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NSCacheʹ͍ͭͯ id:ninjinkun / @ninjinkun

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ΞδΣϯμ • NSCacheͱ͸ • ࢖͍ํ • αϯϓϧ • http://github.com/ninjinkun/NSCacheTest • InstagramͷΞϓϦొ࿥͕ඞཁ

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֓ཁ NSCacheͱ͸ • ΩϟογϡϞδϡʔϧ • iOS 4.0͔Βಋೖ • εϨουηʔϑ • ֨ೲ্ݶΛઃఆՄೳ

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༻్ NSCacheͱ͸ • ը૾Ωϟογϡ • αΠζ͕Ͱ͔͍ͷͰΦϯϝϞϦʹͣͬͱஔ͚ͳ͍ • μ΢ϯϩʔυͨ͠΋ͷΛҰ࣌తʹอଘ͢Δ • ͦͷଞɺ༰ྔ͕େ͖ͯ͘ɺ͍Ζ͍ΖͳεϨου͔ΒΞ Ϋηε͞Εͦ͏ͳ΋ͷͳΒԿͰ΋…

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࢖͍ํ • ίʔυΛݟͤΔ • ImageLoaderΫϥεʹ͝஫໨͍ͩ͘͞

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্ݶͷܾఆ ࢖͍ํ • ΦϒδΣΫτͷݸ਺ • setCountLimit: • ΦϒδΣΫτͷίετ • setTotalCostLimit • ίετ͸set࣌ʹࣗ෼ͰܾΊΔ • setObject:forKey:cost:

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Evictionͷ৚݅ ࢖͍ํ • Կݸ͔ͷΞϧΰϦζϜΛ૊Έ߹Θ͍ͤͯΔΒ͍͠ • جຊతʹ͸LRU (Least Recently Used) Ά͍ • ࠷ޙʹ࢖ͬͨ΋ͷΛ࢒͢ • ίετ or αΠζ্͕ݶΛ௒͑ͨΒevict

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NSCacheͱ࿈ܞ͢ΔΫϥε ͓·͚ • NSDiscardableContent • ഁغՄೳͳσʔλΛදݱ͢Δϓϩτίϧ • ഁغՄೳ͔Λ໰͍߹ΘͤΔϝιου͕͋Δ • NSPurgeableData • NSMutableDataͷࢠΫϥε

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·ͱΊ • ը૾Ωϟογϡʹ͸NSCache • εϨουηʔϑ • লϝϞϦ • LRU