Enable Application cache in WKWebView

Question

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)

Clement Prem Clement Prem · Accepted Answer · 2015-04-27T13:15:58

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

Enable Application cache in WKWebView

2 Answers