需求
1.以N宫格的形式展示应用信息
2.APP信息包括图标、名字、下载按钮
3.使用尽可能少的代码，从plist读取app信息，计算每个app图标的位置尺寸信息
A.思路
1.UI布局：N宫格
2.事件监听
3.动态添加 (by plist)
4.整体封装，组合每个应用信息，使用View的层级包装帮助布局
B.实现 (使用纯代码方式)
1 //
2 // ViewController.m
3 // 01-应用管理
4 //
5 // Created by hellovoidworld on 14/11/24.
6 // Copyright (c) 2014年 hellovoidworld. All rights reserved.
7 //
8
9 #import "ViewController.h"
10
11 #define APP_WIDTH 85
12 #define APP_HEIGHT 90
13 #define MARGIN_HEAD 20
14 #define ICON_WIDTH 50
15 #define ICON_HEIGHT 50
16 #define NAME_WIDTH APP_WIDTH
17 #define NAME_HEIGHT 20
18 #define DOWNLOAD_WIDTH (APP_WIDTH - 20)
19 #define DOWNLOAD_HEIGHT 20
20
21 @interface ViewController ()
22
23 /** 存放应用信息 */
24 @property(nonatomic, strong) NSArray *apps; // 应用列表
25
26 @end
27
28 @implementation ViewController
29
30 - (void)viewDidLoad {
31 [super viewDidLoad];
32 // Do any additional setup after loading the view, typically from a nib.
33
34 [self loadApps];
35 }
36
37 - (void)didReceiveMemoryWarning {
38 [super didReceiveMemoryWarning];
39 // Dispose of any resources that can be recreated.
40 }
41
42 #pragma mark 取得应用列表
43 - (NSArray *) apps {
44 if (nil == _apps) {
45 NSString *path = [[NSBundle mainBundle] pathForResource:@"app.plist" ofType:nil];
46 _apps = [NSArray arrayWithContentsOfFile:path];
47 }
48
49 return _apps;
50 }
51
52 #pragma mark 加载全部应用列表
53 - (void) loadApps {
54 int appColumnCount = [self appColumnCount];
55 int appRowCount = [self appRowCount];
56
57 CGFloat marginX = (self.view.frame.size.width - APP_WIDTH * appColumnCount) / (appColumnCount + 1);
58 CGFloat marginY = (self.view.frame.size.height - APP_HEIGHT * appRowCount) / (appRowCount + 1) + MARGIN_HEAD;
59
60 int column = 0;
61 int row = 0;
62 for (int index=0; index<self.apps.count; index++) {
63 NSDictionary *appData = self.apps[index];
64
65 // 每个app信息
66 UIView *appView = [[UIView alloc] init];
67
68 CGFloat appX = marginX + column * (marginX + APP_WIDTH);
69 CGFloat appY = marginY + row * (marginY + APP_HEIGHT);
70
71 appView.frame = CGRectMake(appX, appY, APP_WIDTH, APP_HEIGHT);
72
73 // 1.设置APP图片
74 UIImageView *iconView = [[UIImageView alloc] init];
75
76 CGFloat iconMarginX = (appView.frame.size.width - ICON_WIDTH) / 2;
77 CGFloat iconMarginY = 0;
78 iconView.frame = CGRectMake(iconMarginX, iconMarginY, ICON_WIDTH, ICON_HEIGHT);
79
80 iconView.image = [UIImage imageNamed:appData[@"icon"]];
81 [appView addSubview:iconView];
82
83 // 2.设置APP名字
84 UILabel *nameLabel = [[UILabel alloc] init];
85 nameLabel.text = appData[@"name"];
86 CGFloat nameMarginX = (appView.frame.size.width - NAME_WIDTH) / 2;
87 CGFloat nameMarginY = iconMarginY + ICON_HEIGHT;
88 nameLabel.frame = CGRectMake(nameMarginX, nameMarginY, NAME_WIDTH, NAME_HEIGHT);
89 [nameLabel setFont:[UIFont systemFontOfSize:16]];
90 [nameLabel setTextAlignment:NSTextAlignmentCenter];
91 [appView addSubview:nameLabel];
92
93 // 3.设置下载按钮
94 UIButton *downloadButton = [UIButton buttonWithType:UIButtonTypeCustom];
95 CGFloat downloadMarginX = (appView.frame.size.width - DOWNLOAD_WIDTH) / 2;
96 CGFloat downloadMarginY = nameMarginY + NAME_HEIGHT;
97 downloadButton.frame = CGRectMake(downloadMarginX, downloadMarginY, DOWNLOAD_WIDTH, DOWNLOAD_HEIGHT);
98
99 UIImage *downloadNormalImage = [UIImage imageNamed:@"buttongreen"];
100 [downloadButton setBackgroundImage:downloadNormalImage forState:UIControlStateNormal];
101
102 UIImage *downloadHighlightedImage = [UIImage imageNamed:@"buttongreen_highlighted"];
103 [downloadButton setBackgroundImage:downloadHighlightedImage forState:UIControlStateHighlighted];
104
105 [downloadButton setTitle:@"下载" forState:UIControlStateNormal];
106
107 // 不要直接取出titleLabel属性进行操作，因为这样就不能为全部状态进行设置
108 [downloadButton.titleLabel setFont:[UIFont systemFontOfSize:13]];
109
110 [appView addSubview:downloadButton];
111
112
113 [self.view addSubview:appView];
114
115 column++;
116 if (column == appColumnCount) {
117 column = 0;
118 row++;
119 }
120 }
121 }
122
123 #pragma mark 计算列数
124 - (int) appColumnCount {
125 int count = 0;
126 count = self.view.frame.size.width / APP_WIDTH;
127
128 if ((int)self.view.frame.size.width % (int)APP_WIDTH == 0) {
129 count--;
130 }
131
132 return count;
133 }
134
135 #pragma mark 计算行数
136 - (int) appRowCount {
137 int count = 0;
138 count = (self.view.frame.size.height - MARGIN_HEAD) / APP_HEIGHT;
139
140 if ((int)(self.view.frame.size.height - MARGIN_HEAD) % (int)APP_HEIGHT == 0) {
141 count--;
142 }
143
144 return count;
145 }
146 @end
#1. 放入了Images.xcassets中的文件只能通过[UIImage imageNamed:(NSString *) imageName] 访问吗?