魅せるデバッグ技術

iOSDC Reject Conference days2

Transcript

1. 2016/08/31 iOSDC Reject Conference days2 @dealforest Toshihiro Morimoto ັͤΔσόοάٕज़
2. ࣗݾ঺հ
3. Works
5. (ͭд⊂)ŠƄŢŠƄŢ
7. ʢʀƅЧƅʣ …ʂʁ
8. ొஃऀ͕ޙ൒Λ઎ΊΔͱ͍͏๫ڍw
9. ັͤΔσόοάٕज़
11. ͯ͞ɺօ͞Μ ͜͏͍͏৔߹Ͳ͏͠·͔͢ʁʁ
14. ౰વ͜Εʹؾ͍ͮͨҙࣝͷߴ͍ ͋ͳͨ͸σόοάΛ։࢝͠·͢
15. ϩάΛ࢓ࠐΜͰ…
16. ࠶ىಈʂ
18. (ͭд⊂)ŠƄŢŠƄŢ
20. ※ ຊਓͷڐՄ͸ಘ͍ͯ·͢
21. Α͠ɺ࣍ʹ࠶ݱͨ͠Βௐ΂Α͏…
22. ϓϦϯτσόοά͋Δ͋ΔͰ͢Ͷ
23. ࢓ํͳ͍ͷͰ೴಺σόοά։࢝
24. ݪҼީิ • େݩͷը૾͋Δʁ • ௨৴Τϥʔʁ • cache ͯͨ͠ը૾͕͓͔͍͠ʁ • SDWebImage, Kingfisher ͳͲͷ͍ͤʁ
25. શવΘ͔Γ·ͤΜͶ
26. ͦΜͳ࣌ͦ͜ LLDB ͷग़൪Ͱ͢
27. LLDB ͳΒͦͷλΠϛϯάͰͷ ৘ใΛऔಘ͢Δ͜ͱ͕Ͱ͖·͢
28. େݩͷը૾͋Δ? ϒϥ΢βͰ௚઀ͦͷ URL Λ։͍͍ͯͩ͘͞w
29. ௨৴Τϥʔʁ ΤϥʔϋϯυϦϯάͯ͠ΔՕॴʹ Breakpoint Λઃఆ͢Δ ΤϥʔϋϯυϦϯά͍ͯ͠ͳ͍ͳΒɺϥΠϒϥϦͷதͰ ֘౰ՕॴΛؤுͬͯݟ͚͍ͭͯͩ͘͞ɻ (͔ͬͯɺ΍ͬͯͳ͍ਓͳΜ͍ͯͳ͍ͱࢥ͏͚Ͳ)
30. cache ͯͨ͠ը૾͕͓͔͍͠ʁ (lldb) po let $URL = NSURL(string: “http://~”) (lldb) po let $request = NSURLRequest(URL: $URL) (lldb) po let $data = NSURLCache.sharedURLCache(). cachedResponseForRequest(request)!. data (lldb) po let $path = “/Users/dealforest/cache.png” (lldb) po $data.writeToFile($path, atomically: true)
31. SDWebImage, Kingfisher ͳͲͷ͍ͤʁ // Kingfisher ͷ৔߹ (lldb) po let $URL = NSURL(string: “http://~”) (lldb) po let $resource = Resource(downloadURL: $URL) (lldb) po let $cache = KingfisherManager.sharedManager.cache // memory (lldb) po let $image = $cache.retrieveImageInMemoryCacheForKey($resource.cacheKey) // disk (lldb) po let $image = $cache.retrieveImageInDiskCacheForKey($resource.cacheKey) (lldb) po let $data = UIImagePNGRepresentation($image)! (lldb) po $data.writeToFile(<path>, atomically: true)
32. ͍͔͕Ͱ͔͢ʁʁ
33. গ͠͸ঢ়گ͕೺ѲͰ͖ͨ͸ͣͰ͢
34. Ұ౓͚ͩͳΒ·ͩ͠΋ ͳΜͲ΋ಉ͜͡ͱ͢ΔͱͳΔͱ…
35. ϥΠϒϥϦʹ͢Δͷ΋ͳ…
36. ࢓ํͳ͍ ͦ͏͍͏Ϋϥε࡞Δ͔
37. ଞͷϓϩδΣΫτͰ΋࢖͍͍ͨͳ
38. ίϐϖ
39. ͦ͏͢Δͱ ϓϩμΫτͱؔ܎͕ͳ͍ίʔυ͕ ૿͍͖͑ͯ·͢
40. ͔͠΋ϓϩδΣΫτຖʹ มΘͬͯΓ͢Δͱ…
41. Φϫλ ʘ(^o^)ʗ
42. LLDB ͷ Plugin ʹ͢Ε͹͍͍Μͩʂ
43. analyse_image // ΦϦδφϧը૾Λϒϥ΢βͰ։͖ // ֤ cache ͷը૾Λग़ྗ͠ Preview Ͱදࣔ͢ΔίϚϯυ (lldb) analyse_image “http://~” [original] browser open [request] ok [cache] ok -> “<path_to>/cache.png” [Kingfisher] memory ok -> “<path_to>/kingfisher_memory.png” [Kingfisher] disk ok -> “<path_to>/kingfisher_disk.png”
44. Ͳ͏Ͱ͔͢ʁʁ ͜ΜͳͷϖΞϓϩͰ͞ΕͨΒ
45. ͓͓͓͓͓͓͓ʂʂʂʂʂ Έ͍ͨʹͳͬͪΌ͍·ͤΜ͔ʁʁ
46. ͳΓ·͢ΑͶʁʁ
47. Ͷʁʁ
48. …
49. LLDB ίϚϯυʹ͢ΔϝϦοτΛ ز͔ͭڍ͓͖͛ͯ·͢
50. LLDB Plugin ʹ͢ΔϝϦοτ • σόοά࣌ʹ debug, release Ϗϧυ͕Ͳ͏͔͸ɹɹ ؔ܎ͳ͍ (#ifdef DEBUG ϚΫϩͷढ͍) • ϓϩδΣΫτ͕มΘͬͯ΋ಉ͡؀ڥͰσόοάͰ͖Δ • debug ༻ͷίʔυΛຒΊࠐΉඞཁ͕ͳ͍ • debug ͷҝʹ private method Λݺͼग़͍ͯ͠ΔͷΛ ϦϦʔεϏϧυʹؚΉ৺഑͕ͳ͍
51. ͜Μͳ Plugin ͭ͘Ε͹ศརͰ͢ • ҰఆִؒͰදࣔ͞Ε͍ͯΔ view શͯʹରͯ͠ exerciseAmbiguityInLayout Λ࣮ߦ͢ΔίϚϯυɹɹ (ambigurous layout ରࡦ) • ࣮ػͷϑΝΠϧΛ slack ʹૹ৴͢ΔίϚϯυɹɹɹɹ https://gist.github.com/dealforest/702a848ba0a7a64b139985f5cad885f0 • ݱࡏͷ୺຤ͷঢ়گΛදࣔ͢ΔίϚϯυɹɹɹɹɹɹɹɹɹ free diskɺfree memory, ωοτϫʔΫ઀ଓઌ, ɹɹ OS όʔδϣϯͳͲ
52. Ͳ͏Ͱ͢ʁʁ ΍ͬͯΈͨ͘ͳΓ·͔ͨ͠ʁʁ
53. LLDB Plugin ͷ࡞Γํ͸ ͜ͷޙϒϩάʹॻ͘ͷͰ গʑ͓଴͍ͪͩ͘͞
54. ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠