Image browser(demo15.03.14)
这是一个图片浏览的程序，是传智公开课的一个demo
代码如下
//
// ViewController.m
// ImageBroswer
//
// Created by xin on 15-3-12.
// Copyright (c) 2015年 Jackey. All rights reserved.
//
#import "ViewController.h"
@interface ViewController ()
//序号标签
@property (nonatomic,strong) UILabel *noLabel;
//图片
@property (nonatomic,strong) UIImageView *icon;
//图片描述
@property (nonatomic,strong) UILabel *descriptionLabel;
//左边按钮
@property (nonatomic,strong) UIButton *leftButton;
//右边按钮
@property (nonatomic,strong) UIButton *rightButton;
//image index
@property (nonatomic,assign) int index;//不带星号 assign
@property (nonatomic,strong) NSArray *array;
//@property
// 1 setter getter
// 2 带下划线的成员变量
@end
@implementation ViewController
//array getter
-(NSArray *)array{
//只有第一次调用getter的时候才会执行
//其他时候直接返回
if(_array==nil){
NSDictionary *dic1 = @{@"name":@"biaoqingdi",@"desc":@"表情"};
NSDictionary *dic2 = @{@"name":@"bingli",@"desc":@"病例"};
NSDictionary *dic3 = @{@"name":@"chiniupa",@"desc":@"吃牛扒"};
NSDictionary *dic4 = @{@"name":@"danteng",@"desc":@"蛋疼"};
NSDictionary *dic5 = @{@"name":@"wangba",@"desc":@"王八"};
_array = @[dic1,dic2,dic3,dic4,dic5];
}
return _array;
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
//标签描述
UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(0, 20, 320, 40)];
//label.text = @"1/5";
label.textAlignment = NSTextAlignmentCenter;
[self.view addSubview:label];
self.noLabel = label;
//图片
UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(60, 70, 200, 200)];
//imageView.image = [UIImage imageNamed:@"biaoqingdi"];
[self.view addSubview:imageView];
self.icon = imageView;
//图片描述
UILabel *iconLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 300, 320, 80)];
//iconLabel.text = @"什么表情都弱爆了";
iconLabel.textAlignment = NSTextAlignmentCenter;
[self.view addSubview:iconLabel];
self.descriptionLabel = iconLabel;
//left icon
UIButton *leftBtn = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 40, 40)];
leftBtn.center = CGPointMake(self.icon.frame.origin.x/2, self.icon.center.y);
[leftBtn setBackgroundImage:[UIImage imageNamed:@"left_normal"] forState:UIControlStateNormal];
[self.view addSubview:leftBtn];
[leftBtn addTarget:self action:@selector(leftClick) forControlEvents:UIControlEventTouchUpInside];
self.leftButton = leftBtn;
//right btn
UIButton *rightBtn = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 40, 40)];
rightBtn.center = CGPointMake(self.view.frame.size.width- self.icon.frame.origin.x/2, self.icon.center.y);
[rightBtn setBackgroundImage:[UIImage imageNamed:@"right_normal"] forState:UIControlStateNormal];
[self.view addSubview:rightBtn];
[rightBtn addTarget:self action:@selector(rightClick) forControlEvents:UIControlEventTouchUpInside];
self.rightButton = rightBtn;
[self changeImage];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/** 改变图像数据 */
-(void)changeImage{
self.noLabel.text = [NSString stringWithFormat:@"%d/%d",self.index+1,5];
self.icon.image = [UIImage imageNamed:self.array[self.index][@"name"]];
self.descriptionLabel.text = self.array[self.index][@"desc"];
self.rightButton.enabled = (self.index !=4);
self.leftButton.enabled = (self.index!=0);
}
/** 左边按钮 */
-(void)leftClick{
NSLog(@"left");
self.index--;
[self changeImage];
}
-(void)rightClick{
NSLog(@"right");
self.index++;
[self changeImage];
}
@end
优化代码，使用懒加载
//
// ViewController.m
// ImageBroswer
//
// Created by xin on 15-3-12.
// Copyright (c) 2015年 Jackey. All rights reserved.
//
#import "ViewController.h"
@interface ViewController ()
//序号标签
@property (nonatomic,strong) UILabel *noLabel;
//图片
@property (nonatomic,strong) UIImageView *icon;
//图片描述
@property (nonatomic,strong) UILabel *descriptionLabel;
//左边按钮
@property (nonatomic,strong) UIButton *leftButton;
//右边按钮
@property (nonatomic,strong) UIButton *rightButton;
//image index
@property (nonatomic,assign) int index;//不带星号 assign
@property (nonatomic,strong) NSArray *array;
//@property
// 1 setter getter
// 2 带下划线的成员变量
@end
@implementation ViewController
//array getter
-(NSArray *)array{
//只有第一次调用getter的时候才会执行
//其他时候直接返回
if(_array==nil){
NSString *path = [[NSBundle mainBundle] pathForResource:@"ImageData" ofType:@"plist"];
_array= [NSArray arrayWithContentsOfFile:path];
}
return _array;
}
-(UILabel *)noLabel{
if(_noLabel==nil){
_noLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 20, 320, 40)];
_noLabel.textAlignment = NSTextAlignmentCenter;
[self.view addSubview:_noLabel];
}
return _noLabel;
}
-(UIImageView *)icon{
if(_icon==nil){
_icon = [[UIImageView alloc]initWithFrame:CGRectMake(60, 70, 200, 200)];
[self.view addSubview:_icon];
}
return _icon;
}
-(UILabel *)descriptionLabel{
if(_descriptionLabel==nil){
_descriptionLabel = [[UILabel alloc]initWithFrame:CGRectMake(0, 300, 320, 80)];
_descriptionLabel.numberOfLines = 0;
_descriptionLabel.textAlignment = NSTextAlignmentCenter;
[self.view addSubview:_descriptionLabel];
}
return _descriptionLabel;
}
-(UIButton *)leftButton{
if(_leftButton==nil){
_leftButton = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 40, 40)];
_leftButton.center = CGPointMake(self.icon.frame.origin.x/2, self.icon.center.y);
[_leftButton setBackgroundImage:[UIImage imageNamed:@"left_normal"] forState:UIControlStateNormal];
[self.view addSubview:_leftButton];
[_leftButton addTarget:self action:@selector(leftClick) forControlEvents:UIControlEventTouchUpInside];
}
return _leftButton;
}
-(UIButton *)rightButton{
if(!_rightButton){
_rightButton = [[UIButton alloc]initWithFrame:CGRectMake(0, 0, 40, 40)];
_rightButton.center = CGPointMake(self.view.frame.size.width- self.icon.frame.origin.x/2, self.icon.center.y);
[_rightButton setBackgroundImage:[UIImage imageNamed:@"right_normal"] forState:UIControlStateNormal];
[self.view addSubview:_rightButton];
[_rightButton addTarget:self action:@selector(rightClick) forControlEvents:UIControlEventTouchUpInside];
}
return _rightButton;
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self changeImage];
}
/** 改变图像数据 */
-(void)changeImage{
[self.noLabel setText:[NSString stringWithFormat:@"%d/%d",self.index+1,5]];
[self.icon setImage:[UIImage imageNamed:self.array[self.index][@"name"]]];
[self.descriptionLabel setText:self.array[self.index][@"desc"]];
[self.rightButton setEnabled:(self.index!=4)];
[self.leftButton setEnabled:(self.index!=0)];
}
/** 左边按钮 */
-(void)leftClick{
NSLog(@"left");
self.index--;
[self changeImage];
}
-(void)rightClick{
NSLog(@"right");
self.index++;
[self changeImage];
}
@end
