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6.3节站站查询，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
6.3 站站查询iPad开发从入门到精通本模块的功能是提供站站查询功能，只需输入起始站和目的站的名称，就可以快速查询到符合要求的公交线路了。在本节的内容中，将详细讲解站站查询模块的具体实现流程。
6.3.1 站站查询主视图站站查询主视图CBus_StatToStatView.xib的UI界面如图6-6所示，在上方显示搜索表单，下方列表显示了30条线路。
实现文件CBus_StatToStatViewController.h的代码如下所示。
#import <UIKit/UIKit.h> #define kBeginStationComponent 0 #define kEndStationComponent 1 enum EStationType{ EBeginStationType, EEndStationType, ENoneStationType }; @interface CBus_StatToStatViewController : UIViewController <UITableViewDelegate, UITableViewDataSource, UISearchDisplayDelegate, UISearchBarDelegate, UIPickerView Delegate, UIPickerViewDataSource>{ UITableView *busStatToStatTableView; UISearchBar *currentSearchBar; UISearchBar *beginSearchBar; UISearchBar *endSearchBar; UIPickerView *stationPickView; NSInteger currentBeginIndex; NSInteger currentEndIndex; NSInteger stationType; NSMutableArray *beginFilteredListContent; NSMutableArray *endFilteredListContent; NSString *ifSelectedPickerString; NSString *ifSelectedPickEndString; BOOL isSearchBegin; BOOL isSearchEndBegin; BOOL isJumpToStat; UIBarButtonItem *returnKeyBordBtn; } @property (nonatomic, retain) IBOutlet UITableView *busStatToStatTableView; @property (nonatomic, retain) IBOutlet UISearchBar *beginSearchBar; @property (nonatomic, retain) IBOutlet UISearchBar *endSearchBar; @property (nonatomic, retain) IBOutlet UIPickerView *stationPickView; @property(nonatomic, retain) NSMutableArray *beginFilteredListContent; @property(nonatomic, retain) NSMutableArray *endFilteredListContent; @property(nonatomic) BOOL isJumpToStat; - (void)filterContentForSearchText:(NSString*)searchText; @end 文件CBus_StatToStatViewController.m是文件CBus_StatToStatViewController.h的实现，功能是显示搜索表单，根据用户输入的起始站点和终点站信息，列表显示符合搜索条件的线路。 #import "CBus_StatToStatViewController.h" #import "CBus_LineDetailViewController.h" #import "CBus_StationDetailViewController.h" #import "CDataContainer.h" @implementation CBus_StatToStatViewController @synthesize busStatToStatTableView,beginFilteredListContent,endFilteredListContent; @synthesize beginSearchBar, endSearchBar, stationPickView; @synthesize isJumpToStat; // 界面初始化 - (void)viewDidLoad { [super viewDidLoad]; returnKeyBordBtn = [[UIBarButtonItem alloc] initWithTitle:@"收起键盘" style:UIBarButtonItemStylePlain target:self action:@selector(HideKeyBoard:)]; self.navigationItem.rightBarButtonItem = nil;// 输入键盘; self.beginFilteredListContent = [NSMutableArray arrayWithArray:[CDataContainer Instance].stationNameArray]; self.endFilteredListContent = [NSMutableArray arrayWithArray:[CDataContainer Instance].stationNameArray]; isSearchBegin = NO; isSearchEndBegin = NO; isJumpToStat = NO; ifSelectedPickerString = [[NSString alloc] init]; ifSelectedPickEndString = [[NSString alloc] init]; } #pragma mark - #pragma mark View lifecycle //根据设置的样式显示 - (void)viewWillAppear:(BOOL)animated{ [super viewWillAppear:animated]; [self.busStatToStatTableView reloadData]; NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults]; NSInteger styleNum = [userDefault integerForKey:@"styleType"]; switch (styleNum){ case 0:{ [UIApplication sharedApplication].statusBarStyle = UIStatusBarStyle Default; self.navigationController.navigationBar.barStyle = UIBarStyleDefault; self.beginSearchBar.barStyle = UIBarStyleDefault; self.endSearchBar.barStyle = UIBarStyleDefault; break; } case 1:{ [UIApplication sharedApplication].statusBarStyle = UIStatusBarStyle BlackOpaque; self.navigationController.navigationBar.barStyle = UIBarStyleBlackOpaque; self.beginSearchBar.barStyle = UIBarStyleBlackOpaque; self.endSearchBar.barStyle = UIBarStyleBlackOpaque; break; } } self.navigationItem.rightBarButtonItem = nil; stationType = ENoneStationType; [stationPickView reloadAllComponents]; if(isJumpToStat){ CBus_StationDetailViewController *detailViewController = [[CBus_Station DetailViewController alloc] initWithNibName:@"CBus_StationDetailView" bundle:nil]; detailViewController.currentStationName = [[CDataContainer Instance].stationNameArray objectAtIndex:currentBeginIndex]; detailViewController.currentStationIndex = currentBeginIndex+1; [self.navigationController pushViewController:detailViewController animated:YES]; [detailViewController release]; isJumpToStat = NO; } } - (void)viewDidAppear:(BOOL)animated{ [super viewDidAppear:animated]; } - (void)viewWillDisappear:(BOOL)animated{ [super viewWillDisappear:animated]; } - (void)viewDidDisappear:(BOOL)animated{ [super viewDidDisappear:animated]; beginSearchBar.text = @""; endSearchBar.text = @""; } // 默认图片 - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation) interfaceOrientation{ // Return YES for supported orientations return (interfaceOrientation == UIInterfaceOrientationPortrait); } -(IBAction)HideKeyBoard:(id)sender{ NSLog(@"------HideKeyBoard------"); self.navigationItem.rightBarButtonItem = nil; beginSearchBar.text = @""; endSearchBar.text = @""; stationPickView.hidden = YES; [currentSearchBar resignFirstResponder]; } #pragma mark - #pragma mark Table view data source - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger) section{ return @"站站查询"; } - (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger) section{ return 30; } - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{ return 1; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{ return [[CDataContainer Instance].stationNameArray count]; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; } cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; cell.selectionStyle = UITableViewCellSelectionStyleGray; // Configure the cell cell.textLabel.text = [[CDataContainer Instance].stationNameArray objectAtIndex: indexPath.row]; cell.imageView.image = [UIImage imageNamed:@"bus_table_stat.png"]; return cell; } #pragma mark - #pragma mark Table view delegate - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { // 创造和推动另一个视图控制器 CBus_StationDetailViewController *detailViewController = [[CBus_StationDetail ViewController alloc] initWithNibName:@"CBus_StationDetailView" bundle:nil]; detailViewController.currentStationName = [[CDataContainer Instance].stationName Array objectAtIndex:indexPath.row]; detailViewController.currentStationIndex = indexPath.row+1; [self.navigationController pushViewController:detailViewController animated:YES]; [detailViewController release]; } -(void)tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath: (NSIndexPath *)indexPath { } #pragma mark - #pragma mark Picker view data source - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{ return 2; } - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger) component{ if (component == kBeginStationComponent){ if ([beginSearchBar.text isEqualToString:@""]){ return [[CDataContainer Instance].stationNameArray count]; } if (stationType == EBeginStationType){ return[beginFilteredListContent count]; } else{ return [[CDataContainer Instance].stationNameArray count]; } } else if(component == kEndStationComponent){ if ([endSearchBar.text isEqualToString:@""]){ return [[CDataContainer Instance].stationNameArray count]; } if (stationType == EEndStationType){ return[endFilteredListContent count]; } else { return [[CDataContainer Instance].stationNameArray count]; } } return 0; } - (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{ if (component == kBeginStationComponent){ if ([beginSearchBar.text isEqualToString:@""]){ return [[CDataContainer Instance].stationNameArray objectAtIndex:row]; } if (stationType == EBeginStationType){ return[beginFilteredListContent objectAtIndex:row]; } else { return [[CDataContainer Instance].stationNameArray objectAtIndex:row]; } } else if(component == kEndStationComponent){ if ([endSearchBar.text isEqualToString:@""]){ return [[CDataContainer Instance].stationNameArray objectAtIndex:row]; } if (stationType == EEndStationType){ return[endFilteredListContent objectAtIndex:row]; } else { return [[CDataContainer Instance].stationNameArray objectAtIndex:row]; } } return nil; } - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent: (NSInteger)component{ if (component == kBeginStationComponent){ currentBeginIndex = row; if ([beginSearchBar.text isEqualToString:@""]){ isSearchBegin = NO; ifSelectedPickerString = [[CDataContainer Instance].stationNameArray objectAtIndex:row]; beginSearchBar.text = [[CDataContainer Instance].stationNameArray objectAtIndex:row]; } else if (stationType == EBeginStationType){ ifSelectedPickerString = [beginFilteredListContent objectAtIndex:row]; beginSearchBar.text = [beginFilteredListContent objectAtIndex:row]; } else { ifSelectedPickerString = [[CDataContainer Instance].stationNameArray objectAtIndex:row]; beginSearchBar.text = [[CDataContainer Instance].stationNameArray objectAtIndex:row]; } } else if(component == kEndStationComponent){ currentEndIndex = row; if ([endSearchBar.text isEqualToString:@""]){ isSearchEndBegin = NO; ifSelectedPickEndString = [[CDataContainer Instance].stationNameArray objectAtIndex:row]; endSearchBar.text = [[CDataContainer Instance].stationNameArray object AtIndex:row]; } else if (stationType == EEndStationType){ ifSelectedPickEndString = [endFilteredListContent objectAtIndex:row]; endSearchBar.text = [endFilteredListContent objectAtIndex:row]; } else{ ifSelectedPickEndString = [[CDataContainer Instance].stationNameArray objectAtIndex:row]; endSearchBar.text = [[CDataContainer Instance].stationNameArray object AtIndex:row]; } } } #pragma mark - #pragma mark SearchBarText delegate - (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar{ NSLog(@"------searchBarTextDidBeginEditing---"); stationPickView.hidden = NO; self.navigationItem.rightBarButtonItem = returnKeyBordBtn; currentSearchBar = searchBar; if (currentSearchBar == beginSearchBar){ NSLog(@"---------Type------EBeginStationType"); stationType = EBeginStationType; } else{ NSLog(@"---------Type------EEndStationType"); stationType = EEndStationType; } } - (void)searchBarTextDidEndEditing:(UISearchBar *)searchBar{ NSLog(@"------searchBarTextDidEndEditing---"); } - (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText{ NSLog(@"--------SearchBar_text Changed--------"); if(searchBar == beginSearchBar) { if ([ifSelectedPickerString isEqualToString:searchText]){ return; } if (stationType == EBeginStationType){ isSearchBegin = YES; [self filterContentForSearchText:searchText]; [stationPickView reloadAllComponents]; } } else if(searchBar == endSearchBar){ if ([ifSelectedPickEndString isEqualToString:searchText]){ return; } if (stationType == EEndStationType){ isSearchEndBegin = YES; [self filterContentForSearchText:searchText]; [stationPickView reloadAllComponents]; } } } - (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar{ NSLog(@"------searchBarSearchButtonClicked---"); CBus_StationDetailViewController *detailViewController = [[CBus_StationDetail ViewController alloc] initWithNibName:@"CBus_StationDetailView" bundle:nil]; if ((![beginSearchBar.text isEqualToString:@""])&&(![endSearchBar.text isEqual ToString:@""])){ NSLog(@"------站站查询------"); if (isSearchBegin){ detailViewController.beginStationName = [beginFilteredListContent objectAtIndex:currentBeginIndex]; detailViewController.beginStationIndex = [[CDataContainer Instance]. stationNameArray indexOfObject:[beginFilteredListContent objectAtIndex:currentBeginIndex]]+1; } else { detailViewController.beginStationName = [[CDataContainer Instance]. stationNameArray objectAtIndex:currentBeginIndex]; detailViewController.beginStationIndex = currentBeginIndex+1; } if (isSearchEndBegin){ detailViewController.endStationName = [endFilteredListContent object AtIndex:currentEndIndex]; detailViewController.endStationIndex = [[CDataContainer Instance]. stationNameArray indexOfObject:[endFilteredListContent objectAtIndex:currentEndIndex]]+1; } else { detailViewController.endStationName = [[CDataContainer Instance]. stationNameArray objectAtIndex:currentEndIndex]; detailViewController.endStationIndex = currentEndIndex+1; } detailViewController.isStatToStat = YES; } else if (stationType == EBeginStationType){ NSLog(@"------始站查询------"); if (isSearchBegin){ detailViewController.currentStationName = [beginFilteredListContent objectAtIndex:currentBeginIndex]; detailViewController.currentStationIndex = [[CDataContainer Instance]. stationNameArray indexOfObject:[beginFilteredListContent objectAtIndex:currentBeginIndex]]+1; } else { detailViewController.currentStationName = [[CDataContainer Instance]. stationNameArray objectAtIndex:currentBeginIndex]; detailViewController.currentStationIndex = currentBeginIndex+1; } detailViewController.isStatToStat = NO; } else if(stationType == EEndStationType){ NSLog(@"------尾站查询------"); if (isSearchEndBegin){ detailViewController.currentStationName = [endFilteredListContent objectAtIndex:currentEndIndex]; detailViewController.currentStationIndex = [[CDataContainer Instance]. stationNameArray indexOfObject:[endFilteredListContent objectAtIndex:currentEndIndex]]+1; } else{ detailViewController.currentStationName = [[CDataContainer Instance]. stationNameArray objectAtIndex:currentEndIndex]; detailViewController.currentStationIndex = currentEndIndex+1; } detailViewController.isStatToStat = NO; } [currentSearchBar resignFirstResponder]; stationPickView.hidden = YES; // 通过选定的对象到新视图控制器 [self.navigationController pushViewController:detailViewController animated:YES]; [detailViewController release]; } #pragma mark - #pragma mark Search Methods - (void)filterContentForSearchText:(NSString*)searchText;{ //基于搜索文本和范围更新过滤阵列 //首先清除过滤数组 if (stationType == EBeginStationType){ [self.beginFilteredListContent removeAllObjects]; for (int i = 0; i < [[CDataContainer Instance].stationNameArray count]; i++){ NSString *searchNameInfo = [[CDataContainer Instance].stationNameArray objectAtIndex:i]; NSString *searchPYInfo = [[CDataContainer Instance].stationPYArray objectAtIndex:i]; NSComparisonResult result = [searchNameInfo compare:searchText options: (NSCaseInsensitiveSearch|NSDiacriticInsensitiveSearch) range:NSMakeRange(0, [searchText length])]; NSComparisonResult resultPY = [searchPYInfo compare:searchText options: (NSCaseInsensitiveSearch|NSDiacriticInsensitiveSearch) range:NSMakeRange(0, [searchText length])]; if (result == NSOrderedSame || resultPY == NSOrderedSame){ [self.beginFilteredListContent addObject:searchNameInfo]; } } } else if(stationType == EEndStationType){ [self.endFilteredListContent removeAllObjects]; for (int i = 0; i < [[CDataContainer Instance].stationNameArray count]; i++){ NSString *searchNameInfo = [[CDataContainer Instance].stationNameArray objectAtIndex:i]; NSString *searchPYInfo = [[CDataContainer Instance].stationPYArray objectAtIndex:i]; NSComparisonResult result = [searchNameInfo compare:searchText options: (NSCaseInsensitiveSearch|NSDiacriticInsensitiveSearch) range:NSMakeRange(0, [searchText length])]; NSComparisonResult resultPY = [searchPYInfo compare:searchText options: (NSCaseInsensitiveSearch|NSDiacriticInsensitiveSearch) range:NSMakeRange(0, [searchText length])]; if (result == NSOrderedSame || resultPY == NSOrderedSame){ [self.endFilteredListContent addObject:searchNameInfo]; } } } } - (void)dealloc { [busStatToStatTableView release]; [beginSearchBar release]; [endSearchBar release]; [currentSearchBar release]; [stationPickView release]; [beginFilteredListContent release]; [endFilteredListContent release]; [returnKeyBordBtn release]; [super dealloc]; } @end执行效果如图6-7所示。
6.3.2 站站查询详情视图站站查询详情视图CBus_StatDetailStatView.xib的UI界面如图6-8所示，在上方显示票价、始发站、终点站、首班车时间和末班车时间，在下方列表显示了30条线路。
其实本模块和上一节中的线路详情模块类似，实现文件CBus_StatDetailStatViewController.m的主要代码如下所示。
#import "CBus_StatDetailStatViewController.h" #import "CBus_StationDetailViewController.h" #import "CBus_LineDetailLineViewController.h" #import "CDataContainer.h" @implementation CBus_StatDetailStatViewController @synthesize busLineDetailTableView,currentLineName; @synthesize currentLineIndex; @synthesize isStatToStat; // 视图初始化 - (void)viewDidLoad{ [super viewDidLoad]; self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithBar ButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(AddLineToFavorite)]; [[CDataContainer Instance] GetLineStationFromTableSequence:currentLineIndex]; } #pragma mark - #pragma mark View lifecycle - (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; [self.busLineDetailTableView reloadData]; NSLog(@"-----Nav----%@",self.navigationController.viewControllers); NSUserDefaults *userDefault = [NSUserDefaults standardUserDefaults]; NSInteger styleNum = [userDefault integerForKey:@"styleType"]; switch (styleNum) { case 0:{ [UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleDefault; self.navigationController.navigationBar.barStyle = UIBarStyleDefault; self.searchDisplayController.searchBar.barStyle = UIBarStyleDefault; break; } case 1:{ [UIApplication sharedApplication].statusBarStyle = UIStatusBarStyle BlackOpaque; self.navigationController.navigationBar.barStyle = UIBarStyleBlackOpaque; self.searchDisplayController.searchBar.barStyle = UIBarStyleBlackOpaque; break; } } } - (void)viewDidDisappear:(BOOL)animated { [super viewDidDisappear:animated]; isStatToStat = NO; } -(void)AddLineToFavorite{ NSLog(@"-------addLineToFavorite---------%@---%d",currentLineName,currentLineIndex); for(NSString *lineName in [CDataContainer Instance].favoriteLineNameArray){ if ([lineName isEqualToString:currentLineName]) { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"收藏" message:[NSString stringWithFormat:@"%@ 已收藏",currentLineName] delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil]; [alert show]; [alert release]; return; } } [[CDataContainer Instance] InsertFavoriteInfoToDatabase:0 AddName:currentLine Name AddIndex:currentLineIndex AddNameEnd:nil AddIndexEnd:0]; UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"收藏" message:[NSString stringWithFormat:@"收藏 %@ 成功",currentLineName] delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil]; [alert show]; [alert release]; } #pragma mark - #pragma mark Table view data source - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section{ return currentLineName; } - (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 return [[CDataContainer Instance].sequenceNumArray count]; } // Customize the appearance of table view cells. - (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; // Configure the cell cell.textLabel.text = [[CDataContainer Instance].stationNameArray objectAtIndex: [[CDataContainer Instance] GetBusLineSequenceByIndex:indexPath.row]-1]; cell.imageView.image = [UIImage imageNamed:@"bus_table_stat.png"]; return cell; } #pragma mark - #pragma mark Table view delegate - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{ // Navigation logic may go here. Create and push another view controller if (isStatToStat) { return; } CBus_StationDetailViewController *statDetailViewController = [self.navigation Controller.viewControllers objectAtIndex:1]; statDetailViewController.currentStationName = [[CDataContainer Instance].station NameArray objectAtIndex:[[CDataContainer Instance] GetBusLineSequenceByIndex:indexPath.row]-1]; statDetailViewController.currentStationIndex = [[CDataContainer Instance].station NameArray indexOfObject:statDetailViewController.currentStationName]+1; [self.navigationController popViewControllerAnimated:YES]; } 相关资源：敏捷开发V1.0.pptx