is there a notification when “slide to unlock” has occurred

问题

I have an iphone game that plays background music using AVSoundPlayer - when someone locks the iphone the music stops which is fine. But when someone unlocks it, I don't want my music to start playing again while you're staring at the "slide to unlock" screen - I want it to start playing once you've actually slid the button and the app is visible again - is there some way to detect this? (I've tried applicationDidBecomeActive but that fires when the phone is unlocked but not when your app is visible yet...)

回答1:

You could try viewWillAppear.

回答2:

- (void)applicationDidBecomeActive:(UIApplication *)application;

This sent when your app becomes active

Another answer on SO applicable to your question:

applicationWillTerminate works as long as I don't switch off the iPhone

来源：https://stackoverflow.com/questions/1008595/is-there-a-notification-when-slide-to-unlock-has-occurred