How do you clear the WebView cache in Cocoa?

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.

Look at this discussion http://stackoverflow.com/a/5606703/1578508 — lukaswelte, Aug 22 '12 at 12:53

score 10 · Accepted Answer · answered Aug 22 '12 at 13:04

10

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.

answered Aug 22 '12 at 13:04

hpique

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This doesn't appear to be working for me. OSX 10.10.3. – mattsven Jun 02 '15 at 02:12
This didn't work for me either on 10.12. Only solution I found so far was to embed the local stylesheet, rather than linking to it. – Brett Apr 19 '17 at 15:43

Parag Bafna · Answer 2 · 2012-08-22T12:51:07.390

0

Take a look at NSURLCache Class Reference.

- (id)initWithMemoryCapacity:(NSUInteger)memoryCapacity diskCapacity:(NSUInteger)diskCapacity diskPath:(NSString *)path 
//set memoryCapacity and diskCapacity to 0 bytes and diskPath to nil

NSURLCache *Cache = [[NSURLCache alloc] initWithMemoryCapacity:0 diskCapacity:0 diskPath:nil];
[NSURLCache setSharedURLCache:Cache];

edited Aug 22 '12 at 12:51

answered Aug 22 '12 at 12:25

Parag Bafna

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Interesting but doesn't appear to work. A cache of the local stylesheet is still loaded. – hpique Aug 22 '12 at 12:49

How do you clear the WebView cache in Cocoa?

2 Answers2

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