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Cordova LocalStorage cleared after first App launch on iOS 6

“OMG WTF ! ? “

That’s what we thought today when we were hunting a bug in a PhoneGap / Cordova iOS app.

Symptoms

Upon first launch of the app (in the simulator, from PhoneGap build, or the AppStore) the app saves registration info in LocalStorage. Next time the app launches, it checks LS and recognizes you as a known user.

However, upon the second launch, we had to register again and found out that the LS was empty!

The Problem: Cordova LocalStorage cleared

Googling around, we found it’s actually a known issue on iOS 6 in Cordova 2.1.0: Upon first launch, Cordova tells iOS to remember anything the app stores in LS. This is done with a flag. However, the flag is set too late, so anything put in LS on the first run is not saved to the correct location.

The next time the app is started (and any consecutive time for that matter), the flag has already been set and the LS will behave as you’d expect (surviving app restarts, crashes, app upgrades, etc).

The solution

With this blog we hope to save some fellow coders a few hours of bug hunting. The suggestion done by Christian Hemker in the issue mentioned previously is the right thing to do. We had to roll out a quick fix, so there was no time to upgrade to a newer version of Cordova; we had to patch Cordova 2.1.0 (this bugfix was released with Cordova 2.2.0).

Don’t forget to do a Product > Clean in XCode, so the Cordova files get recompiled along with your project upon the next build.

Using PhoneGap Build?

Unfortunately, it’s not currently possible to add your custom Java code to apps built with PhoneGap Build. But if you do use that great Adobe cloudservice, check out this nice new app we created: Buildmeister, a mobile app for managing your PhoneGap Build apps.

Download Buildmeister for these platforms:

Android app on Google Play

Buildmeister - X-Services