Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
KVC Collection Operators
Search
Katsuma Tanaka
April 19, 2014
Technology
0
270
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。
Katsuma Tanaka
April 19, 2014
Tweet
Share
More Decks by Katsuma Tanaka
See All by Katsuma Tanaka
Plug-in Architectures in Cocoa
questbeat
1
660
Other Decks in Technology
See All in Technology
Exadata Database Service on Dedicated Infrastructure(ExaDB-D) UI スクリーン・キャプチャ集
oracle4engineer
PRO
3
5.5k
『バイトル』CTOが語る! AIネイティブ世代と切り拓くモノづくり組織
dip_tech
PRO
1
110
小学4年生夏休みの自由研究「ぼくと Copilot エージェント」
taichinakamura
0
580
LLM時代にデータエンジニアの役割はどう変わるか?
ikkimiyazaki
6
1.2k
Simplifying Cloud Native app testing across environments with Dapr and Microcks
salaboy
0
120
[Keynote] What do you need to know about DevEx in 2025
salaboy
0
150
能登半島地震で見えた災害対応の課題と組織変革の重要性
ditccsugii
0
240
Azure Well-Architected Framework入門
tomokusaba
1
350
AIAgentの限界を超え、 現場を動かすWorkflowAgentの設計と実践
miyatakoji
1
160
フルカイテン株式会社 エンジニア向け採用資料
fullkaiten
0
9.1k
ガバメントクラウド(AWS)へのデータ移行戦略の立て方【虎の巻】 / 20251011 Mitsutosi Matsuo
shift_evolve
PRO
2
180
Function calling機能をPLaMo2に実装するには / PFN LLMセミナー
pfn
PRO
0
1k
Featured
See All Featured
Faster Mobile Websites
deanohume
310
31k
[RailsConf 2023] Rails as a piece of cake
palkan
57
5.9k
The Language of Interfaces
destraynor
162
25k
What's in a price? How to price your products and services
michaelherold
246
12k
Done Done
chrislema
185
16k
Navigating Team Friction
lara
189
15k
Fashionably flexible responsive web design (full day workshop)
malarkey
407
66k
RailsConf & Balkan Ruby 2019: The Past, Present, and Future of Rails at GitHub
eileencodes
140
34k
The Myth of the Modular Monolith - Day 2 Keynote - Rails World 2024
eileencodes
26
3.1k
Build The Right Thing And Hit Your Dates
maggiecrowley
37
2.9k
Designing for Performance
lara
610
69k
Git: the NoSQL Database
bkeepers
PRO
431
66k
Transcript
@questbeat KVC Collection Operators
http://github.com/questbeat/ KVCCollectionOperatorsExample
KVC Collection Operators
KVC Collection Operators
Key-Value Coding
Key-Value Coding • ΦϒδΣΫτͷϓϩύςΟʹ ؒతʹΞΫηε͢ΔͨΊͷΈ • Key (จࣈྻ)ΛͬͯϓϩύςΟΛࣝผ͢Δ [status valueForKey:@“text”];
! => @“Hi, friends!”
Key-Value Coding • KeyPath • υοτͰ۠ΒΕͨෳͷΩʔ͔Β ͳΔจࣈྻ [status valueForKeyPath: @“user.screen_name”];
! => @“questbeat”
KVC Collection Operators
KVC Collection Operators • ίϨΫγϣϯԋࢉࢠ • valueForKeyPath: Ͱ͑Δԋࢉࢠ • @
͔Β࢝·Δจࣈྻ • @count, @sum, @avg ͳͲ
KVC Collection Operators
[email protected]
ԋࢉͰ༻͢Δ ྻू߹ͷ KeyPath ԋࢉࢠ ԋࢉͰ༻͢Δ (ίϨΫγϣϯͷ
ཁૉͷ)ϓϩύςΟ ͷ KeyPath ԋࢉࢠΛͬͨ KeyPath ͷॻࣜ
KVC Collection Operators ྫ͑, Qiita ͷΫϥΠΞϯτΞϓϦͰ User @property NSArray *items;
Item @property NSUInteger stockCount;
KVC Collection Operators
[email protected]
͜ͷͱ͖, user ʹର͢ΔҎԼͷ KeyPath user.items
ͷ ֤ཁૉ͔ΒऔΓग़ͨ͠ stockCount ͷฏۉ Λද͢ (NSNumber)
KVC Collection Operators • 3छྨͷԋࢉࢠ • Simple Collection Operators (୯७ܕίϨΫγϣϯԋࢉࢠ)
• Object Operators (ΦϒδΣΫτԋࢉࢠ) • Array and Set Operators (ྻɾू߹ԋࢉࢠ)
Simple Collection Operators
@interface Fruit : NSObject ! @property NSString *name; @property double
price; @property NSDate *boughtAt; ! @end
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
Simple Collection Operators @count [basket valueForKeyPath:@“@count”]; ! => @(4) •
ίϨΫγϣϯͷཁૉΛฦ͢ (NSNumber) • ԋࢉࢠӈଆͷ KeyPath ແࢹ͞ΕΔ
Simple Collection Operators @sum [basket valueForKeyPath:@“@sum.price”]; ! => @(720) •
ϓϩύςΟͷ߹ܭΛฦ͢ (NSNumber) • Λ double ʹม͔ͯ͠Β߹ܭ͢Δ
Simple Collection Operators @avg [basket valueForKeyPath:@“@avg.price”]; ! => @(180) •
ϓϩύςΟͷฏۉΛฦ͢ (NSNumber) • Λ double ʹม͔ͯ͠Βฏۉ͢Δ
Simple Collection Operators @max [basket valueForKeyPath:@“@max.price”]; ! => @(300) •
ϓϩύςΟͷ͕࠷େͷͷΛฦ͢ • Λ compare: Ͱൺֱ͢Δ
Simple Collection Operators @max [basket valueForKeyPath:@“@max.boughtAt”]; ! => 2014-04-13 15:00:00
+0000 • ϓϩύςΟͷ͕࠷େͷͷΛฦ͢ • Λ compare: Ͱൺֱ͢Δ
Simple Collection Operators @min [basket valueForKeyPath:@“@min.price”]; ! => @(100) •
ϓϩύςΟͷ͕࠷খͷͷΛฦ͢ • Λ compare: Ͱൺֱ͢Δ
Simple Collection Operators ͜͜·Ͱͷ·ͱΊ • @count • @sum • @avg
• @max • @min
Object Operators
NSArray *basket = @[ apple, apple, banana, orange, grape ];
Object Operators @unionOfObjects [basket valueForKeyPath: @“@unionOfObjects.name”]; ! => @[ @“Apple”,
@“Apple”, @“Banana”, @“Orange, @“Grape” ] • ϓϩύςΟͷΛ·ͱΊͯ NSArray Ͱฦ͢ • ॏෳ͕͋ͬͯͦͷ··
Object Operators @distinctUnionOfObjects [basket valueForKeyPath: @“@distinctUnionOfObjects.name”]; ! => @[ @“Apple”,
@“Orange” @“Banana, @“Grape” ] • ϓϩύςΟͷΛ·ͱΊͯ NSArray Ͱฦ͢ • ॏෳΛऔΓআ͘
• @unionOfObjects • @distinctUnionOfObjects Object Operators ͜͜·Ͱͷ·ͱΊ
Array and Set Operators
NSArray *hogeStoreInventory = @[ apple, banana ]; ! NSArray *piyoStoreInventory
= @[ apple, orange ]; ! NSArray *inventories = @[ hogeStoreInventory, piyoStoreInventory ];
Array and Set Operators @unionOfArrays [inventories valueForKeyPath: @“@unionOfArrays.name”]; ! =>
@[ @“Apple”, @“Banana” @“Apple, @“Orange” ] • ίϨΫγϣϯʹؚ·ΕΔ֤ྻͷ ϓϩύςΟͷΛ·ͱΊͯ NSArray Ͱฦ͢
Array and Set Operators @distinctUnionOfArrays [inventories valueForKeyPath: @“@unionOfArrays.name”]; ! =>
@[ @“Apple”, @“Orange”, @“Banana” ] • ίϨΫγϣϯʹؚ·ΕΔ֤ྻͷ ϓϩύςΟͷΛ·ͱΊͯ NSArray Ͱฦ͢ • ॏෳΛऔΓআ͘
Array and Set Operators @distinctUnionOfSets • @distinctUnionOfArrays ͱಉ༷͕ͩ NSSet ΛؚΉ
NSSet ͕ର • ίϨΫγϣϯʹؚ·ΕΔ֤ू߹ͷ ϓϩύςΟͷΛ·ͱΊͯ NSSet Ͱฦ͢ • ॏෳΛऔΓআ͘
• @unionOfArrays • @distinctUnionOfArrays • @distinctUnionOfSets ͜͜·Ͱͷ·ͱΊ Array and Set
Operators
• Collection Operators • valueForKeyPath: Ͱ͑Δԋࢉࢠ • 3छྨͷԋࢉࢠ • Simple
Collection Operators • Object Operators • Array and Set Operators Summary
• ศརͬΆ͍͚Ͳ, ͏ʁ Summary
• Cocoa Bindings Ͱେ׆༂ʂ Summary
Thanks! • ຊͷαϯϓϧίʔυ • http://github.com/questbeat/ KVCCollectionOperatorsExample • ࢀߟ • ΩʔίʔσΟϯάϓϩάϥϛϯάΨΠυ
https://developer.apple.com/jp/devcenter/ios/ library/documentation/KeyValueCoding.pdf • KVC Collection Operators - NSHipster http://nshipster.com/kvc-collection-operators/