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ReactiveCocoa Pitfalls at freee
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Kenichi Yonekawa
October 18, 2014
Programming
2
850
ReactiveCocoa Pitfalls at freee
10/18にfreeeで開催されたReactiveCocoa TokyoのLT資料です
http://connpass.com/event/8680/
http://www.freee.co.jp/
Kenichi Yonekawa
October 18, 2014
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Transcript
ReactiveCocoa Pitfalls at freee @yonekawa
freeeͷiOSΞϓϦ͕ ReactiveCocoaΛಋೖ͔ͯ͠ Β̕ϲ݄͕ܦͪ·ͨ͠
• 2014/12/20 iOSΞϓϦ։ൃணख • 2014/01/10 ReactiveCocoaಋೖ • 2014/02/14 1.0.0ϦϦʔε
ʹҰମԿ͕ɾɾɾ
ReactiveCocoaΛ͍ͬͯͯ freeeͰى͖ͨ ϋϚΓͲ͜ΖΛհ͠·͢ : ReactiveCocoaͷAPI͕ͪΐ͍ͪΐ͍ग़͖ͯ·͢
combineLatestWith
combineLatestWithͱSignalͷ࣮ߦॱ • combineLatestWithฒྻʹSignalΛ࣮ߦ͢Δ ͷͰൃՐ͞ΕΔॱংෆఆɻϩάΠϯ͔ͯ͠Βσʔ λΛऔಘɺΈ͍ͨͳॲཧʹ͏ͱϋϚΔ • ྻʹ͍ͨ࣌͠ʹflattenMapΛ͏
rac_textSignal
rac_textSignal vs RACObserve • textϓϩύςΟʹೖ͢ΔΑ͏ͳέʔεͰγ άφϧ͕ൃՐ͠ͳ͍ɻRACObserveͰtextϓϩύ ςΟΛsubscribe͢ΔͱൃՐ͢Δ • ٯʹΩʔϘʔυ͔ΒͷೖྗRACObserveͩͱൃՐ ͠ͳ͍ɻrac_textSignalͰऔΒͳ͍ͱ͍͚ͳ͍
• combineLatestͯ྆͠ํൃՐ͢ΔsignalΛ࡞ͬ ͨΓͨ͠
sendCompleted
None
sendErrorͷޙͷsendCompleted • sendErrorͷޙʹsendCompletedΛݺΜͰݺ Εͳ͍ɻ • subscribe͢ΔଆͰnextͱerrorͰڞ௨ͰΓͨ ͍ॲཧʢΠϯδέʔλΛࢭΊΔͱ͔ʣΛॻ͖͍ͨ࣌ ʹݸผʹॻ͔ͳ͍ͱ͍͚ͳ͍
[RACSignal empty]
None
[RACSignal empty] • RACSignalϕʔεͰΓऔΓ͍ͯ͠Δ࣌ɺ [RACSignal empty]Λฦ͢ͱવnexterrorൃ Ր͞Εͳ͍ • subscribeલʹΠϯδέʔλΛճͯ͠nextͱerrorͰ ࢭΊ͍ͯΔ߹ɺΠϯδέʔλ͕ճΓͬͺͳ͠ʹͳΔ
• empty͡Όͳۭͯ͘ͷ݁ՌΛฦ͢SignalΛฦ͢ͷ͕Α ͦ͞͏
UITableView
Cellͷதʹsubscribe͍ͨ͠View͕͋Δ࣌ • ηϧ͕࠶ར༻͞ΕΔͱೋॏʹϑΥʔ ϜͷΠϕϯτΛsubscribeͯ͠ ͠·͏ • reloadͳͲߟ͑Δͱ subscriberΛഁغ͢ΔλΠϛϯ ά͕͍͠ •
ݱঢ়ۤͷࡦͰ࠶ར༻ΊͨΓ ͯ͠Δ
ReactiveCocoa3.0
ReactiveCocoa3.0 • LTͷͨΊʹແͯ͠ಋೖ͠Α͏ͱௐͨ • طଘͷRACSignalϕʔεͷΠϯλϑΣʔεΛ asColdSignalͱ͔Ͱ͖Δͷָͦ͏ͩͬͨ • υΩϡϝϯτແ͠Ͱ͍ํΛ୳Δͷ͍͠