逆向きUIの世界〜iOSアプリのRTL言語対応〜

by akatsuki174

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ٯ޲͖UIͷੈք ʙiOSΞϓϦͷRTLݴޠରԠʙ iOSDC Japan 2025 09/21 @akatsuki174

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ࣗݾ঺հ

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• @akatsuki174 • Android/iOS/FlutterΤϯδχΞ • גࣜձࣾΏΊΈॴଐ • Android/FlutterνʔϜ • ࠓͷ࢓ࣄ͸Android/iOS • 2ࣇͷ฼

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ࠓ೔ͷ࿩

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࿩͢ର৅ • SwiftUI͕ϝΠϯ • iOS͕ϝΠϯ • ʙiOS 18ܥɺXcode 16ܥ

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RTLݴޠରԠͱ͸

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RTLݴޠͱ͸ • จࣈ΍UIͷ഑ஔ͕ʮӈ͔Βࠨʯʹ޲͔ͬͯਐΉݴޠɹɹɹ ʢRight to Leftݴޠʣ • ୅දతͳRTLݴޠ • ΞϥϏΞޠ • ϔϒϥΠޠ • ΢ϧυΡʔޠ etc…

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RTLݴޠରԠ͞Εͨঢ়ଶͱ͸ ຋༁͕ೖ͍ͬͯΔ͜ͱʹՃ͑ͯ… • ϨΠΞ΢τ͕ࠨӈ൓స͍ͯ͠Δ • ํ޲ੑΛ࣋ͭΞΠίϯ͕ࠨӈ൓స͍ͯ͠Δ • RTLݴޠɺLTRݴޠ͕ࠞࡏ͍ͯͯ͠΋ਖ਼͍͠ฒͼʹͳ͍ͬͯΔ etc…

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RTLݴޠରԠͷඞཁੑ • RTLݴޠͰ͋ΔΞϥϏΞจࣈͷ࢖༻ਓޱ͸6ԯ6ઍສਓ • ΞϧϑΝϕοτͱதࠃจࣈʹ͍࣍ͰੈքͰ3൪໨ʹଟ͘ॻ͔Εͯ ͍Δݴޠ • RTLݴޠϢʔβʔʹͱͬͯɺLTRϨΠΞ΢τ͸ҧ࿨ײ͕͋Δ

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ͳΜ͔େมͦ͏͡ΌͶʁ • ͍͍ͩͨ͸OSɺϑϨʔϜϫʔΫଆ͕ࣗಈͰରԠͯ͘͠ΕΔ • ͕ɺ։ൃऀ͕खಈରԠ͢΂͖ͱ͜Ζ΋͋Δ

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લఏɿԿ΋͠ͳ͍ͱRTLϨΠΞ΢τʹͳΒͳ͍ • ʮͱΓ͋͑ͣγεςϜݴޠΛΞϥϏΞޠʹͯ͠ϨΠΞ΢τ่Ε͕ ͳ͍͔֬ೝͯ͠ΈΔ͔ʯͱࢥͬͯ΋ɺͦͷ··ͩͱLTRϨΠΞ΢ τͷ·· • طଘݴޠͷίϐϖͰ͍͍͔Β຋༁ϑΝΠϧΛೖΕΔ͔ɺޙड़͢Δ σόοά༻ͷઃఆͰڧ੍RTLϨΠΞ΢τʹ͢Δ

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஫ɿҰ֓ʹʮRTLݴޠʯͱׅΕͳ͍ • ྫɿϔϒϥΠޠ͸جຊRTLݴޠͰ͸͋Δ͕ɺ਺஋ͳͲ͸LTRʹͳΔ • ରԠ͢Δݴޠʹ͓͍ͯԿ͕ਖ਼͍͔͠͸ࣄલʹௐ΂͓ͯ͘΂͖

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RTLݴޠରԠʹؔ͢Δ ެࣜ৘ใ

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ެࣜ৘ใ • ͍ΖΜͳͱ͜ΖʹRTLʹؔ͢Δެࣜ৘ใ͕͋Δ • WWDCͷಈը • Human Interface Guidelines etc…

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Human Interface Guidelines • ʮRight to leftʯͱ͍͏ষ͕͋Δ • RTLϨΠΞ΢τશൠΛͬ͘͟Γ໢ཏ͍ͯ͠Δ • σβΠφʔ͞Μʹ͸·͔ͣ͜͜Βݟͯ΋Β͏ͷ͕ྑͦ͞͏

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Design for Arabic / WWDC22 • Human Interface GuidelinesΑΓৄࡉͳ৘ใ͕ࡌ͍ͬͯΔ • σβΠφʔ͞Μʹ2൪໨ʹݟͯ΋Β͏ͳΒ͜Ε͔΋͠Εͳ͍

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Get it right (to left) / WWDC22 • ։ൃऀ޲͚ͷRLTݴޠରԠಈը • ۩ମతʹͲ͏࣮૷ͨ͠Β͍͍͔͕঺հ͞Ε͍ͯΔ

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ʮࣗಈͰʯ͞ΕΔ RTLݴޠରԠ

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ӳޠ؀ڥ ΞϥϏΞޠ؀ڥ

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RTLݴޠରԠΫΠζ

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͜ͷΫΠζͷҙٛ • શ෦OSɺϑϨʔϜϫʔΫଆ͕ରԠͯ͘͠ΕΔΘ͚Ͱ͸ͳ͍ • ػցతʹʮਖ਼͍͠RTLσβΠϯʹͳ͍ͬͯΔ͔ʁʯΛςετ͢Δ ͷ͸೉͍͠ʢޙड़ʣ • ࣗ෼ͷײ֮Λཆ͏ඞཁ͕͋Δ

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Q1. ͜ͷΞΠίϯ͸RTL༻ʁ

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A1. 🙆 • εϐʔΧʔ෦෼͸Իͷग़Δํ޲Λࣔ͢ͷͰ൓సͤ͞Δ • ࣼઢ෦෼͸ແޮɺېࢭΛද͕͢ʗͰ΋ʘͰ΋ҙຯ͸มΘΒͳ͍Β͍͠ • Apple͸ʘͰ౷Ұ͍ͯ͠ΔΒ͍͠

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೔ຊޠ؀ڥ ΞϥϏΞޠ؀ڥ J04 "OESPJE

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Q2. ͜ͷΞΠίϯ͸RTL༻ʁ

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A2. 🙆 • ͜ͷϖϯ͕ӈʹ܏͍͍ͯΔͷ͸ӈར͖ͷਓ͕ଟ͍͔Β

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Q3. ͜ͷঢ়ଶ͸RTLରԠ͕͞Ε͍ͯΔʁ

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A3. 🙅 • Human Interface GuidelinesʹΑΔͱɺஈམʢ3ߦҎ্ͷςΩετͰఆ ٛ͞ΕΔʣͷ഑ஔ͸ஈམͷݴޠͱҰகͤ͞ΔΑ͏ʹͱॻ͔Ε͍ͯΔ

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Q4. ͜ͷঢ়ଶ͸RTLରԠ͕͞Ε͍ͯΔʁ

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A4. 🙆 • ࣌ܭදݱ͸RTLݴޠݍͰ΋ʮ࣌ܭճΓʯ • ProgressViewͷCircularProgressViewStyle͸RTLݴޠͰ΋ʮ࣌ܭճΓʯ

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ʮखಈͰʯ΍Δ RTLݴޠରԠ

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ϨΠΞ΢τ

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left/rightͰॻ͍͍ͯΔͱ͜Ζ • leading/trailing͸ݴޠʹΑͬͯҧ͏͕ɺleft/right͸ڞ௨ • left/rightͰॻ͍͍ͯͨΒ΋ͪΖΜϨΠΞ΢τ͕ݻఆ͞Εͯ͠·͏

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ӳޠ؀ڥ ΞϥϏΞޠ؀ڥ

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ӳޠ؀ڥ ΞϥϏΞޠ؀ڥ

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Ұ෦ͷϨΠΞ΢τ • Կ͔͠Βͷཧ༝ͰRTLͱLTRͰϨΠΞ΢τΛผʹ͍ͨ͠৔߹͸ɺ ୺຤ͷϨΠΞ΢τํ޲Λ൑ผ͔ͯ͠Β৚݅෼ذͰUIΛग़͠෼͚Δ

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ํ޲Λݻఆ͍ͨ͠৔߹ • RTLͰ΋LTRͰ΋ಉ͡ϨΠΞ΢τʹ͢Δ͜ͱ͕Ͱ͖Δ • UIKitͱSwiftUI྆ํͷํ๏Λ঺հ

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ΞϥϏΞޠ؀ڥʢରԠલʣ ΞϥϏΞޠ؀ڥʢରԠޙʣ

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RTL,LTRݴޠࠞ߹ͷςΩετ • جຊతʹ͸͍͍͔Μ͡ʹ΍ͬͯ͘ΕΔ • ͕ɺྫ͑͹ύϥϝʔλ͖ͭURLΛͻͱ͖ͭͮͷLTRͱղऍͰ͖ͣ ʹόϥόϥʹฒ΂ΒΕͯ͠·͏͜ͱ͕͋Δ

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LRM,RLMͰڬΉ • LRM (Left-to-Right Mark) • Unicode: \u{200E} • ςΩετͷྲྀΕΛࠨˠӈʹڧ੍͍ͨ͠ͱ͖ʹ࢖͏੍ޚจࣈ • RLM (Right-to-Left Mark) • Unicode: \u{200F} • ςΩετͷྲྀΕΛӈˠࠨʹڧ੍͍ͨ͠ͱ͖ʹ࢖͏੍ޚจࣈ

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˞͜ͷίʔυ͸खΛՃ͑ͳͯ͘΋ਖ਼͍͠ޠॱͰදࣔ͞Ε·͢

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ը૾

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Ұ෦ͷը૾ • RTLͱLTRͰҟͳΔ΋ͷΛද͍ࣔͨ͠৔߹͸ɺAsset Catalogʹ྆ ํͷը૾ΛೖΕΔ

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ͲΜͳը૾Λ൓సͤ͞Δ΂͖͔ • ʮํ޲ੑͷ͋Δ΋ͷʯͱݴΘΕͯ΋… • SF SymbolsΛࢀߟʹ͢Δͷ͕ྑͦ͞͏

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਺ࣈ

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਺ࣈ͕ೖͬͨςΩετ • ಉ͡ݴޠݍͰ΋ɺ஍ҬʹΑͬͯͲΜͳ਺ࣈදه͕Ұൠతͳͷ͔͕ ҟͳΔ • ྆ํͰද่ࣔΕ͕ͳ͍͔֬ೝͨ͠ํ͕͍͍ • ਺ࣈ΋ϩʔΧϥΠζ͞ΕΔঢ়ଶʹͳ͍ͬͯΔ͔֬ೝ͢Δ

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ه߸෇͖਺ࣈ • ʮ%ʯʮ-ʯͳͲͷه߸͕਺ࣈʹͭ͘৔߹͕͋Δ • ಉ͡RTLݴޠͰ΋ɺ਺ࣈͷલʹͭ͘৔߹΋͋Ε͹ޙΖʹͭ͘৔߹ ΋͋Δ • ࣗ෼Ͱه߸Λ෇༩͢ΔͷͰ͸ͳ͘ɺ਺஋formatterΛ࢖͏͜ͱ

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88%$(FUJUSJHIU UPMFGU IUUQTEFWFMPQFSBQQMFDPNXXED

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ͦͷଞ

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WebView΍ͦͷଞ֎෦࿈ܞ • WebViewͷத਎͕ະରԠʹͳΒͳ͍Α͏ʹ • ͦͷଞݴޠίʔυ΍ࠃίʔυΛSDKͳͲʹ౉͍ͯ͠ΔՕॴ͕͋ͬ ͨΒ஫ҙ

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ʮӈʯʮࠨʯͷςΩετ • ʮࠨʹεϫΠϓͯ͠࡟আ͍ͯͩ͘͠͞ʯͳͲͷจݴ͸࣮ࡍͷಈ࡞ ͱҟͳΔ͔΋

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ݻఆαΠζͷϨΠΞ΢τ • ҰൠతʹΞϥϏΞޠͷํ͕௕͍ͷͰɺݻఆαΠζͷUIͩͱ่ΕΔ ͱ͜Ζ͕͋Δ͔΋ • ՄมϨΠΞ΢τʹͨ͠Γɺ৔߹ʹΑͬͯ͸຋༁Λௐ੔ͨ͠Γ͢Δ

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(option)ϑΥϯτͷมߋ • ҰൠతʹΞϥϏΞޠͷํ͕খ͘͞ݟ͑Δ • ΞϥϏΞޠͷϑΥϯτΛ10%େ͖͘͢ΔͱಡΈ΍͘͢ͳΔ 88%$%FTJHOGPS"SBCJD IUUQTEFWFMPQFSBQQMFDPNKQWJEFPTQMBZXXED

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88%$%FTJHOGPS"SBCJD IUUQTEFWFMPQFSBQQMFDPNKQWJEFPTQMBZXXED (option)ߴ͞ͷௐ੔ • ൃԻه߸ɺࣝผه߸ͳͲ͕͋ΔͱΞϧϑΝϕοτΑΓΞϥϏΞจ ࣈͷํ͕ߴ͘ͳΔ • ্Լ͕Χοτ͞Εͳ͍Α͏ʹؾΛ෇͚Δ

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ͲͷΑ͏ʹςετ͢Δ͔

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લఏ • ػցతʹશ෦ʮRTLσβΠϯରԠͰ͖͍ͯΔ͔ʁʯΛςετ͢Δ ͷ͸ʢͨͿΜʣແཧ • ಠࣗΞΠίϯΛ࢖͍ͬͯͨΒʮ͜Ε͸൓స͢΂͖ͳͷ͔ʁʯ͸ ਓ͕ؒ൑அ͢Δ͔͠ͳ͍ • ςετͱ͸ݴ͏΋ͷͷɺ࠷ॳʹ͜ΕΛ΍ͬͯ޻਺ײΛ೺Ѳͨ͠ํ ͕͍͍ͱࢥ͏

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ओͳνΣοΫϙΠϯτ • ϨΠΞ΢τɺը૾ɺΞχϝʔγϣϯ͕ਖ਼͍͠޲͖ʹͳ͍ͬͯΔ͔ • RTLݴޠɺLTRݴޠ͕ࠞࡏ͍ͯͯ͠΋ਖ਼͍͠ฒͼʹͳ͍ͬͯΔ͔ etc…

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༏ઌ͢ΔݴޠΛมߋͯ͠໨ࢹ • Ұ൪ຊ෺ʹ࣮ۙͯ֬͘ͳํ๏ • νΣοΫϙΠϯτʹैͬͯɺ͓͔͍͠ͱ͜Ζ͕ͳ͍͔Λ֬ೝ͢Δ • ͨͩ͠ɺRTLݴޠͷ຋༁ϑΝΠϧ͕ೖͬͯͳ͍ͱ൓స͠ͳ͍

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౾஌ࣝ • ʮRTLݴޠʹͨ͠ΒઃఆΞϓϦ͕ಡΊͳ͘ͳͬͯݩʹ໭ͤͳ͍ʯ ͱͳͬͨ৔߹͸ผ୺຤ͰGoogleϨϯζΛ࢖͏ͱศར • ΞϓϦ͕ʮ༏ઌ͢ΔݴޠʯʹରԠ͍ͯ͠ΔͳΒͦͬͪΛ࢖ͬͯ΋

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εΩʔϜΤσΟλΛฤू • εΩʔϜΤσΟλʹApp Language͕͋ΓɺRTLݴޠʹͨ͠Γɺ PseudolanguageʢՍۭݴޠʣʹͰ͖Δ • ࣮ߦϑΝΠϧʹRTLݴޠ͕ೖͬͯͳͯ͘΋ςετͰ͖ͯศར

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Right-to-Left Pseudolanguage • UI ϨΠΞ΢τͷํ޲͚ͩΛRTLʹ͢Δ • จࣈྻ͸ͦͷ·· • ϨΠΞ΢τ͕ਖ਼͘͠RTLݴޠରԠͰ͖͍ͯΔ͔Λ֬ೝͰ͖Δ

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௨ৗϏϧυ 3JHIUUP-FGU1TFVEPMBOHVBHFࢦఆ

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SwiftUIͷϓϨϏϡʔͰ໨ࢹ • SwiftUIͷϓϨϏϡʔͰRTL༻LTR༻ϓϨϏϡʔΛ࡞੒͢Δ • StoryboardͩͱͰ͖ͳͦ͏

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࠷ޙʹ

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ࠓ೔ͷ·ͱΊ • RTLݴޠΛ࢖͍ͬͯΔਓ͸͔ͳΓଟ͍ͷͰରԠͨ͠ํ͕͍͍Α • OSɺϑϨʔϜϫʔΫଆ͕উखʹ͍͍͔Μ͡ʹͯ͘͠ΕΔ͜ͱ͕ଟ ͍Α • Ͱ΋ࣗಈͰରԠ͞Εͳ͍ͱ͜Ζ΋͋Δ͔ΒؤுͬͯରԠ͠Α͏Ͷ

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ݸਓతͳײ૝ • σβΠφʔ͞Μͱ૬ஊͭͭ͠ɺͰ͖Δ͚ͩඪ४UIίϯϙʔωϯτ ͰσβΠϯΛ࡞Δͷ͕ྑͦ͞͏ • ஍ຯʹେมͳͷͰ޻਺͸ଟΊʹऔͬͨํ͕ྑͦ͞͏ • ωΠςΟϒͷਓʹνΣοΫͯ͠΋Β͏ͷ͕Ұ൪҆৺…

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͓ΘΓ