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

#import "ViewController.h"

@interface ViewController ()

// 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 ViewController
/**
* 懒加载
1.作用:
1>用到的时候再加载
2>全局只会被加载一次
3>全局都可以使用

过程:  
1.重写成员变量的get方法  
2.在get方法中判断:  
  1>如果为空,加载数据  
  2>如果不为空,就直接返回数据  

*/

• (NSArray *)dataArr{
  if (_dataArr == nil) {
  // 加载数据
  self.dataArr = @[
  @{@"name":@"单肩包", @"icon":@"danjianbao"},
  @{@"name":@"钱包", @"icon":@"qianbao"},
  @{@"name":@"链条包", @"icon":@"liantiaobao"},
  @{@"name":@"手提包", @"icon":@"shoutibao"},
  @{@"name":@"双肩包", @"icon":@"shuangjianbao"},
  @{@"name":@"斜挎包", @"icon":@"xiekuabao"}
  ];
  }
  return _dataArr;
  }

// 初始化数据

• (void)viewDidLoad {
  [super viewDidLoad];

// NSArray *dataArr = @[
// @{@"name":@"单肩包", @"icon":@"danjianbao"},
// @{@"name":@"钱包", @"icon":@"qianbao"},
// @{@"name":@"链条包", @"icon":@"liantiaobao"},
// @{@"name":@"手提包", @"icon":@"shoutibao"},
// @{@"name":@"双肩包", @"icon":@"shuangjianbao"},
// @{@"name":@"斜挎包", @"icon":@"xiekuabao"}
// ];
// self.dataArr = dataArr;
}

/**
* 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*****************************/
// 1.创建商品的view
UIView *shopView = [[UIView alloc] init];

// 2.设置frame
shopView.frame = CGRectMake(x, y, width, height);

// 3.设置背景颜色
shopView.backgroundColor = [UIColor greenColor];

// 4.添加到购物车
[self.shopCarView addSubview:shopView];

// 5.创建商品的UIImageView对象
UIImageView *iconView = [[UIImageView alloc] init];
iconView.frame = CGRectMake(, , width, width);
iconView.backgroundColor = [UIColor blueColor];
[shopView addSubview:iconView];

// 6.创建商品标题对象
UILabel *titleLabel = [[UILabel alloc] init];
titleLabel.frame = CGRectMake(, width, width, height - width);
titleLabel.backgroundColor = [UIColor yellowColor];
titleLabel.textAlignment = NSTextAlignmentCenter; // 居中
[shopView addSubview:titleLabel];

/***********************3.设置数据*****************************/
// 方式四 (数组 + 字典)
/*
NSArray *dataArr = @[
@{@"name":@"单肩包", @"icon":@"danjianbao"},
@{@"name":@"钱包", @"icon":@"qianbao"},
@{@"name":@"链条包", @"icon":@"liantiaobao"},
@{@"name":@"手提包", @"icon":@"shoutibao"},
@{@"name":@"双肩包", @"icon":@"shuangjianbao"},
@{@"name":@"斜挎包", @"icon":@"xiekuabao"}
];
*/
// 懒加载
/*
if (self.dataArr == nil) {
self.dataArr = @[
@{@"name":@"单肩包", @"icon":@"danjianbao"},
@{@"name":@"钱包", @"icon":@"qianbao"},
@{@"name":@"链条包", @"icon":@"liantiaobao"},
@{@"name":@"手提包", @"icon":@"shoutibao"},
@{@"name":@"双肩包", @"icon":@"shuangjianbao"},
@{@"name":@"斜挎包", @"icon":@"xiekuabao"}
];
}
*/
// 设置数据
NSDictionary *dict = self.dataArr[index];//调用get方法
iconView.image = [UIImage imageNamed:dict[@"icon"]];
titleLabel.text = dict[@"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
  /*
  if (self.shopCarView.subviews.count == 0) {
  self.removeButton.enabled = NO;
  }
  */
  self.removeButton.enabled = (self.shopCarView.subviews.count != );

}
@end