iOSのKeyboard Extensionで日本語入力できるキーボードアプリを作ろう！ - iOSDC2023

೔ຊޠೖྗͰ͖Δ

ΩʔϘʔυΞϓϦΛ࡞Ζ͏ʂ
iOSDC Japan 2023
iOSͷKeyboard ExtensionͰ೔ຊޠIME։ൃʹೖ໳

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azooKey
• ೔ຊޠೖྗػೳ

• ͔ͳ׽ࣈม׵

• ༧ଌม׵

• ֆจࣈɾه߸ྨͷೖྗ

• Ϣʔβࣙॻ

• ֶश

• ޡΓగਖ਼

• ΩʔϘʔυΞϓϦػೳ

• ணͤସ͑

• ϥΠϒม׵

• ΧελϜΩʔ

• ΧελϜλϒ

• ίϐʔཤྺอଘ

• छʑͷઃఆ
https://github.com/ensan-hcl/azooKey
OSSʂ

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࿩͢͜ͱ
• ΩʔϘʔυΞϓϦͷ֓ཁ

• ೔ຊޠೖྗ

• ࢓૊Έ

• ࡞ͬͯΈΑ͏

• ύοέʔδͷ঺հ

• ࣙॻ

• ΩʔϘʔυͷUIʢͷਏ͍ͱ͜Ζʣ

• ·ͱΊ

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ΩʔϘʔυΞϓϦ

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ΩʔϘʔυΞϓϦ
= Keyboard Extension
• ඪ४ΩʔϘʔυͱಉ༷ʹར༻Ͱ͖Δ

• γεςϜͷ΄ͱΜͲͲ͜Ͱ΋ಈ͘

• ػೳ໘͸੍໿ڧΊ

• ϓϥΠόγʔ

• Ϧιʔε

• ίϯςφΞϓϦʹಉࠝͯ͠഑෍͢Δ

• ೔ຊޠೖྗରԠͷΞϓϦ͸গͳ͍

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೔ຊޠೖྗΞϓϦ
• ίϯςφΞϓϦΛ࡞ΔʢઃఆɾνϡʔτϦΞϧʣ

• ΩʔϘʔυͷΠϯλʔϑΣʔεΛ࡞Δ

• ೔ຊޠೖྗΤϯδϯΛ࡞Δʢ͕͜͜ຊؙʣ

• ม׵ΤϯδϯΛ࣮૷͢Δ

• ࣙॻ΋࡞Δ

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೔ຊޠೖྗ

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೔ຊޠೖྗ͍Ζ͍Ζ
• ͍ΘΏΔʮ͔ͳ׽ࣈม׵ʯʢͻΒ͕ͳΛͨ͘͞Μଧͬͯม׵͢Δ΍ͭʣ

• ଟ͘ͷ؀ڥͰσϑΥϧτͷ೔ຊޠೖྗํ๏

• ࠓճ͸͜ΕΛओʹѻ͍·͢

• SKKʢSimple Kana to Kanji conversion programʣ

• iOSʹ΋FlickSKKɹɹɹɹɹɹɹɹɹɹɹɹɹɹɹɹɹɹ͕͋Γ·͢

• ׽ࣈ௚઀ೖྗ

• ׽ࣈΛ௚઀ೖྗ͢Δํࣜɺෳࡶͳม׵ΤϯδϯཁΒͣ
https://github.com/codefirst/FlickSKK

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๲େͳީิ
• Ұͭͷೖྗʹରͯ͠ɺ
ͨ͘͞Μͷީิ͕ߟ͑
ΒΕΔ

• ؒʹ߹͍ͦ͏Ͱ͢

• ਅʹѪ૝࿹૥

• ϚχΞҠૹDeath
ೖྗɿ·ʹ͍͋ͦ͏Ͱ͢
ຐ
Ҡૹ
ؒʹ߹͍ ͦ͏ Ͱ͢
ډ
ʹ
ਅ
ձ͍
ү
Ѫ૝
૯ग़
࿹
ϚχΞ %FBUI
૥

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͔ͳ׽ࣈม׵
• ม׵ΞϧΰϦζϜ

• ୯ޠͷ1-gramͱ඼ࢺͷ2-gramΛ࢖͏
≒ʮ୯ޠ1ͭ͋ͨΓͷείΞ + 2ͭฒΜͩ඼ࢺͷϖΞͷείΞʯΛ࠷େԽ

• ࣙॻσʔλ

• ܗଶૉղੳ༻ࣙॻΛϕʔεʹࣗ࡞͠·͢

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είΞͷߟ͑ํ
• ͔ͳྻʹର͢ΔՄೳͳ׽ࣈม׵ީิ͕େྔʹ͋Δ

• ͨ͘͞Μͷ݁ՌΛධՁͯ͠ɺॱҐ෇͚͍ͨ͠

→֤݁ՌͷʮείΞʯΛܭࢉ

• සൟʹग़ͯ͘Δ୯ޠͷ༏ઌॱҐΛ্͍͛ͨ
→୯ޠͷग़ݱ֬཰͕ߴ͍ީิʹྑ͍είΞΛ༩͑Δ

• จ๏΋গ͠ߟྀ͍ͨ͠
→2ͭฒΜͩ඼ࢺͷϖΞͷग़ݱ֬཰͕ߴ͍ީิʹ
ྑ͍είΞΛ༩͑Δ

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୯ޠͷείΞʢؾ࣋ͪʣ
ࢥ͏
͓ໟ
૝͏
Ա͏
ʮࢥ͏ʯͷස౓͕ߴ͍ͷͰɺʮ͓΋͏ʯͷม׵Ͱ͸ʮࢥ͏ʯΛ༏ઌ

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඼ࢺͷϖΞͷείΞʢؾ࣋ͪʣ
ݴ༿Λ
ॿࢺϮ
࿩͢
ಈࢺ
͸՘ࢠ
ॿࢺϋʴ໊ࢺ
ʮॿࢺϮʯͷ͋ͱʹʮॿࢺϋʯ͸དྷʹ͍͘ͷͰ͜ͷม׵Ͱ͸ʮ࿩͢ʯΛ༏ઌ

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࣮ࡍͷܭࢉ
ຐ
Ҡૹ
ؒʹ߹͍ ͦ͏ Ͱ͢
ډ
ʹ
ਅ
ձ͍
ү
Ѫ૝
૯ग़
࿹
ϚχΞ %FBUI
૥
• ީิ͸ͨ͘͞Μ͋Δ

• είΞ͕࠷େʹͳΔ
Α͏ͳީิΛ୳ࡧ

• ݟ͚ͭΒΕΔͳΒํ๏
͸ͳΜͰ΋͍͍

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࣮ࡍͷܭࢉ
• ޮ཰Α͘ܭࢉ͢ΔͨΊ
ʮViterbiΞϧΰϦζϜʯ
͕࢖͑Δɻ

• ಈతܭը๏ͷҰछ
ຐ
Ҡૹ
ؒʹ߹͍ ͦ͏ Ͱ͢
ډ
ʹ
ਅ
ձ͍
ү
Ѫ૝
૯ग़
࿹
ϚχΞ %FBUI
૥

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࡞ͬͯΈΑ͏

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ϑϧ࣮૷ʢ170ߦʣ
https://github.com/ensan-hcl/KanaKanjiConversionSamples
ensan-hcl/KanaKanjiConversionSamples

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࣮૷ʢWordʣ

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࣮૷ʢNodeʣ

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ࣙॻʢఆٛͷΈʣ

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ม׵ثʢఆٛͷΈʣ

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ม׵ث①

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ม׵ث②

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ม׵ث③

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ม׵ث④

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׬੒ʂ

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࣮༻͢Δʹ͸ʁ
• ෳ਺ͷީิʢN-BestղʣΛఏҊͰ͖ΔΑ͏ʹ͢Δ

• จઅ෼ׂɺ෦෼ม׵ɺ༧ଌม׵ͳͲΛαϙʔτ͢Δ

• ม׵ͷߴ଎Խ

• ΩϟογϡΛར༻ͯ͠෦෼తͳมߋʹରͯ͠ߴ଎ͳॲཧΛߦ͏

• ଥ౰Ͱ͸ͳ͍ީิΛͳΔ΂͘ૣ͘ʹࣺͯΔ

• ࣙॻҾ͖ͷߴ଎ԽɾলϝϞϦԽ

• LOUDS Trieͱ͍͏σʔλߏ଄͕໾ཱͭʢଞʹ΋͍ΖΜͳѹॖख๏͕͋Δʣ

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AzooKeyKanaKanjiConverter
• ࣮૷ࡁΈͷ͔ͳ׽ࣈม׵ύοέʔδ

• https://github.com/ensan-hcl/
AzooKeyKanaKanjiConverter

• SwiftPMͰϓϩδΣΫτʹ௥ՃͰ͖·͢

• ࣙॻʢ഑෍͋ΓʣΛೖΕΕ͹਺ߦͷ
ίʔυͰ͔ͳ׽ࣈม׵Ͱ͖·͢

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ࣙॻ

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ࣙॻʹඞཁͳ΋ͷ
• ͜Μͳײ͡ͷσʔλ͕ཉ͍͠

• ୯ޠͷಡΈɿΘ͍͕ͤͩͩ͘

• ୯ޠͷදهɿૣҴాେֶ

• ୯ޠͷ඼ࢺɿݻ༗໊ࢺ

• ୯ޠͷείΞɿ10

• ඼ࢺͷϖΞͷείΞ

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ࣙॻʹඞཁͳ΋ͷ
• ͜Μͳײ͡Ͱ४උͰ͖Δ

• ୯ޠͷಡΈ→ܗଶૉղੳ༻ͷࣙॻ͔ΒऔΔ

• ୯ޠͷදه→ܗଶૉղੳ༻ͷࣙॻ͔ΒऔΔ

• ୯ޠͷ඼ࢺ→ܗଶૉղੳ༻ͷࣙॻ͔ΒऔΔ

• ୯ޠͷείΞ→Θ͔Βͳ͍

• ඼ࢺͷϖΞͷείΞ→Θ͔Βͳ͍

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ࣙॻʹඞཁͳ΋ͷɿස౓ͷ৘ใ
• είΞͷܭࢉ

• ࣮ࡍͷݴޠσʔλΛܗଶૉղੳ

• ස౓ͷ৘ใΛ༻͍ͯείΞΛܾఆ

• ࣙॻΛੜ੒͢Δ

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ࣙॻͷվળɿ௥ՃͰ΍Δ͜ͱ
• ෳ߹ޠͷੜ੒ɿස౓ͷߴ͍ෳ߹ޠΛҰޠͱͯࣙ͠ॻొ࿥͢Δ

• ܗଶૉղੳ༻ࣙॻͷੜ੒ɿΑΓਫ਼౓ͷߴ͍ղੳΛߦ͏ͨΊɺܗଶૉղੳ༻ࣙ
ॻΛࣗલͰੜ੒

• ਓ໊ࣙॻͷੜ੒ɿ࠷৽ͷਓ໊Λαϙʔτ͢ΔͨΊɺ༗໊ਓͷσʔλΛ࡞Δ

• ಉදهҟಡޠͷௐ੔ɿʮ೔ຊʢχοϙϯɾχϗϯʣʯͷΑ͏ͳಉදهҟಡޠ
ͷείΞௐ੔Λߦ͏

• ௥Ճޠኮɿه߸ͳͲɺࣙॻ΁ͷ௥ՃޠኮΛखಈͰ४උ

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ࣙॻσʔλͷ഑෍
• azooKeyͷࣙॻσʔλΛ഑෍͍ͯ͠·͢

• ϏϧυࡁΈόΠφϦ

• ੜCSVσʔλ

• azooKeyͷREADMEʹϦϯΫ͕͋Γ·͢

• Apache License Version 2.0Ͱ͢

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ΩʔϘʔυͷUIʢͷਏ͍ͱ͜ʣ

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ೖྗঢ়ଶ؅ཧ
• Ϣʔβ͸ΩʔϘʔυΛܦ༝ͤͣʹςΩετΛૢ࡞Ͱ͖Δ

• ςΩετͷબ୒

• ΧʔιϧҠಈ

• ϖʔετ

• ͜ΕΒΛద੾ʹݕ஌ͯ͠ॲཧ͠ͳ͍ͱɺϢʔβʹݟ͍͑ͯΔը໘ͱ
ΩʔϘʔυͷ಺෦ঢ়ଶ͕ζϨͯ͠·͏

• ΩʔϘʔυΛܦ༝͠ͳ͍ૢ࡞ʹରԠͨ͠ೖྗঢ়ଶͷ؅ཧ͕ඞཁ

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ೖྗঢ়ଶ؅ཧɿಓ۩
• Keyboard Extension͕औΕΔͷ͸
ҎԼͷ3ͭͷΈ

• Χʔιϧલͷจࣈྻ:
var documentContextBeforeInput: String?

• બ୒͍ͯ͠Δจࣈྻ:
var selectedText: String?

• Χʔιϧޙͷจࣈྻ:
var documentContextAfterInput: String?

• Keyboard Extension͕Ͱ͖Δͷ͸
ҎԼͷ3ͭͷΈʢ˞ʣ

• ΧʔιϧҐஔ΁ͷจࣈͷૠೖ:
func insertText(String)

• Χʔιϧલͷจࣈͷ࡟আ:
func deleteBackward()

• ΧʔιϧͷҠಈ:
func adjustTextPosition(byCharacterOffset: Int)
• Keyboard Extension͕ड͚औΕΔ௨஌͸ҎԼͷ2ͭͷΈ

• Ϣʔβ͕ʮԿ͔͢Δʯલ: func textWillChange(UITextInput?)

• Ϣʔβ͕ʮԿ͔ͨ͠ʯޙ: func textDidChange(UITextInput?)
ʢ˞ʣਖ਼֬ʹ͸΋͏গ͋͠Γ·͕͢ɺೖྗ؅ཧʹ࢖͑Δ΋ͷ͸͜Ε͚ͩͰ͢

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ೖྗঢ়ଶ؅ཧɿϢʔβʹΑΔΧʔιϧҠಈͷݕग़ྫ
1. Ϣʔβ͕ʮԿ͔͢Δʯ௨஌Λड͚औΔ

2. ͜ͷλΠϛϯάͰʮΧʔιϧͷલޙʯͷςΩετΛอଘ(before)

3. Ϣʔβ͕ʮԿ͔ͨ͠ʯ௨஌Λड͚औΔ

4. ͜ͷλΠϛϯάͰʮΧʔιϧͷલޙʯͷςΩετΛอଘ(after)

5. beforeͷࠨӈΛ࿈݁ͨ͠΋ͷͱɺafterͷࠨӈΛ࿈݁ͨ͠΋ͷ͕ಉ͔֬͡ೝ
→ಉ͡ͳΒɺςΩετΛมԽͤ͞Δૢ࡞Ͱ͸ͳ͘ɺΧʔιϧҠಈͱ෼͔Δ
→beforeͱafterͷࠨͷจࣈ਺Λൺֱ͠ɺ͕ࠩҠಈͨ͠จࣈ਺ͱ෼͔Δ

˞࣮ࡍʹ͸ʮϖʔετʯʮΧοτʯͳͲෳ਺ͷૢ࡞ͷՄೳੑΛಉ࣌ʹௐ΂Δ

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APIͷ೉͍͠ಈ࡞①
• υΩϡϝϯτʹॻ͔Ε͍ͯͳ͍ڍಈ͕ଟ͍

• ΧʔιϧͷҠಈ: func adjustTextPosition(byCharacterOffset: Int)

• υΩϡϝϯτʹΑΔͱҾ਺͸Ҡಈ͢Δจࣈ਺

• ࣮ࡍ͸จࣈ਺Ͱ͸ͳ͘UTF-16ίʔυϙΠϯτ਺

• ᷖᮣʹ࣮૷͢ΔͱֆจࣈͷؒʹΧʔιϧ͕ೖͬͨΓ͢Δ

• Ҡಈ͢ΔલʹΧʔιϧલޙΛ֬ೝ͠ɺίʔυϙΠϯτΛ਺͑Δඞཁ͕͋Δ

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APIͷ೉͍͠ಈ࡞②
• ೖྗதͷจࣈྻʹ৭͚ͭΔ΍ͭ: func setMarkedText(String?, selectedRange: NSRange)

• ৭͸͔֬ʹ͕ͭ͘ɺϢʔβૢ࡞͕Ұ੾τϥοΫग़དྷͳ͘ͳΔ

• બ୒͍ͯ͠Δจࣈྻ: var selectedText: String?

• υΩϡϝϯτʹΑΔͱબ୒͍ͯ͠Δจࣈྻ

• ࣮ࡍ͸ʮબ୒͍ͯ͠Δจࣈྻɻͨͩ͠3ߦҎ্ͷจͷ৔߹͸࠷ॳͱ࠷ޙͷ
1ߦΛ͚ͬͭͨ͘΍ͭʯͱ͍͏ڍಈ

• ࢓༷ʢςΩετϑΟʔϧυଆͷ࣮૷ʹΑΔʣ

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ϝϞϦ੍ݶ
• ΩʔϘʔυΞϓϦʹڐ͞ΕͨϝϞϦ͸60MBલޙʢOSɾσόΠεґଘʣ

• ্ݶ෇ۙͰ͸ಈ࡞͕ۃ୺ʹ஗͘ͳΔͷͰɺ࣮࣭తʹ͔ͦ͜Β10~20MBఔ౓ݮΔ

• ϝϞϦΛফඅ͢ΔཁҼ

• ࣙॻσʔλ

• ணͤସ͑ͷը૾

• ֆจࣈϑΥϯτͷΩϟογϡ

• Ұ౓දࣔ͞Εͨֆจࣈ͸ϝϞϦʹϑΥϯτͷΩϟογϡΛ࢒͢ʢ࡟আෆೳʣ

• ֆจࣈશͯͰ10MBҎ্͍͔࣋ͬͯΕΔ→ֆจࣈΩʔϘʔυͰམͪΔʂ

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UIͷָ͍͠ͱ͜Ζ
• ޻෉ͷ༨஍͕ଟ͍

• ৭ʑͳ഑ྻɺศརͳΩʔɺ৽͍͠UIͳͲ

• δΣενϟͳͲ΋޻෉Ͱ͖Δ

• ΩʔϘʔυͷUIͷՄೳੑΛ୳ΕΔ

• ΩʔϘʔυ͸ಛҟͳΞϓϦέʔγϣϯ

• ΩʔϘʔυ্Ͱʓʓग़དྷͨΒศརͰ͸ʂΛ
࣮ݱͰ͖Δ

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·ͱΊ

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🔥೔ຊޠೖྗ͸Ͱ͖Δʂ

🔥ΩʔϘʔυΞϓϦ΋Ͱ͖Δʂ

🔥೔ຊޠೖྗΞϓϦΛ࡞Ζ͏ʂ

✅ ม׵Τϯδϯɿ͋Δ

✅ ࣮૷αϯϓϧɿ͋Δ

✅ ΦϦδφϧͷ೔ຊޠೖྗΞϓϦɺม׵Τϯδϯɺ഑ྻɺUIɺ࡞Γ·͠ΐ͏ʂ
೔ຊޠೖྗΞϓϦΛ࡞Ζ͏ʂ
Your Own Keyboard🔥🔥

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ϑΟʔυόοΫ͓଴ͪͯ͠·͢

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͓͢͢Ίͷࢿྉ
• Creating a custom keyboard | Apple Developer Documentation, https://developer.apple.com/
documentation/uikit/keyboards_and_input/creating_a_custom_keyboard/

• ޻౻୓, খদ߂޾, ՖԬढ़ߦ, ޲Ҫ३, & ాാ༔հ. (2011). ౷ܭత͔ͳ׽ࣈม׵γεςϜ Mozc. ݴ
ޠॲཧֶձୈ 17 ճ೥࣍େձൃද࿦จू, 948-951.,
https://anlp.jp/proceedings/annual_meeting/2011/pdf_dir/C4-3.pdf

• iOSΧελϜΩʔϘʔυͷ࡞Γํ - Qiita,
https://qiita.com/Kyome/items/4257de4e33d3647085e6

• ಙӬ୓೭. (2012).೔ຊޠೖྗΛࢧ͑Δٕज़ʕมΘΓଓ͚Δίϯϐϡʔλͱݴ༿ͷੈք, ٕ
ज़ධ࿦ࣾ,
https://gihyo.jp/book/2012/978-4-7741-4993-6

• KeyboardKit/KeyboardKit - GitHub, https://github.com/KeyboardKit/KeyboardKit

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iOSのKeyboard Extensionで日本語入力できるキーボードアプリを作ろう！ - iOSDC2023

iOSのKeyboard Extensionで日本語入力できるキーボードアプリを作ろう！ - iOSDC2023

Keita Miwa

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