「iOSエンジニアだし、Androidアプリも作れるでしょ？」

by akatsuki174

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ʮiOSΤϯδχΞͩ͠ɺ AndroidΞϓϦ΋ ࡞ΕΔͰ͠ΐʁʯ iOSDC Japan 2020 @akatsuki174

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ࣗݾ঺հ

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• ਢ౻ຘʢ@akatsuki174ʣ • iOS→AndroidΤϯδχΞ • גࣜձࣾTimersॴଐ • ࠷ۙiOS΋࢓ࣄͰ΍ͬͯΔ • Α͘࢖ͬͯΔ୺຤͸ɺiPhone Xͱ Pixel 3 • iOSDC Japan 2020 core staff

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ࠓ೔ͷ࿩

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໨࣍ • iOS/AndroidͷUIͰҧ͏ͱ͜Ζ • Swiftͱൺֱͭͭ͠KotlinΛֶ΅͏ • ActivityɺFragmentΛཧղ͠Α͏ • Α͘࢖͏ListViewͱRecyclerViewΛ஌Ζ͏ • ؆୯ͳUI͕૊ΊΔΑ͏ʹͳΖ͏ • ࠷௿ݶͷσόοά͕Ͱ͖ΔΑ͏ʹͳΖ͏

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ͳΜͱͳ͘Ͱ͖ΔΑ͏ʹͳΔ͜ͱ • iOS/Androidͷҧ͍͕Θ͔Δ • Kotlinίʔυ͕ಡΊΔΑ͏ʹͳΔ • AndroidΞϓϦͷ࡞Γํ͕Θ͔Δ • ෆ۩߹ͷಛఆ͕Ͱ͖ΔΑ͏ʹͳΔ

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ࠓ೔ͷࢿྉ

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ࠓ೔ͷࢿྉ • SpeakerDeckʹ্͛ͯ·͢ • TwitterͰྲྀͯ͠·͢

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iOS/AndroidͷUIͰ ҧ͏ͱ͜Ζ

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ࣅͯΔ͚Ͳɺҧ͏ • iOS/AndroidͰࣅͯΔ΋ͷʹ͍ͭͯઆ໌ • ࣅͯͯ΋ࡉ෦͕ҟͳ͍ͬͯͨΓ͢ΔͷͰ҆қ ʹஔ͖׵͑ΒΕͳ͍͜ͱ΋

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ը໘ભҠ • iOS • ϓογϡભҠ͕ج࣠ɻ֊૚Λ۷ΔΠϝʔδɻ • ঢ়گʹΑͬͯɺϞʔμϧભҠ • Android • ϖʔδΛੵΈॏͶΔΠϝʔδɻ

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໭ΔϘλϯͷ༗ແ • iOS • ΄΅ඞ͍͍ͣͭͯΔ • Android • ͍ͭͯͳ͍͜ͱ΋͋Δ • ୺຤ʹ໭ΔϘλϯ͕͋Δ

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J04 "OESPJE

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ը໘λΠτϧͷҐஔ • iOS • தԝ • ϥʔδλΠτϧͩͱࠨ୺ • Android • ࠨ୺

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J04 "OESPJE

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ཁૉબ୒ • iOS • ϦετɺυϥϜϩʔϧɺΞΫγϣϯγʔτ • Android • νΣοΫϘοΫεɺϥδΦϘλϯɺυϩοϓ μ΢ϯϦετɺϘτϜγʔτ

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J04 "OESPJE

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Ϧετͷ໼ҹ • iOS • Disclosure IndicatorΛ෇͚ͨΓ͢Δ • Android • ෇͚ͳ͍ํ͕Ұൠతʁ

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J04 "OESPJE

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೔෇બ୒ • iOS • υϥϜϩʔϧ • iOS 14͔Β͸ΧϨϯμʔܕ΋ • Android • ΧϨϯμʔܕ

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"OESPJE J04

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ϑϩʔςΟϯάΞΫγϣϯϘλϯ • ͦͷը໘ͷओΞΫγϣϯϘλϯ • iOSͰ΋࢖͍ͬͯΔྫ΋ͪΒ΄Β

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γϟυ΢ • ϚςϦΞϧσβΠϯʹӨͷষ͕͋Δ • Z࣠ɺಈ͖ͷํ޲Λ஌֮ͤ͞Δ • Өͷೱ͞͸ߴ͞ɺଞͱͷؔ܎ʹΑܾͬͯ·Δ

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https://material.io/design/environment/light-shadows.html#shadows ᶃ ᶄ ᶅ

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φϏήʔγϣϯυϩϫʔ • iOS • كʹͦΕͬΆ͍ͷ͕͋Δ • Android • ը໘ࠨ͔ΒεϥΠυͯ͠දࣔͰ͖Δϝχϡʔ

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ࢀߟʹͳΔαΠτ • consim • iOS/Androidͷը໘ΛൺֱͰ͖ΔαΠτ • https://consim.design/ • ʮAndroid͸iOSͱಉ͡σβΠϯͰʂʯͱݴΘΕͨͱ͖ͷ ରԠҊ • https://qiita.com/ogapants/items/ 8a551ed3b16bcf0cc3ed

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Swiftͱൺֱͭͭ͠ KotlinΛֶ΅͏

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Kotlinͱ͸ • JetBrains͕։ൃͨ͠ΦϒδΣΫτࢦ޲ɹɹɹ ϓϩάϥϛϯάݴޠ • Google I/O 2017ͰAndroidνʔϜ͕KotlinΛ ެࣜʹαϙʔτ͢Δ͜ͱΛൃද • Javaͷࢿ࢈ͷଟ͘Λྲྀ༻Ͱ͖Δ • 1ͭͷϓϩδΣΫτʹJavaͱKotlinͷࠞࡏՄ

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KotlinͱSwift • ΘΓͱॻ͖ํ͕ࣅͯΔ • جຊจ๏Ͱࣅ͍ͯΔ΋ͷΛ঺հ

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ϓϩύςΟએݴ

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Φϓγϣφϧ

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Ξϯϥοϓ

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ؔ਺

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഑ྻૢ࡞

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Ϋϥε֦ு

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ΠϯλʔϑΣʔεɺϓϩτίϧ

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ͦͷଞ

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ActivityɺFragmentΛ ཧղ͠Α͏

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ActivityͱFragment • MVCͰݴ͏ͱ͜ΖͷControllerΈ͍ͨͳ΋ͷ • ϥΠϑαΠΫϧΛ͍࣋ͬͯΔ

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Activityͱ͸ • ௨ৗɺ1ͭͷActivityͰ1ͭͷը໘Λ࣮૷͢Δ • ≒ UIViewController

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https://developer.android.com/guide/components/ activities/activity-lifecycle?hl=ja

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"DUJWJUZ ੜ੒࣌ "DUJWJUZ͔Β཭ΕΑ ͏ͱ͍ͯ͠ΔɻӬଓԽॲཧ ͸͜͜Ͱɻ Ϣʔβ͕ΠϯλϥΫ γϣϯΛ࣮ࢪͰ͖Δঢ়ଶ "DUJWJUZ͕ ݟ͑ͳ͘ͳͬͨͱ͖ https://developer.android.com/guide/components/ activities/activity-lifecycle?hl=ja

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ActivityͷϨΠΞ΢τ • Activity#onCreate(Bundle)ͷதͰ Activity#setContentView(int)Λݺͼग़͢ • int͸ϨΠΞ΢τϑΝΠϧͷid

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Fragmentͱ͸ • Activityʹ૊ΈࠐΜͰ࢖͏ • 1ͭͷActivityʹෳ਺ͷFragmentΛ૊Έ߹Θͤɹ ΒΕΔ • ଟղ૾౓ରԠ࣌ʹศར • ෳ਺ͷActivityͰFragmentΛ࠶ར༻Ͱ͖Δ

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https://developer.android.com/guide/ components/fragments?hl=ja#Creating

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https://developer.android.com/guide/ components/fragments?hl=ja#Creating 'SBHNFOU͕ "DUJWJUZʹ ૊Έࠐ·Εͨঢ়ଶ 'SBHNFOU ͕࣋ͭ 7JFXΛߏங 'SBHNFOU ͕"DUJWJUZ͔Β ੾Γ཭͞ΕΔ

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https://developer.android.com/guide/components/fragments?hl=ja#Design

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Α͘࢖͏ListViewͱ RecyclerViewΛ஌Ζ͏

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ListViewͱ͸ • Androidͷॳظ͔Β༻ҙ͞Ε͍ͯΔΫϥε • γϯϓϧͳҰཡදࣔ

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ొ৔ਓ෺ͷΠϝʔδ %BUB4PVSDF "EBQUFS -JTU7JFX $VSTPS "SSBZ-JTU FUD

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ListViewʢ࣮૷ʣ

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ListViewʢϨΠΞ΢τʣ

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RecyclerViewͱ͸ • ListViewΛ֦ுͯ͠ॊೈੑΛ΋ͨͤͨվྑ൛ • εϫΠϓɺD&DͳͲΛ͢ΔͳΒͬͪ͜ • ϔομʔɺϑολʔͷ࢓૊Έ͸ଘࡏ͠ͳ͍ • ۠੾Γઢ͸ࣗ෼Ͱ࣮૷͢Δඞཁ͕͋Δ

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ొ৔ਓ෺ͷΠϝʔδ %BUB4PVSDF "EBQUFS 7JFX)PMEFS 3FDZDMFS7JFX -BZPVU.BOBHFS

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RecyclerViewʢຊମʣ

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RecyclerViewʢAdapterʣ

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RecyclerViewʢViewHolderʣ

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RecyclerViewʢϨΠΞ΢τʣ

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RecyclerViewʢϨΠΞ΢τʣ

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؆୯ͳUI͕ ૊ΊΔΑ͏ʹͳΖ͏

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AndroidͷϨΠΞ΢τͷ࡞Γํ • xmlͰ௚઀هड़ɺ΋͘͠͸GUIͰ࡞੒ ʢStoryboard, xibΈ͍ͨͳ͔Μ͡ʣ • ͍ͣΕʹͯ͠΋xml͕ੜ੒͞ΕΔ

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LayoutsͱWidgets • LayoutͰ࿮Λࢦఆ͠ɺ෦඼ͱͳΔWidgetΛɹ ฒ΂͍ͯ͘ • Widgetʹ͸Button, ImageView, TextView, ListViewͳͲ͕͋Δ

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-BZPVU 8JEHFU -BZPVU

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͞·͟·ͳϓϩύςΟ • LayoutɺWidget͸iOSͱಉ͡Α͏ʹɺ༷ʑͳɹ ઃఆΛՃ͑Δ͜ͱ͕Ͱ͖Δ • ΋ͪΖΜLayout/WidgetʹΑͬͯઃఆͰ͖Δɹ ϓϩύςΟ͸ҟͳΔ • ͜͜Ͱ͸୅දతͳ΋ͷΛ঺հ

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id • ݴ༿௨Γɺࣝผࢠ • ಉҰϑΝΠϧ಺ͰҰҙͳ໊લʹͳ͍ͬͯΕ͹ɹ ྑ͍ • xmlͰৼͬͨidΛݩʹKotlinϑΝΠϧ͔Βݺͼɹ ग़͕͠Ͱ͖Δ

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width/height • ݴ༿௨Γɺ෯ͱߴ͞ • `match_parent`ͩͱ਌ͷViewʹର͍ͯͬ͠ͺ͍ ʹ޿͕Δ • `wrap_content`͸಺༰ʹ߹Θͤͯௐઅ͞ΕΔ • ΋ͪΖΜઈର஋ࢦఆ΋Մ

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ओͳLayoutͷछྨ • LinearLayout • ॎorԣ1ྻʹཁૉΛฒ΂Δ • UIStackViewͬΆ͍͔Μ͡ • ConstraintLayout • ཁૉʹ੍໿Λ෇͚ɺҐஔΛ૬ରతʹܾΊΔ

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͓·͚ɿϓϨϏϡʔTips

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༨ஊɿJetpack Compose • Google I/O 2019Ͱൃද͞ΕͨɺUIπʔϧΩοτ • SwiftUIͷΑ͏ʹɺએݴతʹUIΛߏஙͰ͖Δ

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https://developer.android.com/jetpack/compose?hl=ja

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࠷௿ݶͷσόοά͕ Ͱ͖ΔΑ͏ʹͳΖ͏

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2௨Γ঺հ • ϒϨʔΫϙΠϯτΛுΔํ๏ • Ϗϡʔ֊૚Λ೺Ѳ͢Δํ๏

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ϒϨʔΫϙΠϯτͷுΓํ

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͜Μͳέʔε͋Γ·ͤΜ͔ʁ • RecyclerViewͷpositionͳͲɺมΘΓΏ͘஋Λ ೺Ѳ͍ͨ͠ • ͍͍ͪͪϒϨʔΫϙΠϯτͰࢭ·ͬͯ΄͘͠ɹ ͳ͍ • ίʔυʹLog.dॻ͍ͯ࠶Ϗϧυ͢Δͷ΋໘౗

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ղܾͰ͖·͢ • Evaluate and logΛ׆༻͢Ε͹࠶Ϗϧυͤͣɹ ϩάΛग़ྗͰ͖Δ • ίʔυ΋͍͡Δඞཁ͕ͳ͍

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Ϗϡʔ֊૚ͷݟํ • Layout InspectorΛ࢖͏

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·ͱΊ

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·ͱΊ • iOSͷੈքΛ஌͍ͬͯΕ͹Android΋ͦ͜·Ͱɹ ೉͘͠ͳ͍ʂʂʂ

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એ఻

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• αʔόʔαΠυΤϯδχΞ (PHP, Golang, AWS) • AndroidΤϯδχΞ (Kotlin) • iOSΤϯδχΞ (Swift) TimersͰ͸ݱࡏΤϯδχΞશ৬छ࠾༻தʂ ৄ͘͠͸”Timers”Ͱݕࡧ

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͝ਗ਼ௌ ͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ