iOS开发中实现一个简单的图片浏览器的实例讲解
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
//
// YYViewController.m
// 03-图片浏览器初步
//
// Created by apple on 14-5-21.
// Copyright (c) 2014年 itcase. All rights reserved.
//
#import "YYViewController.h"
#define POTOIMGW 200
#define POTOIMGH 300
#define POTOIMGX 60
#define POTOIMGY 50
@interface YYViewController ()
//变量声明！
@property(nonatomic,span)UILabel *firstlab;
@property(nonatomic,span)UILabel *lastlab;
@property(nonatomic,span)UIImageView *icon;
@property(nonatomic,span)UIButton *leftbtn;
@property(nonatomic,span)UIButton *rightbtn;
-(void)change;
@property(nonatomic ,assign)int i;
@end
@implementation YYViewController
- (void)viewDidLoad
{
[super viewDidLoad];
self.i=0;
//创建一个用来显示序号的lable控件
UILabel *headlab=[[UILabel alloc]initWithFrame:CGRectMake(20, 10, 300, 30)];
// [headlab setText:@"1/5"];
[headlab setTextAlignment:NSTextAlignmentCenter];
[headlab setTextColor:[UIColor blackColor]];
[self.view addSubview:headlab];
self.firstlab=headlab;
//创建一个装载图片的控件
UIImageView *potoimg=[[UIImageView alloc]initWithFrame:CGRectMake(POTOIMGX, POTOIMGY, POTOIMGW, POTOIMGH)];
UIImage *image=[UIImage imageNamed:@"biaoqingdi"];
potoimg.image=image;
[self.view addSubview:potoimg];
self.icon=potoimg;
//创建最下边的描述图片的lable控件
UILabel *desclab=[[UILabel alloc]initWithFrame:CGRectMake(20, 400, 300, 30)];
// [desclab setText:@"表情弱爆了！"];
[desclab setTextAlignment:NSTextAlignmentCenter];
[self.view addSubview:desclab];
self.lastlab=desclab;
//创建两个方向键按钮
//设置为自定义类型
//1.使用类创建对象
UIButton *leftbtn=[UIButton buttonWithType:UIButtonTypeCustom];
//2.设置对象的属性（不要忘记设置坐标）
leftbtn.frame=CGRectMake(0, self.view.center.y, 40, 40);
[leftbtn setBackgroundImage:[UIImage imageNamed:@"left_normal"] forState:UIControlStateNormal];
[leftbtn setBackgroundImage:[UIImage imageNamed:@"left_highlighted"] forState:UIControlStateHighlighted];
//3.提交对象到视图
[self.view addSubview:leftbtn];
self.leftbtn=leftbtn;
[leftbtn addTarget:self action:@selector(leftclick:) forControlEvents:UIControlEventTouchUpInside];
UIButton *rightbtn=[UIButton buttonWithType:UIButtonTypeCustom];
rightbtn.frame=CGRectMake(POTOIMGX+POTOIMGW+10, self.view.center.y, 40, 40);
[rightbtn setBackgroundImage:[UIImage imageNamed:@"right_normal"] forState:UIControlStateNormal];
[rightbtn setBackgroundImage:[UIImage imageNamed:@"right_highlighted"] forState:UIControlStateHighlighted];
[self.view addSubview:rightbtn];
self.rightbtn=rightbtn;
[rightbtn addTarget:self action:@selector(rightclick:) forControlEvents:UIControlEventTouchUpInside];
//这是一个初始化方法，调用change可以完成初始化的工作
[self change];
}
-(void)change
{
[self.firstlab setText:[NSString stringWithFormat:@"%d/5",self.i+1]];
switch (self.i) {
case 0:
self.lastlab.text=@"什么表情都弱爆了！";
self.icon.image=[UIImage imageNamed:@"biaoqingdi"];
break;
case 1:
self.lastlab.text=@"病例";
self.icon.image=[UIImage imageNamed:@"bingli"];
break;
case 2:
self.lastlab.text=@"王八";
self.icon.image=[UIImage imageNamed:@"wangba"];
break;
case 3:
self.lastlab.text=@"吃牛扒";
self.icon.image=[UIImage imageNamed:@"chiniupa"];
break;
case 4:
self.lastlab.text=@"蛋疼！";
self.icon.image=[UIImage imageNamed:@"danteng"];
break;
}
//控制按钮的点击，如果为5则右键失效，如果为1，则左键失效
self.leftbtn.enabled=(self.i!=0);
self.rightbtn.enabled=(self.i!=4);
}
//向右按键
-(void)rightclick:(UIButton *)btn
{
self.i++;
[self change];
//NSLog(@"点我了");
}
-(void)leftclick:(UIButton *)btn
{
self.i--;
[self change];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
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