All Projects → CoderZhuXH → Xhwebimageautosize

CoderZhuXH / Xhwebimageautosize

Licence: mit
网络图片尺寸、高度自适应/适配 - 支持异步缓存imageSize , 支持动态刷新界面

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XHWebImageAutoSize

网络图片尺寸/高度自适应解决方案

AppVeyor Version Status Support Pod Platform Pod License

==============

前言:

  • 1.iOS开发中,常碰到网络图片需要做尺寸适配(使显示出来的图片不变形)
  • 2.最好的解决方案是:后台把图片的分辨率拼接在图片的URL地址中,我们截取获得分辨率,从而根据宽高比,来适配imageView尺寸.
  • 3.但往往有些时候由于各种原因,图片分辨率后台那边加不上去,没办法只好我们自己来解决了.
  • 4.XHWebImageAutoSize就是解决3中的这种情况.

特性:

  • 1.异步缓存网络图片尺寸,优先从缓存中获取图片尺寸.
  • 2.UITableView,UICollectionView UI动态更新.

技术交流群(群号:537476189).

效果

使用方法

1.此处以在UITableView中使用,UITableViewCell上仅有一个UIImageView为例(其他示例详见DEMO)

   
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    NSString *url = self.dataArray[indexPath.row];
    /**
     *  参数1:图片URL
     *  参数2:imageView 宽度
     *  参数3:预估高度(此高度仅在图片尚未加载出来前起作用,不影响真实高度)
     */
    return [XHWebImageAutoSize imageHeightForURL:[NSURL URLWithString:url] layoutWidth:[UIScreen mainScreen].bounds.size.width-16 estimateHeight:200];
}   

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    DemoVC1Cell *cell = [tableView dequeueReusableCellWithIdentifier:cellId];
    if(!cell){
        cell = [[DemoVC1Cell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellId];
    }
    NSString *url = self.dataArray[indexPath.row];
    //加载网络图片使用SDWebImage
    [cell.imgView sd_setImageWithURL:[NSURL URLWithString:url] completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
        /** 缓存image size */
        [XHWebImageAutoSize storeImageSize:image forURL:imageURL completed:^(BOOL result) {
            /** reload  */
            if(result)  [tableView  xh_reloadDataForURL:imageURL];
        }];
    }];
    return cell;
}

API

  • 1.获取图片高度/尺寸及缓存相关
/**
 *   Get image height
 *
 *  @param url            imageURL
 *  @param layoutWidth    layoutWidth
 *  @param estimateHeight estimateHeight(default 100)
 *
 *  @return imageHeight
 */
+(CGFloat)imageHeightForURL:(NSURL *)url layoutWidth:(CGFloat)layoutWidth estimateHeight:(CGFloat )estimateHeight;

/**
 *  Get image width
 *
 *  @param url            imageURL
 *  @param layoutHeight   layoutHeight
 *  @param estimateWidth estimateWidth(default 90)
 *
 *  @return imageHeight
 */
+(CGFloat)imageWidthForURL:(NSURL *)url layoutHeight:(CGFloat)layoutHeight estimateWidth:(CGFloat )estimateWidth;

/**
 *  Get image size from cache,query the disk cache synchronously after checking the memory cache
 *
 *  @param url imageURL
 *
 *  @return imageSize
 */
+(CGSize )imageSizeFromCacheForURL:(NSURL *)url;

/**
 *  Store an imageSize into memory and disk cache
 *
 *  @param image          image
 *  @param url            imageURL
 *  @param completedBlock An block that should be executed after the imageSize has been saved (optional)
 */
+(void)storeImageSize:(UIImage *)image forURL:(NSURL *)url completed:(XHWebImageAutoSizeCacheCompletionBlock)completedBlock;

  • 2.tableView reload
/**
 Reload tableView

 @param url imageURL
 */
-(void)xh_reloadDataForURL:(NSURL *)url;

  • 3.collectionView reload
/**
 Reload collectionView
 
 @param url imageURL
 */
-(void)xh_reloadDataForURL:(NSURL *)url;

安装

1.手动添加:

  • 1.将 XHWebImageAutoSize 文件夹添加到工程目录中
  • 2.导入 XHWebImageAutoSize.h

2.CocoaPods:

  • 1.在 Podfile 中添加 pod 'XHWebImageAutoSize'
  • 2.执行 pod install 或 pod update
  • 3.导入 XHWebImageAutoSize.h

Tips

  • 1.如果发现pod search XHWebImageAutoSize 搜索出来的不是最新版本,需要在终端执行cd ~/desktop退回到desktop,然后执行pod setup命令更新本地spec缓存(需要几分钟),然后再搜索就可以了
  • 2.如果你发现你执行pod install后,导入的不是最新版本,请删除Podfile.lock文件,在执行一次 pod install
  • 3.如果在使用过程中遇到BUG,希望你能Issues我,谢谢(或者尝试下载最新的代码看看BUG修复没有)

系统要求

  • 该项目最低支持 iOS 7.0 和 Xcode 7.0

许可证

XHWebImageAutoSize 使用 MIT 许可证,详情见 LICENSE 文件

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