iOS の HTTP キャッシュについて

by Satoshi Hachiya

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

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Satoshi Hachiya (@jpmartha_jp)

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

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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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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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iOS Ͱ ΩϟογϡΛಡΈࠐ·ͳ͍ํ๏͸ άάΕ͹͙͢ݟ͔ͭΔ

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CachePolicy Λมߋ

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CachePolicy Λมߋ

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ͪͳΈʹ .reloadIgnoringLocalAndRemoteCacheData ͸ ࣮૷͞Ε͍ͯͳ͍ʂ

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ͦΕ͸͓͖ͯ͞

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CachePolicy ͷઃఆ͚ͩͰ͸ ΩϟογϡΛಡΈࠐ·ͳ͍͕ ! อଘ͸͢Δ

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γϛϡϨʔλʔͰΩϟογϡΛ֬ೝ

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

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cache.db Λͷͧ͘ • DB Browser for SQLite

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͜Μͳײ͡

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ΩϟογϡΛಡΈࠐ·ͳ͍ ʢΆ͍ʣ͠ɺ͜ΕͰΑ͘ͳ͍ʁ

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΋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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ΩϟογϡΛಡΈࠐ·ͳ͍͠ อଘ΋͠ͳ͍ํ๏

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configuration.urlCache = nil

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·ͨ͸ .ephemeral

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ͨͩ͠ɺ͍ͣΕ΋ طଘͷΩϟογϡ͸࢒Δ

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

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·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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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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Thanks!