KVC Collection Operators

第55回Cocoa勉強会関西での発表に使用したスライドです。

Transcript

1. @questbeat KVC Collection Operators
2. http://github.com/questbeat/ KVCCollectionOperatorsExample
3. KVC Collection Operators
4. KVC Collection Operators
5. Key-Value Coding
6. Key-Value Coding • ΦϒδΣΫτͷϓϩύςΟʹ
 ؒ઀తʹΞΫηε͢ΔͨΊͷ࢓૊Έ • Key (จࣈྻ)Λ࢖ͬͯϓϩύςΟΛࣝผ͢Δ [status valueForKey:@“text”]; ! => @“Hi, friends!”
7. Key-Value Coding • KeyPath • υοτͰ۠੾ΒΕͨෳ਺ͷΩʔ͔Β
 ͳΔจࣈྻ [status valueForKeyPath: @“user.screen_name”]; ! => @“questbeat”
8. KVC Collection Operators
9. KVC Collection Operators • ίϨΫγϣϯԋࢉࢠ • valueForKeyPath: Ͱ࢖͑Δԋࢉࢠ • @ ͔Β࢝·Δจࣈྻ • @count, @sum, @avg ͳͲ
10. KVC Collection Operators collection.@operator.property ԋࢉͰ࢖༻͢Δ
 ഑ྻ΍ू߹΁ͷ
 KeyPath ԋࢉࢠ ԋࢉͰ࢖༻͢Δ
 (ίϨΫγϣϯ಺ͷ
 ཁૉͷ)ϓϩύςΟ ΁ͷ KeyPath ԋࢉࢠΛ࢖ͬͨ KeyPath ͷॻࣜ
11. KVC Collection Operators ྫ͑͹, Qiita ͷΫϥΠΞϯτΞϓϦͰ User @property NSArray *items; Item @property NSUInteger stockCount;
12. KVC Collection Operators items.@avg.stockCount ͜ͷͱ͖, user ʹର͢ΔҎԼͷ KeyPath ͸ user.items ͷ ֤ཁૉ͔ΒऔΓग़ͨ͠ stockCount ͷฏۉ Λද͢ (NSNumber)
13. KVC Collection Operators • 3छྨͷԋࢉࢠ • Simple Collection Operators
 (୯७ܕίϨΫγϣϯԋࢉࢠ) • Object Operators
 (ΦϒδΣΫτԋࢉࢠ) • Array and Set Operators
 (഑ྻɾू߹ԋࢉࢠ)
14. Simple Collection Operators
15. @interface Fruit : NSObject ! @property NSString *name; @property double price; @property NSDate *boughtAt; ! @end
16. 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
17. Simple Collection Operators @count [basket valueForKeyPath:@“@count”]; ! => @(4) • ίϨΫγϣϯͷཁૉ਺Λฦ͢ (NSNumber) • ԋࢉࢠӈଆͷ KeyPath ͸ແࢹ͞ΕΔ
18. Simple Collection Operators @sum [basket valueForKeyPath:@“@sum.price”]; ! => @(720) • ϓϩύςΟ஋ͷ߹ܭΛฦ͢ (NSNumber) • ஋Λ double ʹม׵͔ͯ͠Β߹ܭ͢Δ
19. Simple Collection Operators @avg [basket valueForKeyPath:@“@avg.price”]; ! => @(180) • ϓϩύςΟ஋ͷฏۉ஋Λฦ͢ (NSNumber) • ஋Λ double ʹม׵͔ͯ͠Βฏۉ͢Δ
20. Simple Collection Operators @max [basket valueForKeyPath:@“@max.price”]; ! => @(300) • ϓϩύςΟͷ஋͕࠷େͷ΋ͷΛฦ͢ • ஋Λ compare: Ͱൺֱ͢Δ
21. Simple Collection Operators @max [basket valueForKeyPath:@“@max.boughtAt”]; ! => 2014-04-13 15:00:00 +0000 • ϓϩύςΟͷ஋͕࠷େͷ΋ͷΛฦ͢ • ஋Λ compare: Ͱൺֱ͢Δ
22. Simple Collection Operators @min [basket valueForKeyPath:@“@min.price”]; ! => @(100) • ϓϩύςΟͷ஋͕࠷খͷ΋ͷΛฦ͢ • ஋Λ compare: Ͱൺֱ͢Δ
23. Simple Collection Operators ͜͜·Ͱͷ·ͱΊ • @count • @sum • @avg • @max • @min
24. Object Operators
25. NSArray *basket = @[ apple, apple, banana, orange, grape ];
26. Object Operators @unionOfObjects [basket valueForKeyPath: @“@unionOfObjects.name”]; ! => @[ @“Apple”, @“Apple”, @“Banana”, @“Orange, @“Grape” ] • ϓϩύςΟͷ஋Λ·ͱΊͯ NSArray Ͱฦ͢ • ॏෳ͕͋ͬͯ΋ͦͷ··
27. Object Operators @distinctUnionOfObjects [basket valueForKeyPath: @“@distinctUnionOfObjects.name”]; ! => @[ @“Apple”, @“Orange” @“Banana, @“Grape” ] • ϓϩύςΟͷ஋Λ·ͱΊͯ NSArray Ͱฦ͢ • ॏෳΛऔΓআ͘
28. • @unionOfObjects • @distinctUnionOfObjects Object Operators ͜͜·Ͱͷ·ͱΊ
29. Array and Set Operators
30. NSArray *hogeStoreInventory = @[ apple, banana ]; ! NSArray *piyoStoreInventory = @[ apple, orange ]; ! NSArray *inventories = @[ hogeStoreInventory, piyoStoreInventory ];
31. Array and Set Operators @unionOfArrays [inventories valueForKeyPath: @“@unionOfArrays.name”]; ! => @[ @“Apple”, @“Banana” @“Apple, @“Orange” ] • ίϨΫγϣϯʹؚ·ΕΔ֤഑ྻͷ
 ϓϩύςΟͷ஋Λ·ͱΊͯ NSArray Ͱฦ͢
32. Array and Set Operators @distinctUnionOfArrays [inventories valueForKeyPath: @“@unionOfArrays.name”]; ! => @[ @“Apple”, @“Orange”, @“Banana” ] • ίϨΫγϣϯʹؚ·ΕΔ֤഑ྻͷ
 ϓϩύςΟͷ஋Λ·ͱΊͯ NSArray Ͱฦ͢ • ॏෳΛऔΓআ͘
33. Array and Set Operators @distinctUnionOfSets • @distinctUnionOfArrays ͱಉ༷͕ͩ
 NSSet ΛؚΉ NSSet ͕ର৅ • ίϨΫγϣϯʹؚ·ΕΔ֤ू߹ͷ
 ϓϩύςΟͷ஋Λ·ͱΊͯ NSSet Ͱฦ͢ • ॏෳΛऔΓআ͘
34. • @unionOfArrays • @distinctUnionOfArrays • @distinctUnionOfSets ͜͜·Ͱͷ·ͱΊ Array and Set Operators
35. • Collection Operators • valueForKeyPath: Ͱ࢖͑Δԋࢉࢠ • 3छྨͷԋࢉࢠ • Simple Collection Operators • Object Operators • Array and Set Operators Summary
36. • ศརͬΆ͍͚Ͳ, ࢖͏ʁ Summary
37. • Cocoa Bindings Ͱ͸େ׆༂ʂ Summary
38. 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/