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

Transcript

1. ͭ·͍ͮͨ࣌ͷσόοάज़ w ࣗݾ঺հ
   w എܠͱ໨త
   w σόοάज़
   w QSJOU
   PCKFDU
   w

   #SFBLQPJOU
   
   "DUJPO
   w &YDFQUJPO
   #SFBLQPJOU
   w 7JFX
   %FCVH

2. 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

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

4. 4 αϯϓϧΞϓϦʹ͍ͭͯ ιʔείʔυ
   https://github.com/IshibaSeiko/DebugDemo ػೳ
   ϘλϯΛλοϓ͢Δͱɺ
   ੺৭ͷViewͱ੨৭ͷViewͷલޙ͕੾ΓସΘΔ ॲཧ
   @IBAction func

   didTapSwapButton(_ sender: UIButton) { view.bringSubviewToFront(view.subviews[1]) }

5. 5 ࠓ೔঺հ͢Δσόοάज़ • print object w ஋Λ֬ೝ͍ͨ͠
   • Breakpoint +

   Action w ॲཧΛ௨Δͨͼʹ஋Λ֬ೝ͍ͨ͠
   • Exception Breakpoint w ΞϓϦΫϥογϡͷݪҼ͕஌Γ͍ͨ
   • View Debug w UI্ͷ໰୊Λ஌Γ͍ͨ

6. 6 σόοάज़
   
   print object import UIKit class ViewController: UIViewController { override

   func viewDidLoad() { super.viewDidLoad() } @IBAction func didTapSwapButton(_ sender: UIButton) { view.bringSubviewToFront(view.subviews[1]) } } ϚδοΫφϯόʔ͔ͩΒɺ
   ͲͷView͕औಘ͞ΕΔ͔Θ͔Βͳ͍

7. 7 Α͋͘Δ΍Γํ ໰୊఺ @IBAction func viewSwapButton(_ sender: UIButton) { view.bringSubviewToFront(view.subviews[1])

   print(view.subviews[1]) } • ֬ೝ͢ΔͨΊʹ͸Build͢Δඞཁ͕͋Δ • ػೳͱͯ͠ෆཁͳίʔυΛهड़͢Δ͜ͱͱͳΔ

8. 8 σόοάज़
   
   print object ίϯιʔϧͰ஋Λ֬ೝ͢Δ

9. 9 σόοάज़
   
   print object ੺৭ͷView͕औಘ͞Εͨ Ͱ΋ɺຖճpo͢Δͷɺ໘౗ʜ ϚδοΫφϯόʔ͔ͩΒɺ
   ͲͷView͕औಘ͞ΕΔ͔Θ͔Βͳ͍

10. 10 σόοάज़
    
    Breakpoint + Action BreakpointʹActionΛ௥Ճ͠ɺϩάΛදࣔ͢Δ

11. 11 σόοάज़
    
    Breakpoint + Action Ͱ΋ɺຖճ֬ೝ͢Δͷɺ໘౗ʜ ࣗಈͰϩά͕දࣔ͞ΕΔΑ͏ʹͳͬͨ ࣍͸όάΛൃੜͯ͠ΈΑ͏

12. 12 σόοάज़
    
    Exception Breakpoint ࣄ৅
    ϘλϯΛλοϓ͢Δͱɺ
    ΞϓϦ͕Ϋϥογϡ͢Δ ݪҼ͸ʜ

13. 13 σόοάज़
    
    Exception Breakpoint AppDelegateͰΫϥογϡ͢Δ΍ͭ

14. 14 σόοάज़
    
    Exception Breakpoint ྫ֎͕ൃੜͨ͠ՕॴͰϒϨʔΫ͢Δ

15. 15 σόοάज़
    
    Exception Breakpoint ϘλϯΛλοϓ͢Δͱɺ
    ΞϓϦ͕Ϋϥογϡ͢Δ ഑ྻʹଘࡏ͠ͳ͍σʔλΛऔಘ͠Α͏ͱ͍ͯͨ͠ ࣍΋όάΛൃੜͤͯ͞ΈΔ

16. 16 σόοάज़
    
    View Debug ࣄ৅
    ϘλϯΛλοϓͰ͖ͳ͍ ݪҼ͸ʜ

17. 17 σόοάज़
    
    View Debug Viewͷ֊૚Λ֬ೝ͢Δ

18. 18 σόοάज़
    
    View Debug SwapϘλϯΑΓલ໘ʹɺ
    User Interaction Enabled͕Onʹͳ͍ͬͯΔView͕
    ॏͳ͍ͬͯͨ ϘλϯΛλοϓͰ͖ͳ͍

19. 19 ·ͱΊ • print object w ίϯιʔϧͰ
    Apo
    {֬ೝ͍ͨ͠ίʔυ}AΛೖྗ͢Δ
    • Breakpoint +

    Action w ઃఆͨ͠BreakpointΛμϒϧλοϓͯ͠actionΛ௥Ճ͢Δ
    • Exception Breakpoint w Breakpoint NavigatorࠨԼͷʮ ʯ͔Β
    
    
    
    
    
    
    
    Exception BreakpointΛ௥Ճ͢Δ
    • View Debug w Debug View HierarchyΛλοϓ͢Δ