ios-day02-04(图片浏览器)

最新推荐文章于 2025-06-24 09:08:10 发布

转载最新推荐文章于 2025-06-24 09:08:10 发布 · 499 阅读

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本文详细介绍了如何使用Objective-C开发一款图片浏览器应用，包括界面设计、数据加载、页面切换等功能，并通过延迟加载优化用户体验。

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源码下载地址 http://download.youkuaiyun.com/detail/liu537192/8411073

效果图：

//
//  LiuJieViewController.m
//  04-图片浏览器
//
//  Created by XinYou on 15-1-30.
//  Copyright (c) 2015年 vxinyou. All rights reserved.
//

#import "LiuJieViewController.h"

// 使用宏来定义常量
#define LiuJieIconKey @"icon"
#define LiuJieDescKey @"desc"

@interface LiuJieViewController ()

- (IBAction)previous;
- (IBAction)next;

@property (weak, nonatomic) IBOutlet UILabel *numLabel;
@property (weak, nonatomic) IBOutlet UILabel *descLabel;
@property (weak, nonatomic) IBOutlet UIImageView *iconView;
@property (weak, nonatomic) IBOutlet UIButton *previousBtn;
@property (weak, nonatomic) IBOutlet UIButton *nextBtn;

// 记录当前显示的是第几张图片
@property (nonatomic, assign) int index;

// 图片数据集合。为什么这里使用strong策略？
// 暂时只需记住一点：strong策略用于一般对象，weak策略用于UI控件
@property (nonatomic, strong) NSArray *imageData;

@end

@implementation LiuJieViewController


// 使用延迟加载，没有必要在程序一运行就加载所有数据，而是需要用到某些数据时再加载这些数据。
- (NSArray *)imageData{
    
    //如果这里写成 "self.imageData != nil" 就会陷入死循环
    if(_imageData == nil){
    
        NSMutableDictionary *image1 = [NSMutableDictionary dictionary];
        image1[LiuJieIconKey] = @"biaoqingdi";
        image1[LiuJieDescKey] = @"在他面前，其他神马表情都弱爆了！";
        
        NSMutableDictionary *image2 = [NSMutableDictionary dictionary];
        image2[LiuJieIconKey] = @"wangba";
        image2[LiuJieDescKey] = @"哥们为什么选八号呢";
        
        NSMutableDictionary *image3 = [NSMutableDictionary dictionary];
        image3[LiuJieIconKey] = @"bingli";
        image3[LiuJieDescKey] = @"这也忒狠了";
        
        NSMutableDictionary *image4 = [NSMutableDictionary dictionary];
        image4[LiuJieIconKey] = @"chiniupa";
        image4[LiuJieDescKey] = @"chiniupa";
        
        NSMutableDictionary *image5 = [NSMutableDictionary dictionary];
        image5[LiuJieIconKey] = @"danteng";
        image5[LiuJieDescKey] = @"亲，你能改下你的网名么？哈哈";
        
        // 初始化数组
        _imageData = @[image1, image2, image3, image4, image5];
    }

    return _imageData;
}

- (void)changeData{
    // 1,改变页码
    self.numLabel.text = [NSString stringWithFormat:@"%d/%d", self.index+1, self.imageData.count];

    // 2,取出index对应的字典数据
    NSDictionary *imageDict = self.imageData[self.index];
    
    // 3,设置图片
    self.iconView.image = [UIImage imageNamed:imageDict[LiuJieIconKey]];
    
    // 4,设置图片的描述
    self.descLabel.text = imageDict[LiuJieDescKey];
    
    // 5,改变按钮状态
    self.previousBtn.enabled = (self.index != 0);
    self.nextBtn.enabled = (self.index != self.imageData.count-1);
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    //
    [self changeData];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)previous {
    
    self.index--;// self.index = self.index - 1; 这里既用到了set方法又用到了get方法
    
    [self changeData];
}

- (IBAction)next {
    
    self.index++;
    
    [self changeData];
}
@end