标签：
一、程序实现要求
1.要求
2. 界面分析
（1） 需要读取或修改属性的控件需要设置属性
序号标签
图片
图片描述
左边按钮
右边按钮
（2） 需要监听响应事件的对象，需要添加监听方法
左边按钮
右边按钮
二、实现基本功能的程序
1 //
2 // YYViewController.m
3 // 03-图片浏览器初步
4 //
5 // Created by apple on 14-5-21.
6 // Copyright (c) 2014年 itcase. All rights reserved.
7 //
8
9 #import "YYViewController.h"
10
11 #define POTOIMGW 200
12 #define POTOIMGH 300
13 #define POTOIMGX 60
14 #define POTOIMGY 50
15
16
17 @interface YYViewController ()
18
19 //变量声明！
20 @property(nonatomic,strong)UILabel *firstlab;
21 @property(nonatomic,strong)UILabel *lastlab;
22 @property(nonatomic,strong)UIImageView *icon;
23 @property(nonatomic,strong)UIButton *leftbtn;
24 @property(nonatomic,strong)UIButton *rightbtn;
25
26 -(void)change;
27 @property(nonatomic ,assign)int i;
28 @end
29
30 @implementation YYViewController
31
32 - (void)viewDidLoad
33 {
34 [super viewDidLoad];
35 self.i=0;
36 //创建一个用来显示序号的lable控件
37 UILabel *headlab=[[UILabel alloc]initWithFrame:CGRectMake(20, 10, 300, 30)];
38
39 // [headlab setText:@"1/5"];
40 [headlab setTextAlignment:NSTextAlignmentCenter];
41 [headlab setTextColor:[UIColor blackColor]];
42
43 [self.view addSubview:headlab];
44 self.firstlab=headlab;
45
46
47
48 //创建一个装载图片的控件
49 UIImageView *potoimg=[[UIImageView alloc]initWithFrame:CGRectMake(POTOIMGX, POTOIMGY, POTOIMGW, POTOIMGH)];
50
51 UIImage *image=[UIImage imageNamed:@"biaoqingdi"];
52 potoimg.image=image;
53
54 [self.view addSubview:potoimg];
55 self.icon=potoimg;
56
57
58
59 //创建最下边的描述图片的lable控件
60 UILabel *desclab=[[UILabel alloc]initWithFrame:CGRectMake(20, 400, 300, 30)];
61 // [desclab setText:@"表情弱爆了！"];
62 [desclab setTextAlignment:NSTextAlignmentCenter];
63 [self.view addSubview:desclab];
64 self.lastlab=desclab;
65
66
68 //创建两个方向键按钮
69 //设置为自定义类型
70 //1.使用类创建对象
71 UIButton *leftbtn=[UIButton buttonWithType:UIButtonTypeCustom];
72
73 //2.设置对象的属性（不要忘记设置坐标）
74 leftbtn.frame=CGRectMake(0, self.view.center.y, 40, 40);
75 [leftbtn setBackgroundImage:[UIImage imageNamed:@"left_normal"] forState:UIControlStateNormal];
76 [leftbtn setBackgroundImage:[UIImage imageNamed:@"left_highlighted"] forState:UIControlStateHighlighted];
77
78 //3.提交对象到视图
79 [self.view addSubview:leftbtn];
80
81 self.leftbtn=leftbtn;
82 [leftbtn addTarget:self action:@selector(leftclick:) forControlEvents:UIControlEventTouchUpInside];
83
84
85 UIButton *rightbtn=[UIButton buttonWithType:UIButtonTypeCustom];
86
87 rightbtn.frame=CGRectMake(POTOIMGX+POTOIMGW+10, self.view.center.y, 40, 40);
88 [rightbtn setBackgroundImage:[UIImage imageNamed:@"right_normal"] forState:UIControlStateNormal];
89 [rightbtn setBackgroundImage:[UIImage imageNamed:@"right_highlighted"] forState:UIControlStateHighlighted];
90
91 [self.view addSubview:rightbtn];
92
93 self.rightbtn=rightbtn;
94 [rightbtn addTarget:self action:@selector(rightclick:) forControlEvents:UIControlEventTouchUpInside];
95
96 //这是一个初始化方法，调用change可以完成初始化的工作
97 [self change];
98 }
99
100 -(void)change
101 {
102 [self.firstlab setText:[NSString stringWithFormat:@"%d/5",self.i+1]];
103 switch (self.i) {
104 case 0:
105 self.lastlab.text=@"什么表情都弱爆了！";
106 self.icon.image=[UIImage imageNamed:@"biaoqingdi"];
107 break;
108 case 1:
109 self.lastlab.text=@"病例";
110 self.icon.image=[UIImage imageNamed:@"bingli"];
111 break;
112 case 2:
113 self.lastlab.text=@"王八";
114 self.icon.image=[UIImage imageNamed:@"wangba"];
115 break;
116 case 3:
117 self.lastlab.text=@"吃牛扒";
118 self.icon.image=[UIImage imageNamed:@"chiniupa"];
119