how long app keep alive in the background?
- (void)applicationDidEnterBackground:(UIApplication *)application { }
app 4 status:
1: app running in the foreground
2: app running in the background of memory
3: app not running in the background of memory, hang up
4: app was killed, no running, no in memory
when app status is " 2: app running in the background of memory", ios system has a default application running time.
this time I want to know how much is the concrete under different systems.
ios6 is 300 second?
ios7 is 180 second?
ios8
ios9
ios10
thanks!
