React Nativeで作る色々なジェスチャー

by Yosuke Saito

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@saitoxu React NativeͰ࡞Δ ৭ʑͳδΣενϟʔ

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ࣗݾ঺հ • @saitoxu ʢ͍͞ͱ͏ʣ • Co-Founder&CTO@Carat Inc. • 2ظ໨ʹೖͬͨ͹͔ΓͷελʔτΞο ϓ • React, React Native, Rails, Python… • ωΠςΟϒ͸झຯͰ͔͠ॻ͍ͨ͜ͱͳ ͍Ϛϯ

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αʔϏε঺հ • ٻ৬ɾస৬ΞϓϦGLITʢάϦοτʣ • TinderϥΠΫͳUI͕ಛ௃ • https://glit.io • React Native੡ • ͕ͩݱࡏiOS൛ͷΈ.. • JSΤϯδχΞઈࢍืूͯ͠·͢..ʂ

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ΞϓϦͰΑ͘࢖͏ δΣενϟʔ

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1. λοϓ 2. ௕ԡ͠ 3. μϒϧλοϓ 4. υϥοά 5. εϫΠϓ 6. ϐϯνΠϯˍϐϯνΞ΢τ

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React NativeͰ Ͳ͏࡞Δ͔ʁ

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1. λοϓ • Touchable*ίϯϙʔωϯτΛ࢖༻

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2. ௕ԡ͠ • Touchable*ίϯϙʔωϯτͷonLongPressͱ͍͏props Λ࢖༻

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3. μϒϧλοϓ • Touchable*ͷonPressൃՐͷִ͕ؒx msҎ಺ͩͬͨΒμϒϧλοϓͱΈͳ͢

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3. μϒϧλοϓ • Touchable*ͷonPressൃՐͷִ͕ؒx msҎ಺ͩͬͨΒμϒϧλοϓͱΈͳ͢

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4. υϥοά • δΣενϟʔΛѻ͏PanResponderΛ࢖༻ • evt΍gestureStateΛհͯ͠Componentͷ࠲ඪ΍ҠಈྔͳͲ͕औಘͰ͖Δ

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No content

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pan.x pan.y (1) ॳظԽ

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offset x + 0 offset y + 0 (2) υϥοά։࢝࣌

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offset x offset y dx dy (3) υϥοάத

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pan.x pan.y (4) ཭ͨ͠ޙ

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5. εϫΠϓ • υϥοάͱ͋·ΓมΘΒͳ͍ • ᮢ஋ͷઃఆͱΞχϝʔγϣϯ͕ඞཁ υϥοάͯ͠ᮢ஋Λ௒͑Δ ΞχϝʔγϣϯͰඈΜͰ͘

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dx threshold decay

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6. ϐϯνΠϯˍϐϯνΞ΢τ • gestureState.numberActiveTouches: ༗ޮͳ λονͷ਺ • evt.nativeEvent.touches: λονΠϕϯτͷΦ ϒδΣΫτɻλον͞Εͨ৔ॴͷ࠲ඪͳͲ͕ೖͬ ͍ͯΔ

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distance

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distance

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͓ΘΓʹ • جຊతͳδΣενϟʔͷ࣮૷Λ঺հ͠·ͨ͠ • ͜ΕΒͷδΣενϟʔ΍AnimationͳͲΛ͞Β ʹ૊Έ߹ΘͤɺωΠςΟϒͬΆ͍͍͍ײ͡ͷ UI/UXΛ࡞͍͖ͬͯ·͠ΐ͏

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Thanks!!