ios18---自定义控件3改进

控制器：

//  XMGViewController.h

#import <UIKit/UIKit.h>

@interface XMGViewController : UIViewController

@end

//  XMGViewController.m

#import "XMGViewController.h"
#import "XMGShop.h"
#import "XMGShopView.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,get方法
 */
- (NSArray *)dataArr{
    if (_dataArr == nil) {
        // 加载数据
        // 1.获取全路径
        NSString *dataPath = [[NSBundle mainBundle] pathForResource:@"shopData.plist" ofType:nil];
        self.dataArr = [NSArray arrayWithContentsOfFile:dataPath];
        // 字典转模型
        // 创建临时数组
        NSMutableArray *tempArray = [NSMutableArray array];
        for (NSDictionary *dict in _dataArr) {
            // 创建shop对象
            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];
}

/**
 *  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*****************************/
   /*
    XMGShopView *shopView = [[XMGShopView alloc] init];
    shopView.frame = CGRectMake(x, y, width, height);
    // 设置数据
     XMGShop *shop = self.dataArr[index];
    shopView.shop = shop;
    [self.shopCarView addSubview:shopView];
    */

    XMGShopView *shopView = [XMGShopView shopViewWithShop:self.dataArr[index]];
    shopView.frame = CGRectMake(x, y, width, height);
    [self.shopCarView addSubview:shopView];

/***********************3.设置数据*****************************/
    // 设置数据
//    XMGShop *shop = self.dataArr[index];
//    [shopView setIcon:shop.icon];
//    [shopView setName:shop.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
    self.removeButton.enabled = (self.shopCarView.subviews.count != );

}
@end

自定义控件：

//  XMGShopView.h

#import <UIKit/UIKit.h>
@class XMGShop;

@interface XMGShopView : UIView

/** 商品模型 */
@property (nonatomic, strong) XMGShop *shop;

// 构造方法
- (instancetype)initWithShop: (XMGShop *)shop;
+ (instancetype)shopViewWithShop: (XMGShop *)shop;

@end

//  XMGShopView.m

#import "XMGShopView.h"
#import "XMGShop.h"

@interface XMGShopView ()
/** 图片控件 */
@property (nonatomic, weak) UIImageView *iconView;
/** 标题控件 */
@property (nonatomic, weak) UILabel *titleLabel;
@end

@implementation XMGShopView

/**
 *  初始化子控件(不要设置frame)
 *
 */
- (instancetype)init{
    if (self = [super init]) {
        [self setUp];
    }
    return self;
}

//构造方法，对象方法
- (instancetype)initWithShop:(XMGShop *)shop{
    if (self = [super init]) {
        // 注意:先创建后赋值，不然空指针，
        [self setUp];
        self.shop = shop;//调用set方法
    }
    return self;
}
//构造方法，类方法
+ (instancetype)shopViewWithShop:(XMGShop *)shop{
    return [[self alloc] initWithShop:shop];
}

/**
 *  初始化
 */
- (void)setUp{
    // 1.创建商品的UIImageView对象
    UIImageView *iconView = [[UIImageView alloc] init];
    iconView.backgroundColor = [UIColor blueColor];
    [self addSubview:iconView];
    _iconView = iconView;

    // 2.创建商品标题对象
    UILabel *titleLabel = [[UILabel alloc] init];
    titleLabel.backgroundColor = [UIColor yellowColor];
    titleLabel.textAlignment = NSTextAlignmentCenter; // 居中
    [self addSubview:titleLabel];
    _titleLabel = titleLabel;
}

/**
 *  布局子控件(可以拿到frame)
 */
- (void)layoutSubviews{
    // 0.一定要调用super
    [super layoutSubviews];

    // 1.获取当前控件的尺寸
    CGFloat width = self.frame.size.width;
    CGFloat height = self.frame.size.height;

    // 2.设置子控件的frame
     self.iconView.frame = CGRectMake(, , width, width);
     self.titleLabel.frame = CGRectMake(, width, width, height - width);
}

/**
 *  重写set方法:只要外边传数据就会调用
 *  作用:设置数据
 */
- (void)setShop:(XMGShop *)shop{
    _shop = shop;

    // 设置数据
    self.iconView.image = [UIImage imageNamed:shop.icon];
    self.titleLabel.text = shop.name;
}

@end

bean:

//  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];
}
 */

- (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];
}

@end