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 orientationsreturn (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 cellcell.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:selfcancelButtonTitle:@"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:selfcancelButtonTitle:@"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 sectionsreturn 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {// Return the number of rows in the sectionreturn [[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 cellcell.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 controllerif (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];
}