用OC和UI实现购物车功能 在iOS平台上
购物车项目
作用：可以通过按钮把物品简单的添加到购物车中
思路：
一，设置两个加减按钮，有普通，高亮和enable状态，在interface中有属性声明
二，设置购物车的imageview，在interface中有属性声明
三，设置数组装载字典对象，字典里包含物品图片的名字和物品标题，写入一个plist文件中，然后放到singel view application的support file中
四，创建两个类，分别是Shop（继承于NSObject）和ShopView（继承于UIView）。Shop用于从数组获取图片的名字和标题；ShopView用于设置图片的frame和标题。
五，设置九宫格，用添加的图片个数作为索引，计算出每个图片的距离以及需要换行的数量.
大致如图
-----------------------------------LHJViewController.m中代码实现------------------------------------
//
// LHJViewController.m
// 购物车
//
// Created by 梁华建 on 2017/9/19.
// Copyright © 2017年 梁华建. All rights reserved.
//
#import "LHJShop.h"
#import "LHJViewController.h"
@interface LHJViewController ()
//按钮的对象
@property (weak, nonatomic) IBOutlet UIButton *Subtrack;
@property (weak, nonatomic) IBOutlet UIButton *AddButton;
//购物车的image
@property (weak, nonatomic) IBOutlet UIImageView *UICarImage;
@property(nonatomic,strong)NSArray *Arrdic;
@end
@implementation LHJViewController
/********************加载数据进入数组**********************/
-(NSArray *)Arrdic
{
if (_Arrdic==nil) {
//从plist文件中读取字典
NSString *PathForPlist=[[NSBundle mainBundle]pathForResource:@"Arr.plist" ofType:nil];
self.Arrdic=[NSArray arrayWithContentsOfFile:PathForPlist];
//创建可变数组装载Arrdic
NSMutableArray *dict=[[NSMutableArray alloc]init];
//遍历
for (NSDictionary *dic in self.Arrdic) {
LHJShop *shop1=[[LHJShop alloc]initWithDictionary:dic];
[dict addObject:shop1];
}
//把可变数组装进去
self.Arrdic=dict;
}
return _Arrdic;
}
- (void)viewDidLoad {
[super viewDidLoad];
}
//加入购物车按钮
- (IBAction)AddToCar:(UIButton *)sender {
//设置图片数量
NSInteger num=self.UICarImage.subviews.count;
/******************设置九宫格******************/
//列数
NSInteger list=3;
//图片的xy值
CGFloat xwidht=80;
CGFloat yheight=100;
//计算水平间距和垂直间距
CGFloat xw=(self.UICarImage.frame.size.width-list*xwidht)/3;
CGFloat yh=(self.UICarImage.frame.size.height-2*yheight)/1;
//求出x和y的值
CGFloat x=(xwidht+xw)*(num%list);
CGFloat y=(yheight+yh)*(num/list);
/**************添加购物车图****************/
// 取出数据
LHJShop *Shop=self.Arrdic[num];
LHJShopView *LHJshopview=[[LHJShopView alloc]initWithShop:Shop];
LHJshopview.frame=CGRectMake(x,y, xwidht, yheight);
[self.UICarImage addSubview:LHJshopview];
/*-----------------读取数据------------------*/
//设置按钮状态
self.AddButton.enabled=(num!=5);
self.Subtrack.enabled=YES;
}
//去除购物车按钮
- (IBAction)SubtractToCar:(UIButton *)sender{
UIView *lastobject= [self.UICarImage.subviews lastObject];
[lastobject removeFromSuperview];
self.AddButton.enabled=YES;
self.Subtrack.enabled=(self.UICarImage.subviews.count!=0);
}
@end
----------------------------shop中代码（获取字典中的数据）--------------------------
// LHJShop.h
#import <Foundation/Foundation.h>
@interface LHJShop : NSObject
/** 图片的名称*/
@property(nonatomic,copy)NSString *name;
/** 商品的名称*/
@property(nonatomic, copy)NSString *icon;
-(instancetype)initWithDictionary:(NSDictionary *)dic;
+(instancetype)ArrayWithDictionary:(NSDictionary *)dic;
@end
// LHJShop.m
#import "LHJShop.h"
@implementation LHJShop
//设置类工厂和initwith函数 获得并封装字典中的图片名字和图片标题
-(instancetype)initWithDictionary:(NSDictionary *)dic
{
LHJShop *shop=[[LHJShop alloc ]init];
shop.name=dic[@"name"];
shop.icon=dic[@"icon"];
return shop;
}
+(instancetype)ArrayWithDictionary:(NSDictionary *)dic
{
return [[LHJShop alloc]initWithDictionary:dic];
}
@end
// LHJShopView.h
@class LHJShop;
#import <UIKit/UIKit.h>
//自定义控件
//在init初始化子控件
//在layoutSubviews中设置frame
//在外面设置数据
@interface LHJShopView : UIView
@property(nonatomic,strong)LHJShop *Shop;
-(instancetype)initWithShop:(LHJShop *)shop;
+(instancetype)LHJShopViewWithShop:(LHJShop *)shop;
@end
// LHJShopView.m
#import "LHJShopView.h"
#import "LHJShop.h"
@interface LHJShopView ()
//设置图片
@property(nonatomic,weak)UIImageView *imageview;
//设置文字
@property(nonatomic,weak)UILabel *label;
@end
@implementation LHJShopView
-(instancetype)init
{
//设置图片
if(self=[super init])
{
[self SetUp];
}
return self;
}
//定义布局 （设置frame）
-(void)layoutSubviews
{
[super layoutSubviews];
CGFloat xwidht=self.frame.size.width;
CGFloat yheight=self.frame.size.height;
self.imageview.frame=CGRectMake(0,0,xwidht,xwidht);
self.label.frame=CGRectMake(0,xwidht,xwidht,yheight-xwidht);
// NSLog(@"%f------%f",xwidht,yheight);
}
+(instancetype)LHJShopViewWithShop:(LHJShop *)shop
{
return [[self alloc]initWithShop:shop];
}
-(instancetype)initWithShop:(LHJShop *)shop
{
if (self=[super init]) {
[self SetUp];
self.Shop=shop;
}
return self;
}
-(void)setShop:(LHJShop *)Shop
{
_Shop=Shop;
self.imageview.image=[UIImage imageNamed:Shop.name];
self.label.text=Shop.icon;
}
-(void)SetUp
{
//设置imageview
UIImageView *imageview=[[UIImageView alloc]init];
imageview.backgroundColor=[UIColor yellowColor];
[self addSubview:imageview];
_imageview=imageview;
//设置label
UILabel *label=[[UILabel alloc]init];
label.textAlignment=NSTextAlignmentCenter;
label.backgroundColor=[UIColor greenColor];
[self addSubview:label];
_label=label;
}
@end