Blocksの活用法
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Description about Blocks in Objective-C.
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Blocksの活用法
- 1. Blocksの活用 iOS版 Hidetoshi Mori
- 4. Blocks？ ？ iOS4, MacOSX 10.6から導入 無名関数、クロージャ、 Lambda
- 6. Blocksの構文 ^戻り値の型(引数リスト)｛処理｝ （実装） ^NSInteger(NSInteger i){ return i++; } ^{ NSLog(@”block”); } ※戻り値の型voidと（引数無し）は省略可 戻り値の型 (^Block変数名)(引数リスト); （宣言） id (^block)(NSArray *array, NSUInteger index); void (^block)(void);
- 7. Block内の自動変数 int val = 1; void (^block)(void) = ^{NSLog(@”val=%d”, val)}; val = 2; block(); //blockの実行 > val=1 Block定義時点のローカル変数がコピーされる
- 8. __block指定子 __block int val = 1; void (^block)(void) = ^{val=2)}; block(); NSLog(@”val=%d”, val); > val=2 Blockスコープを超えるには__blockを使う
- 9. Blockの格納領域 グローバル(データ)領域 (グローバル変数領域) _NSConcreteGlobalBlock ヒープ領域 (オブジェクト変数領域) _NSConcreteMallocBlock スタック領域 (ローカル変数領域) _NSConcreteStackBlock
- 10. Blockのコピー Blockはプリミティブ変数らしきもの スタック領域Blockはスコープ終了後、破棄される Blockを維持するためヒープ領域に手動コピーが必要 Blockのpropertyは基本 copy で宣言する
- 12. Blockによる循環参照 BlockのBlock内変数への強参照による循環参照 @property (retain) NSMutableArray array; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -(void)addBlock { id block = ^{ [self method]; self array }; [array addObject block]; } block
- 13. Blockによる循環参照回避 BlockのBlock内変数への参照を弱参照にする @property (retain) NSMutableArray array; ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -(void)addBlock { __block __weak MyClass *weakSelf = self; id block = ^{ self array [weakSelf method]; }; [array addObject block]; } block
- 17. BlocksKitの導入手順 BlocksKit/A2DynamicDelegate/に２クラスをコピー A2BlockDelegaete、A2DynamicDelegate 自分のプロジェクトにBlocksKit.xcodeprojを追加 libBlocksKit.a、MessageUI.frameworkを追加 その他リンカフラグに「-ObjC -all_load」を追加 ヘッダ検索パスに/BlocksKit**を設定 pchにBlocksKit/BlocksKit.hをimport
- 18. BlocksKitの便利メソッド UIActionSheet#addButtonWithTitle:handler: - (void)showSheet1 { UIActionSheet *sheet1 = [UIActionSheet actionSheetWithTitle:@"Sheet"]; if (condition1) { [sheet1 addButtonWithTitle:@"Action1" handler:^(void) { //Action1の処理 }]; } [sheet1 setCancelButtonIndex:[sheet addButtonWithTitle:@"Close"]]; [sheet1 showInView:self.view]; }
- 19. BlocksKitの便利メソッド UIAlertView#addButtonWithTitle:handler: UIAlertView *alert = [UIAlertView alertViewWithTitle:@"Alert" message:@"UIAlertView Test"]; [alert addButtonWithTitle:@"Action" handler:^(void) { NSLog(@"Action"); }]; [alert addButtonWithTitle:@"Close"]; [alert show];
- 20. BlocksKitの便利メソッド NSURLConnection#startConnectionWithRequest:successHandler: NSURLRequest *req = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://d.hatena.ne.jp/h_mori/"]]; [NSURLConnection startConnectionWithRequest:req successHandler:^(NSURLConnection *con, NSURLResponse *res, NSData *data){ NSString *html = [[[NSString alloc] initWithData:data encoding:NSJapaneseEUCStringEncoding] autorelease]; NSLog(@"html=%@", html); } failureHandler:^(NSURLConnection *con, NSError *err){ NSLog(@"NSURLConnection failed : %@", [err localizedDescription]); }];
- 21. BlocksKitの便利メソッド UIWebView#didFinishLoadBlock UIWebView#didFinishWithErrorBlock UIWebView *webView = [[[UIWebView alloc] init] autorelease]; webView.didFinishLoadBlock = ^(UIWebView *v) { NSLog(@"didFinishLoadBlock"); }; webView.didFinishWithErrorBlock = ^(UIWebView *v, NSError *err) { NSLog(@"didFinishWithErrorBlock"); }; [webView.dynamicDelegate webViewDidFinishLoad:webView]; [webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://d.hatena.ne.jp/h_mori/"]]];
- 22. BlocksKitの便利メソッド MFMailComposeViewController#completionBlock MFMailComposeViewController *ctl = [[[MFMailComposeViewController alloc] init] autorelease]; ctl.mailComposeDelegate = self; ctl.completionBlock = ^(MFMailComposeViewController *controller, MFMailComposeResult result, NSError *err){ if (result == MFMailComposeResultSent) { //成功時の処理 } }; [self presentModalViewController:ctl animated:YES];
- 23. BlocksKitの便利メソッド UIControl#addEventHandler:forControlEvents: UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect]; button.frame = CGRectMake(40, 20, 240, 44); [button setTitle:@"Caption" forState:UIControlStateNormal]; [button addEventHandler:^(id sender) { //Action } forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:button];
- 24. BlocksKitの便利メソッド UIBarButtonItem#initWithBarButtonSystemItem:handler: self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel handler:^(id sender) { //Cancel Action }] autorelease];
- 25. BlocksKitの便利メソッド UIGestureRecognizer#initWithHandler: UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithHandler:^(UIGestureRecognizer *sender, UIGestureRecognizerState state, CGPoint location){ //Swipe Action }]; [self.view addGestureRecognizer:swipe];
- 26. BlocksKitの便利メソッド NSObject#performBlock: [NSObject performBlock:^(void) { NSLog(@"fire"); } afterDelay:1];
- 27. BlocksKitの便利メソッド NSTimer#scheduledTimerWithTimeInterval:block: [NSTimer scheduledTimerWithTimeInterval:1 block:^(NSTimeInterval time) { //action every 1 sec. } repeats:YES];
- 29. UITableViewの拡張 A2DynamicUITableViewDelegateの実装 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { id realDelegate = self.realDelegate; if (realDelegate && [realDelegate respondsToSelector:@selector(tableView:didSelectRowAtIndexPath:)]) { [realDelegate tableView:tableView didSelectRowAtIndexPath:indexPath]; } NSString *key = [NSString stringWithFormat:@”%@_%@_%@”, kHandlerDidSelectRow, indexPath.section, indexPath.row]; BKTableViewBlock block = [self.handlers objectForKey:key]; if (block) { ((BKTableViewBlock)block)(tableView, indexPath); } }
- 30. UITableViewの拡張 UITableView (BlocksKitExtends) - (id)initWithFrame:(CGRect)frame style:(UITableViewStyle)style delegate:(id)delegate dataSource:(id)dataSource { UITableView *tableView = [self initWithFrame:frame style:style]; tableView.delegate = self.dynamicDelegate; ((A2DynamicDelegate *)self.dynamicDelegate).realDelegate = delegate; tableView.dataSource = self.dynamicDataSource; ((A2DynamicDelegate *)self.dynamicDataSource).realDelegate = dataSource; return tableView; }
- 31. UITableViewの拡張 UITableView (BlocksKitExtends) typedef void (^BKTableViewBlock)(UITableView *tableView, NSIndexPath *indexPath); - (void)setHandler:(BKTableViewBlock)block forDidSelectRowAtIndexPath:(NSIndexPath *)indexPath { NSString *key = [NSString stringWithFormat:@”%@_%@_%@”, kHandlerDidSelectRow, indexPath.section, indexPath.row]; if (block) { [[self.dynamicDelegate handlers] setObject:block forKey:key]; } else { [[self.dynamicDelegate handlers] removeObjectForKey:key]; } [self setHandler:block forKey:key target:self.dynamicDelegate]; }
- 32. UITableViewの拡張 使い方 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@”Cell”]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:@”Cell”] autorelease]; } if (indexPath.section == 0) { cell.textLabel.text = [_rows objectAtIndex:indexPath.row]; [tableView setHandler:^(UITableView *tv, NSIndexPath *ip){ //Cell選択時の処理 } forDidSelectRowAtIndexPath:indexPath]; } return cell; }
- 33. UIViewControllerの基底拡張 UIViewControllerのView LifesycleでBlock差込を行う loadView: viewDidLoad: viewWillAppear: viewDidAppear: viewWillDisappear: viewDidDisappear:
- 34. UIViewControllerの基底拡張 BaseViewController void (^_viewWillAppearBlock)(BOOL); - (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; if (_viewWillAppearBlock) { _viewWillAppearBlock(animated); } }
- 35. UIViewControllerの基底拡張 画面の遷移管理に使える callback block for B viewWillAppear: B execute block from B A callback block for C viewWillAppear: C execute block from C 利点：B,CはAを意識する必要がない（疎結合になる）
- 37. ご清聴ありがとうございました m(_ _)m
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