Advanced guard of DeallocationChecker

by r-plus

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"EWBODFEHVBSEPG DeallocationChecker 11/11 potatotips #66 taiki komaba(@r_plus)

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UBJLJLPNBCB !S@QMVT

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DeallocationChecker HJUIVCDPNGBTUSFE%FBMMPDBUJPO$IFDLFS EJTQBUDIBGUFSͯ͠TFMG͕ੜ͖࢒͍ͬͯΔ͔ʢϦʔ Ϋ͍ͯ͠Δ͔ʣνΣοΫͯ͠4*("#35౤͛ͯ͘ΕΔϝιουΛఏ ڙͯ͘͠ΕΔ viewDidDisappear(_:)࣌ʹͦΕΛ࣮ߦ͢ΔͱϦʔΫνΣοΫग़དྷΔ

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DeallocationChecker viewDidDisappear(_:)࣌ʹͦΕΛ࣮ߦ͢ΔͱϦʔΫνΣοΫग़དྷΔ ˠνΣοΫ͍ͨ͠WJFXDPOUSPMMFSຖʹݸผʹ࣮ߦ͢Δඞཁ͕͋Δ

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ΊΜͲ͍

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ࣗಈνΣοΫ΁ J04%$ͷ!DPSJO͞Μͷૉ੖Β͍͠-5ʮ໌೔͔Β࢖͑Δ 7JFX$POUSPMMFSͷ.FNPSZ-FBLݕग़ʯΛࢀর IUUQTTQFBLFSEFDLDPNDPSJOJPTEDNFNPSZMFBL ʮviewDidDisappear(_:)Λ.FUIPE4XJ[[MJOHͯ͠શͯͷWJFXDPOUSPMMFSΛࣗ ಈͰ%FBMMPDBUJPO$IFDLFSͷνΣοΫର৅ʹ͠Α͏ʂʯͱ͍͏࿩

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White list view controllers Ͱ΋ɺେମ͍͔ͭ͘ྫ֎తͳWJFXDPOUSPMMFS͕ग़ͯ͘Δ ্λϒతͳ΍ͭͷWJFXDPOUSPMMFSͱ͔ Α͘Θ͔ΒΜ4ZTUFN͕࢖ͬͯΔͬΆ͍6*,JUͷ΋ͷͱ͔

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White list view controllers ˣͷ༷ʹνΣοΫલʹHVBSEΛೖΕΔ͜ͱʹͳΔ

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ର৅͕૿͑Δ౓ λϒ͕૿͑Δ౓ ʹϝϯς͢Δͷ͕ΊΜͲ͍ ʢ௥Ճ͢Δͷ͕ɺͱ͍͏ΑΓ͸ͦΕΛઆ໌ͨ͠Γ ஌Βͳͯͭ͘·ͬͯ͠·͍ແବͳ࣌ؒΛ࢖Θͤͯ͠·ͬͨΓ͢Δࣄ͕ɻʣ

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White list view controllers ͜ͷ΁ΜͷHVBSE XIJUFMJTU Λ͏·͍ࣄ΍Γ͍ͨ ΋ͷʹΑͬͯ͸QSPUPDPM࢖͏ํ๏΋͋Δ͚Ͳࠓճ͸ผख๏

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"EWBODFEHVBSEPG DeallocationChecker

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Pattern of white list λϒత7$ͷ࣮૷͸λϒ੾ସͯ͠΋࠶࡞੒͠ͳͯ͘ྑ͍༷ʹอ༗ͯ͠ Δˡ͜Ε͕νΣοΫʹͻ͔͔ͬΔݪҼͰ΋͋Δ େମͷ࣮૷͸DPOUBJOFSWJFXDPOUSPMMFSͷparent͕ࣗ෼Λอ༗ͯ͠ Δߏ੒ $POUBJOFSWJFXDPOUSPMMFS͕ϦʔΫνΣοΫʹೖΔલʹparent͕ࣗ ෼Λอ༗͍ͯͨ͠Βର৅֎ʹ͍ͨ͠ ͔͠͠ viewDidDisappear(_:)ͷͱ͖ʹ͸طʹparentϓϩύςΟ͸OJM

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Pattern of white list ද͕ࣔ੾ΓସΘΔ࣌ʹparent͕ࣗ਎Λอ༗͍ͯ͠Δ͔อଘ͍ͨ͠ ͦΕΛ΋ͬͯνΣοΫର৅֎ʹ͢Ε͹λϒͷ7$Λ໢ཏͰ͖Δ

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Pattern of white list ද͕ࣔ੾ΓସΘΔ࣌ʹ parent͕OJMͰ͸ͳ͍λΠϛϯάͰ͋Δ removeFromParent(:_) ΛTXJ[[MF parent͕ࣗ਎Λอ༗͍ͯ͠Δ͔อଘ͍ͨ͠ Mirrorobjc_{get,set}AssociatedObject

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Swizzle

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objc_{get,set}AssociatedObject

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Mirror parentQSPQFSUZͷܕ͸UIViewController? Ͱ͋ΔͷͰɺͲΜͳܗ ࣜͰTUPSFEQSPQFSUZʹอଘ͞Ε͍ͯΔ͔Θ͔Βͳ͍ ͦ͜ͰMirrorΛར༻͠ϦϑϨΫγϣϯͰTUPSFEQSPQFSUZΛ૸ࠪ ͢Δ

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Mirror ୯७ͳTUPSFEQSPQFSUZ

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Mirror "SSBZͰอ༗ ͜Ε͕ຆͲ

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Mirror %JDUͰอ༗ ݟͨ͜ͱͳ͍

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Simpliﬁed guard Ҏ্Swizzling AssociatedObject MirrorͷͭΛ ૊Έ߹ΘͤΔͱʜ

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Simpliﬁed guard ͜ͷHVBSEୡ͕ʜ

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Simpliﬁed guard ߦͰεοΩϦʂλϒͷ૿ݮʹ΋ࣗಈతʹରԠ

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Recap ▸ λϒతͳview controllerͰchild view controllerΛอ༗ ͯ͠Δέʔεʹ͓͍ͯɺλϒ੾ସ࣌ʹdeinit͞Ε͍ͯͳ ͍ͷ͸ϝϞϦϦʔΫͰ͸ͳ͍ʢద੾ʹͳ͍ͬͯΕ͹ʣ ▸ Swizzling, AssociatedObject, MirrorΛ૊Έ߹ΘͤΕ͹ parentͷܕ͕ෆ໌Ͱ΋stored propertyʹࣗ਎Λอ༗͠ ͍ͯΕ͹แׅతʹϦʔΫνΣοΫର৅֎ͱग़དྷΔ

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͓ΘΓ