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Cocoa勉強会関西#53
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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
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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