iOS开发UI篇—简单的浏览器查看程序

iOS开发UI篇—简单的浏览器查看程序

一、程序实现要求

1.要求

iOS开发UI篇—简单的浏览器查看程序

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,strong)UILabel *firstlab;
@property(nonatomic,strong)UILabel *lastlab;
@property(nonatomic,strong)UIImageView *icon;
@property(nonatomic,strong)UIButton *leftbtn;
@property(nonatomic,strong)UIButton *rightbtn; -(void)change;
@property(nonatomic ,assign)int i;
@end @implementation YYViewController - (void)viewDidLoad
{
[super viewDidLoad];
self.i=;
//创建一个用来显示序号的lable控件
UILabel *headlab=[[UILabel alloc]initWithFrame:CGRectMake(, , , )]; // [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(, , , )];
// [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(, self.view.center.y, , );
[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+, self.view.center.y, , );
[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+]];
switch (self.i) {
case :
self.lastlab.text=@"什么表情都弱爆了!";
self.icon.image=[UIImage imageNamed:@"biaoqingdi"];
break;
case :
self.lastlab.text=@"病例";
self.icon.image=[UIImage imageNamed:@"bingli"];
break;
case :
self.lastlab.text=@"王八";
self.icon.image=[UIImage imageNamed:@"wangba"];
break;
case :
self.lastlab.text=@"吃牛扒";
self.icon.image=[UIImage imageNamed:@"chiniupa"];
break;
case :
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!=);
self.rightbtn.enabled=(self.i!=); } //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

三、程序优化

 //
// 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,strong)UILabel *firstlab;
@property(nonatomic,strong)UILabel *lastlab;
@property(nonatomic,strong)UIImageView *icon;
@property(nonatomic,strong)UIButton *leftbtn;
@property(nonatomic,strong)UIButton *rightbtn; @property(nonatomic,strong)NSArray *array; -(void)change;
@property(nonatomic ,assign)int i;
@end @implementation YYViewController - (void)viewDidLoad
{
[super viewDidLoad];
self.i=;
//创建一个用来显示序号的lable控件
UILabel *headlab=[[UILabel alloc]initWithFrame:CGRectMake(, , , )]; // [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(, , , )];
// [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(, self.view.center.y, , );
[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+, self.view.center.y, , );
[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];
//放在这里的话,只会创建一次,但是这个部分和[self change];部分有很严格的顺序要求,并不人性化,可以考虑使用懒加载特性
// NSDictionary *dict1=@{@"name": @"biaoqingdi",@"desc":@"什么表情都弱爆了!"};
// NSDictionary *dict2=@{@"name": @"bingli",@"desc":@"病例"};
// NSDictionary *dict3=@{@"name": @"wangba",@"desc":@"乌龟"};
// NSDictionary *dict4=@{@"name": @"chiniupa",@"desc":@"吃牛扒"};
// NSDictionary *dict5=@{@"name": @"danteng",@"desc":@"蛋疼"};
//
// self.array=@[dict1,dict2,dict3,dict4,dict5];
//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
{
//每次调用都需要创建?有没有什么解决办法?
// NSDictionary *dict1=@{@"name": @"biaoqingdi",@"desc":@"什么表情都弱爆了!"};
// NSDictionary *dict2=@{@"name": @"bingli",@"desc":@"病例"};
// NSDictionary *dict3=@{@"name": @"wangba",@"desc":@"乌龟"};
// NSDictionary *dict4=@{@"name": @"chiniupa",@"desc":@"吃牛扒"};
// NSDictionary *dict5=@{@"name": @"danteng",@"desc":@"蛋疼"};
//
// NSArray *array=@[dict1,dict2,dict3,dict4,dict5]; //设置照片
//先根据self.i取出数组中的元素,再取出元素(字典)中键值对应的值
// self.icon.image=[UIImage imageNamed:array[self.i][@"name"]];
// self.lastlab.text=array[self.i][@"desc"];
// NSLog(@"%@",array[self.i][@"desc"]); self.icon.image=[UIImage imageNamed:self.array[self.i][@"name"]];
self.lastlab.text=self.array[self.i][@"desc"]; [self.firstlab setText:[NSString stringWithFormat:@"%d/5",self.i+]]; // 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!=);
self.rightbtn.enabled=(self.i!=); } //array的get方法
-(NSArray *)array
{
NSLog(@"需要获取数组");
//只实例化一次
if (_array==nil) {
NSLog(@"实例化数组");
NSDictionary *dict1=@{@"name": @"biaoqingdi",@"desc":@"什么表情都弱爆了!"};
NSDictionary *dict2=@{@"name": @"bingli",@"desc":@"病例"};
NSDictionary *dict3=@{@"name": @"wangba",@"desc":@"乌龟"};
NSDictionary *dict4=@{@"name": @"chiniupa",@"desc":@"吃牛扒"};
NSDictionary *dict5=@{@"name": @"danteng",@"desc":@"蛋疼"};
_array=@[dict1,dict2,dict3,dict4,dict5];
}
// NSDictionary *dict1=@{@"name": @"biaoqingdi",@"desc":@"什么表情都弱爆了!"};
// NSDictionary *dict2=@{@"name": @"bingli",@"desc":@"病例"};
// NSDictionary *dict3=@{@"name": @"wangba",@"desc":@"乌龟"};
// NSDictionary *dict4=@{@"name": @"chiniupa",@"desc":@"吃牛扒"};
// NSDictionary *dict5=@{@"name": @"danteng",@"desc":@"蛋疼"}; // _array=@[dict1,dict2,dict3,dict4,dict5];
return _array;
} //向右按键
-(void)rightclick:(UIButton *)btn
{
self.i++;
[self change];
} //向左按键
-(void)leftclick:(UIButton *)btn
{
self.i--;
[self change];
} - (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
} @end

说明:

1> 定义控件属性,注意:属性必须是strong的,示例代码如下:

@property (nonatomic, strong) UIImageView *icon;

2> 在属性的getter方法中实现懒加载,示例代码如下:

 - (UIImageView *)icon

 {

     if (!_icon) {

         // 计算位置参数

         CGFloat imageW = ;

         CGFloat imageX = ( - imageW) / ;

         CGFloat imageH = ;

         CGFloat imageY = ;

         // 实例化图像视图

         _icon = [[UIImageView alloc] initWithFrame:CGRectMake(imageX, imageY, imageW, imageH)];

         // 将图像视图添加到主视图

         [self.view addSubview:_icon];

     }

     return _icon;

 }

四、使用plist文件

(1)使用Plist文件的目的:将数据与代码分离

(2)加载方法:

NSString *path = [[NSBundle mainBundle] pathForResource:@"ImageData" ofType:@"plist"];

_imageList = [NSArray arrayWithContentsOfFile:path];

提示:通常在方法中出现File字眼,通常需要传递文件的全路径作为参数

(3)代码示例

 //
// 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,strong)UILabel *firstlab;
@property(nonatomic,strong)UILabel *lastlab;
@property(nonatomic,strong)UIImageView *icon;
@property(nonatomic,strong)UIButton *leftbtn;
@property(nonatomic,strong)UIButton *rightbtn; @property(nonatomic,strong)NSArray *array; -(void)change;
@property(nonatomic ,assign)int i;
@end @implementation YYViewController - (void)viewDidLoad
{
[super viewDidLoad];
self.i=;
//创建一个用来显示序号的lable控件
UILabel *headlab=[[UILabel alloc]initWithFrame:CGRectMake(, , , )]; // [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(, , , )];
// [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(, self.view.center.y, , );
[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+, self.view.center.y, , );
[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];
[self change];
} -(void)change
{
self.icon.image=[UIImage imageNamed:self.array[self.i][@"name"]];
self.lastlab.text=self.array[self.i][@"desc"]; [self.firstlab setText:[NSString stringWithFormat:@"%d/5",self.i+]]; self.leftbtn.enabled=(self.i!=);
self.rightbtn.enabled=(self.i!=); } //array的get方法
-(NSArray *)array
{
NSLog(@"需要获取数组");
//只实例化一次
if (_array==nil) { NSString *path=[[NSBundle mainBundle] pathForResource:@"data" ofType:@"plist"];
//数组的数据从文件获取
// _array=[NSArray arrayWithContentsOfFile:path];
_array=[[NSArray alloc]initWithContentsOfFile:path];
//打印查看包的位置
NSLog(@"%@",path); NSLog(@"实例化数组");
} return _array;
} //向右按键
-(void)rightclick:(UIButton *)btn
{
self.i++;
[self change];
} //向左按键
-(void)leftclick:(UIButton *)btn
{
self.i--;
[self change];
} - (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
} @end

(4)plist文件

iOS开发UI篇—简单的浏览器查看程序

(5)实现效果

iOS开发UI篇—简单的浏览器查看程序

五、补充

开发思路:

1.完成基本功能

2.考虑性能

(1)(初始化操作,可以直接调用change进行)

(2)因为要控制序号和图片两个变量,所以考虑使用字典代替掉switch

(3)每次点击,字典都需要创建一次,效率地下,可以考虑创建的这部分拿到初始化方法中去,这样就只需要创建一次就ok了。

(4)考虑缺点(对代码的顺序要求极其严格)

(5)懒加载(需要的时候才加载,那么什么时候是需要的时候,及调用get方法的时候)

(6)每次都来一下?效率低下—》只有第一次调用get方法时为空,此时实例化并建立数组,其他时候直接返回成员变量(仅仅执行一次)

注意点:

1.方法的调用堆栈(顺序)。

2.使用plist:让数据的操作更加灵活,把数据弄到外面去,解除耦合性,让耦合性不要太强。实际上是一个xml,是苹果定义的一种特殊格式的xml。

3.bundle-包(只读)

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