Timer can't start in ViewWillAppear Methods
===

I have scenario that in my application I want to start timer when **viewWillAppear** method gets calling it working perfect but the point where I getting **problem** is that when I push new view on this Current View (Which is having timer in **ViewWillAppear**) and I want that when I **pop that new View** and when **recall** **viewWillAppear** I want to **start timer again as befour** I have mostly all technque but not get solution kindly me 

it's urgent 

Thanks in Advance