Enable Application cache in WKWebView

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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

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