iOS の HTTP キャッシュについて

potatotips #55 (iOS/Android開発Tips共有会)
https://potatotips.connpass.com/event/100763/

Transcript

1. iOS ͷ HTTP Ωϟογϡʹ͍ͭͯ
   2018.10.9 - potatotips #55
   Satoshi Hachiya (@jpmartha_jp)
   

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2. Satoshi Hachiya (@jpmartha_jp)
   

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3. ࠓ೔ͷ࿩
   • API ͷϨεϙϯεͰߋ৽಺༰͕͙͢ʹ͸൓ө͞Εͳ͔ͬͨ
   • iOS ଆͷܿനΛূ໌͢ΔͨΊʹࢼͨ͠খωλ
   • ͙͢࢖͏Α͏ͳωλͰ͸ͳ͍͕Կ͔͋ͬͨͱ͖ͷࢀߟʹ
   

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4. HTTP Ωϟογϡ
   https://developer.mozilla.org/ja/docs/Web/HTTP/Caching
   ʮաڈʹऔಘͨ͠ϦιʔεΛ࠶࢖༻͢Δͱɺ΢ΣϒαΠτ΍Ξϓ
   ϦέʔγϣϯͷύϑΥʔϚϯε͕େ͖͘޲্͢ΔͰ͠ΐ͏ɻ΢Σ
   ϒΩϟογϡ͸஗Ԇ΍ωοτϫʔΫͷτϥϑΟοΫΛ࡟ݮͯ͠ɺ
   ϦιʔεΛදࣔ͢ΔͨΊʹඞཁͳ࣌ؒ΋୹ॖ͠·͢ɻ HTTP
   ΩϟογϡΛ࢖༻͢Δͱɺ΢ΣϒαΠτͷԠ౴ੑ͕ߴ·Γ·
   ͢ɻʯ
   

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5. https://developers.google.com/web/fundamentals/performance/
   optimizing-content-efficiency/http-caching?hl=ja
   ʮωοτϫʔΫܦ༝Ͱ৘ใΛऔಘ͢Δʹ͸࣌ؒ΋ίετ΋͔͔Γ
   ·͢ɻϨεϙϯε͕େ͖͍ͱɺΫϥΠΞϯτͱαʔόʔؒͷϥ΢
   ϯυτϦοϓΛԿ౓΋܁Γฦ͢ඞཁ͕͋ΔͨΊɺϨεϙϯε͕ར
   ༻Մೳͱͳͬͯϒϥ΢βͰॲཧͰ͖ΔΑ͏ʹͳΔ·Ͱ͕͔͔࣌ؒ
   Γ·͢ɻ͞ΒʹɺϢʔβʔଆͰ͸σʔλͷ௨৴ίετ͕ൃੜ͠·
   ͢ɻͦͷͨΊɺલʹऔಘͨ͠ϦιʔεΛΩϟογϡʹอଘͯ͠࠶
   ࢖༻Ͱ͖Δ͜ͱ͸ɺύϑΥʔϚϯεΛ࠷దԽ͢Δ্Ͱඇৗʹॏཁ
   Ͱ͢ɻʯ
   

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6. iOS Ͱ
   ΩϟογϡΛಡΈࠐ·ͳ͍ํ๏͸
   άάΕ͹͙͢ݟ͔ͭΔ
   

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7. CachePolicy Λมߋ
   

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8. CachePolicy Λมߋ
   

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9. ͪͳΈʹ
   .reloadIgnoringLocalAndRemoteCacheData ͸
   ࣮૷͞Ε͍ͯͳ͍ʂ
   

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11. ͦΕ͸͓͖ͯ͞
    

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12. CachePolicy ͷઃఆ͚ͩͰ͸
    ΩϟογϡΛಡΈࠐ·ͳ͍͕
    !
    อଘ͸͢Δ
    

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13. γϛϡϨʔλʔͰΩϟογϡΛ֬ೝ
    

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14. อଘ৔ॴ
    /Library/Developer/CoreSimulator/Devices/xxx/data/
    Containers/Data/Application/xxx/Library/Caches/
    com.example.bundleid ʹ͋ͬͨ
    

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15. cache.db Λͷͧ͘
    • DB Browser for SQLite
    

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16. ͜Μͳײ͡
    

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17. ΩϟογϡΛಡΈࠐ·ͳ͍
    ʢΆ͍ʣ͠ɺ͜ΕͰΑ͘ͳ͍ʁ
    

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18. ΋ΕͨΒ·͍ͣΩϟογϡ͸อଘ͠ͳ͍
    • ॏཁ৘ใͷ࿙͍͑ʹͭͳ͕ΔεϚϗΞϓϦͷΩϟογϡ໰୊ͱ
    ରࡦɿhttps://www.lac.co.jp/lacwatch/people/
    20180228_001581.html
    • ͨͩͪ͜͠ΒͰ঺հ͞Ε͍ͯΔํ๏ͷ͏ͪɺCapacity = 0 ͩͱ
    ͦΕҎ߱ΩϟογϡΛར༻Ͱ͖ͳ͘ͳΓͦ͏
    

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19. ΩϟογϡΛಡΈࠐ·ͳ͍͠
    อଘ΋͠ͳ͍ํ๏
    

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21. configuration.urlCache = nil
    

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22. ·ͨ͸ .ephemeral
    

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23. ͨͩ͠ɺ͍ͣΕ΋
    طଘͷΩϟογϡ͸࢒Δ
    

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24. ΩϟογϡΛ࡟আ͢Δํ๏
    ͢΂ͯ࡟আ
    ૂ͍ܸͪʢࣦഊʣ
    session.configuration.urlCache?.removeCachedResponse(for: urlRequest)
    

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26. ·ͱΊ
    • લఏɿΩϟογϡ͸ύϑΥʔϚϯε޲্ʹඞཁ
    • requestCachePolicy Λมߋ͚ͨͩ͠Ͱ͸ΩϟογϡΛอଘ͢Δ
    • urlCache = nil ʹมߋͯ͠΋طଘͷΩϟογϡ͸࢒Δ
    ʢ.ephemeral ΋ʣ
    • removeAllCachedResponses Ͱ͢΂ͯ࡟আ͢Δ
    • Capacity = 0 ʹ͢ΔͱͦΕҎ߱ΩϟογϡΛར༻Ͱ͖ͳ͍ʁ
    

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27. ࢀߟ
    • URL Loading Systemɿhttps://developer.apple.com/
    documentation/foundation/url_loading_system
    • Ωϟογϡͷڍಈɿhttps://developer.apple.com/
    documentation/foundation/nsurlrequest/cachepolicy/
    useprotocolcachepolicy
    • Ωϟογϡ΁ͷΞΫηεɿhttps://developer.apple.com/
    documentation/foundation/url_loading_system/
    accessing_cached_data
    

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28. Thanks!
    

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