You have logs where the app, woken by a background push while the screen is locked, fails to open its local database. What is file protection (Data Protection) on iOS?
Data Protection is a class per file that decides whether the file's key can be used depending on the lock state (complete, unlessOpen, untilFirstUserAuthentication, none), and the default is accessible from the first unlock onward.
App lifecycle and systemShort answerIntro
A user is working in your app, takes a phone call, hangs up, goes out to the home screen…
#background
App lifecycle and systemShort answerBasics
You get a report that a save to the server never lands when the user taps save and goes…
#background
App lifecycle and systemShort answerAdvanced
A requirement comes in: "every night while the user sleeps, clear the cache and prefetch…
#background
App lifecycle and systemMultiple choiceAdvanced
Which statements about BGAppRefreshTask are correct? Pick all that apply.
#background