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potatotips #88 iOS/Android։ൃTipsڞ༗ձ 2024/07/05 @STORES Xcode 16ͷPreviewModifierͱ@Previewable Λ׆༻ͨ͠ޮతͳϓϨϏϡʔํ๏ͷߟ ojun - DeNA Co., Ltd.
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ࣗݾհʢojunʣ • name: ojun • 2023৽ଔೖࣾ • iOSΤϯδχΞ @ojun_9
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Xcode 16ͷ PreviewModifier ͱ @Previewable Λ׆༻ͨ͠ޮతͳϓϨϏϡʔํ๏ͷߟ
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PreviewModifier ͱ ˏPreviewable ʹ͍ͭͯ
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@Previewable ʹ͍ͭͯ @Previewable Xcode 16 ͰՃ͞ΕͨϚΫϩ ϓϩύςΟʔϥούʔʹରͯ͠దԠ͢Δ͜ͱ͕Ͱ͖Δ #Previewͷ෦Ͱ༻Մೳ iOS ʹؔͯ͠ iOS 18 Ҏ্Ͱಈ࡞͢Δ
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PreviewModifierʹ͍ͭͯ PreviewModi fi er Xcode 16 ͰՃ͞Εͨprotocol iOS ʹؔͯ͠ iOS 18 Ҏ্Ͱಈ࡞͢Δ
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Context Context
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Context Context View
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Context Context View
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Context Context View
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͜ͷ2ͭͷػೳΛݟͨ࣌ʹͲ͏ࢥ͍·ͨ͠ ͔ʁ
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͜ͷ2ͭͷػೳΛݟͨ࣌ʹͲ͏ࢥ͍·͔ͨ͠ʁ ݸਓతʹ͜ΕΒͷػೳΛ࠷ॳʹݟͨ࣌ʮѻ͏ͷ͕େͦ͠͏ʯͱࢥͬͨ
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͜ͷ2ͭͷػೳΛݟͨ࣌ʹͲ͏ࢥ͍·͔ͨ͠ʁ ݸਓతʹ͜ΕΒͷػೳΛ࠷ॳʹݟͨ࣌ʮѻ͏ͷ͕େͦ͠͏ʯͱࢥͬͨ
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͜ͷ2ͭͷػೳΛݟͨ࣌ʹͲ͏ࢥ͍·͔ͨ͠ʁ ݸਓతʹ͜ΕΒͷػೳΛ࠷ॳʹݟͨ࣌ʮѻ͏ͷ͕େͦ͠͏ʯͱࢥͬͨ
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͜ͷ2ͭͷػೳΛݟͨ࣌ʹͲ͏ࢥ͍·͔ͨ͠ʁ makeSharedContext() ͷ͍ํ͕؊ʹͳΔ mockαʔόͱ௨৴͢Δʁ → PreviewͰͦ͜·Ͱ͢Δͷ͔ʁ ݸਓతʹ͜ΕΒͷػೳΛ࠷ॳʹݟͨ࣌ʮѻ͏ͷ͕େͦ͠͏ʯͱࢥͬͨ
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PreviewModifier ͱ @PreviewableΛ׆ ༻ͨ͠ޮతͳϓϨϏϡʔํ๏ͷߟ
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લఏͱͳΔViewͷ࡞ SNSͷλΠϜϥΠϯΛߟ͑Δ
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લఏͱͳΔViewͷ࡞ SNSͷλΠϜϥΠϯΛߟ͑Δ ߘΛද͢ߏମΛఆٛ
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લఏͱͳΔViewͷ࡞ SNSͷλΠϜϥΠϯΛߟ͑Δ ViewΛఆٛ [Post] Λ࣋ͪ body Ͱར༻
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લఏͱͳΔViewͷ࡞
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લఏͱͳΔViewͷ࡞
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લఏͱͳΔViewͷ࡞ PreviewͰͬͱද͍ࣔͤͨ͞ʂ
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લఏͱͳΔViewͷ࡞
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લఏͱͳΔViewͷ࡞
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લఏͱͳΔViewͷ࡞
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લఏͱͳΔViewͷ࡞ ಡΈࠐΈ࣌ͷ Placeholder େৎ͔ͳʁ ໊લ͘ͳͬͨ࣌େৎ͔ͳʁ վߦ͞ΕͨΒେৎ͔ͳʁӳޠɾֆจࣈͷ࣌ େৎ͔ͳ ͍͍Ͷͷ͕ଟ͍࣌େৎ͔ͳ 0݅ͷ࣌ඇදࣔʹͳΔ͔ͳʁ
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લఏͱͳΔViewͷ࡞ ඞཁͳύλʔϯͷ Post ΛՃ͢Ε ෳύλʔϯͷ Preview Մೳ ͔͠͠ӈਤͷΑ͏ʹ͔ͳΓݟͮΒ͘ͳΔ
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લఏͱͳΔViewͷ࡞ ඞཁͳύλʔϯͷ Post ΛՃ͢Ε ෳύλʔϯͷ Preview Մೳ ͔͠͠ӈਤͷΑ͏ʹ͔ͳΓݟͮΒ͘ͳΔ @Previewable PreviewModi fi er Λར༻͠ ղܾ͢Δ
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@Previewable PreviewModifier Λར༻͠ղܾ͢Δ
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@Previewable PreviewModifier Λར༻͠ղܾ͢Δ 1. JSONϑΝΠϧΛ࡞͠ɺඞཁͳσʔλΛՃ͢Δ
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@Previewable PreviewModifier Λར༻͠ղܾ͢Δ 1. JSONϑΝΠϧΛ࡞͠ɺඞཁͳσʔλΛՃ͢Δ 1. ʢࠓճ ChatGPT Λར༻ͯ͠࡞ʣ
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@Previewable PreviewModifier Λར༻͠ղܾ͢Δ 1. JSONϑΝΠϧΛ࡞͠ɺඞཁͳσʔλΛՃ͢Δ 1. ʢࠓճ ChatGPT Λར༻ͯ͠࡞ʣ 2. ʢ࡞͠Ճ͢Δ͚ͩͳͷͰׂѪʣ
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@Previewable PreviewModifier Λར༻͠ղܾ͢Δ 1. JSONϑΝΠϧΛ࡞͠ɺඞཁͳσʔλΛՃ͢Δ 1. ʢࠓճ ChatGPT Λར༻ͯ͠࡞ʣ 2. ʢ࡞͠Ճ͢Δ͚ͩͳͷͰׂѪʣ 2. JSONϑΝΠϧΛಡΈࠐΈ decode ͠ Preview ʹೖ
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@Previewable PreviewModifier Λར༻͠ղܾ͢Δ let posts: [Post] ͕ @Environment Ͱͳ͍߹ @Previewable Λར༻͢Δͱྑͦ͞͏
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@Previewable PreviewModifier Λར༻͠ղܾ͢Δ
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@Previewable PreviewModifier Λར༻͠ղܾ͢Δ .task {} ͘͠ .onAppear {} Λ ར༻ͦ͠ͷதͰಡΈࠐΈΛߦ͏
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@Previewable PreviewModifier Λར༻͠ղܾ͢Δ .task {} ͘͠ .onAppear {} Λ ར༻ͦ͠ͷதͰಡΈࠐΈΛߦ͏ decode ͕ޭͨ͠Βɺposts ʹೖ ͢Δ
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.task {} ͘͠ .onAppear {} Λ ར༻ͦ͠ͷதͰಡΈࠐΈΛߦ͏ decode ͕ޭͨ͠Βɺposts ʹೖ ͢Δ ෳͷύλʔϯͰ Preview ͕Մೳʹͳͬͨ 🎉
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@Previewable PreviewModifier Λར༻͠ղܾ͢Δ let posts: [Post] ͕ @Environment Ͱ͋Δ߹ PreviewModi fi er Λར༻͢Δͱྑͦ͞͏
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@Previewable PreviewModifier Λར༻͠ղܾ͢Δ
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·ͱΊ
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·ͱΊ Xcode 16͔ΒPreviewModi fi er ͱ @Previewable ͕Ճ͞Εͨ ͜ΕΒΛར༻͢Δ͜ͱͰ Preview ͷମݧ͕ΑΓ্͢Δ JSONϑΝΠϧΛར༻͠ΤϯςΟςΟΛೖ͢Δ͜ͱͰগ͠ͷίʔυͰଟྔͷύλʔϯΛ Preview Ͱ֬ೝ͢Δ͜ͱ͕Մೳ
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͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ