CODEWITHSUNDEEP
iosobjective-cwebkitwkwebviewapplication-cache
Clement Prem
Clement Prem

Reputation: 3119

Enable Application cache in WKWebView

I am aware that offline application cache is not supported in iOS WKWebView.

This is enabled in Safari, so I searched webkit project for the responsible code & found this

WKPreferences

- (void)_setOfflineApplicationCacheIsEnabled:(BOOL)offlineApplicationCacheIsEnabled;

Anyone familiar with this method? is it possible to enable app cache in iOS by accessing this private methods? (I am not going to ship the app to Appstore)

Upvotes: 13

Views: 22076

Answers (2)

Clement Prem
Clement Prem

Reputation: 3119

Update 2022

According to one of the comments below, this hack doesn't work anymore.

Yes, we can enable App cache by accessing private API

Create a category for WKPreferences and add to following method signature.

@interface WKPreferences (MyPreferences)
- (void)_setOfflineApplicationCacheIsEnabled:(BOOL)offlineApplicationCacheIsEnabled;
@end

(I tried performSelector:withObject: but it didn't work. No idea why)

After initializing the WKWebView, enable the appcache by calling the above method in the following object

  [_wkWebView.configuration.preferences _setOfflineApplicationCacheIsEnabled:YES];

It will create the ApplicationCache.db file in the Cache directory and allow the web app to work offline.

Warning :

2.5. Apps that use non-public APIs will be rejected

Upvotes: 10

Andrew Ebling
Andrew Ebling

Reputation: 10283

According to this tweet from at Apple, as of iOS 10, App Cache is now supported in WKWebView:

https://twitter.com/andersca/status/743259582252879872

...as does this WebKit bug report:

https://bugs.webkit.org/show_bug.cgi?id=152490

I've tested this in WKWebView using this site:

http://webdbg.com/test/appcache/

and can confirm it works as expected both in the iOS Simulator and on devices running iOS 10.

Upvotes: 2

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