////  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 = 3;    // 2.商品的宽度 和 高度    CGFloat width = 80;    CGFloat height = 100;    // 3.求出水平间距 和 垂直间距    CGFloat hMargin = (self.shopCarView.frame.size.width - allCols * width) / (allCols -1);    CGFloat vMargin = (self.shopCarView.frame.size.height - 2 * height) / 1;    // 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(0, 0, 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(0, 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);        // 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 != 0);    }@end