本节书摘来自异步社区《iPad开发从入门到精通》一书中的第6章，第6.4节收藏历史，作者 杨春泽，更多章节内容可以访问云栖社区“异步社区”公众号查看
6.4 收藏历史iPad开发从入门到精通为了方便用户，特意提供了收藏历史功能，用户可以将经常用到的信息收藏起来，便于以后查询。主要包括如下3类收藏信息。收藏线路。收藏站点。收藏站站。CFavoriteView.xib的UI界面如图6-9所示，在上方显示了3个选项卡，在下方列表中显示了具体的收藏信息。
文件CFavoriteViewController.h的实现代码如下所示。
#import <UIKit/UIKit.h> enum ESegCtrlIndex { EFavorite_Line, EFavorite_Stat, EFavorite_StatToStat }segCtrlIndex; @interface CFavoriteViewController : UIViewController <UITableViewDelegate,UITableView DataSource>{ UITableView *favoriteTableView; UINavigationBar *favNavigationBar; UISegmentedControl *favoriteSegCtrl; NSInteger ESegType; } @property (nonatomic, retain) IBOutlet UITableView *favoriteTableView; @property (nonatomic, retain) IBOutlet UISegmentedControl *favoriteSegCtrl; @property (nonatomic, retain) IBOutlet UINavigationBar *favNavigationBar; -(IBAction)OnSegmentIndexChanged:(id)sender; @end 文件CFavoriteViewController.m是文件CFavoriteViewController.h的实现，分别实现了收藏线路、收藏站点和收藏站站的功能，并且还可以删除不需要的收藏信息。具体实现代码如下所示。 #import "CFavoriteViewController.h" #import "CDataContainer.h" #import "CBus_LineDetailViewController.h" #import "CBus_StationDetailViewController.h" @implementation CFavoriteViewController @synthesize favoriteTableView,favoriteSegCtrl,favNavigationBar; // 视图初始化 - (void)viewDidLoad { [super viewDidLoad]; ESegType = EFavorite_Line; UIBarButtonItem *editButton = [[UIBarButtonItem alloc] initWithTitle:@"Delete" style:UIBarButtonItemStyleBordered target:self action:@selector(toggleEdit:)]; self.navigationItem.rightBarButtonItem = editButton; [editButton release]; } -(IBAction)toggleEdit:(id)sender{ [self.favoriteTableView setEditing:!self.favoriteTableView.editing animated:YES]; if (self.favoriteTableView.editing){ [self.navigationItem.rightBarButtonItem setTitle:@"Done"]; } else{ [self.navigationItem.rightBarButtonItem setTitle:@"Delete"]; } } #pragma mark - #pragma mark View lifecycle - (void)viewWillAppear:(BOOL)animated{ [super viewWillAppear:animated]; [favoriteTableView reloadData]; NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults]; NSInteger styleNum = [userDefault integerForKey:@"styleType"]; switch (styleNum) { case 0:{ [UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleDefault; self.navigationController.navigationBar.barStyle = UIBarStyleDefault; self.favoriteSegCtrl.tintColor = [UIColor colorWithRed:0.48 green:0.56 blue:0.66 alpha:1.0]; self.favNavigationBar.barStyle = UIBarStyleDefault; break; } case 1:{ [UIApplication sharedApplication].statusBarStyle = UIStatusBarStyle BlackOpaque; self.navigationController.navigationBar.barStyle = UIBarStyleBlackOpaque; self.favoriteSegCtrl.tintColor = [UIColor darkGrayColor]; self.favNavigationBar.barStyle = UIBarStyleBlackOpaque; break; } } [favoriteTableView reloadData]; } #pragma mark - #pragma mark Table view data source - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section { if (ESegType == EFavorite_Line){ return @"收藏线路"; } else if(ESegType == EFavorite_Stat){ return @"收藏站点"; } else if(ESegType == EFavorite_StatToStat){ return @"收藏站站"; } return nil; } - (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section{ return 30; } - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { // Return the number of sections return 1; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { // Return the number of rows in the section if (ESegType == EFavorite_Line){ return [[CDataContainer Instance].favoriteLineNameArray count]; } else if(ESegType == EFavorite_Stat){ return [[CDataContainer Instance].favoriteStationNameArray count]; } else if(ESegType == EFavorite_StatToStat){ return [[CDataContainer Instance].favoriteStatToStatBeginNameArray count]; } return 0; } // 自定义单元格的外观 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease]; } cell.selectionStyle = UITableViewCellSelectionStyleGray; cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; // 配置单元格 if (ESegType == EFavorite_Line){ [[CDataContainer Instance] GetLineStationFromTableSequence: [[[CDataContainer Instance].favoriteLineIndexArray objectAtIndex:indexPath.row] intValue]]; NSString *beginStr = [[CDataContainer Instance].stationNameArray objectAtIndex:GetBusLineSequenceByIndex:0]-1]; NSString *endStr = [[CDataContainer Instance].stationNameArray objectAtIndex: [[CDataContainer Instance] GetBusLineSequenceBy Index:[[CDataContainer Instance].sequenceNumArray count]-1]-1]; NSString *detailStr = [[NSString alloc] initWithFormat:@"%@->%@",beginStr,endStr]; cell.detailTextLabel.font = [UIFont systemFontOfSize:12]; cell.detailTextLabel.text = detailStr; [detailStr release]; cell.imageView.image = [UIImage imageNamed:@"bus_table_line.png"]; cell.textLabel.text = [[CDataContainer Instance].favoriteLineNameArray objectAtIndex:indexPath.row]; } else if(ESegType == EFavorite_Stat){ cell.detailTextLabel.text = @""; cell.imageView.image = [UIImage imageNamed:@"bus_table_stat.png"]; cell.textLabel.text = [[CDataContainer Instance].favoriteStationNameArray objectAtIndex:indexPath.row]; } else if(ESegType == EFavorite_StatToStat){ cell.detailTextLabel.text = @""; cell.imageView.image = [UIImage imageNamed:@"bus_statTostat.png"]; NSString *beginStr = [[CDataContainer Instance].favoriteStatToStatBeginName Array objectAtIndex:indexPath.row]; NSString *endStr = [[CDataContainer Instance].favoriteStatToStatEndName Array objectAtIndex:indexPath.row]; NSString *detailStr= [[NSString alloc] initWithFormat:@"%@->%@",beginStr,endStr]; cell.textLabel.text = detailStr; [detailStr release]; } return cell; } // Override to support conditional editing of the table view. - (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath{ return YES; } // 优先支持编辑表视图 - (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditing Style)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath{ if (editingStyle == UITableViewCellEditingStyleDelete) { // 从数据源中删除行 if (ESegType == EFavorite_Line) { [[CDataContainer Instance] DeleteFavoriteInfoToDatabase:0 DeleteName: [[CDataContainer Instance].favoriteLineNameArray objectAtIndex:indexPath.row] DeteleNameEnd:nil]; [[CDataContainer Instance].favoriteLineNameArray removeObjectAtIndex: indexPath.row]; [[CDataContainer Instance].favoriteLineIndexArray removeObjectAtIndex: indexPath.row]; } else if(ESegType == EFavorite_Stat){ [[CDataContainer Instance] DeleteFavoriteInfoToDatabase:1 DeleteName:[[CDataContainer Instance].favoriteStationNameArray objectAtIndex: indexPath.row] DeteleNameEnd:nil]; [[CDataContainer Instance].favoriteStationNameArray removeObject AtIndex:indexPath.row]; [[CDataContainer Instance].favoriteStationIndexArray removeObject AtIndex:indexPath.row]; } else if(ESegType == EFavorite_StatToStat){ [[CDataContainer Instance] DeleteFavoriteInfoToDatabase:2 DeleteName: [[CDataContainer Instance].favoriteStatToStatBeginNameArray objectAtIndex:indexPath.row] DeteleNameEnd: [[CDataContainer Instance].favoriteStatToStatEndNameArray objectAtIndex:indexPath.row]]; [[CDataContainer Instance].favoriteStatToStatBeginNameArray remove ObjectAtIndex:indexPath.row]; [[CDataContainer Instance].favoriteStatToStatBeginIndexArray remove ObjectAtIndex:indexPath.row]; [[CDataContainer Instance].favoriteStatToStatEndNameArray remove ObjectAtIndex:indexPath.row]; [[CDataContainer Instance].favoriteStatToStatEndIndexArray remove ObjectAtIndex:indexPath.row]; } [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] with RowAnimation:UITableViewRowAnimationFade]; } else if (editingStyle == UITableViewCellEditingStyleInsert) { // 创建一个新实例的适当的类，将它插入到数组中，并添加一个新行表观 } } #pragma mark - #pragma mark Table view delegate - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { // 导航逻辑创造和推动另一个视图控制器 if (ESegType == EFavorite_Line){ CBus_LineDetailViewController *detailViewController = [[CBus_LineDetailView Controller alloc] initWithNibName:@"CBus_LineDetailView" bundle:nil]; detailViewController.currentLineIndex = [[[CDataContainer Instance]. favoriteLineIndexArray objectAtIndex:indexPath.row] intValue]; detailViewController.currentLineName = [[CDataContainer Instance]. favoriteLineNameArray objectAtIndex:indexPath.row]; [self.navigationController pushViewController:detailViewController animated:YES]; [detailViewController release]; } else if(ESegType == EFavorite_Stat){ CBus_StationDetailViewController *detailViewController = [[CBus_Station DetailViewController alloc] initWithNibName:@"CBus_StationDetailView" bundle:nil]; detailViewController.currentStationIndex = [[[CDataContainer Instance]. favoriteStationIndexArray objectAtIndex:indexPath.row] intValue]; detailViewController.currentStationName = [[CDataContainer Instance]. favoriteStationNameArray objectAtIndex:indexPath.row]; [self.navigationController pushViewController:detailViewController animated:YES]; [detailViewController release]; } else if(ESegType ==EFavorite_StatToStat){ CBus_StationDetailViewController *detailViewController = [[CBus_Station DetailViewController alloc] initWithNibName:@"CBus_StationDetailView" bundle:nil]; detailViewController.beginStationName = [[CDataContainer Instance]. favoriteStatToStatBeginNameArray objectAtIndex:indexPath.row]; detailViewController.beginStationIndex = [[[CDataContainer Instance]. favoriteStatToStatBeginIndexArray objectAtIndex:indexPath.row] intValue]; detailViewController.endStationName = [[CDataContainer Instance].favorite StatToStatEndNameArray objectAtIndex:indexPath.row]; detailViewController.endStationIndex = [[[CDataContainer Instance].favorite StatToStatEndIndexArray objectAtIndex:indexPath.row] intValue]; detailViewController.isStatToStat = YES; [self.navigationController pushViewController:detailViewController animated:YES]; [detailViewController release]; } } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation) interfaceOrientation { // Return YES for supported orientations return (interfaceOrientation == UIInterfaceOrientationPortrait); } -(IBAction)OnSegmentIndexChanged:(id)sender{ if ([sender selectedSegmentIndex] == 0){ ESegType = EFavorite_Line; } else if([sender selectedSegmentIndex] == 1){ ESegType = EFavorite_Stat; } else if([sender selectedSegmentIndex] == 2){ ESegType = EFavorite_StatToStat; } [favoriteTableView reloadData]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; } - (void)viewDidUnload { [super viewDidUnload]; // Release any retained subviews of the main view // e.g. self.myOutlet = nil; self.favoriteTableView = nil; } - (void)dealloc { [favoriteTableView release]; [favoriteSegCtrl release]; [favNavigationBar release]; [super dealloc]; } @end执行效果如图6-10所示。
相关资源：iPAD2从入门到精通