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  • 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

    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             break;
    120         case 4:
    121              self.lastlab.text=@"蛋疼!";
    122             self.icon.image=[UIImage imageNamed:@"danteng"];
    123             break;
    124     }
    125     //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
    126     self.leftbtn.enabled=(self.i!=0);
    127     self.rightbtn.enabled=(self.i!=4);
    128 
    129 }
    130 
    131 //向右按键
    132 -(void)rightclick:(UIButton *)btn
    133 {
    134     self.i++;
    135     [self change];
    136     //NSLog(@"点我了");
    137 }
    138 -(void)leftclick:(UIButton *)btn
    139 {
    140     self.i--;
    141     [self change];
    142 }
    143 - (void)didReceiveMemoryWarning
    144 {
    145     [super didReceiveMemoryWarning];
    146     // Dispose of any resources that can be recreated.
    147 }
    148 
    149 @end
    复制代码
    三、程序优化
    
    复制代码
      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 @property(nonatomic,strong)NSArray *array;
     27 
     28 -(void)change;
     29 @property(nonatomic ,assign)int i;
     30 @end
     31 
     32 @implementation YYViewController
     33 
     34 - (void)viewDidLoad
     35 {
     36     [super viewDidLoad];
     37     self.i=0;
     38     //创建一个用来显示序号的lable控件
     39     UILabel *headlab=[[UILabel alloc]initWithFrame:CGRectMake(20, 10, 300, 30)];
     40     
     41   // [headlab setText:@"1/5"];
     42     [headlab setTextAlignment:NSTextAlignmentCenter];
     43     [headlab setTextColor:[UIColor blackColor]];
     44     
     45     [self.view addSubview:headlab];
     46     self.firstlab=headlab;
     47     
     48     
     49     
     50     //创建一个装载图片的控件
     51     UIImageView *potoimg=[[UIImageView alloc]initWithFrame:CGRectMake(POTOIMGX, POTOIMGY, POTOIMGW, POTOIMGH)];
     52     
     53     UIImage *image=[UIImage imageNamed:@"biaoqingdi"];
     54     potoimg.image=image;
     55     
     56     [self.view addSubview:potoimg];
     57     self.icon=potoimg;
     58     
     59     
     60     
     61     //创建最下边的描述图片的lable控件
     62     UILabel *desclab=[[UILabel alloc]initWithFrame:CGRectMake(20, 400, 300, 30)];
     63    // [desclab setText:@"表情弱爆了!"];
     64     [desclab setTextAlignment:NSTextAlignmentCenter];
     65     [self.view addSubview:desclab];
     66     self.lastlab=desclab;
     67     
     68     
     69     
     70     //创建两个方向键按钮
     71     //设置为自定义类型
     72     //1.使用类创建对象
     73     UIButton *leftbtn=[UIButton buttonWithType:UIButtonTypeCustom];
     74     
     75     //2.设置对象的属性(不要忘记设置坐标)
     76     leftbtn.frame=CGRectMake(0, self.view.center.y, 40, 40);
     77     [leftbtn setBackgroundImage:[UIImage imageNamed:@"left_normal"] forState:UIControlStateNormal];
     78     [leftbtn setBackgroundImage:[UIImage imageNamed:@"left_highlighted"] forState:UIControlStateHighlighted];
     79     
     80     //3.提交对象到视图
     81     [self.view addSubview:leftbtn];
     82     
     83     self.leftbtn=leftbtn;
     84     [leftbtn addTarget:self action:@selector(leftclick:) forControlEvents:UIControlEventTouchUpInside];
     85     
     86     
     87     UIButton *rightbtn=[UIButton buttonWithType:UIButtonTypeCustom];
     88     
     89     rightbtn.frame=CGRectMake(POTOIMGX+POTOIMGW+10, self.view.center.y, 40, 40);
     90     [rightbtn setBackgroundImage:[UIImage imageNamed:@"right_normal"] forState:UIControlStateNormal];
     91     [rightbtn setBackgroundImage:[UIImage imageNamed:@"right_highlighted"] forState:UIControlStateHighlighted];
     92     
     93     [self.view addSubview:rightbtn];
     94     
     95     self.rightbtn=rightbtn;
     96     [rightbtn addTarget:self action:@selector(rightclick:) forControlEvents:UIControlEventTouchUpInside];
     97     //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
     98 //    NSDictionary *dict1=@{@"name": @"biaoqingdi",@"desc":@"什么表情都弱爆了!"};
     99 //    NSDictionary *dict2=@{@"name": @"bingli",@"desc":@"病例"};
    100 //    NSDictionary *dict3=@{@"name": @"wangba",@"desc":@"乌龟"};
    101 //    NSDictionary *dict4=@{@"name": @"chiniupa",@"desc":@"吃牛扒"};
    102 //    NSDictionary *dict5=@{@"name": @"danteng",@"desc":@"蛋疼"};
    103 //    
    104 //    self.array=@[dict1,dict2,dict3,dict4,dict5];
    105     //这是一个初始化方法,调用change可以完成初始化的工作
    106     [self change];
    107 }
    108 
    109 -(void)change
    110 {
    111     //每次调用都需要创建?有没有什么解决办法?
    112 //    NSDictionary *dict1=@{@"name": @"biaoqingdi",@"desc":@"什么表情都弱爆了!"};
    113 //    NSDictionary *dict2=@{@"name": @"bingli",@"desc":@"病例"};
    114 //    NSDictionary *dict3=@{@"name": @"wangba",@"desc":@"乌龟"};
    115 //    NSDictionary *dict4=@{@"name": @"chiniupa",@"desc":@"吃牛扒"};
    116 //    NSDictionary *dict5=@{@"name": @"danteng",@"desc":@"蛋疼"};
    117 //    
    118 //    NSArray *array=@[dict1,dict2,dict3,dict4,dict5];
    119     
    120     
    121     //设置照片
    122     //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
    123 //    self.icon.image=[UIImage imageNamed:array[self.i][@"name"]];
    124 //    self.lastlab.text=array[self.i][@"desc"];
    125    // NSLog(@"%@",array[self.i][@"desc"]);
    126     
    127     self.icon.image=[UIImage imageNamed:self.array[self.i][@"name"]];
    128     self.lastlab.text=self.array[self.i][@"desc"];
    129     
    130     [self.firstlab setText:[NSString stringWithFormat:@"%d/5",self.i+1]];
    131     
    132 //    switch (self.i) {
    133 //        case 0:
    134 //            self.lastlab.text=@"什么表情都弱爆了!";
    135 //            self.icon.image=[UIImage imageNamed:@"biaoqingdi"];
    136 //            break;
    137 //        case 1:
    138 //            self.lastlab.text=@"病例";
    139 //            self.icon.image=[UIImage imageNamed:@"bingli"];
    140 //            break;
    141 //        case 2:
    142 //           self.lastlab.text=@"王八";
    143 //            self.icon.image=[UIImage imageNamed:@"wangba"];
    144 //            break;
    145 //        case 3:
    146 //           self.lastlab.text=@"吃牛扒";
    147 //            self.icon.image=[UIImage imageNamed:@"chiniupa"];
    148 //            break;
    149 //        case 4:
    150 //             self.lastlab.text=@"蛋疼!";
    151 //            self.icon.image=[UIImage imageNamed:@"danteng"];
    152 //            break;
    153 //    }
    154     //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
    155     self.leftbtn.enabled=(self.i!=0);
    156     self.rightbtn.enabled=(self.i!=4);
    157 
    158 }
    159 
    160 //array的get方法
    161 -(NSArray *)array
    162 {
    163     NSLog(@"需要获取数组");
    164     //只实例化一次
    165     if (_array==nil) {
    166         NSLog(@"实例化数组");
    167         NSDictionary *dict1=@{@"name": @"biaoqingdi",@"desc":@"什么表情都弱爆了!"};
    168         NSDictionary *dict2=@{@"name": @"bingli",@"desc":@"病例"};
    169         NSDictionary *dict3=@{@"name": @"wangba",@"desc":@"乌龟"};
    170         NSDictionary *dict4=@{@"name": @"chiniupa",@"desc":@"吃牛扒"};
    171         NSDictionary *dict5=@{@"name": @"danteng",@"desc":@"蛋疼"};
    172         _array=@[dict1,dict2,dict3,dict4,dict5];
    173     }
    174 //    NSDictionary *dict1=@{@"name": @"biaoqingdi",@"desc":@"什么表情都弱爆了!"};
    175 //    NSDictionary *dict2=@{@"name": @"bingli",@"desc":@"病例"};
    176 //    NSDictionary *dict3=@{@"name": @"wangba",@"desc":@"乌龟"};
    177 //    NSDictionary *dict4=@{@"name": @"chiniupa",@"desc":@"吃牛扒"};
    178 //    NSDictionary *dict5=@{@"name": @"danteng",@"desc":@"蛋疼"};
    179     
    180    // _array=@[dict1,dict2,dict3,dict4,dict5];
    181     return _array;
    182 }
    183 
    184 //向右按键
    185 -(void)rightclick:(UIButton *)btn
    186 {
    187     self.i++;
    188     [self change];
    189 }
    190 
    191 //向左按键
    192 -(void)leftclick:(UIButton *)btn
    193 {
    194     self.i--;
    195     [self change];
    196 }
    197 
    198 
    199 - (void)didReceiveMemoryWarning
    200 {
    201     [super didReceiveMemoryWarning];
    202 }
    203 
    204 @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:

     
    1 - (UIImageView *)icon
     2 
     3 {
     4 
     5     if (!_icon) {
     6 
     7         // 计算位置参数
     8 
     9         CGFloat imageW = 200;
    10 
    11         CGFloat imageX = (320 - imageW) / 2;
    12 
    13         CGFloat imageH = 200;
    14 
    15         CGFloat imageY = 80;
    16 
    17         // 实例化图像视图
    18 
    19         _icon = [[UIImageView alloc] initWithFrame:CGRectMake(imageX, imageY, imageW, imageH)];
    20 
    21         // 将图像视图添加到主视图
    22 
    23         [self.view addSubview:_icon];
    24 
    25     }
    26 
    27     return _icon;
    28 
    29 }
     

    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

      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 @property(nonatomic,strong)NSArray *array;
     27 
     28 -(void)change;
     29 @property(nonatomic ,assign)int i;
     30 @end
     31 
     32 @implementation YYViewController
     33 
     34 - (void)viewDidLoad
     35 {
     36     [super viewDidLoad];
     37     self.i=0;
     38     //创建一个用来显示序号的lable控件
     39     UILabel *headlab=[[UILabel alloc]initWithFrame:CGRectMake(20, 10, 300, 30)];
     40     
     41   // [headlab setText:@"1/5"];
     42     [headlab setTextAlignment:NSTextAlignmentCenter];
     43     [headlab setTextColor:[UIColor blackColor]];
     44     
     45     [self.view addSubview:headlab];
     46     self.firstlab=headlab;
     47     
     48     
     49     
     50     //创建一个装载图片的控件
     51     UIImageView *potoimg=[[UIImageView alloc]initWithFrame:CGRectMake(POTOIMGX, POTOIMGY, POTOIMGW, POTOIMGH)];
     52     
     53     UIImage *image=[UIImage imageNamed:@"biaoqingdi"];
     54     potoimg.image=image;
     55     
     56     [self.view addSubview:potoimg];
     57     self.icon=potoimg;
     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     
     67     //创建两个方向键按钮
     68     //设置为自定义类型
     69     //1.使用类创建对象
     70     UIButton *leftbtn=[UIButton buttonWithType:UIButtonTypeCustom];
     71     
     72     //2.设置对象的属性(不要忘记设置坐标)
     73     leftbtn.frame=CGRectMake(0, self.view.center.y, 40, 40);
     74     [leftbtn setBackgroundImage:[UIImage imageNamed:@"left_normal"] forState:UIControlStateNormal];
     75     [leftbtn setBackgroundImage:[UIImage imageNamed:@"left_highlighted"] forState:UIControlStateHighlighted];
     76     
     77     //3.提交对象到视图
     78     [self.view addSubview:leftbtn];
     79     
     80     self.leftbtn=leftbtn;
     81     [leftbtn addTarget:self action:@selector(leftclick:) forControlEvents:UIControlEventTouchUpInside];
     82     
     83     
     84     UIButton *rightbtn=[UIButton buttonWithType:UIButtonTypeCustom];
     85     
     86     rightbtn.frame=CGRectMake(POTOIMGX+POTOIMGW+10, self.view.center.y, 40, 40);
     87     [rightbtn setBackgroundImage:[UIImage imageNamed:@"right_normal"] forState:UIControlStateNormal];
     88     [rightbtn setBackgroundImage:[UIImage imageNamed:@"right_highlighted"] forState:UIControlStateHighlighted];
     89     
     90     [self.view addSubview:rightbtn];
     91     
     92     self.rightbtn=rightbtn;
     93     [rightbtn addTarget:self action:@selector(rightclick:) forControlEvents:UIControlEventTouchUpInside];
     94     [self change];
     95 }
     96 
     97 -(void)change
     98 {
     99     self.icon.image=[UIImage imageNamed:self.array[self.i][@"name"]];
    100     self.lastlab.text=self.array[self.i][@"desc"];
    101     
    102     [self.firstlab setText:[NSString stringWithFormat:@"%d/5",self.i+1]];
    103     
    104     self.leftbtn.enabled=(self.i!=0);
    105     self.rightbtn.enabled=(self.i!=4);
    106 
    107 }
    108 
    109 //array的get方法
    110 -(NSArray *)array
    111 {
    112     NSLog(@"需要获取数组");
    113     //只实例化一次
    114     if (_array==nil) {
    115      
    116         NSString *path=[[NSBundle mainBundle] pathForResource:@"data" ofType:@"plist"];
    117         //数组的数据从文件获取
    118        // _array=[NSArray arrayWithContentsOfFile:path];
    119         _array=[[NSArray alloc]initWithContentsOfFile:path];
    120         //打印查看包的位置
    121         NSLog(@"%@",path);
    122         
    123        NSLog(@"实例化数组");
    124     }
    125 
    126     return _array;
    127 }
    128 
    129 //向右按键
    130 -(void)rightclick:(UIButton *)btn
    131 {
    132     self.i++;
    133     [self change];
    134 }
    135 
    136 //向左按键
    137 -(void)leftclick:(UIButton *)btn
    138 {
    139     self.i--;
    140     [self change];
    141 }
    142 
    143 - (void)didReceiveMemoryWarning
    144 {
    145     [super didReceiveMemoryWarning];
    146 }
    147 
    148 @end
    (4)plist文件

    (5)实现效果

    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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  • 原文地址:https://www.cnblogs.com/asd5551680/p/4068357.html
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