } } ϚδοΫφϯόʔ͔ͩΒɺ ͲͷView͕औಘ͞ΕΔ͔Θ͔Βͳ͍

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7 Α͋͘Δ΍Γํ ໰୊఺ @IBAction func viewSwapButton(_ sender: UIButton) { view.bringSubviewToFront(view.subviews[1]) print(view.subviews[1]) } • ֬ೝ͢ΔͨΊʹ͸Build͢Δඞཁ͕͋Δ • ػೳͱͯ͠ෆཁͳίʔυΛهड़͢Δ͜ͱͱͳΔ

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8 σόοάज़print object ίϯιʔϧͰ஋Λ֬ೝ͢Δ

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9 σόοάज़print object ੺৭ͷView͕औಘ͞Εͨ Ͱ΋ɺຖճpo͢Δͷɺ໘౗ʜ ϚδοΫφϯόʔ͔ͩΒɺ ͲͷView͕औಘ͞ΕΔ͔Θ͔Βͳ͍

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10 σόοάज़Breakpoint + Action BreakpointʹActionΛ௥Ճ͠ɺϩάΛදࣔ͢Δ

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11 σόοάज़Breakpoint + Action Ͱ΋ɺຖճ֬ೝ͢Δͷɺ໘౗ʜ ࣗಈͰϩά͕දࣔ͞ΕΔΑ͏ʹͳͬͨ ࣍͸όάΛൃੜͯ͠ΈΑ͏

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12 σόοάज़Exception Breakpoint ࣄ৅ ϘλϯΛλοϓ͢Δͱɺ ΞϓϦ͕Ϋϥογϡ͢Δ ݪҼ͸ʜ

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13 σόοάज़Exception Breakpoint AppDelegateͰΫϥογϡ͢Δ΍ͭ

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14 σόοάज़Exception Breakpoint ྫ֎͕ൃੜͨ͠ՕॴͰϒϨʔΫ͢Δ

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15 σόοάज़Exception Breakpoint ϘλϯΛλοϓ͢Δͱɺ ΞϓϦ͕Ϋϥογϡ͢Δ ഑ྻʹଘࡏ͠ͳ͍σʔλΛऔಘ͠Α͏ͱ͍ͯͨ͠ ࣍΋όάΛൃੜͤͯ͞ΈΔ

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16 σόοάज़View Debug ࣄ৅ ϘλϯΛλοϓͰ͖ͳ͍ ݪҼ͸ʜ

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17 σόοάज़View Debug Viewͷ֊૚Λ֬ೝ͢Δ

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18 σόοάज़View Debug SwapϘλϯΑΓલ໘ʹɺ User Interaction Enabled͕Onʹͳ͍ͬͯΔView͕ ॏͳ͍ͬͯͨ ϘλϯΛλοϓͰ͖ͳ͍

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19 ·ͱΊ • print object w ίϯιʔϧͰApo{֬ೝ͍ͨ͠ίʔυ}AΛೖྗ͢Δ • Breakpoint + Action w ઃఆͨ͠BreakpointΛμϒϧλοϓͯ͠actionΛ௥Ճ͢Δ • Exception Breakpoint w Breakpoint NavigatorࠨԼͷʮʯ͔Β Exception BreakpointΛ௥Ճ͢Δ • View Debug w Debug View HierarchyΛλοϓ͢Δ