- For how long can you perform work when your app is woken up for background refresh?
a) About two minutes. b) There is no way to be sure. c) You have no time limit.
- How do you enable background fetch for your app?
a) By requesting it in AppDelegate.
b) By enabling the Background Refresh capability.
c) Both.
- Which statement about the minimum refresh interval is true?
a) Your app will be woken up every time the interval passes. b) iOS will determine when it's the best time wake up your app. It will be no more often that you specify. c) iOS will ask your app whether it has any work to do when the interval passes.
- What did you use a dispatch group for in this chapter?
a) To take work off the main thread. b) To be notified when all network calls were done. c) To make sure all network calls are fired at the same time.
- When should you refactor your code?
a) When you get frustrated with your code. b) When you find strange bugs. c) Any time you think you can improve something.
- What do you...