故事板控制器：

//
// XMGViewController.m
// 03-综合练习
//
// Created by xiaomage on 15/12/28.
// Copyright © 2015年 小码哥. All rights reserved.
//

#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
*/

• (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 = \[XMGShopView shopView\];  
shopView.frame = CGRectMake(x, y, width, height);  
// 设置数据  
shopView.shop = self.dataArr\[index\];//set方法  
\[self.shopCarView addSubview:shopView\];

/***********************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

xib界面：

xib界面对应的类：

//
// XMGShopView.h

#import
@class XMGShop;

@interface XMGShopView : UIView
/** 数据模型 */
@property (nonatomic, strong) XMGShop *shop;

// 快速构造方法

• (instancetype)shopView;
  @end

//
// XMGShopView.m

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

@interface XMGShopView ()

@property (weak, nonatomic) IBOutlet UIImageView *iconView;//跟xib界面连线了的
@property (weak, nonatomic) IBOutlet UILabel *titlelabel;//跟xib界面连线了的

@end

@implementation XMGShopView

• (instancetype)shopView{
  //return [[[NSBundle mainBundle] loadNibNamed:@"XMGShopView" owner:nil options:nil] firstObject]; //XMGShopView是xib的名字
  return [[[NSBundle mainBundle] loadNibNamed:NSStringFromClass(self) owner:nil options:nil] firstObject];
  }

//- (void)awakeFromNib //加子控件

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

  // 设置界面图片和文字
  self.iconView.image = [UIImage imageNamed:shop.icon];
  self.titlelabel.text = shop.name;
  }
  @end

xib界面的数据bean类：

//
// XMGShop.h
// 03-综合练习
//
// Created by xiaomage on 15/12/29.
// Copyright © 2015年 小码哥. All rights reserved.
//

#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
// 03-综合练习
//
// Created by xiaomage on 15/12/29.
// Copyright © 2015年 小码哥. All rights reserved.
//

#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

故事板：