Get Active Application Identifier

Question

My question differs than the other ones, because I am coding for a jailbroken environment. The method I am editing belongs to SpringBoard and creates a system wide change, on all apps. Using this command:

[[NSBundle mainBundle] bundleIdentifier]

Only brings SpringBoard, as this method belongs under SpringBoard. So is there a way to tell which app is active in front of SpringBoard?

Answer 1

Things are way easier than what would one think. I found out that this brings the answer:

SBApplication *front = [[objc_getClass("SpringBoard") sharedApplication] _accessibilityFrontMostApplication];
NSString *runner = front.bundleIdentifier;

Answer 2

There is -(NSString*)topApplication method in BKSWorkspace class which returns bundle identifier of a top-most application. In order to get a valid instance of BKSWorkspace you need to hook it's -(id)init method to retain and store an instance for yourself. SpringBoard stores these instances in such a way that you can't access them without hooking init.