iOS开发：一个高仿美团的团购ipad客户端的设计和实现（功能：根据拼音进行检索并展示数据，离线缓存团购数据，浏览记录与收藏记录的批量删除等）

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大致花了一个月时间，利用各种空闲时间，将这个客户端实现了，在这里主要是想记录下，设计的大体思路以及实现过程中遇到的坑......

这个项目的github地址：https://github.com/wzpziyi1/GroupPurchase

主要实现的功能，用UICollectionViewController展示团购数据，根据拼音进行检索并展示数据，离线缓存团购数据，浏览记录与收藏记录的批量删除，友盟分享的集成，利用UIView+AutoLayout写布局，实现地图定位、自定义大头针等

整个项目，按功能分，有六个大的模块，每个模块里面都有各自的MVC，在各个MVC里面，再按照功能的不同，新建一下文件夹，存放实现统一功能的文件。

除此之外，还有一个Main模块，里面的Lib意为Library，放一些实现此客户端所需要用到的第三方库。Category文件夹里面，放整个项目各个地方都有可能需要用到的分类；Controller里面，放上一些最主要功能的ViewController，比如，自定义的NavigationController和TabBarController，那么整个项目的Navigation或者TabBarController都是可以根据需要继承自自定义的NavigationController，这里，我放的是：

后续，Home（首页）界面的viewController和Search（搜索）界面的viewController都是继承自ZYDealViewController的，Collect（收藏的团购记录）和Browse（浏览的团购记录）界面的viewController都是继承自ZYOldDealViewController，整个项目多个地方用到，所以我放在了这里。

Other文件夹里面，我放的是一些杂七杂八的文件，比如说appDelegate等。Tool文件夹里面，我放的是一些工具类文件.

其中，Tool和Category里面的文件不要和他类耦合，因为这些东西，我们写好一次之后，基本上是可以拖到下个项目直接使用的。

Home界面

如图：

在联网情况下，默认进来就是广州的所有团购信息，支持上拉、下拉刷新，已经适配好横竖屏。除此之外，还设置了当前地区、分类条件下，所有的团购信息都已经加载完毕了，那么将不可以进行上拉刷新操作（因为所有团购信息加载完毕，已经没有数据可以加载，那么应该要隐藏footer），默认是一次刷新10条团购信息。

除此之外，如果在当前条件下，如果没有团购信息，那么我显示的是一张提示图片：

下面这两个弹框是一样的，当初第一次写的时候，是分别写了两个popViewController，后面在进行优化的时候，发现是可以写成一个通用的双表，这样就进行了一系列的优化，使得以后遇到类似的双表界面，直接将我写好的类拖过去，就可以继续使用了，图片如下：

这是ZYHomeDropdown类，代码如下：

#import <UIKit/UIKit.h>@class ZYHomeDropdown;@protocol ZYHomeDropdownDataSource <NSObject>
/**
* 左边表格一共有多少行
*/
- (NSUInteger)numberOfRowsInMainTable:(ZYHomeDropdown *)homeDropdown;/**
* 左边表格每一行的标题
*
*/
- (NSString *)homeDropdown:(ZYHomeDropdown *)homeDropdown titleForRowInMainTable:(NSUInteger)row;/**
* 左边表格每一行的子数据
*
*/
- (NSArray *)homeDropdown:(ZYHomeDropdown *)homeDropdown subDataForRowInMainTable:(NSUInteger)row;@optional
/**
* 左边表格每一行的图标
*
*/
- (NSString *)homeDropdown:(ZYHomeDropdown *)homeDropdown normalIconForRowInMainTable:(NSUInteger)row;/**
* 左边表格每一行的选中图标
*
*/
- (NSString *)homeDropdown:(ZYHomeDropdown *)homeDropdown selectedIconForRowInMainTable:(NSUInteger)row;
@end@protocol ZYHomeDropdownDelegate <NSObject>
- (void)homeDropdown:(ZYHomeDropdown *)homeDropdown didSelectedRowInMainTable:(int)row;- (void)homeDropdown:(ZYHomeDropdown *)homeDropdown didSelectedRowInSubTable:(int)subRow mainRow:(int)mainRow;
@end@interface ZYHomeDropdown : UIView
@property (nonatomic, weak) id<ZYHomeDropdownDataSource>dataSource;
@property (nonatomic, weak) id<ZYHomeDropdownDelegate>delegate;+ (instancetype)homeDropdown;
@end#import "ZYHomeDropdown.h"
#import "ZYHomeMainCell.h"
#import "ZYHomeSubCell.h"
@interface ZYHomeDropdown () <UITableViewDelegate, UITableViewDataSource>
@property (weak, nonatomic) IBOutlet UITableView *mainTableView;
@property (weak, nonatomic) IBOutlet UITableView *subTableview;
//主表中被选的cell的row
@property (nonatomic, assign) int selectedMainRow;
@end@implementation ZYHomeDropdown+ (instancetype)homeDropdown
{
return [[self alloc] init];
}- (instancetype)init
{
if (self = [super init]) {
self = [[[NSBundle mainBundle] loadNibNamed:@"ZYHomeDropdown" owner:nil options:nil] lastObject];
[self commitInit];
}
return self;
}- (void)commitInit
{
self.mainTableView.delegate = self;
self.mainTableView.dataSource = self; self.subTableview.delegate = self;
self.subTableview.dataSource = self;
}- (void)awakeFromNib
{
self.autoresizingMask = UIViewAutoresizingNone;
}#pragma mark ----UITableViewDataSource
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if (self.mainTableView == tableView) {
return [self.dataSource numberOfRowsInMainTable:self];
}
else{
return [self.dataSource homeDropdown:self subDataForRowInMainTable:self.selectedMainRow].count;
}
}- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (tableView == self.mainTableView) {
ZYHomeMainCell *cell = [ZYHomeMainCell mainCellWithTableView:tableView];
cell.textLabel.text = [self.dataSource homeDropdown:self titleForRowInMainTable:indexPath.row]; if ([self.dataSource respondsToSelector:@selector(homeDropdown:normalIconForRowInMainTable:)]) { cell.imageView.image = [UIImage imageNamed:[self.dataSource homeDropdown:self normalIconForRowInMainTable:indexPath.row]];
} if ([self.dataSource respondsToSelector:@selector(homeDropdown:selectedIconForRowInMainTable:)]) { cell.imageView.highlightedImage = [UIImage imageNamed:[self.dataSource homeDropdown:self selectedIconForRowInMainTable:indexPath.row]];
} NSArray *subData = [self.dataSource homeDropdown:self subDataForRowInMainTable:indexPath.row]; if (subData.count) {
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
}
else{
cell.accessoryType = UITableViewCellAccessoryNone;
} return cell;
}
else{
ZYHomeSubCell *cell = [ZYHomeSubCell subCellWithTableView:tableView]; NSArray *subData = [self.dataSource homeDropdown:self subDataForRowInMainTable:self.selectedMainRow]; cell.textLabel.text = subData[indexPath.row]; return cell;
}
}#pragma mark ----UITabelViewDelegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
if (tableView == self.mainTableView) {
self.selectedMainRow = (int)indexPath.row;
[self.subTableview reloadData]; if ([self.delegate respondsToSelector:@selector(homeDropdown:didSelectedRowInMainTable:)]) {
[self.delegate homeDropdown:self didSelectedRowInMainTable:(int)indexPath.row];
}
}
else{
if ([self.delegate respondsToSelector:@selector(homeDropdown:didSelectedRowInSubTable:mainRow:)]) {
[self.delegate homeDropdown:self didSelectedRowInSubTable:(int)indexPath.row mainRow:self.selectedMainRow];
}
}
}
@end

上面代码是大概实现思路，在具体实现里面，还有一个xib文件，以及mainCell和subCell。

下面是搜索的图片，实际上，搜索实现很简单，按照拼音或者关键字来检索下，如果符合条件，就放到数组里面，最后刷新tableView即可：

另外，跨控制进行数据交换，最好是使用Notification

首页还存在这样一个界面：

也就是菜单界面，动态展示了一些模块，五角星代表这需要展示收藏模块，圆代表着展示浏览记录模块，另外两个并未实现具体功能。

实现这样一个动态的菜单，我使用的是AwesomeMenu这个第三方库，具体实现可以见它github上的示例，项目中实现菜单的具体代码：

- (void)setupAwesomeMenu
{
//initWithImage放背景图片，normal和highlighted状态下的背景图片
//contentImage放具体要显示的图片
AwesomeMenuItem *midItem = [[AwesomeMenuItem alloc] initWithImage:[UIImage imageNamed:@"icon_pathMenu_background_highlighted"] highlightedImage:nil ContentImage:[UIImage imageNamed:@"icon_pathMenu_mainMine_normal"] highlightedContentImage:nil]; AwesomeMenuItem *firstItem = [[AwesomeMenuItem alloc] initWithImage:[UIImage imageNamed:@"bg_pathMenu_black_normal"] highlightedImage:nil ContentImage:[UIImage imageNamed:@"icon_pathMenu_collect_normal"] highlightedContentImage:[UIImage imageNamed:@"icon_pathMenu_collect_highlighted"]];
AwesomeMenuItem *secoendItem = [[AwesomeMenuItem alloc] initWithImage:[UIImage imageNamed:@"bg_pathMenu_black_normal"] highlightedImage:nil ContentImage:[UIImage imageNamed:@"icon_pathMenu_scan_normal"] highlightedContentImage:[UIImage imageNamed:@"icon_pathMenu_scan_highlighted"]];
AwesomeMenuItem *thirdItem = [[AwesomeMenuItem alloc] initWithImage:[UIImage imageNamed:@"bg_pathMenu_black_normal"] highlightedImage:nil ContentImage:[UIImage imageNamed:@"icon_pathMenu_more_normal"] highlightedContentImage:[UIImage imageNamed:@"icon_pathMenu_more_highlighted"]];
AwesomeMenuItem *fourthItem = [[AwesomeMenuItem alloc] initWithImage:[UIImage imageNamed:@"bg_pathMenu_black_normal"] highlightedImage:nil ContentImage:[UIImage imageNamed:@"icon_pathMenu_collect_normal"] highlightedContentImage:[UIImage imageNamed:@"icon_pathMenu_collect_highlighted"]]; NSArray *items = @[firstItem, secoendItem, thirdItem, fourthItem];
AwesomeMenu *awesome = [[AwesomeMenu alloc] initWithFrame:CGRectZero startItem:midItem optionMenus:items];
//开始点
awesome.startPoint = CGPointMake(50, 150);
//设置显示区域（也就是角度）
awesome.menuWholeAngle = M_PI_2; awesome.delegate = self;
//让中间按钮不旋转
awesome.rotateAddButton = NO;
awesome.alpha = 0.5;
[self.view addSubview:awesome]; [awesome autoPinEdgeToSuperviewEdge:ALEdgeLeft withInset:0];
[awesome autoPinEdgeToSuperviewEdge:ALEdgeBottom withInset:0]; [awesome autoSetDimensionsToSize:CGSizeMake(200, 200)];
}

前面提到，Home模块的vc和Search模块的vc(viewController)是继承自ZYDealViewController，在ZYDealViewController我处理了home模块和search模块的相同功能，它们各自的特殊功能是放到各自的vc里面实现的，ZYDealViewController的代码如下：

#import <UIKit/UIKit.h>@interface ZYDealViewController : UICollectionViewController
/** 设置请求参数:交给子类去实现 */
- (void)setParams:(NSMutableDictionary *)params;
@end#import "ZYDealViewController.h"
#import "ZYConst.h"
#import "UIBarButtonItem+ZYExtension.h"
#import "UIView+Extension.h"
#import "ZYHomeTopItem.h"
#import "ZYCategoryViewController.h"
#import "ZYDistrictViewController.h"
#import "ZYSort.h"
#import "ZYCity.h"
#import "ZYMetaTool.h"
#import "ZYSortViewController.h"
#import "ZYRegion.h"
#import "ZYCategory.h"
#import "DPAPI.h"
#import "ZYDeal.h"
#import "MJExtension.h"
#import "ZYDealCell.h"
#import "MJRefresh.h"
#import "MBProgressHUD+MJ.h"
#import "UIView+AutoLayout.h"
#import "ZYDetailViewController.h"@interface ZYDealViewController () <DPRequestDelegate>@property (nonatomic, strong) NSMutableArray *deals;@property (nonatomic, strong) DPRequest *lastRequest;@property (nonatomic, assign) int currentPage;@property (nonatomic, assign) int totalCount;/** 当没有团购数据时，显示一张没有数据的背景 */
@property (nonatomic, strong) UIImageView *backgroundImageView;@end@implementation ZYDealViewControllerstatic NSString * const reuseIdentifier = @"ZYDealViewControllerCell";- (UIImageView *)backgroundImageView
{
if (!_backgroundImageView) {
_backgroundImageView = [[UIImageView alloc] init];
_backgroundImageView.image = [UIImage imageNamed:@"icon_deals_empty"];
[self.view addSubview:_backgroundImageView];
[_backgroundImageView autoCenterInSuperview]; }
return _backgroundImageView;
}- (NSMutableArray *)deals
{
if (!_deals) {
_deals = [NSMutableArray array];
}
return _deals;
}- (instancetype)init
{
UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init]; //设置cell的大小
layout.itemSize = CGSizeMake(305, 305);
return [self initWithCollectionViewLayout:layout];
}/**
当屏幕旋转,控制器view的尺寸发生改变调用
*/
- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
{
// 根据屏幕宽度决定列数
int cols = (size.width == 1024) ? 3 : 2;
// 根据列数计算内边距
UICollectionViewFlowLayout *layout = (UICollectionViewFlowLayout *)self.collectionViewLayout;
CGFloat inset = (size.width - cols * layout.itemSize.width) / (cols + 1);
layout.sectionInset = UIEdgeInsetsMake(inset, inset, inset, inset);
// 设置每一行之间的间距
layout.minimumLineSpacing = inset;
}- (void)viewDidLoad {
[super viewDidLoad]; [self setupCollection];}#pragma mark ----setup系列- (void)setupCollection
{
[self.collectionView registerNib:[UINib nibWithNibName:@"ZYDealCell" bundle:nil] forCellWithReuseIdentifier:reuseIdentifier]; self.collectionView.backgroundColor = ZYGlobalBg;
self.collectionView.alwaysBounceVertical = YES;
self.collectionView.header = [MJRefreshNormalHeader headerWithRefreshingTarget:self refreshingAction:@selector(heaerRefresh)];
self.collectionView.footer = [MJRefreshAutoNormalFooter footerWithRefreshingTarget:self refreshingAction:@selector(footerRefresh)];
}#pragma mark ----与服务器进行交互
- (void)loadNewDeals
{
DPAPI *api = [[DPAPI alloc] init];
NSMutableDictionary *params = [NSMutableDictionary dictionary];
//让子类自行设置响应的参数
[self setParams:params];
params[@"page"] = @(self.currentPage);
// 每页的条数
params[@"limit"] = @10;
self.lastRequest = [api requestWithURL:@"v1/deal/find_deals" params:params delegate:self]; // NSLog(@"请求参数:%@", params);
}- (void)loadDeals
{
self.currentPage = 1;
[self loadNewDeals];
}- (void)loadMoreDeals
{
self.currentPage++;
[self loadNewDeals];
}- (void)request:(DPRequest *)request didFinishLoadingWithResult:(id)result
{
if (request != self.lastRequest) { //如果不是同一个请求，是短时间内发了两次请求，那么只要最近的一次请求
return;
}
self.totalCount = [result[@"total_count"] intValue]; NSArray *newDeals = [ZYDeal objectArrayWithKeyValuesArray:result[@"deals"]];
if (self.currentPage == 1) {
[self.deals removeAllObjects];
} [self.deals addObjectsFromArray:newDeals]; [self.collectionView reloadData]; [self.collectionView.footer endRefreshing];
[self.collectionView.header endRefreshing];
}- (void)request:(DPRequest *)request didFailWithError:(NSError *)error
{
if (self.lastRequest != request) {
return;
}
//在ipad开发中，如果要显示HUD，特别需要注意，显示到self.view上
// [MBProgressHUD showError:@"加载失败，请检查您的网络..."]; [MBProgressHUD showError:@"加载失败，请检查您的网络..." toView:self.view]; [self.collectionView.footer endRefreshing]; //当不是请求第一页的时候，如果请求失败，那么应当减去这次请求的
self.currentPage--; [self.collectionView.footer endRefreshing];
[self.collectionView.header endRefreshing];
}#pragma mark ----刷新方法- (void)heaerRefresh
{
[self loadDeals];
}- (void)footerRefresh
{
[self loadMoreDeals];
}
#pragma mark <UICollectionViewDataSource>- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView { return 1;
}- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
//需要在请求发送就设置以此cell的布局
[self viewWillTransitionToSize:CGSizeMake(self.collectionView.width, self.collectionView.height) withTransitionCoordinator:nil];
self.backgroundImageView.hidden = (self.deals.count != 0);
return self.deals.count;
}- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
ZYDealCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath];
cell.deal = self.deals[indexPath.row]; //第一次进入界面，self.totalCount会被初始化为0
self.collectionView.footer.hidden = (self.totalCount == self.deals.count);
return cell;
}#pragma mark <UICollectionViewDelegate>- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
ZYDetailViewController *detailVc = [[ZYDetailViewController alloc] initWithNibName:@"ZYDetailViewController" bundle:nil];
detailVc.deal = self.deals[indexPath.row];
[self presentViewController:detailVc animated:YES completion:nil];
}@end

其次就是Collect模块和Browse模块，这两个模块很相似，都是需要实现离线缓存，都是需要支持批量删除的，如此，就完全可以将对象相似的功能提取出来，放到基类里面，而这两个类继承自基类，从而可以大大减少代码量，在代码层次、结构上来看，也会好上很多。

我采用的是Sqlite数据库来进行的离线缓存，是这样设计的，有一个自增长的主键，一个团购(deal)model，团购的id，取出数据时，按照主键的倒序排序。

数据库设计代码如下：

#import <Foundation/Foundation.h>@class ZYDeal;@interface ZYDealTool : NSObject
+ (void)addCollectionDeal:(ZYDeal *)deal;
+ (void)removeCollectionDeal:(ZYDeal *)deal;+ (NSArray *)collectDeals:(int)page;
+ (int)collectDealsCount;+ (BOOL)isCollected:(ZYDeal *)deal;+ (void)addBrowseDeal:(ZYDeal *)deal;
+ (void)removeBrowseDeal:(ZYDeal *)deal;+ (NSArray *)browseDeals:(int)page;
+ (int)browseDealsCount;+ (BOOL)isBrowsed:(ZYDeal *)deal;
@end#import "ZYDealTool.h"
#import "FMDB.h"
#import "ZYDeal.h"
@implementation ZYDealToolstatic FMDatabase *_database;+ (void)initialize
{
NSString *doc = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
NSString *path = [doc stringByAppendingPathComponent:@"deal.sqlite"];
_database = [FMDatabase databaseWithPath:path]; if (![_database open]) return; [_database executeUpdateWithFormat:@"CREATE TABLE IF NOT EXISTS t_collect_deal(id integer PRIMARY KEY, deal blob NOT NULL, deal_id text NOT NULL);"]; [_database executeUpdateWithFormat:@"CREATE TABLE IF NOT EXISTS t_browse_deal(id integer PRIMARY KEY, deal blob NOT NULL, deal_id text NOT NULL);"];
}+ (void)addCollectionDeal:(ZYDeal *)deal
{
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:deal];
[_database executeUpdateWithFormat:@"INSERT INTO t_collect_deal(deal, deal_id) VALUES (%@, %@);",data, deal.deal_id];
}
+ (void)removeCollectionDeal:(ZYDeal *)deal
{
[_database executeUpdateWithFormat:@"DELETE FROM t_collect_deal WHERE deal_id = %@;", deal.deal_id];
}+ (NSArray *)collectDeals:(int)page
{
int size = 10;
int pos = (page - 1) * size; NSMutableArray *deals = [NSMutableArray array];
FMResultSet *resultSet = [_database executeQueryWithFormat:@"SELECT * FROM t_collect_deal ORDER BY id DESC LIMIT %d,%d;",pos,size]; while (resultSet.next) {
ZYDeal *deal = [NSKeyedUnarchiver unarchiveObjectWithData:[resultSet objectForColumnName:@"deal"]];
[deals addObject:deal];
}
return deals;
}
+ (int)collectDealsCount
{
FMResultSet *resultSet = [_database executeQueryWithFormat:@"SELECT count(*) AS deal_count FROM t_collect_deal;"];
[resultSet next]; return [resultSet intForColumn:@"deal_count"];
}+ (BOOL)isCollected:(ZYDeal *)deal
{
FMResultSet *resultSet = [_database executeQueryWithFormat:@"SELECT count(*) AS deal_count FROM t_collect_deal WHERE deal_id = %@;", deal.deal_id]; [resultSet next];
#warning 索引从1开始
return [resultSet intForColumn:@"deal_count"] == 1;
}+ (void)addBrowseDeal:(ZYDeal *)deal
{
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:deal];
[_database executeUpdateWithFormat:@"INSERT INTO t_browse_deal(deal, deal_id) VALUES (%@, %@);",data, deal.deal_id];
}+ (void)removeBrowseDeal:(ZYDeal *)deal
{
[_database executeUpdateWithFormat:@"DELETE FROM t_browse_deal WHERE deal_id = %@;", deal.deal_id];
}+ (NSArray *)browseDeals:(int)page
{
int size = 10;
int pos = (page - 1) * size; NSMutableArray *deals = [NSMutableArray array];
FMResultSet *resultSet = [_database executeQueryWithFormat:@"SELECT * FROM t_browse_deal ORDER BY id DESC LIMIT %d,%d;",pos,size]; while (resultSet.next) {
ZYDeal *deal = [NSKeyedUnarchiver unarchiveObjectWithData:[resultSet objectForColumnName:@"deal"]];
[deals addObject:deal];
}
return deals;
}+ (int)browseDealsCount
{
FMResultSet *resultSet = [_database executeQueryWithFormat:@"SELECT count(*) AS deal_count FROM t_browse_deal;"];
[resultSet next]; return [resultSet intForColumn:@"deal_count"];
}+ (BOOL)isBrowsed:(ZYDeal *)deal
{
FMResultSet *resultSet = [_database executeQueryWithFormat:@"SELECT count(*) AS deal_count FROM t_browse_deal WHERE deal_id = %@;", deal.deal_id]; [resultSet next];
#warning 索引从1开始
return [resultSet intForColumn:@"deal_count"] == 1;
}
@end

删除单个、批量删除功能:

这里需要注意的一点就是cell的循环利用功能，你不能只是修改界面展示，而是需要深入去修改导致界面更改的model，这样才可以做到完美的循环利用，不然会导致bug，请注意，在mvc模式下，界面如何展示都是由model决定的，如果要更改，请更改model。还有就是，当点击进去，会是一条团购详情的界面，在这个界面，当我取消收藏之后，回到收藏界面，也是应当同步删除掉取消了收藏的团购数据的，这里需要注意，用Notification发回来的deal和正在展示的那条deal并不会指向同一个内存地址，所以单纯的判断这两条团购数据相等与否是不行的，应当是重写deal的模型的isEqual方法。

下面是代码：

ZYOldDealViewController

#import <UIKit/UIKit.h>@class ZYDeal;@interface ZYOldDealViewController : UICollectionViewController
/**
* 这个方法交给子类去实现，从而得到不同子类的具体背景图片
*
*/
- (NSString *)bgImageName;/**
* 这个方法交给子类去实现，从而得到不同子类数据库里的具体数据
*
*/
- (NSArray *)arrayWithCurretnPage:(int)currentPage;/**
* 这个方法教给子类去调用，移除deals内所有数据，重新从数据库里加载
*/
- (void)removeDealsAllObjects;/**
* 让子类实现这个方法，返回数据库中还有多少条团购数据
*
*/
- (int)countForDeals;/**
* 让子类实现这个方法，返回navigationBar的标题
*
*/
- (NSString *)titleForNavBar;/**
* 让子类实现这个方法，删除掉自身数据库内拥有的deal
*
*/
- (void)deletedSqliteDeal:(ZYDeal *)deal;
@end#import "ZYOldDealViewController.h"
#import "ZYDeal.h"
#import "UIView+AutoLayout.h"
#import "ZYConst.h"
#import "MJRefresh.h"
#import "UIView+Extension.h"
#import "ZYDealCell.h"
#import "ZYDetailViewController.h"
#import "ZYDealTool.h"
#import "UIBarButtonItem+ZYExtension.h"@interface ZYOldDealViewController ()
/** 当没有团购数据时，显示一张没有数据的背景 */
@property (nonatomic, strong) UIImageView *backgroundImageView;@property (nonatomic, strong) NSMutableArray *deals;@property (nonatomic, assign) int currentPage;@property (nonatomic, strong) UIBarButtonItem *backItem;@property (nonatomic, strong) UIBarButtonItem *selectedAllItem;@property (nonatomic, strong) UIBarButtonItem *unselectedAllItem;@property (nonatomic, strong) UIBarButtonItem *delectedItem;
@end@implementation ZYOldDealViewControllerstatic NSString * const reuseIdentifier = @"ZYDealViewControllerCell";- (UIImageView *)backgroundImageView
{
if (!_backgroundImageView) {
_backgroundImageView = [[UIImageView alloc] init];
NSString *imageName = [self bgImageName];
_backgroundImageView.image = [UIImage imageNamed:imageName];
[self.view addSubview:_backgroundImageView];
[_backgroundImageView autoCenterInSuperview];
}
return _backgroundImageView;
}- (NSMutableArray *)deals
{
if (!_deals) {
_deals = [NSMutableArray array];
}
return _deals;
}#pragma mark ----barButtonItem的懒加载
- (UIBarButtonItem *)backItem
{
if (!_backItem) {
_backItem = [UIBarButtonItem barButtonItemWithTarget:self action:@selector(clickbackItem) normalImage:@"icon_back" highImage:@"icon_back_highlighted"];
}
return _backItem;
}- (UIBarButtonItem *)selectedAllItem
{
if (!_selectedAllItem) {
_selectedAllItem = [[UIBarButtonItem alloc] initWithTitle:@" 全选 " style:UIBarButtonItemStyleDone target:self action:@selector(clickSelectedAllItem)];
}
return _selectedAllItem;
}- (UIBarButtonItem *)unselectedAllItem
{
if (!_unselectedAllItem) {
_unselectedAllItem = [[UIBarButtonItem alloc] initWithTitle:@" 全不选 " style:UIBarButtonItemStyleDone target:self action:@selector(clickUnselectedAllItem)];
}
return _unselectedAllItem;
}- (UIBarButtonItem *)delectedItem
{
if (!_delectedItem) {
_delectedItem = [[UIBarButtonItem alloc] initWithTitle:@" 删除 " style:UIBarButtonItemStyleDone target:self action:@selector(clickDelectedItem)];
}
return _delectedItem;
}
- (instancetype)init
{
UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init]; //设置cell的大小
layout.itemSize = CGSizeMake(305, 305);
return [self initWithCollectionViewLayout:layout];
}/**
当屏幕旋转,控制器view的尺寸发生改变调用
*/
- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
{
// 根据屏幕宽度决定列数
int cols = (size.width == 1024) ? 3 : 2;
// 根据列数计算内边距
UICollectionViewFlowLayout *layout = (UICollectionViewFlowLayout *)self.collectionViewLayout;
CGFloat inset = (size.width - cols * layout.itemSize.width) / (cols + 1);
layout.sectionInset = UIEdgeInsetsMake(inset, inset, inset, inset);
// 设置每一行之间的间距
layout.minimumLineSpacing = inset;
}- (void)viewDidLoad {
[super viewDidLoad]; [self setupNav]; [self setupNavItem]; [self setupCollection]; [self loadMoreDeals];
}#pragma mark ----setup系列
- (void)setupNav
{
UINavigationBar *appearance = [UINavigationBar appearance]; // 设置文字属性
NSMutableDictionary *textAttrs = [NSMutableDictionary dictionary];
textAttrs[UITextAttributeTextColor] = [UIColor blackColor]; textAttrs[UITextAttributeFont] = [UIFont boldSystemFontOfSize:20];//粗体，
// UIOffsetZero是结构体, 只要包装成NSValue对象, 才能放进字典\数组中
textAttrs[UITextAttributeTextShadowOffset] = [NSValue valueWithUIOffset:UIOffsetZero];
[appearance setTitleTextAttributes:textAttrs]; self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"编辑" style:UIBarButtonItemStyleDone target:self action:@selector(clickEditBarButton:)]; self.navigationItem.leftBarButtonItems = @[self.backItem]; self.navigationItem.title = [self titleForNavBar];
}- (void)setupNavItem
{
//通过设置这个属性，可是设置整个导航栏的UIBarButtonItem的属性
UIBarButtonItem *appearance = [UIBarButtonItem appearance];
//设置普通状态下得文字属性
NSMutableDictionary *textAttrs = [NSMutableDictionary dictionary];
//文字颜色
textAttrs[NSForegroundColorAttributeName] = ZYColor(47,188,173);
//文字字体
textAttrs[NSFontAttributeName] = [UIFont systemFontOfSize:18.0];
[appearance setTitleTextAttributes:textAttrs forState:UIControlStateNormal]; // 设置不可用状态(disable)的文字属性
NSMutableDictionary *disableTextAttrs = [NSMutableDictionary dictionary];
disableTextAttrs[NSForegroundColorAttributeName] = [UIColor lightGrayColor];
disableTextAttrs[NSFontAttributeName] = [UIFont systemFontOfSize:15];
[appearance setTitleTextAttributes:disableTextAttrs forState:UIControlStateDisabled];
}- (void)setupCollection
{
[self.collectionView registerNib:[UINib nibWithNibName:@"ZYDealCell" bundle:nil] forCellWithReuseIdentifier:reuseIdentifier]; self.collectionView.backgroundColor = ZYGlobalBg;
self.collectionView.alwaysBounceVertical = YES;
self.collectionView.footer = [MJRefreshAutoNormalFooter footerWithRefreshingTarget:self refreshingAction:@selector(footerRefresh)];}#pragma mark ----与数据库进行交互
- (void)loadMoreDeals
{
self.currentPage++; NSArray *tempArray = [self arrayWithCurretnPage:self.currentPage]; [self.deals addObjectsFromArray:tempArray]; [self.collectionView reloadData]; [self.collectionView.footer endRefreshing];
}#pragma mark ----刷新方法
- (void)footerRefresh
{
[self loadMoreDeals];
}#pragma mark ----click事件- (void)clickbackItem
{
[self.navigationController popViewControllerAnimated:YES];
}- (void)clickEditBarButton:(UIBarButtonItem *)item
{
if ([item.title isEqualToString:@"完成"]) {
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"编辑" style:UIBarButtonItemStyleDone target:self action:@selector(clickEditBarButton:)];
self.navigationItem.leftBarButtonItems = @[self.backItem]; [self.deals enumerateObjectsUsingBlock:^(ZYDeal *obj, NSUInteger idx, BOOL *stop) {
obj.editing = NO;
obj.checking = NO;
}]; }
else{
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"完成" style:UIBarButtonItemStyleDone target:self action:@selector(clickEditBarButton:)];
self.navigationItem.leftBarButtonItems = self.navigationItem.leftBarButtonItems = @[self.backItem, self.selectedAllItem, self.unselectedAllItem, self.delectedItem]; [self.deals enumerateObjectsUsingBlock:^(ZYDeal *obj, NSUInteger idx, BOOL *stop) {
obj.editing = YES;
}];
} [self.collectionView reloadData];
}- (void)clickSelectedAllItem
{
[self.deals enumerateObjectsUsingBlock:^(ZYDeal *obj, NSUInteger idx, BOOL *stop) {
obj.checking = YES;
}];
[self.collectionView reloadData];
}- (void)clickUnselectedAllItem
{
[self.deals enumerateObjectsUsingBlock:^(ZYDeal *obj, NSUInteger idx, BOOL *stop) {
obj.checking = NO;
}];
[self.collectionView reloadData];
}- (void)clickDelectedItem
{
NSMutableArray *deletedArray = [NSMutableArray array]; //需要注意的是，在遍历数组的时候，是不可以删除数组内元素的
[self.deals enumerateObjectsUsingBlock:^(ZYDeal *obj, NSUInteger idx, BOOL *stop) {
if (obj.isChecking) {
[deletedArray addObject:obj];
}
}]; [deletedArray enumerateObjectsUsingBlock:^(ZYDeal *obj, NSUInteger idx, BOOL *stop) {
[self.deals removeObject:obj];
[self deletedSqliteDeal:obj];
}]; [self.collectionView reloadData];
}#pragma mark ----其他
- (void)removeDealsAllObjects
{
[self.deals removeAllObjects];
self.currentPage = 0;
}#pragma mark <UICollectionViewDataSource>- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView { return 1;
}- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
//需要在请求发送就设置以此cell的布局
[self viewWillTransitionToSize:CGSizeMake(self.collectionView.width, self.collectionView.height) withTransitionCoordinator:nil]; if (self.deals.count == 0 && [self.navigationItem.rightBarButtonItem.title isEqualToString:@"完成"]) {
[self clickEditBarButton:self.navigationItem.rightBarButtonItem];
}
self.backgroundImageView.hidden = (self.deals.count != 0);
self.navigationItem.rightBarButtonItem.enabled = (self.deals.count != 0);
return self.deals.count;
}- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
ZYDealCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath];
cell.deal = self.deals[indexPath.row]; self.collectionView.footer.hidden = (self.deals.count == [self countForDeals]);
return cell;
}#pragma mark <UICollectionViewDelegate>- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
ZYDetailViewController *detailVc = [[ZYDetailViewController alloc] initWithNibName:@"ZYDetailViewController" bundle:nil];
detailVc.deal = self.deals[indexPath.row];
[self presentViewController:detailVc animated:YES completion:nil];
}@end

ZYCollectViewController是继承自ZYOldDealViewController的，所以相应代码比较少：

#import <UIKit/UIKit.h>
#import "ZYOldDealViewController.h"
@interface ZYCollectViewController : ZYOldDealViewController@end#import "ZYCollectViewController.h"
#import "ZYDeal.h"
#import "ZYConst.h"
#import "MJRefresh.h"
#import "UIView+Extension.h"
#import "ZYDealCell.h"
#import "ZYDetailViewController.h"
#import "ZYDealTool.h"
#import "UIBarButtonItem+ZYExtension.h"@interface ZYCollectViewController ()
@end@implementation ZYCollectViewController- (NSString *)bgImageName
{
return @"icon_collects_empty";
}- (void)viewDidLoad {
[super viewDidLoad]; [self setupNotification]; [self loadDeals];
}#pragma mark ----setup系列- (void)setupNotification
{
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(collectStateDidChange:) name:ZYCollectStateDidChangeNotification object:nil];
}- (void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self];
}#pragma mark ----与数据库进行交互
- (void)loadDeals
{
[self.collectionView.footer beginRefreshing];
}- (void)deletedSqliteDeal:(ZYDeal *)deal
{
[ZYDealTool removeCollectionDeal:deal];
}
#pragma mark ----notification系列
- (void)collectStateDidChange:(NSNotification *)note
{
[self removeDealsAllObjects];
[self loadDeals];
}#pragma mark ----其他
- (NSArray *)arrayWithCurretnPage:(int)currentPage
{
return [ZYDealTool collectDeals:currentPage];
}- (int)countForDeals
{
return [ZYDealTool collectDealsCount];
}- (NSString *)titleForNavBar
{
return @"收藏";
}@end

同理，ZYBrowseViewController也是继承自ZYOldDealViewController的

#import "ZYBrowseViewController.h"
#import "MJRefresh.h"
#import "ZYConst.h"
#import "ZYDealTool.h"
@interface ZYBrowseViewController ()@end@implementation ZYBrowseViewController- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view. [self loadDeals];
}- (NSString *)bgImageName
{
return @"icon_latestBrowse_empty";
}- (NSArray *)arrayWithCurretnPage:(int)currentPage
{
return [ZYDealTool browseDeals:currentPage];
}- (int)countForDeals
{
return [ZYDealTool browseDealsCount];
}- (NSString *)titleForNavBar
{
return @"浏览记录";
}
#pragma mark ----与数据库进行交互
- (void)loadDeals
{
[self.collectionView.footer beginRefreshing];
}- (void)deletedSqliteDeal:(ZYDeal *)deal
{
[ZYDealTool removeBrowseDeal:deal];
}@end