iOS アプリ開発 Swift3 移行の闇

by Yuka Ezura

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iOS ΞϓϦ։ൃ  Swift3 Ҡߦͷҋ ezura

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iOS ΤϯδχΞͷਓ

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iOS ΤϯδχΞͱ࢓ࣄͯ͠Δਓ

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·ͩɺଉͯ͠·͔͢ (´ɾωɾʆ)ʁ

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"\(self)" • ezura (@eduraaa) • iOS ΤϯδχΞ • ࠷ۙ͸ Swift2 ͔Β Swift3 ΁ͷҠߦͷ͓࢓ࣄ

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"\(self)" • ezura (@eduraaa) • iOS ΤϯδχΞ • ࠷ۙ͸ Swift2 ͔Β Swift3 ΁ͷҠߦͷ͓࢓ࣄ

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఻͍͑ͨ͜ͱ

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Swift3 ରԠ͍ͯ͠ͳ͍  iOS ΤϯδχΞͷํ    ֮ޛ͍ͯͩ͘͠͞

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iOS ΤϯδχΞͱ࢓ࣄ͍ͯ͠Δํ    ԾʹɺSwift3 Ҡߦͷਐḿ͕ѱͯ͘΋  ͝ཧղͷ΄ͲɺΑΖ͓͘͠ئ͍͠·͢…

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Index • ҋʹࢸΔܦҢ • ҋΛ৐Γӽ͑ΔͨΊʹ • Swift3 ΁ͷॻ͖׵͑ޙʹൃੜͨ͜͠ͱ

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ҋʹࢸΔܦҢ

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Ή͔͠Ή͔͠ɺ  iOS ΞϓϦ͸ Objective-C ͱ͍͏ݴޠͰ  ॻ͘͜ͱ͕ඪ४Ͱͨ͠

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ಥવͷͷܒࣔ

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Swift ͱ͍͏ݴޠΛ࡞ͬͨΑ  ࠓޙ͸͜ΕΛਪ͍ͯ͘͠Α

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༷ͷ࣊͝൵

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(ͨͩ͠ɺ੍ݶ͋Γ) Objective-C ͱ Swift ͸  ૬ޓʹݺͼग़͢͜ͱ͕Ͱ͖·͢  Ὃ طଘͷίʔυ͸ͦͷ··࢖༻Մೳ

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͔ͯ͘͠ɺ  iOS ΞϓϦ͸ Objective-C ͱ Swift ͷ  ࠞࡏ͢ΔੈքͱͳΓ·ͨ͠ ݴޠͷઃܭࢥ૝͕ҧ͏ೋਓɺͦͷ࿈ܞ͸ଟ͘ͷҋΛ࢈Έ·ͨ͠

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৽͘͠ॻ͘෦෼͸ Swift2 ʹ͠Α͏  ͱ͍͏ྲྀΕ

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طଘͷίʔυ΋   Swift2 ʹஔ͖׵͑Α͏ͱ͍͏ಈ͖

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ฏ࿨͕๚Ε…

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Swift3 ϦϦʔε  ௒ഁյతΞοϓσʔτ

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Xcode8.2 (࣍ͷόʔδϣϯ) Λ  ࠷ޙʹ Swift2 ͷαϙʔτΛ੾ΔΑ

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Swift3 ΁ͷҠߦ͸ۙʑඞਢʹ

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ͱ͸͍͑ɺ3 ೔͘Β͍ͰऴΘΔͰ͠ΐʁ  ίϯόʔδϣϯπʔϧ͋Δ͠…

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Θͨ͋ΊΑΓ΋؁͍ߟ͑Ͱͨ͠

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Error ਺ 0 200 400 600 800 ೔਺ 1 2 3 4 5 6 7 8 9 Τϥʔ਺ (ୀࣾ࣌఺)

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Կ͕͋ͬͨͷ͔ • Ұ౓ʹΤϥʔΛݕग़Ͱ͖ͳ͍ • ίϯόʔδϣϯπʔϧ͕·ͱ΋ʹಈ͔ͳ͍ • Swift ͱ Objective-C ͷ࿈ܞͷมߋ༝དྷͰɺةݥͳ ෦෼͕͋Δ • ϥΠϒϥϦ෦෼ͷมߋ͸શͯࣗ෼Ͱ • ϥϯλΠϜΤϥʔɺҙਤ͠ͳ͍ڍಈͷରԠ

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Error ਺ 0 200 400 600 800 ೔਺ 1 2 3 4 5 6 7 8 9 Τϥʔ਺ (ୀࣾ࣌఺)

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ҋΛ৐Γӽ͑ΔͨΊʹ

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Swift2 ͷ͏͔ͪΒରࡦ͢Δ

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Swift2 Ͱॻ͍͍ͯΔਓ • Swift ίʔσΟϯάΨΠυϥΠϯʹଇͬͯॻ͍͓ͯ ͖·͠ΐ͏ • Objective-C ͱͷ࿈ܞͰ IUO Λ࢖Θͣ Optional Ͱ ѻ͏Α͏ʹ͠·͠ΐ͏  (nullability ΞϊςʔγϣϯΛࢦఆ͍ͯ͠ͳ͍৔߹) • RxSwift ͷഇࢭ༧ఆͷϝιου (`onNext` ౳) Λ࢖Θ ͳ͍Α͏ʹ͠·͠ΐ͏

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ॻ͖·ͨ͠ʂ٩( 'ω' )و ࠓɺSwift2 Ͱॻ͍͍ͯΔಉ๔ୡ΁ɻ࠷௿ݶ΍ͬ ͓͖͍ͯͨɺSwift2 ͷ··Ͱ࢝ΊΔ Swift3 ରࡦ

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Swift3 Ҡߦ్தͷਓ ಉࢤΑɺ͕Μ͹ͬͯ

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Swift3 ίϯύΠϧΤϥʔղܾͷ  ޙ೔ஊ

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ϥϯλΠϜΤϥʔ • NSURL ͱ URL • Objective-C ͷδΣωϦοΫܕʹ Swift ͔ΒΞΫηε  (Swift2 Ͱ͸େৎ෉ͩͬͨͷͰ͢…) • Objective-C Realm ࢮ͢  (ݹ͍όʔδϣϯͩͬͨͷ΋ཁҼ) • ϚΠάϨʔγϣϯπʔϧ͕ͱΓ͋͑ͣ `!` ͚ͭͯͨ

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༧ظͤ͵ڍಈ • protocol ͷϝιου໊ͷม׵࿙Ε  (optional ࢦఆ΍ default ࣮૷͍ͯ͠Δϝιουͩͱ ؾ͕͖ͭʹ͍͘) • ϚΠάϨʔγϣϯπʔϧ͕ྑ͘ͳ͍Ωϟετͯ͠Δ

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·ͱΊ

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• ༧૝Ҏ্ʹ Swift3 ରԠʹ͸͕͔͔࣌ؒΔ  (Ұ࣌ظɺίϯύΠϧΤϥʔ͕ݮͬͯ΋ίϯύΠϥ͕ΤϥʔΛൃݟͰ ͖͍ͯͳ͍͚ͩͷՄೳੑ͕େɻͦΕͰ޻਺Λݟੵ΋Δͷ͸ةݥ) • Swift2 ͷ͏͔ͪΒ Swift3 Λҙࣝͯ͠ॻ͍͓ͯ͘ͱָ • ίϯύΠϧΤϥʔղܾͷ͋ͱ΋ɺ৽ͨͳઓ͍͕࢝·Δ

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͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠