swift2 - Invalidate NSTimer when going back navigation not forward -


i have nstimer counts down number of seconds. timer sits in middle view of 3 view process.

i need invalidate timer because have found if don't app memory starts blowing out (strong reference).

i put invalidate in viewwilldisappear method because there 1 more view user can segue stops timer , when user comes view countdown paused.

how can invalidate nstimer if user goes in view hierarchy , not forward.

you can in viewwilldisappear:

if(![self.navigationcontroller.viewcontrollers containsobject:self]) {         [timer invalidate];     }

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