SDWebImage

SDWebImage做了内存和硬盘的缓存

 

清除内存缓存：

- (void)applicationDidReceiveMemoryWarning:(UIApplication *)application{

        //停止下载图片

    [[SDWebImageManager sharedManager] cancelAll];

    //清除内存中图片

    [[SDWebImageManager sharedManager].imageCache clearMemory];

}