iOS UI-团购案例（通过xib文件自定义UITableViewCell）

一、Model

 #import <Foundation/Foundation.h>

 @interface Goods : NSObject

 @property (nonatomic, copy) NSString *icon;
 @property (nonatomic, copy) NSString *title;
 @property (nonatomic, copy) NSString *price;
 @property (nonatomic, copy) NSString *buyCount;

 - (instancetype) initWithDict:(NSDictionary *)dict;
 + (instancetype) goodsWithDict:(NSDictionary *)dict;

 @end

 #import "Goods.h"

 @implementation Goods

 - (instancetype)initWithDict:(NSDictionary *)dict
 {
     if (self = [super init]) {
         [self setValuesForKeysWithDictionary:dict];
     }
     return self;
 }

 + (instancetype)goodsWithDict:(NSDictionary *)dict
 {
     return [[self alloc] initWithDict:dict];
 }

 @end

二、View

 #import <UIKit/UIKit.h>

 @interface BWHeaderView : UIView

 + (instancetype)headerView;

 @end

 #import "BWHeaderView.h"

 @interface BWHeaderView ()
 @property (weak, nonatomic) IBOutlet UIScrollView *scrollView;

 @end

 @implementation BWHeaderView

 //当这个方法被执行的时候就表示BWHeaderView已经从xib文件中创建好了
 //BWHeaderView的子控件也都创建好了，所以就可以使用UIScrollView了。
 - (void)awakeFromNib
 {

 }

 //创建headerView
 + (instancetype)headerView
 {
     BWHeaderView *headerView = [[[NSBundle mainBundle] loadNibNamed:@"BWHeaderView" owner:nil options:nil] lastObject];
     return headerView;
 }

 @end

 #import <UIKit/UIKit.h>

 // 协议命名规范:
 // 类名 + Delegate
 // 协议中的方法最好加@optional
 // 定义一个delegate属性,delegate属性用weak
 // delegate属性声明为id类型,可以用来解除对头文件的依赖

 @class BWFooterView;
 @protocol  BWFooterViewDelegate <NSObject>

 @required
 - (void)footerViewUpDateData:(BWFooterView *)footerView;
 @end

 @interface BWFooterView : UIView

 @property(weak, nonatomic) id<BWFooterViewDelegate> delegate;

 + (instancetype)footerView;

 @end

 #import "BWFooterView.h"

 @interface BWFooterView ()
 @property (weak, nonatomic) IBOutlet UIButton *btnLoadMore;
 @property (weak, nonatomic) IBOutlet UIView *waittingView;
 - (IBAction)btnLoadMoreClick:(id)sender;

 @end

 @implementation BWFooterView

 //通过xib设置tableView中的tableFooterView
 + (instancetype)footerView
 {
     BWFooterView *footerView = [[[NSBundle mainBundle] loadNibNamed:@"BWFooterView" owner:nil options:nil] lastObject];
     return footerView;
 }

 //加载按钮单击事件
 - (IBAction)btnLoadMoreClick:(id)sender {

     //1.隐藏“加载更多”按钮
     self.btnLoadMore.hidden = YES;
     //2.显示“等待指示器”所在的那个View
     self.waittingView.hidden = NO;

     dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
         //调用代理方法
         if ([self.delegate respondsToSelector:@selector(footerViewUpDateData:)]) {
             //3.增加一条数据
             //3.1创建一个模型对象
             //3.2把模型对象加载控制器的goods集合中
             //4.刷新UITableView
             [self.delegate footerViewUpDateData:self];
         }
         //5.显示“加载更多”按钮
         self.btnLoadMore.hidden = NO;
         //6.隐藏“等待指示器”所在的那个View
         self.waittingView.hidden = YES;
     });

 }
 @end

 #import <UIKit/UIKit.h>
 @class Goods;

 @interface BWGoodsCell : UITableViewCell

 @property (weak, nonatomic) IBOutlet UIImageView *imgView;
 @property (weak, nonatomic) IBOutlet UILabel *lblName;
 @property (weak, nonatomic) IBOutlet UILabel *lblPrice;
 @property (weak, nonatomic) IBOutlet UILabel *lblBuyCount;

 @property (strong, nonatomic) Goods *myGoods;

 + (instancetype)goodsCellWithTableView:(UITableView *)tableView;
 @end

 #import "BWGoodsCell.h"
 #import "Goods.h"

 @interface BWGoodsCell ()

 @end

 @implementation BWGoodsCell

 // 重写setMyGoods方法，把模型的数据设置给子控件
 - (void)setMyGoods:(Goods *)myGoods
 {
     _myGoods = myGoods;

     self.imgView.image = [UIImage imageNamed:_myGoods.icon];
     self.lblName.text = _myGoods.title;
     self.lblPrice.text = [NSString stringWithFormat:@"$ %@",_myGoods.price];
     self.lblBuyCount.text = [NSString stringWithFormat:@"%@个人已购买",_myGoods.buyCount];
 }

 // 创建单元格
 + (instancetype)goodsCellWithTableView:(UITableView *)tableView
 {
     static NSString *cellIndentifier = @"cellIndentifier";
     BWGoodsCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIndentifier];

     if (!cell) {
         cell = [[[NSBundle mainBundle] loadNibNamed:@"BWGoodsCell" owner:nil options:nil] firstObject];
     }
     return cell;
 }
 - (void)awakeFromNib {
     // Initialization code
 }

 - (void)setSelected:(BOOL)selected animated:(BOOL)animated {
     [super setSelected:selected animated:animated];

     // Configure the view for the selected state
 }

 @end

三、Controller

 #import "ViewController.h"
 #import "Goods.h"
 #import "BWGoodsCell.h"
 #import "BWFooterView.h"
 #import "BWHeaderView.h"

 @interface ViewController ()<UITableViewDataSource,BWFooterViewDelegate>

 @property (nonatomic, strong) NSMutableArray *arrayModel;
 @property (nonatomic, strong) UITableView *tableView;

 @end

 @implementation ViewController

 #pragma mark - 懒加载
 - (NSArray *)arrayModel
 {
     if (_arrayModel == nil) {
         NSString *path = [[NSBundle mainBundle] pathForResource:@"tgs.plist" ofType:nil];

         NSArray *arrayDict = [NSArray arrayWithContentsOfFile:path];

         NSMutableArray *arrayModel = [NSMutableArray array];

         for (NSDictionary *dict in arrayDict) {
             Goods *goodsModel = [Goods goodsWithDict:dict];
             [arrayModel addObject:goodsModel];
         }
         _arrayModel = arrayModel;
     }

     return _arrayModel;
 }

 #pragma mark - 加载视图
 - (void)viewDidLoad {
     [super viewDidLoad];
     self.tableView = [[UITableView alloc] initWithFrame:self.view.frame style:UITableViewStyleGrouped];
     self.tableView.dataSource =self;

     [self.view addSubview:self.tableView];
     self.tableView.rowHeight = ;

     //ps:tableView 的tableFooterView特点：只能修改x和height值，y和height不能修改

     //创建tableFooterView
     BWFooterView *footerView = [BWFooterView footerView];
     //设置footerView的代理
     footerView.delegate =self;
     self.tableView.tableFooterView = footerView;

     //创建tableHeaderView
     BWHeaderView *headerView = [BWHeaderView headerView];

     self.tableView.tableHeaderView = headerView;

 }
 #pragma mark - CZFooterView的代理方法
 - (void)footerViewUpDateData:(BWFooterView *)footerView
 {
     //3.增加一条数据
     //3.1创建一个模型对象
     Goods *model = [[Goods alloc] init];
     model.title = @"驴肉火烧";
     model.price = @"6.0";
     model.buyCount = @"";
     model.icon = @"7003217f16ed29bab85e635a3bd6b60d";
     //3.2把模型对象加载控制器的goods集合中
     [self.arrayModel addObject:model];
     //4.刷新UITableView
     [self.tableView reloadData];

     //ps:局部刷新（仅适用于UITableView的总行数没有发生变化的时候）
 //    NSIndexPath *indexpath =  [NSIndexPath indexPathForRow:self.arrayModel.count-1 inSection:0];
 //    [self.tableView reloadRowsAtIndexPaths:@[indexpath] withRowAnimation:UITableViewRowAnimationLeft];

     //5.把UITableView中最后一行滚动到最上面
     NSIndexPath *indexpath =  [NSIndexPath indexPathForRow:self.arrayModel.count- inSection:];
     [self.tableView scrollToRowAtIndexPath:indexpath atScrollPosition:UITableViewScrollPositionTop animated:YES];
 }

 #pragma mark - 数据源
 //加载组的行数
 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
 {
     return self.arrayModel.count;
 }
 //加载单元格数据
 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
 {
     //1.获取数据模型
     Goods *goodsModel = self.arrayModel[indexPath.row];

     //2.创建单元格
     BWGoodsCell *cell = [BWGoodsCell goodsCellWithTableView:tableView];

 //   在控制器中直接为cell的每个子控件赋值数据造成问题
 // 1>控制器强依赖于cell，一旦cell内部的子控件发生变化，那么子控件中的代码也得改（紧耦合）
 // 2>cell封装不够完整，凡是用到cell的地方
 // 3>解决：直接把模型传递给自定义cell，然后在自定义cell内部解析model中的数据赋值给自定义cell的内部的子控件

     //3.把模型数据设置给单元格
     cell.myGoods = goodsModel;

     //4.返回单元格
     return cell;
 }

 #pragma mark - 状态栏
 - (BOOL)prefersStatusBarHidden
 {
     return YES;
 }

 #pragma mark - 内存
 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }

 @end