iOS开发图片浏览制作

释放双眼,带上耳机,听听看~!

 

一、程序实现要求

1.要求

201611392120159.png (663×410)

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

复制代码 代码如下:
//
//  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=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

 

三、程序优化

复制代码 代码如下:

说明:

//
//  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

复制代码 代码如下:

@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];
    //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+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);

}

//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

 

1> 定义控件属性,注意:属性必须是strong的,示例代码如下:

复制代码 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:

复制代码 代码如下:
- (UIImageView *)icon

{

    if (!_icon) {

        // 计算位置参数

        CGFloat imageW = 200;

        CGFloat imageX = (320 - imageW) / 2;

        CGFloat imageH = 200;

        CGFloat imageY = 80;

        // 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:

复制代码 代码如下:
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

复制代码 代码如下:
//
//  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

 

复制代码 代码如下:
@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];
    [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+1]];
   
    self.leftbtn.enabled=(self.i!=0);
    self.rightbtn.enabled=(self.i!=4);

}

//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

201611392221000.png (868×338)

(5)实现效果

201611392239226.png (640×960)

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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