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。

Transcript

1. cockscomb
2. גࣜձࣾ͸ͯͳ Application Engineer Hatena Blog, Hatena Space cockscomb
3. Hatena Engineer Seminar #2 ͸ͯͳʹ͓͚ΔϞμϯiOSΞϓϦ։ൃೖ໳
4. – @uzulla lυϥοάΞϯυυϩοϓ͸ࣦഊ͠΍͍ͬͯ͢%JT Γͭͭ$-*ͷDPDPB1PEΛࢍඒͨ͠௚ޙʹɺʮϚ ΢εͰ৭ʑͰ͖Δ4#ศརɺ͋ͱ͜͜Μͱ͜Ͱ %O%͢Δͱόʔ͕ͷͼͨΓ഑ஔͰ͖ͯศརʂʯͬ ͯݴ͏ͷ͍͢͝
   IBUFOBUFDIz
5. – @kazuph lϞμϯʹॻ͔ͳ͔ͬͨ৔߹ͱॻ͍ͨ৔߹Λίʔ υͰൺֱͨ͠΍ͭͷͰઆ໌Λͯ͘͠ΕͯΔͷͰ ͍͢͝ḿΔ
   IBUFOBUFDIz
6. ͜Ε͕MVC™Ͱ͢
7. UITableViewDataSource
8. Bookmarks View BookmarkManager - (NSArray *)bookmarks TableViewController Refer Update
9. in TableViewController [[IBKMBookmarkManager sharedManager] reloadBookmarksWithBlock:^(NSError *error) { if (error) { NSLog(@"Error: %@", error); } [self.tableView reloadData]; }];
10. Better Way [[IBKMBookmarkManager sharedManager] reloadBookmarksWithBlock:^(NSError *error) { if (error) { NSLog(@"Error: %@", error); } }];
11. Key Value Observation
12. Observe [[IBKMBookmarkManager sharedManager] addObserver:self forKeyPath:@"bookmarks" options:NSKeyValueObservingOptionNew context:nil];
13. - (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]; } }
14. in Bookmarks Manager [[self mutableArrayValueForKey:@"bookmarks"] insertObjects:newBookmarks atIndexes:[NSIndexSet indexSetWithIndexesInRange: NSMakeRange(0, newBookmarks.count)]]; Mutable array proxy
15. Bookmarks View BookmarkManager - (NSArray)bookmarks TableViewController Observe Notify Update
16. Is it, eh?
17. Problems • Lightweight view controller • Copy and paste? • Testability
18. 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;
19. Observer Data Source • Useful for many occasions • DRY • Testable • Applicable to UICollectionView
20. This is the MVC™
21. References Lighter View Controllers — objc.io Key-Value Coding and Observing — objc.io Key-Value Observing — NSHipster
22. ࡶஊίʔφʔ
23. ʰiOS Core Data పఈೖ໳ʱ • ࠷ॳͷ൒෼͘Β͍͸ಡ·ͳͯ͘΋͍͍ • Core Dataʹ͍͓͓ͭͯΑͦ໢ཏత • ೔ຊޠͷ৘ใ͋·Γͳ͍ͷͰՁ஋͕ߴ͍ • ϚϧνεϨουͷ͜ͱ͸ॻ͍ͯͳ͍ • ύϑΥʔϚϯεͷ͜ͱ΋ॻ͍ͯͳ͍
24. iOS 7 ྑ͗͢Δ • CFAutorelease() • NSArray -firstObject • TextKit • JavaScriptCore • Others
25. WebView JavaScript Bridging • - webView:
 shouldStartLoadWithRequest:
 navigationType: • Cordova • WebViewJavascriptBridge • JSContext JSContext *ctx = [self.webView valueForKeyPath: @"documentView.webView.mainFrame.javaScriptContext"]; JSValue *three = [ctx evaluateScript:@“1+2"];
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