Xcode 16のPreviewModifierと@Previewableを活用した効率的なプレビュー方法の考察

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1. potatotips #88 iOS/Android։ൃTipsڞ༗ձ 2024/07/05 @STORES Xcode 16ͷPreviewModifierͱ@Previewable Λ׆༻ͨ͠ޮ཰తͳϓϨϏϡʔํ๏ͷߟ࡯ ojun - DeNA Co., Ltd.
2. ࣗݾ঺հʢojunʣ • name: ojun • 2023೥৽ଔೖࣾ • iOSΤϯδχΞ @ojun_9
3. Xcode 16ͷ PreviewModifier ͱ @Previewable Λ׆༻ͨ͠ޮ཰తͳϓϨϏϡʔํ๏ͷߟ࡯
4. PreviewModifier ͱ ˏPreviewable ʹ͍ͭͯ
5. @Previewable ʹ͍ͭͯ @Previewable ͸ Xcode 16 Ͱ௥Ճ͞ΕͨϚΫϩ ϓϩύςΟʔϥούʔʹରͯ͠దԠ͢Δ͜ͱ͕Ͱ͖Δ #Previewͷ಺෦Ͱ௚઀࢖༻Մೳ iOS ʹؔͯ͠͸ iOS 18 Ҏ্Ͱಈ࡞͢Δ
7. PreviewModifierʹ͍ͭͯ PreviewModi fi er ͸ Xcode 16 Ͱ௥Ճ͞Εͨprotocol iOS ʹؔͯ͠͸ iOS 18 Ҏ্Ͱಈ࡞͢Δ
16. Context Context
17. Context Context View
18. Context Context View
19. Context Context View
21. ͜ͷ2ͭͷػೳΛݟͨ࣌ʹͲ͏ࢥ͍·ͨ͠ ͔ʁ
22. ͜ͷ2ͭͷػೳΛݟͨ࣌ʹͲ͏ࢥ͍·͔ͨ͠ʁ ݸਓతʹ͸͜ΕΒͷػೳΛ࠷ॳʹݟͨ࣌͸ʮѻ͏ͷ͕େ෼೉ͦ͠͏ʯͱࢥͬͨ
23. ͜ͷ2ͭͷػೳΛݟͨ࣌ʹͲ͏ࢥ͍·͔ͨ͠ʁ ݸਓతʹ͸͜ΕΒͷػೳΛ࠷ॳʹݟͨ࣌͸ʮѻ͏ͷ͕େ෼೉ͦ͠͏ʯͱࢥͬͨ
24. ͜ͷ2ͭͷػೳΛݟͨ࣌ʹͲ͏ࢥ͍·͔ͨ͠ʁ ݸਓతʹ͸͜ΕΒͷػೳΛ࠷ॳʹݟͨ࣌͸ʮѻ͏ͷ͕େ෼೉ͦ͠͏ʯͱࢥͬͨ
25. ͜ͷ2ͭͷػೳΛݟͨ࣌ʹͲ͏ࢥ͍·͔ͨ͠ʁ makeSharedContext() ͷ࢖͍ํ͕؊ʹͳΔ mockαʔόͱ௨৴͢Δʁ → PreviewͰͦ͜·Ͱ͢Δͷ͔ʁ ݸਓతʹ͸͜ΕΒͷػೳΛ࠷ॳʹݟͨ࣌͸ʮѻ͏ͷ͕େ෼೉ͦ͠͏ʯͱࢥͬͨ
26. PreviewModifier ͱ @PreviewableΛ׆ ༻ͨ͠ޮ཰తͳϓϨϏϡʔํ๏ͷߟ࡯
27. લఏͱͳΔViewͷ࡞੒ SNSͷλΠϜϥΠϯΛߟ͑Δ
28. લఏͱͳΔViewͷ࡞੒ SNSͷλΠϜϥΠϯΛߟ͑Δ ౤ߘΛද͢ߏ଄ମΛఆٛ
29. લఏͱͳΔViewͷ࡞੒ SNSͷλΠϜϥΠϯΛߟ͑Δ ViewΛఆٛ [Post] Λ࣋ͪ body Ͱར༻
30. લఏͱͳΔViewͷ࡞੒
31. લఏͱͳΔViewͷ࡞੒
32. લఏͱͳΔViewͷ࡞੒ PreviewͰ΋ͬͱද͍ࣔͤͨ͞ʂ
33. લఏͱͳΔViewͷ࡞੒
34. લఏͱͳΔViewͷ࡞੒
35. લఏͱͳΔViewͷ࡞੒
36. લఏͱͳΔViewͷ࡞੒ ಡΈࠐΈ࣌ͷ Placeholder େৎ෉͔ͳʁ ໊લ௕͘ͳͬͨ࣌େৎ෉͔ͳʁ վߦ͞ΕͨΒେৎ෉͔ͳʁӳޠɾֆจࣈͷ࣌ େৎ෉͔ͳ ͍͍Ͷͷ਺͕ଟ͍࣌େৎ෉͔ͳ 0݅ͷ࣌ඇදࣔʹͳΔ͔ͳʁ
37. લఏͱͳΔViewͷ࡞੒ ඞཁͳύλʔϯͷ Post Λ௥Ճ͢Ε͹ ෳ਺ύλʔϯͷ Preview ͸Մೳ ͔͠͠ӈਤͷΑ͏ʹ͔ͳΓݟͮΒ͘ͳΔ
38. લఏͱͳΔViewͷ࡞੒ ඞཁͳύλʔϯͷ Post Λ௥Ճ͢Ε͹ ෳ਺ύλʔϯͷ Preview ͸Մೳ ͔͠͠ӈਤͷΑ͏ʹ͔ͳΓݟͮΒ͘ͳΔ @Previewable ΍ PreviewModi fi er Λར༻͠ ղܾ͢Δ
39. @Previewable ΍ PreviewModifier Λར༻͠ղܾ͢Δ
40. @Previewable ΍ PreviewModifier Λར༻͠ղܾ͢Δ 1. JSONϑΝΠϧΛ࡞੒͠ɺඞཁͳσʔλΛ௥Ճ͢Δ
41. @Previewable ΍ PreviewModifier Λར༻͠ղܾ͢Δ 1. JSONϑΝΠϧΛ࡞੒͠ɺඞཁͳσʔλΛ௥Ճ͢Δ 1. ʢࠓճ͸ ChatGPT Λར༻ͯ͠࡞੒ʣ
42. @Previewable ΍ PreviewModifier Λར༻͠ղܾ͢Δ 1. JSONϑΝΠϧΛ࡞੒͠ɺඞཁͳσʔλΛ௥Ճ͢Δ 1. ʢࠓճ͸ ChatGPT Λར༻ͯ͠࡞੒ʣ 2. ʢ࡞੒͠௥Ճ͢Δ͚ͩͳͷͰׂѪʣ
43. @Previewable ΍ PreviewModifier Λར༻͠ղܾ͢Δ 1. JSONϑΝΠϧΛ࡞੒͠ɺඞཁͳσʔλΛ௥Ճ͢Δ 1. ʢࠓճ͸ ChatGPT Λར༻ͯ͠࡞੒ʣ 2. ʢ࡞੒͠௥Ճ͢Δ͚ͩͳͷͰׂѪʣ 2. JSONϑΝΠϧΛಡΈࠐΈ decode ͠ Preview ʹ஫ೖ
44. @Previewable ΍ PreviewModifier Λར༻͠ղܾ͢Δ let posts: [Post] ͕ @Environment Ͱͳ͍৔߹͸ @Previewable Λར༻͢Δͱྑͦ͞͏
45. @Previewable ΍ PreviewModifier Λར༻͠ղܾ͢Δ
46. @Previewable ΍ PreviewModifier Λར༻͠ղܾ͢Δ .task {} ΋͘͠͸ .onAppear {} Λ ར༻ͦ͠ͷதͰಡΈࠐΈΛߦ͏
47. @Previewable ΍ PreviewModifier Λར༻͠ղܾ͢Δ .task {} ΋͘͠͸ .onAppear {} Λ ར༻ͦ͠ͷதͰಡΈࠐΈΛߦ͏ decode ͕੒ޭͨ͠Βɺposts ʹ୅ೖ ͢Δ
48. .task {} ΋͘͠͸ .onAppear {} Λ ར༻ͦ͠ͷதͰಡΈࠐΈΛߦ͏ decode ͕੒ޭͨ͠Βɺposts ʹ୅ೖ ͢Δ ෳ਺ͷύλʔϯͰ Preview ͕Մೳʹͳͬͨ 🎉
49. @Previewable ΍ PreviewModifier Λར༻͠ղܾ͢Δ let posts: [Post] ͕ @Environment Ͱ͋Δ৔߹͸ PreviewModi fi er Λར༻͢Δͱྑͦ͞͏
50. @Previewable ΍ PreviewModifier Λར༻͠ղܾ͢Δ
53. ·ͱΊ
54. ·ͱΊ Xcode 16͔ΒPreviewModi fi er ͱ @Previewable ͕௥Ճ͞Εͨ ͜ΕΒΛར༻͢Δ͜ͱͰ Preview ͷମݧ͕ΑΓ޲্͢Δ JSONϑΝΠϧΛར༻͠ΤϯςΟςΟΛ஫ೖ͢Δ͜ͱͰগ͠ͷίʔυͰଟྔͷύλʔϯΛ Preview Ͱ֬ೝ͢Δ͜ͱ͕Մೳ
55. ͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ