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
(2) 需要监听响应事件的对象,需要添加监听方法
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=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
// // 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=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:
@property (nonatomic, strong) UIImageView *icon;
- (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;
}
(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];
(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=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
(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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