如何在没有任何缓存的情况下为一个实例使用SDWebImage [英] How to use SDWebImage without any cache for one instance

问题描述

我在桌面上显示图像时几乎都使用 SDWebImage 图像下载/缓存库查看。

I use the SDWebImage image downloading/caching library pretty much any time I display an image in a table view.

我通常会这样实现它（在表视图中 cellForRowAtIndexPath 方法）。

I would usually implement it like so (in a table view cellForRowAtIndexPath method).

[cell.imageView setImageWithURL:
[NSURL URLWithString:@"http://asite.com/animage.jpg"] 
placeholderImage:[UIImage imageNamed:@"placeholder.png"]];        

这会加载缓存版本（如果有的话）。

And that would load a cached version if it had one.

如果我想使用SDWebImage的简单性（使用占位符/强大的下载代码） - 但只有一个地方没有缓存那么。

What about if I wanted to use the simplicity of SDWebImage (with the placeholder / robust downloading code) - but without the cache in just one place.

我知道如何在整个SDWebImage中禁用缓存，但我不知道如何调用 setImageWithUrl：placeholderImage：确保SDWebImage没有t使用任何缓存？

I know how to disable caching throughout SDWebImage, but I don't know how you would call setImageWithUrl: placeholderImage: making sure that SDWebImage doesn't use any cache?

我想这样做的原因是我用它来在桌面视图中显示网络摄像头（显然，你希望每次都更新） 。

The reason I want to do this is I'm using it to display webcams in a table view (obviously, you want this updated every time).

推荐答案

我建议远离UIImageView上的类别并创建自己的SDWebImageManager版本。如果您自己使用SDImageCache类，您将获得更多控制权。

I recommend moving away from the Category on UIImageView and creating your own version of SDWebImageManager. You'd get more control if you use the class SDImageCache yourself.

来自SDWebImageManager本身的Heres和示例：

Heres and example right from SDWebImageManager itself:

[[SDImageCache sharedImageCache] storeImage:image
                                  imageData:downloader.imageData
                                     forKey:[downloader.url absoluteString]
                                     toDisk:NO];

toDisk可能是我将BOOL更改为NO的地方，默认管理器使用磁盘缓存。您可能还需要经常清理内存以支持您的流媒体图像：

toDisk is probably where I changed the BOOL to NO, the default manager uses disk caching. You may also want to clear the memory every so often to support your streaming images:

[[SDImageCache sharedImageCache] clearMemory];

SDWebImageManager代码很容易理解，我想你不需要重新发明大部分代码，只需几个重要部分来满足您的需求。

The SDWebImageManager code is easy to follow and I imagine you won't need to reinvent most of it, just a few important portions to suit your needs.

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