ios15--综合小例子

//
//  XMGViewController.m,控制器类

#import "XMGViewController.h"
#import "XMGShop.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];//Supporting Files下面的shopData.plist文件。
        self.dataArr = [NSArray arrayWithContentsOfFile:dataPath];  //dataPath = @"/Users/mctc/Library/Developer/CoreSimulator/Devices/4E7E6AB7-BB75-4C2C-9D87-21A0369A3DD6/data/Containers/Bundle/Application/A855282B-7D1A-450A-B3C3-8ACE93443577/03-综合练习.app/shopData.plist"    0x00007fafe150ef70
        NSLog(@"%@",self.dataArr);  //调用了get方法。
        /*(
        {
            icon = danjianbao;
            name = "U5355U5305";
        },
        {
            icon = qianbao;
            name = "U94b1U5305";
        })*/
        
        // 字典转模型对象
        // 创建临时数组
        NSMutableArray *tempArray = [NSMutableArray array];
        for (NSDictionary *dict in _dataArr) {
            // 创建shop对象
            /*
//            XMGShop *shop = [[XMGShop alloc] initWithIcon:dict[@"icon"] name:dict[@"name"]];
//            XMGShop *shop = [XMGShop shopWithIcon:dict[@"icon"] name:dict[@"name"]];
//            shop.name = dict[@"name"];
//            shop.icon = dict[@"icon"];
             */
            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];
   /*类前缀
    // Foundation
    NSString;
    NSArray;
    NSDictionary;
    NSURL;
    
    // UIKit
    UIView;
    UIImageView;
    UISwitch;
    */
}

/**
 *  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*****************************/
    // 设置数据
    XMGShop *shop = self.dataArr[index];
    iconView.image = [UIImage imageNamed:shop.icon];
    titleLabel.text = shop.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

//
//  XMGShop.h

#import <Foundation/Foundation.h>

@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

#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];
}
*/

/*构造方法，一般一共对象方法和类方法*/

- (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];//self alloc创建了一个类对象。
}

@end