Question

How do you clear/flush the WebView cache in a Cocoa app?

In particular, I would like to clear the cache of a local stylesheet.

I have tried the following to no avail:

// Tried this before loadRequest
[[NSURLCache sharedURLCache] removeAllCachedResponses];

// Also tried this before and after loadRequest
[webView.mainFrame reloadFromOrigin];

Even replacing the WebView with a new one still uses the cached stylesheet.

Answer 1

The other suggested solutions didn’t work for the local stylesheet (though they should work for remote resources).

I finally managed to solve this via the resourceLoadDelegate, by explicitly setting the cache policy:

- (NSURLRequest *)webView:(WebView *)sender resource:(id)identifier willSendRequest:(NSURLRequest *)request redirectResponse:(NSURLResponse *)redirectResponse fromDataSource:(WebDataSource *)dataSource {
    request = [NSURLRequest requestWithURL:[request URL] cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:[request timeoutInterval]];
    return request;
}

Fun stuff.