Xcode: SDWebImage clear cache for single image

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I'm using SDWebImage to asynchronous image downloader with cache support.

It's working perfectly except that sometimes the image got updated on the server with same name, thus I need to clear it from client device cache but no success!

I found here that I have to use "removeImageForKey" but it's not recognized by Xcode!

I'm using the following code to set the image:

[imgPic setImageWithURL:[NSURL URLWithString:@"http://domain.com/image.jpg"] placeholderImage:[UIImage imageNamed:@"tmpPic.png"]];

What's the correct way to call removeImageForKey? What do I have to import rather than UIImageView+WebCache.h?

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