ios13--购物车优化

//

//  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