WKWebView caching not working

basilbasil USMember ✭✭

Hi there,

I’m building a Xamarin Forms project whose main component is a WebView.
I have built it such that on iOS7 a UIWebView is used, and on iOS8 a WKWebView is used.

Basically I want a cache for the WebViews to persist between runs of the application.

Using iOS7’s UIWebView I managed to figure it out using the code below:

NSUrlCache.SharedCache = new NSUrlCache(50 * 1024 * 1024, 200 * 1024 * 1024, "cache");

Now unfortunately I didn’t find any documentation explaining how it works, so this was very trial and error.
So I’m not sure on recommended sizes for the cache size in memory or on disk… any guidance would be very much appreciated!

On iOS 8 though, this solution just does not work.
I haven’t been able to find any data on the Xamarin Forums (or anywhere else, including the apple forums) explaining how to do this, so perhaps it could be a limitation of the WKWebView? Or my google-fu is lacking?

Any information on how to set up the cache would be much appreciated!

Also of interest, the caching policy on a Load request doesn’t seem to have much of an effect on either the UIWebView or the WKWebView.
For example, the code below does not ignore local cache and request a fresh copy from the server.
Is this a known issue, or am I perhaps not using it correctly?

webView.LoadRequest(new NSUrlRequest(new NSUrl(url), NSUrlRequestCachePolicy.ReloadIgnoringLocalAndRemoteCacheData, 15));

Thanks in advance,

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