iOS开发-简单的图片查看器

jopen 7年前

现在你只要拿着手机,不管你Android还是iOS,新闻类的App不可避免都有一个功能就是图片查看,做个专题,查看一下内容,App Store中也有专门针对图片浏览的App,鉴于目前所知有限,无法做到那么高大上的App,简单的做个美女查看的Demo。没有太多的功能,上一张,下一张,标签,图片,简简单的,深刻的感觉到知识就是力量,目前知识有限的结果就是Demo简单,且学且珍惜吧。

1.新建项目(如果不会可以参考本人之前的文章),然后在StoryBoard中进行布局,将Girl文件夹中的图片拖入项目中;

iOS开发-简单的图片查看器

2.将UIImageView,UILabel,UIButton拖入StoryBoard中,并且设置背景图片;

iOS开发-简单的图片查看器

设置背景图片:

iOS开发-简单的图片查看器

3.ViewController.h中定义成员变量:

#import <UIKit/UIKit.h>    @interface ViewController : UIViewController    @property (weak, nonatomic) IBOutlet UIImageView *imageView;      @property (weak, nonatomic) IBOutlet UILabel *pageLabel;    @end

4.上一张和下一张的事件代码:

定义一个图片数组:

@interface ViewController ()  @property NSArray *imageArr;  @end    @implementation ViewController    - (void)viewDidLoad {      [super viewDidLoad];      // Do any additional setup after loading the view, typically from a nib.       _imageArr=@[@"girl0.jpg",@"girl1.jpg",@"girl2.jpg"];  }

上一张的代码:

//显示上一张  - (IBAction)preview:(id)sender {      NSInteger currentIndex=[[[_pageLabel text] substringToIndex:1] integerValue];      NSInteger allCount=[_imageArr count];           if (currentIndex==1) {          currentIndex=allCount;      }else{          currentIndex=currentIndex-1;      }      //设置标签      [_pageLabel setText:[NSString stringWithFormat:@"%ld/%ld",currentIndex,(long)allCount]];      //获取图片的名称      NSString *imageName=[NSString stringWithFormat:@"girl%ld.jpg",(long)currentIndex-1];            UIImage *image=[UIImage imageNamed:imageName];      [_imageView setImage:image];        }

下一张代码:

//显示下一张  - (IBAction)nextView:(id)sender {      //截取标签上面的数字      NSInteger currentIndex=[[[_pageLabel text] substringToIndex:1] integerValue];      NSInteger allCount=[_imageArr count];      if (currentIndex==allCount) {          currentIndex=0;      }      NSString *imageName=[NSString stringWithFormat:@"girl%ld.jpg",(long)currentIndex];            [_pageLabel setText:[NSString stringWithFormat:@"%ld/%ld",currentIndex+1,(long)allCount]];      UIImage *image=[UIImage imageNamed:imageName];      [_imageView setImage:image];        }

以上的代码基本上都是OC基础,UIImage设置图片的时候只需要传递一下图片名称即可,不需要传递路径;

5.最终效果如下:

iOS开发-简单的图片查看器

效果很简单,就是在上一张和下一张到临界点的时候判断一下,两者的代码类似,其实可以封装一下,周末愉快;

ViewController.m中的代码:

//  //  ViewController.m  //  MyPicture  //  //  Created by keso on 15/1/17.  //  Copyright (c) 2015年 keso. All rights reserved.  //    #import "ViewController.h"    @interface ViewController ()  @property NSArray *imageArr;  @end    @implementation ViewController    - (void)viewDidLoad {      [super viewDidLoad];      // Do any additional setup after loading the view, typically from a nib.       _imageArr=@[@"girl0.jpg",@"girl1.jpg",@"girl2.jpg"];  }    - (void)didReceiveMemoryWarning {      [super didReceiveMemoryWarning];      // Dispose of any resources that can be recreated.  }  //显示上一张  - (IBAction)preview:(id)sender {      NSInteger currentIndex=[[[_pageLabel text] substringToIndex:1] integerValue];      NSInteger allCount=[_imageArr count];           if (currentIndex==1) {          currentIndex=allCount;      }else{          currentIndex=currentIndex-1;      }      //设置标签      [_pageLabel setText:[NSString stringWithFormat:@"%ld/%ld",currentIndex,(long)allCount]];      //获取图片的名称      NSString *imageName=[NSString stringWithFormat:@"girl%ld.jpg",(long)currentIndex-1];            UIImage *image=[UIImage imageNamed:imageName];      [_imageView setImage:image];        }  //显示下一张  - (IBAction)nextView:(id)sender {      //截取标签上面的数字      NSInteger currentIndex=[[[_pageLabel text] substringToIndex:1] integerValue];      NSInteger allCount=[_imageArr count];      if (currentIndex==allCount) {          currentIndex=0;      }      NSString *imageName=[NSString stringWithFormat:@"girl%ld.jpg",(long)currentIndex];            [_pageLabel setText:[NSString stringWithFormat:@"%ld/%ld",currentIndex+1,(long)allCount]];      UIImage *image=[UIImage imageNamed:imageName];      [_imageView setImage:image];        }    @end