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
Cocoa勉強会関西#53
Search
cockscomb
December 14, 2013
Programming
3
580
Cocoa勉強会関西#53
Key Value Observationを利用するUITableViewDataSourceについて話しました。雑談コーナーもあります。
cockscomb
December 14, 2013
Tweet
Share
More Decks by cockscomb
See All by cockscomb
jq at the Shortcuts
cockscomb
1
1.9k
GraphQL放談
cockscomb
4
2k
GraphQL Highway
cockscomb
28
8.5k
吉田を支える技術
cockscomb
0
2.4k
コーポレートサイトを静的化してAmplify Consoleにデプロイする
cockscomb
0
3.4k
ユーザインターフェイスと非同期処理
cockscomb
5
1.9k
GUIアプリケーションの構造と設計
cockscomb
10
10k
イカリング2におけるシングルページアプリケーション
cockscomb
2
7.5k
あなたの知らない UIKit の世界 — UITableView に UITextView を置きたい
cockscomb
1
7.5k
Other Decks in Programming
See All in Programming
Flutter로 Gemini와 MCP를 활용한 Agentic App 만들기 - 박제창 2025 I/O Extended Seoul
itsmedreamwalker
0
130
新世界の理解
koriym
0
130
Vibe coding コードレビュー
kinopeee
0
430
Claude Code と OpenAI o3 で メタデータ情報を作る
laket
0
120
Flutterと Vibe Coding で個人開発!
hyshu
1
250
iOS開発スターターキットの作り方
akidon0000
0
240
AHC051解法紹介
eijirou
0
400
MCP連携で加速するAI駆動開発/mcp integration accelerates ai-driven-development
bpstudy
0
290
バイブコーディングの正体——AIエージェントはソフトウェア開発を変えるか?
stakaya
5
860
Dart 参戦!!静的型付き言語界の隠れた実力者
kno3a87
0
190
Google I/O Extended Incheon 2025 ~ What's new in Android development tools
pluu
1
250
中級グラフィックス入門~効率的なメッシュレット描画~
projectasura
4
2.6k
Featured
See All Featured
Templates, Plugins, & Blocks: Oh My! Creating the theme that thinks of everything
marktimemedia
31
2.5k
Documentation Writing (for coders)
carmenintech
73
5k
Why You Should Never Use an ORM
jnunemaker
PRO
58
9.5k
GitHub's CSS Performance
jonrohan
1031
460k
Producing Creativity
orderedlist
PRO
347
40k
It's Worth the Effort
3n
185
28k
Designing for Performance
lara
610
69k
How to Create Impact in a Changing Tech Landscape [PerfNow 2023]
tammyeverts
53
2.9k
Stop Working from a Prison Cell
hatefulcrawdad
271
21k
The Illustrated Children's Guide to Kubernetes
chrisshort
48
50k
Making the Leap to Tech Lead
cromwellryan
134
9.5k
GraphQLとの向き合い方2022年版
quramy
49
14k
Transcript
cockscomb
גࣜձࣾͯͳ Application Engineer Hatena Blog, Hatena Space cockscomb
Hatena Engineer Seminar #2 ͯͳʹ͓͚ΔϞμϯiOSΞϓϦ։ൃೖ
– @uzulla lυϥοάΞϯυυϩοϓࣦഊ͍ͬͯ͢͠%JT Γͭͭ$-*ͷDPDPB1PEΛࢍඒͨ͠ޙʹɺʮϚ εͰ৭ʑͰ͖Δ4#ศརɺ͋ͱ͜͜Μͱ͜Ͱ %O%͢Δͱόʔ͕ͷͼͨΓஔͰ͖ͯศརʂʯͬ ͯݴ͏ͷ͍͢͝IBUFOBUFDIz
– @kazuph lϞμϯʹॻ͔ͳ͔ͬͨ߹ͱॻ͍ͨ߹Λίʔ υͰൺֱͨͭ͠ͷͰઆ໌Λͯ͘͠ΕͯΔͷͰ ͍͢͝ḿΔIBUFOBUFDIz
͜Ε͕MVC™Ͱ͢
UITableViewDataSource
Bookmarks View BookmarkManager - (NSArray *)bookmarks TableViewController Refer Update
in TableViewController [[IBKMBookmarkManager sharedManager] reloadBookmarksWithBlock:^(NSError *error) { if (error) {
NSLog(@"Error: %@", error); } [self.tableView reloadData]; }];
Better Way [[IBKMBookmarkManager sharedManager] reloadBookmarksWithBlock:^(NSError *error) { if (error) {
NSLog(@"Error: %@", error); } }];
Key Value Observation
Observe [[IBKMBookmarkManager sharedManager] addObserver:self forKeyPath:@"bookmarks" options:NSKeyValueObservingOptionNew context:nil];
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context { if
(object == [IBKMBookmarkManager sharedManager] && [keyPath isEqualToString:@"bookmarks"]) { NSIndexSet *indexSet = change[NSKeyValueChangeIndexesKey]; NSKeyValueChange changeKind = (NSKeyValueChange)[change[NSKeyValueChangeKindKey] integerValue]; ! NSMutableArray *indexPaths = [NSMutableArray array]; [indexSet enumerateIndexesUsingBlock:^(NSUInteger index, BOOL *stop) { [indexPaths addObject:[NSIndexPath indexPathForRow:index inSection:0]]; }]; ! [self.tableView beginUpdates]; if (changeKind == NSKeyValueChangeInsertion) { [self.tableView insertRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationAutomatic]; } else if (changeKind == NSKeyValueChangeRemoval) { [self.tableView deleteRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationAutomatic]; } else if (changeKind == NSKeyValueChangeReplacement) { [self.tableView reloadRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationAutomatic]; } [self.tableView endUpdates]; } }
in Bookmarks Manager [[self mutableArrayValueForKey:@"bookmarks"] insertObjects:newBookmarks atIndexes:[NSIndexSet indexSetWithIndexesInRange: NSMakeRange(0, newBookmarks.count)]];
Mutable array proxy
Bookmarks View BookmarkManager - (NSArray)bookmarks TableViewController Observe Notify Update
Is it, eh?
Problems • Lightweight view controller • Copy and paste? •
Testability
The Best Way self.observerDataSource = [[ObserverTableViewDataSource alloc] initWithObserved:[IBKMBookmarkManager sharedManager] keyPath:NSStringFromSelector(@selector(bookmarks))
tableView:self.tableView superDataSource:self]; ! self.observerDataSource.configureCell = ^UITableViewCell *(UITableView *tableView, NSIndexPath *indexPath, id object) { static NSString *const CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath]; ! ... ! return cell; }; ! self.tableView.dataSource = self.observerDataSource;
Observer Data Source • Useful for many occasions • DRY
• Testable • Applicable to UICollectionView
This is the MVC™
References Lighter View Controllers — objc.io Key-Value Coding and Observing
— objc.io Key-Value Observing — NSHipster
ࡶஊίʔφʔ
ʰiOS Core Data పఈೖʱ • ࠷ॳͷ͘Β͍ಡ·ͳ͍͍ͯ͘ • Core Dataʹ͍͓͓ͭͯΑͦཏత •
ຊޠͷใ͋·Γͳ͍ͷͰՁ͕ߴ͍ • ϚϧνεϨουͷ͜ͱॻ͍ͯͳ͍ • ύϑΥʔϚϯεͷ͜ͱॻ͍ͯͳ͍
iOS 7 ྑ͗͢Δ • CFAutorelease() • NSArray -firstObject • TextKit
• JavaScriptCore • Others
WebView JavaScript Bridging • - webView: shouldStartLoadWithRequest: navigationType: • Cordova
• WebViewJavascriptBridge • JSContext JSContext *ctx = [self.webView valueForKeyPath: @"documentView.webView.mainFrame.javaScriptContext"]; JSValue *three = [ctx evaluateScript:@“1+2"];
ੵۃ࠾༻த http://www.hatena.ne.jp/company/staff