NSUserDefaults are reset (possible duplicate rdar://10535951)

Originator:mike
Number:rdar://17813085 Date Originated:25-Jul-2014
Status:Open Resolved:YES
Product:iOS Product Version:7.1.2
Classification:Data Loss Reproducible:Always
 
I have an app that responds to significant change notifications. When I start and use the app I save some information to the NSUserDefaults. After the phone reboots my app wakes up because iOS provides a significant change notification.

When my app wakes up I make sure that nothing touches NSUserDefaults unless protected data is available. However, something still creates a fresh set of empty defaults. Those defaults hang around in memory.

If I then unlock my phone and open the app the blank set of defaults are synchronized and all of my data is gone.

Notes:
-If I unlock the phone, but do not start the app and examine the preferences file everything is still there.
-If I unlock my phone, then force quit my app, and then open it everything is fine.

Comments

FYI This has been resolved by Apple. The did 2 things.

  1. Apps no longer get a significant location change update just because the phone restarts
  2. They put in protections to prevent NSUserDefaults from getting wiped.

I've verified that I can't repro this in iOS 8

By mike at Jan. 21, 2015, 7:56 p.m. (reply...)

I don't see a way to attach anything here on Open Radar, but I already did all of that in actual Radar.

By mike at July 29, 2014, 4:12 p.m. (reply...)

Create a small project that demonstrates this and attach to the bug Verify wether it happens with the latest seed

By quellish at July 25, 2014, 11:04 p.m. (reply...)

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