//
// ViewController.m
// 03-综合练习
//

#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;
// 全局的下标
//@property (nonatomic, assign) NSInteger index;

@end

@implementation ViewController

• (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*****************************/
// 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*****************************/
// 数值数据
/*
// 方式一: (不可取:数据都是一样)
iconView.image = [UIImage imageNamed:@"danjianbao"];
titleLabel.text = @"单肩包";
*/

// 方式二 (不可取:太冗余)  
/\*  
if (index == 0) {  
    iconView.image = \[UIImage imageNamed:@"danjianbao"\];  
    titleLabel.text = @"单肩包";  
}else if (index == 1){  
    iconView.image = \[UIImage imageNamed:@"qianbao"\];  
    titleLabel.text = @"钱包";  
}else if (index == 2){  
    iconView.image = \[UIImage imageNamed:@"danjianbao"\];  
    titleLabel.text = @"单肩包";  
}else if (index == 3){  
    iconView.image = \[UIImage imageNamed:@"danjianbao"\];  
    titleLabel.text = @"单肩包";  
}else if (index == 4){  
    iconView.image = \[UIImage imageNamed:@"danjianbao"\];  
    titleLabel.text = @"单肩包";  
}else if (index == 5){  
    iconView.image = \[UIImage imageNamed:@"danjianbao"\];  
    titleLabel.text = @"单肩包";  
}  
 \*/

// 方式三 (数组: (两个数组之间没有任何联系,容易出错))  
/\*  
NSArray<NSString \*> \*imageNames = @\[@"danjianbao", @"qianbao", @"liantiaobao", @"shoutibao", @"shuangjianbao", @"xiekuabao"\];  
NSArray<NSString \*> \*titleNames = @\[@"单肩包", @"钱包", @"链条包", @"手提包", @"双肩包", @"斜挎包"\];  
// 设置数据  
iconView.image = \[UIImage imageNamed:imageNames\[index\]\];  
titleLabel.text = titleNames\[index\];  
 \*/

// 方式四 (数组 + 字典)  
NSArray<NSDictionary \*> \*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 = dataArr\[index\];  
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