How to keep NSTimer alive in Background on iOS 7?

Question

I have created Application which runs NSTimer in Background. I used the Location manager to run the NSTimer in background,

I used below link to run NSTimer in backgr

Answer 1

[[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:nil];
loop = [NSTimer scheduledTimerWithTimeInterval:0.25 target:self selector:@selector(Update) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:loop forMode:NSRunLoopCommonModes];