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Build programmatic UI 
 with Xcode Previews Xcode Previews ͷվળ఺΍ Tips Λཁ໿ͯ͠঺հ͠·͢ SwiftѪ޷ձεϐϯΦϑ WWDC23ηογϣϯཁ໿ձ

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঺հ͢Δ͜ͱ • Xcode Previews ͱ͸ʁ • Xcode Previews ͷվળ఺ ‣ `#Preview` macro ͷొ৔ ‣ Widgets ͷ Preview ͕Մೳʹ ‣ Previews Λදࣔ͢ΔσόΠε͕બ୒Մೳʹ • Xcode Previews Λར༻͢Δࡍͷ Tips ‣ Library targets Ͱ Preview ͢Δํ๏ ‣ Previews Ͱ assets ͳͲΛར༻͢Δํ๏ ‣ Previews ͰσόΠεݻ༗ͷػೳΛར༻͢Δํ๏

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Xcode Previews ͱ͸ʁ

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Color Scheme Variants

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Orientation Variants

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Dynamic Type Variants

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ҧ͏ View ʹҠΓͳ͕Β࡞ۀͰ͖Δ Pin Preview

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https://developer.apple.com/wwdc23/10252

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Xcode Previews ͷվળ఺

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`#Preview` macro ͷొ৔ https://developer.apple.com/wwdc23/10252

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Con fi gurations ΋ઃఆͰ͖Δ https://developer.apple.com/wwdc23/10252

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UIKit ΍ AppKit Ͱ΋ Preview ͕؆୯ʹ https://developer.apple.com/wwdc23/10252

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Widgets ͷ Preview ͕Մೳʹ - Timeline provider - https://developer.apple.com/wwdc23/10252

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Widgets ͷ Preview ͕Մೳʹ - Timeline entries - https://developer.apple.com/wwdc23/10252

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Widgets ͷ Preview ͕Մೳʹ - Live Activities - https://developer.apple.com/wwdc23/10252

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Previews Λදࣔ͢ΔσόΠε͕બ୒Մೳʹ https://developer.apple.com/wwdc23/10252

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Xcode Previews Λ 
 ར༻͢Δࡍͷ Tips

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Xcode Previews Λར༻͢Δࡍͷ Tips • Library targets Ͱ Preview ͢Δํ๏ • Previews Ͱ data ΍ assets Λར༻͢Δํ๏ • ࣮ػͰ͔͠Ͱ͖ͳ͍͜ͱΛ Previews Ͱࢼ͢ํ๏

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Library targets Ͱ Preview ͢Δ • Library targets ‣ Frameworks, Packages, Dynamic libraries • Library targets Λར༻͢Δ໨తྫ ‣ ϚϧνϞδϡʔϧԽ ‣ ϥΠϒϥϦͷ։ൃ • Library targets Ͱ Preview ͢Δʹ͸Ͳ͏͢Ε͹ʁ

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Xcode Previews ͷ࢓૊Έ • ௨ৗɺPreviews Λىಈͯ͠ϨϯμϦϯά͢ΔͨΊʹ͸ App ΍ 
 Widget ͳͲͷExecutable ͕ඞཁ • Previews ͸ Executable Λݟ͚ͭΔͨΊʹҎԼͷ 3 ͭΛ࢖༻͢Δ ‣ Edited source fi les - ࡞ۀ͍ͯ͠ΔιʔεϑΝΠϧ ‣ Target dependencies - ࡞ۀ͍ͯ͠ΔϑΝΠϧΛؚΉ target ͓Αͼ target ͷશͯͷґଘؔ܎ ‣ Selected scheme - બ୒͞Ε͍ͯΔ scheme ͱ Target dependencies Λ૊Έ߹ΘͤΔ

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App target ʹ 1 ͚ͭͩͷϑΝΠϧ͕͋Δ৔߹ https://developer.apple.com/wwdc23/10252

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ผͷ target ͕͋Δ৔߹ https://developer.apple.com/wwdc23/10252

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ผͷ target ͕͋Δ৔߹ https://developer.apple.com/wwdc23/10252

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2 ͭͷϑΝΠϧ͕ผʑͷ package ʹ͋Δ৔߹ https://developer.apple.com/wwdc23/10252

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Executable ͕ݟ͔ͭΒͳ͍৔߹ https://developer.apple.com/wwdc23/10252

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XCPreviewAgent ͕ࣗಈͰ࡞੒͞ΕΔ https://developer.apple.com/wwdc23/10252 • ࣗಈͰ XCPreviewAgent 
 ͱ͍͏ΞϓϦΛ࡞Γɺ 
 library ΛಡΈࠐ΋͏ͱ͢Δ • Previews ͰΫϥογϡͨ࣌͠ 
 ͳͲɺXCPreviewAgent ͱ͍͏ 
 ϓϩηεΛ஌͓ͬͯ͘ͱศར • ໰୊͕ى͖ͨݪҼΛߜΕΔ͔΋

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Library targets Ͱ Previews ΛΑΓշదʹ 
 ಈ࡞ͤ͞ΔͨΊͷํ๏ • Previews ͷ࢓૊ΈΛར༻͢Ε͹ɺ͍͔ͭ͘ͷํ๏Ͱ Previews Λ 
 շదʹಈ࡞ͤ͞ΒΕΔ • ঺հ͞Ε͍ͯͨ 2 ͭͷํ๏ ‣ ίʔυΛ library targets ʹϞδϡʔϧԽͯ͠খ͞ͳ scheme Λ࡞Δ ‣ Preview ઐ༻ͷখ͞ͳΞϓϦ (executable) Λ࡞੒͢Δ - ࡞੒ํ๏ʹ͍ͭͯ͸ηογϣϯͷதͰղઆ͞Ε͍ͯ·͢

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Previews Ͱ assets ͳͲΛར༻͢Δ https://developer.apple.com/wwdc23/10252

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Development Assets Ͱ App Store ༻ͷΞϓϦ 
 ͔ΒPreviews ༻ assets ͳͲΛࣗಈͰ࡟আ͢Δ https://developer.apple.com/wwdc23/10252

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Previews ͰσόΠεݻ༗ͷػೳΛར༻͢Δํ๏ • Previews ͰΧϝϥ΍ηϯαʔɺ৭ʑͳσʔλʹΞΫηε͍ͨ͠ • ͦΜͳ࣌͸ Previews Λ࣮ػͰ࢖͏͜ͱ͕Ͱ͖·͢ ‣ લ͔ΒͰ͖͚ͨͲ Canvas ্ͷ interface ͕ͪΐͬͱมΘ͍ͬͯΔ

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Previews Ͱ࣮ػΛར༻͢Δ https://developer.apple.com/wwdc23/10252

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Ҿ༻ɾࢀߟ • Build programmatic UI with Xcode Previews ‣ https://developer.apple.com/wwdc23/10252 • Xcode 15 Beta Release Notes ‣ https://developer.apple.com/documentation/xcode-release-notes/ xcode-15-release-notes#DeviceDiscoveryUI

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ࣗݾ঺հ • ΞΠΧϫ • Twitter: @kalupas226 • ຊۀ෭ۀͰ৭ʑΞϓϦΛ࡞ͬͨΓج൫੔උͨ͠Γ • The Composable Architecture (TCA) ͕ಘҙͰ͢