Detect if app is opened from lock screen - ios

Question

I'm creating an app that displays monitors iBeacon regions, which means that when the device is locked and within range of a beacon, my app's icon is shown on the lock screen in the bottom left.
Is there any way that I can detect if my app is launched through this lock screen icon, and run some code?

Answer 1

When the icon appears, it indicates that a beacon region has been entered. The CLLocationManager delegate's didEnterRegion method will be called when the icon first appears.
You can put custom code there to set a flag indicating the icon appeared.
- (void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region {
_iconShown = YES;
}
Then, when your app comes to the foreground, you can check this flag to see if it is set, and execute your custom logic:
- (void)applicationWillEnterForeground:(UIApplication *)application {
if (_iconShown) {
_iconShown = NO;
// Put custom logic here for launching from the icon
}
}

Answer 2

hmm, there is an alternative way, that you can handle it, just create an variable self.backgroundedToLockScreen like:
- (void)applicationWillEnterForeground:(UIApplication *)application {
if (self.backgroundedToLockScreen) {
... // app was backgrounded to lock screen
} else {
... // app was backgrounded on purpose by tapping the home button or switching apps.
}
self.backgroundedToLockScreen = NO;
}
and
- (void)applicationWillEnterForeground:(UIApplication *)application {
UIApplicationState state = [[UIApplication sharedApplication] applicationState];
if (UIApplicationStateInactive == state || // detect if coming from locked screen (iOS 6)
self.backgroundedToLockScreen) // detect if backgrounded to the locked screen (iOS 7)
{
... // app is coming from or was backgrounded to lock screen
} else {
... // app was backgrounded on purpose by tapping the home button or switching apps
}
self.backgroundedToLockScreen = NO;
}
Hope this could be useful for you.