SwiftUI Freed From ViewController

by USAMI Kosuke

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SwiftUI ʹΑΔ ViewController ͔Β ͷղ์ USAMI Kosuke Fenrir Inc.

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SwiftUI ͱ͸

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SwiftUI • 6݄ͷWWDCͰൃද͞Εͨ৽͍͠UIϑϨʔϜϫʔΫ • ݱࡏϕʔλ൛ɺ9݄ʹਖ਼ࣜϦϦʔεͷݟࠐΈ • ࠓճͷ࿩͸ɺݱࡏ Apple Developer αΠτͰҰൠެ։͞ Ε͍ͯΔ಺༰Λݩʹ͍ͯ͠·͢

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SwiftUI ͷಛ௃ • એݴܕγϯλοΫε • σβΠϯπʔϧ • ͢΂ͯͷAppleϓϥοτϑΥʔϜͰωΠςΟϒʹ

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એݴܕγϯλοΫε • UIΛγϯϓϧͳهड़Ͱ࣮ݱ • σʔλόΠϯσΟϯά

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σβΠϯπʔϧ • ίʔυͱϓϨϏϡʔͷಉظ • ίʔυͰ΋ϓϨϏϡʔͰ΋ฤूͰ͖Δ • ෳ਺ͷϓϨϏϡʔΛಉ࣌ʹ֬ೝͰ͖Δ

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͢΂ͯͷAppleϓϥοτϑΥʔϜͰ • ैདྷ͸ iOS / watchOS / tvOS / macOS ͰҟͳΔϑϨʔ ϜϫʔΫͩͬͨ • ࠓޙ͸ SwiftUI Λ֮͑Ε͹શ෦࡞ΕΔ

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SwiftUI ͱ ViewController

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UIKit ͔Βݟͨ SwiftUI ͷಛ௃ • ViewController ͕ͳ͍ • Storyboard ͕ͳ͍

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ViewController • ViewController ͸ॏཁͳ໾ׂͷଘࡏͩͬͨ • ͔͠͠ҰํͰɺѻ͍͕೉͍͠໽հͳଘࡏͩͬͨ • ࣮૷͕;͘Ε͕͋Δ܏޲͕ڧ͔ͬͨ • ֤छΞʔΩςΫνϟઃܭʢMVCɺMVVMɺClean ArchitectureɺFlux ͳͲʣΛ࢖͏ࡍʹɺ ViewController ΛͲͷཱͪҐஔͰѻ͏ͷ͔͕೉͔ͬͨ͠

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ղ์ • ΋͏ ViewController Ͱ೰·ͳ͍͍ͯ͘

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ViewController ͷ໾ׂ • ը໘ͷ؅ཧ • UIύʔπͷϨΠΞ΢τ • ը໘ͷϥΠϑαΠΫϧॲཧ • ը໘ͱσʔλͱͷ࿈ܞ • Ϣʔβ͔ΒͷೖྗΛड͚෇͚Δ • σʔλͷมߋΛը໘ʹग़ྗ͢Δ

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SwiftUI Ͱ͸ • View • UIύʔπͷϨΠΞ΢τ • ը໘ͷϥΠϑαΠΫϧॲཧ • Combine • Ϣʔβ͔ΒͷೖྗΛड͚෇͚Δ • σʔλͷมߋΛը໘ʹग़ྗ͢Δ

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໾ׂͷ෼཭ • ΞʔΩςΫνϟઃܭͰ͸ View ͱ Model ͷ෼཭͕େࣄ • ͦͷͨΊʹ View ͱσʔλόΠϯσΟϯάͱͷ෼཭͕େࣄ • ViewController ͸ͦͷ෼཭Λ๦͕͛ͪͩͬͨ • SwiftUI ͸ View ͱ Combine ͱʹ෼཭ͨ͠

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֤छΞʔΩςΫνϟͷ࣮૷ͷ࠶ߟ • MVCɺMVVMɺClean ArchitectureɺFlux ͳͲͰɺ ViewController ΛͲ͜ʹҐஔ͚ͮΔ͔೉͍͠ • View ͳͷ͔ Controller ͳͷ͔ Presenter ͳͷ͔ɺ ͋Δ͍͸ผͷԿ͔͔ • SwiftUI Ͱ͸ͦͷ೰Έ͔Β͸ղ์͞ΕΔ • ͨͩ͠σʔλόΠϯσΟϯάͷѻ͍ํ͸ࠓޙͷ՝୊

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SwiftUI ͱ UIKit

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UIKit Λར༻͢Δ • ݱঢ়Ͱ͸ɺUIKit ͰͰ͖͍ͯͨ͜ͱ͕ SwiftUI ͰͰ͖ͳ͍ έʔε͕͋Δ • UIίϯϙʔωϯτ͕଍Γͳ͍ʢࠓޙ௥Ճ͞ΕΔ͔Ͳ͏͔͸ͳ Μͱ΋ݴ͑ͳ͍ʣ • ͦͷͨΊɺ෦෼తʹ͸ UIView ΍ UIViewController ͷॿ ͚ΛआΓΔඞཁ͕ग़ͯ͘Δ

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UIView ͷར༻ • UIViewRepresentable protocol • ެࣜνϡʔτϦΞϧͰ͸ɺMapKit ͷ MKMapView Λ SwiftUI ͷ View ͱͯ͠ѻ͏ྫ͕঺հ͞Ε͍ͯΔ

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UIViewController ͷར༻ • UIViewControllerRepresentable protocol • ެࣜνϡʔτϦΞϧͰ͸ɺUIPageViewController Λ SwiftUI ͷ View ͱͯ͠ѻ͏ྫ͕঺հ͞Ε͍ͯΔ

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݁ہ ViewController ࢖ͬͯΔ Ͷʁ • ͱ͸͍͑ɺSwiftUI ͷ View ͷ࿮૊Έʹ͸͓͞·͍ͬͯΔ • ΞʔΩςΫνϟઃܭͱͯ͠͸ɺViewController Λҙࣝ͠ͳ ͯ͘ྑ͘ͳͬͨ͜ͱʹมΘΓ͸ͳ͍

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·ͱΊ

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·ͱΊ • SwiftUI ͷಋೖʹΑͬͯɺΞʔΩςΫνϟઃܭͷࡍʹ ViewController ʹ͍ͭͯ಄Λ೰·ͤΔඞཁ͸ͳ͘ͳͬͨ • γϯϓϧͳ࣮૷Ͱ UI ͕࡞ΕΔΑ͏ʹͳͬͨ • ৽͍͠σʔλόΠϯσΟϯάͷ࢓૊ΈʢSwiftUI + CombineʣΛͲͷΑ͏ʹΞʔΩςΫνϟઃܭͱ༥࿨ͤ͞Δ͔͸ ࠓޙͷ՝୊

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ࢀߟࢿྉ • SwiftUI (https://developer.apple.com/xcode/ swiftui/) • SwiftUI Tutorials (https://developer.apple.com/ tutorials/swiftui/) • SwiftUI References (https:// developer.apple.com/documentation/swiftui/) • WWDC19 Videos