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。
