KVC Collection Operators

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@questbeat KVC Collection Operators

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http://github.com/questbeat/ KVCCollectionOperatorsExample

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KVC Collection Operators

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KVC Collection Operators

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Key-Value Coding

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Key-Value Coding • ΦϒδΣΫτͷϓϩύςΟʹ  ؒ઀తʹΞΫηε͢ΔͨΊͷ࢓૊Έ • Key (จࣈྻ)Λ࢖ͬͯϓϩύςΟΛࣝผ͢Δ [status valueForKey:@“text”]; ! => @“Hi, friends!”

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Key-Value Coding • KeyPath • υοτͰ۠੾ΒΕͨෳ਺ͷΩʔ͔Β  ͳΔจࣈྻ [status valueForKeyPath: @“user.screen_name”]; ! => @“questbeat”

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KVC Collection Operators

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KVC Collection Operators • ίϨΫγϣϯԋࢉࢠ • valueForKeyPath: Ͱ࢖͑Δԋࢉࢠ • @ ͔Β࢝·Δจࣈྻ • @count, @sum, @avg ͳͲ

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KVC Collection Operators [email protected] ԋࢉͰ࢖༻͢Δ  ഑ྻ΍ू߹΁ͷ  KeyPath ԋࢉࢠ ԋࢉͰ࢖༻͢Δ  (ίϨΫγϣϯ಺ͷ  ཁૉͷ)ϓϩύςΟ ΁ͷ KeyPath ԋࢉࢠΛ࢖ͬͨ KeyPath ͷॻࣜ

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KVC Collection Operators ྫ͑͹, Qiita ͷΫϥΠΞϯτΞϓϦͰ User @property NSArray *items; Item @property NSUInteger stockCount;

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KVC Collection Operators [email protected] ͜ͷͱ͖, user ʹର͢ΔҎԼͷ KeyPath ͸ user.items ͷ ֤ཁૉ͔ΒऔΓग़ͨ͠ stockCount ͷฏۉ Λද͢ (NSNumber)

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KVC Collection Operators • 3छྨͷԋࢉࢠ • Simple Collection Operators  (୯७ܕίϨΫγϣϯԋࢉࢠ) • Object Operators  (ΦϒδΣΫτԋࢉࢠ) • Array and Set Operators  (഑ྻɾू߹ԋࢉࢠ)

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Simple Collection Operators

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@interface Fruit : NSObject ! @property NSString *name; @property double price; @property NSDate *boughtAt; ! @end

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NSArray *basket = @[ apple, banana, orange, grape ]; price boughtAt Apple 100 2014/04/08 Banana 120 2014/03/18 Orange 200 2014/03/27 Grape 300 2014/04/14

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Simple Collection Operators @count [basket valueForKeyPath:@“@count”]; ! => @(4) • ίϨΫγϣϯͷཁૉ਺Λฦ͢ (NSNumber) • ԋࢉࢠӈଆͷ KeyPath ͸ແࢹ͞ΕΔ

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Simple Collection Operators @sum [basket valueForKeyPath:@“@sum.price”]; ! => @(720) • ϓϩύςΟ஋ͷ߹ܭΛฦ͢ (NSNumber) • ஋Λ double ʹม׵͔ͯ͠Β߹ܭ͢Δ

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Simple Collection Operators @avg [basket valueForKeyPath:@“@avg.price”]; ! => @(180) • ϓϩύςΟ஋ͷฏۉ஋Λฦ͢ (NSNumber) • ஋Λ double ʹม׵͔ͯ͠Βฏۉ͢Δ

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Simple Collection Operators @max [basket valueForKeyPath:@“@max.price”]; ! => @(300) • ϓϩύςΟͷ஋͕࠷େͷ΋ͷΛฦ͢ • ஋Λ compare: Ͱൺֱ͢Δ

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Simple Collection Operators @max [basket valueForKeyPath:@“@max.boughtAt”]; ! => 2014-04-13 15:00:00 +0000 • ϓϩύςΟͷ஋͕࠷େͷ΋ͷΛฦ͢ • ஋Λ compare: Ͱൺֱ͢Δ

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Simple Collection Operators @min [basket valueForKeyPath:@“@min.price”]; ! => @(100) • ϓϩύςΟͷ஋͕࠷খͷ΋ͷΛฦ͢ • ஋Λ compare: Ͱൺֱ͢Δ

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Simple Collection Operators ͜͜·Ͱͷ·ͱΊ • @count • @sum • @avg • @max • @min

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Object Operators

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NSArray *basket = @[ apple, apple, banana, orange, grape ];

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Object Operators @unionOfObjects [basket valueForKeyPath: @“@unionOfObjects.name”]; ! => @[ @“Apple”, @“Apple”, @“Banana”, @“Orange, @“Grape” ] • ϓϩύςΟͷ஋Λ·ͱΊͯ NSArray Ͱฦ͢ • ॏෳ͕͋ͬͯ΋ͦͷ··

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Object Operators @distinctUnionOfObjects [basket valueForKeyPath: @“@distinctUnionOfObjects.name”]; ! => @[ @“Apple”, @“Orange” @“Banana, @“Grape” ] • ϓϩύςΟͷ஋Λ·ͱΊͯ NSArray Ͱฦ͢ • ॏෳΛऔΓআ͘

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• @unionOfObjects • @distinctUnionOfObjects Object Operators ͜͜·Ͱͷ·ͱΊ

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Array and Set Operators

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NSArray *hogeStoreInventory = @[ apple, banana ]; ! NSArray *piyoStoreInventory = @[ apple, orange ]; ! NSArray *inventories = @[ hogeStoreInventory, piyoStoreInventory ];

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Array and Set Operators @unionOfArrays [inventories valueForKeyPath: @“@unionOfArrays.name”]; ! => @[ @“Apple”, @“Banana” @“Apple, @“Orange” ] • ίϨΫγϣϯʹؚ·ΕΔ֤഑ྻͷ  ϓϩύςΟͷ஋Λ·ͱΊͯ NSArray Ͱฦ͢

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Array and Set Operators @distinctUnionOfArrays [inventories valueForKeyPath: @“@unionOfArrays.name”]; ! => @[ @“Apple”, @“Orange”, @“Banana” ] • ίϨΫγϣϯʹؚ·ΕΔ֤഑ྻͷ  ϓϩύςΟͷ஋Λ·ͱΊͯ NSArray Ͱฦ͢ • ॏෳΛऔΓআ͘

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Array and Set Operators @distinctUnionOfSets • @distinctUnionOfArrays ͱಉ༷͕ͩ  NSSet ΛؚΉ NSSet ͕ର৅ • ίϨΫγϣϯʹؚ·ΕΔ֤ू߹ͷ  ϓϩύςΟͷ஋Λ·ͱΊͯ NSSet Ͱฦ͢ • ॏෳΛऔΓআ͘

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• @unionOfArrays • @distinctUnionOfArrays • @distinctUnionOfSets ͜͜·Ͱͷ·ͱΊ Array and Set Operators

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• Collection Operators • valueForKeyPath: Ͱ࢖͑Δԋࢉࢠ • 3छྨͷԋࢉࢠ • Simple Collection Operators • Object Operators • Array and Set Operators Summary

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• ศརͬΆ͍͚Ͳ, ࢖͏ʁ Summary

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• Cocoa Bindings Ͱ͸େ׆༂ʂ Summary

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Thanks! • ຊ೔ͷαϯϓϧίʔυ • http://github.com/questbeat/ KVCCollectionOperatorsExample • ࢀߟ • Ωʔ஋ίʔσΟϯάϓϩάϥϛϯάΨΠυ  https://developer.apple.com/jp/devcenter/ios/ library/documentation/KeyValueCoding.pdf • KVC Collection Operators - NSHipster  http://nshipster.com/kvc-collection-operators/