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 = 100;

    //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 = @"1000";
    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-1 inSection:0];
    [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