源码-03-封装

  1 #import "ViewController.h"
  2 #import "XMGShop.h"
  3 
  4 @interface ViewController ()
  5 /** 存放所有商品的整体 */
  6 @property (weak, nonatomic) IBOutlet UIView *shopsView;
  7 
  8 /** HUD */
  9 @property (weak, nonatomic) IBOutlet UILabel *hud;
 10 
 11 // 文档注释
 12 /** 添加按钮 */
 13 @property (weak, nonatomic) UIButton *addBtn;
 14 /** 删除按钮 */
 15 @property (weak, nonatomic) UIButton *removeBtn;
 16 
 17 /** 全部商品数据 */
 18 @property (strong, nonatomic) NSArray *shops;
 19 @end
 20 
 21 @implementation ViewController
 22 
 23 // 加载plist数据（比较大）
 24 // 懒加载：用到时再去加载，而且也只加载一次
 25 - (NSArray *)shops
 26 {
 27     if (_shops == nil) {
 28         // 加载一个字典数组
 29         NSArray *dictArray = [NSArray arrayWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"shops" ofType:@"plist"]];
 30         
 31         NSMutableArray *shopArray = [NSMutableArray array];
 32         for (NSDictionary *dict in dictArray) {
 33             XMGShop *shop = [XMGShop shopWithDict:dict];
 34             [shopArray addObject:shop];
 35         }
 36         _shops = shopArray;
 37     }
 38     return _shops;
 39 }
 40 
 41 - (void)viewDidLoad
 42 {
 43     [super viewDidLoad];
 44     
 45     // 添加“添加按钮”
 46     self.addBtn = 。。。 47     
 48     // 添加“删除按钮”
 49     self.removeBtn = 。。。 50     self.removeBtn.enabled = NO;
 51 }
 52 
 53 #pragma mark 添加按钮
 54 - (UIButton *)addButtonWithImage:(NSString *)image highImage:(NSString *)highImage disableImage:(NSString *)disableImage 
　　　　　　　　　　　　　　　　　　frame:(CGRect)frame action:(SEL)action
 55 {
 56     // 创建按钮
 57     UIButton *btn = [[UIButton alloc] init];
 58     // 设置背景图片
 59     [btn setBackgroundImage:[UIImage imageNamed:image] forState:UIControlStateNormal];
 60     [btn setBackgroundImage:[UIImage imageNamed:highImage] forState:UIControlStateHighlighted];
 61     [btn setBackgroundImage:[UIImage imageNamed:disableImage] forState:UIControlStateDisabled];
 62     // 设置位置和尺寸
 63     btn.frame = frame;
 64     // 监听按钮点击
 65     [btn addTarget:self action:action forControlEvents:UIControlEventTouchUpInside];
 66     // 添加按钮
 67     [self.view addSubview:btn];
 68     return btn;
 69 }
 70 
 71 #pragma mark 添加
 72 - (void)add
 73 {
 74     
 75     CGFloat shopW = 80; // 每一个商品的尺寸
 76     CGFloat shopH = 90;
 77   
 78     int cols = 3;   // 一行的列数
 79     
 80     CGFloat colMargin = (self.shopsView.frame.size.width - cols * shopW) / (cols - 1); // 每一列之间的间距
 81     CGFloat rowMargin = 10; // 每一行之间的间距
 82     
 83     UIView *shopView = [[UIView alloc] init];  // 创建一个父控件（整体：存放图片和文字）
 84     shopView.backgroundColor = [UIColor redColor];
 85     
 86     NSUInteger index = self.shopsView.subviews.count;    // 商品的索引
 87     
 88     NSUInteger col = index % cols; // 商品的x值
 89     CGFloat shopX = col * (shopW + colMargin);
 90     
 91     NSUInteger row = index / cols;    // 商品的y值
 92     CGFloat shopY = row * (shopH + rowMargin);
 93     
 94     shopView.frame = CGRectMake(shopX, shopY, shopW, shopH);
 95     [self.shopsView addSubview:shopView];
 96     
 97         // 获得index位置对应的商品数据
 98         //    NSDictionary *dict = self.shops[index];
 99         //    Shop *shop = [Shop shopWithDict:dict];
100         
101     XMGShop *shop = self.shops[index];
102     
103     // 添加图片
104     UIImageView *iconView = [[UIImageView alloc] init];
105     iconView.image = [UIImage imageNamed:shop.icon];
106     iconView.frame = CGRectMake(0, 0, shopW, shopW);
107     iconView.backgroundColor = [UIColor blueColor];
108     [shopView addSubview:iconView];
109     
110     // 添加文字
111     UILabel *label = [[UILabel alloc] init];
112     label.text = shop.name;
113     label.frame = CGRectMake(0, shopW, shopW, shopH - shopW);
114     label.font = [UIFont systemFontOfSize:11];
115     label.textAlignment = NSTextAlignmentCenter;
116     [shopView addSubview:label];
117     
118     // 控制按钮的可用性
119     [self checkState];
120 }
121 
122 #pragma mark 删除
123 - (void)remove
124 {
125     [[self.shopsView.subviews lastObject] removeFromSuperview];
126     
127     // 控制按钮的可用性
128     [self checkState];
129 }
130 
131 #pragma mark 检查状态：按钮状态
132 - (void)checkState
133 {
134     // 删除按钮什么时候可以点击：商品个数 > 0
135     self.removeBtn.enabled = (self.shopsView.subviews.count > 0);
136     // 添加按钮什么时候可以点击：商品个数 < 总数
137     self.addBtn.enabled = (self.shopsView.subviews.count < self.shops.count);
138     
139     // 显示HUD
140     NSString *text = nil;
141     if (self.removeBtn.enabled == NO) { // 删光了
142         text = @"已经全部删除";
143     } else if (self.addBtn.enabled == NO) { // 加满了
144         text = @"已经添加满了";
145     }
146     if (text == nil) return;
147     
148     self.hud.text = text;
149     self.hud.alpha = 1.0;
150     dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
151         self.hud.alpha = 0.0;
152     });
153 }
154 
155 @end

 1 #import <Foundation/Foundation.h>
 2 
 3 @interface XMGShop : NSObject
 4 /** 商品名称 */
 5 @property (nonatomic, strong) NSString *name;
 6 /** 图标 */
 7 @property (nonatomic, strong) NSString *icon;
 8 
 9 - (instancetype)initWithDict:(NSDictionary *)dict;
10 + (instancetype)shopWithDict:(NSDictionary *)dict;
11 @end

 1 #import "XMGShop.h"
 2 
 3 @implementation XMGShop
 4 - (instancetype)initWithDict:(NSDictionary *)dict
 5 {
 6     if (self = [super init]) {
 7         self.name = dict[@"name"];
 8         self.icon = dict[@"icon"];
 9     }
10     return self;
11 }
12 
13 + (instancetype)shopWithDict:(NSDictionary *)dict
14 {
15     return [[self alloc] initWithDict:dict];
16 }
17 @end