控制器：

// XMGViewController.h

#import

@interface XMGViewController : UIViewController

@end

// XMGViewController.m

#import "XMGViewController.h"
#import "XMGShop.h"
#import "XMGShopView.h"

@interface XMGViewController ()

// 购物车
@property (weak, nonatomic) IBOutlet UIView *shopCarView;
// 添加按钮
@property (weak, nonatomic) IBOutlet UIButton *addButton;
// 删除按钮
@property (weak, nonatomic) IBOutlet UIButton *removeButton;

/** 数据数组 */
@property (nonatomic, strong) NSArray *dataArr;
@end

@implementation XMGViewController
/**
* 懒加载,get方法
*/

• (NSArray *)dataArr{
  if (_dataArr == nil) {
  // 加载数据
  // 1.获取全路径
  NSString *dataPath = [[NSBundle mainBundle] pathForResource:@"shopData.plist" ofType:nil];
  self.dataArr = [NSArray arrayWithContentsOfFile:dataPath];
  // 字典转模型
  // 创建临时数组
  NSMutableArray *tempArray = [NSMutableArray array];
  for (NSDictionary *dict in _dataArr) {
  // 创建shop对象
  XMGShop *shop = [XMGShop shopWithDict:dict];
  // 把模型装入数组
  [tempArray addObject:shop];
  }
  self.dataArr = tempArray;
  }
  return _dataArr;
  }

// 初始化数据

• (void)viewDidLoad {
  [super viewDidLoad];
  }

/**
* 添加到购物车
*
* @param button 按钮
*/

• (IBAction)add:(UIButton *)button {
  /***********************1.定义一些常量*****************************/
  // 1.总列数
  NSInteger allCols = ;
  // 2.商品的宽度 和 高度
  CGFloat width = ;
  CGFloat height = ;
  // 3.求出水平间距 和 垂直间距
  CGFloat hMargin = (self.shopCarView.frame.size.width - allCols * width) / (allCols -);
  CGFloat vMargin = (self.shopCarView.frame.size.height - * height) / ;
  // 4. 设置索引
  NSInteger index = self.shopCarView.subviews.count;
  // 5.求出x值
  CGFloat x = (hMargin + width) * (index % allCols);
  CGFloat y = (vMargin + height) * (index / allCols);

/***********************2.创建一个商品*****************************/
/*
XMGShopView *shopView = [[XMGShopView alloc] init];
shopView.frame = CGRectMake(x, y, width, height);
// 设置数据
XMGShop *shop = self.dataArr[index];
shopView.shop = shop;
[self.shopCarView addSubview:shopView];
*/

XMGShopView \*shopView = \[XMGShopView shopViewWithShop:self.dataArr\[index\]\];  
shopView.frame = CGRectMake(x, y, width, height);  
\[self.shopCarView addSubview:shopView\];

/***********************3.设置数据*****************************/
// 设置数据
// XMGShop *shop = self.dataArr[index];
// [shopView setIcon:shop.icon];
// [shopView setName:shop.name];

/***********************4.设置按钮的状态*****************************/

button.enabled = (index != );

// 5.设置删除按钮的状态  
self.removeButton.enabled = YES;

}

/**
* 从购物车中删除
*
* @param button 按钮
*/

• (IBAction)remove:(UIButton *)button {
  // 1. 删除最后一个商品
  UIView *lastShopView = [self.shopCarView.subviews lastObject];
  [lastShopView removeFromSuperview];

  // 3. 设置添加按钮的状态
  self.addButton.enabled = YES;

  // 4. 设置删除按钮的状态
  self.removeButton.enabled = (self.shopCarView.subviews.count != );

}
@end

自定义控件：

// XMGShopView.h

#import
@class XMGShop;

@interface XMGShopView : UIView

/** 商品模型 */
@property (nonatomic, strong) XMGShop *shop;

// 构造方法

• (instancetype)initWithShop: (XMGShop *)shop;
• (instancetype)shopViewWithShop: (XMGShop *)shop;

@end

// XMGShopView.m

#import "XMGShopView.h"
#import "XMGShop.h"

@interface XMGShopView ()
/** 图片控件 */
@property (nonatomic, weak) UIImageView *iconView;
/** 标题控件 */
@property (nonatomic, weak) UILabel *titleLabel;
@end

@implementation XMGShopView

/**
* 初始化子控件(不要设置frame)
*
*/

• (instancetype)init{
  if (self = [super init]) {
  [self setUp];
  }
  return self;
  }

//构造方法，对象方法

• (instancetype)initWithShop:(XMGShop *)shop{
  if (self = [super init]) {
  // 注意:先创建后赋值，不然空指针，
  [self setUp];
  self.shop = shop;//调用set方法
  }
  return self;
  }
  //构造方法，类方法
• (instancetype)shopViewWithShop:(XMGShop *)shop{
  return [[self alloc] initWithShop:shop];
  }

/**
* 初始化
*/

• (void)setUp{
  // 1.创建商品的UIImageView对象
  UIImageView *iconView = [[UIImageView alloc] init];
  iconView.backgroundColor = [UIColor blueColor];
  [self addSubview:iconView];
  _iconView = iconView;

  // 2.创建商品标题对象
  UILabel *titleLabel = [[UILabel alloc] init];
  titleLabel.backgroundColor = [UIColor yellowColor];
  titleLabel.textAlignment = NSTextAlignmentCenter; // 居中
  [self addSubview:titleLabel];
  _titleLabel = titleLabel;
  }

/**
* 布局子控件(可以拿到frame)
*/

• (void)layoutSubviews{
  // 0.一定要调用super
  [super layoutSubviews];

  // 1.获取当前控件的尺寸
  CGFloat width = self.frame.size.width;
  CGFloat height = self.frame.size.height;

  // 2.设置子控件的frame
  self.iconView.frame = CGRectMake(, , width, width);
  self.titleLabel.frame = CGRectMake(, width, width, height - width);
  }

/**
* 重写set方法:只要外边传数据就会调用
* 作用:设置数据
*/

• (void)setShop:(XMGShop *)shop{
  _shop = shop;

  // 设置数据
  self.iconView.image = [UIImage imageNamed:shop.icon];
  self.titleLabel.text = shop.name;
  }

@end

bean:

// XMGShop.h

#import

@interface XMGShop : NSObject

/** 图片的名称 */
@property (nonatomic, copy) NSString *icon;
/** 商品的名称 */
@property (nonatomic, copy) NSString *name;

// 提供构造方法
/*

• (instancetype)initWithIcon: (NSString *)icon name: (NSString *)name;

• (instancetype)shopWithIcon: (NSString *)icon name: (NSString *)name;
  */

• (instancetype)initWithDict:(NSDictionary *)dict;

• (instancetype)shopWithDict:(NSDictionary *)dict;

@end

// XMGShop.m

#import "XMGShop.h"

@implementation XMGShop
/*

• (instancetype)initWithIcon:(NSString *)icon name:(NSString *)name{
  if (self = [super init]) {
  self.icon = icon;
  self.name = name;
  }
  return self;
  }

• (instancetype)shopWithIcon:(NSString *)icon name:(NSString *)name{
  return [[self alloc] initWithIcon:icon name:name];
  }
  */

• (instancetype)initWithDict:(NSDictionary *)dict{
  if (self = [super init]) {
  self.icon = dict[@"icon"];
  self.name = dict[@"name"];
  }
  return self;
  }

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

@end