ios - Why does my NSTimer selector never fire? Is it because it's in GLKitViewController instead of UIViewController? -

at state in program, call method body:

self.timestarteddisplayingtime = [nsdate date]; self.stopbutton.enabled = yes;  [nstimer scheduledtimerwithtimeinterval:0.01 target:self selector:@selector(updateelapsedtime:) userinfo:nil repeats:yes]; 

i've verified method indeed called.

however, corresponding selector's body:

nstimeinterval elapsedtimedisplayingecg = [self.timestarteddisplayingecg timeintervalsincedate:[nsdate date]]; self.elapsedtimevaluelabel.text = [nsstring stringwithformat:@"%f", elapsedtimedisplayingecg]; 

is never called. i've put breakpoint on , it's never reached. why exactly? it's in glkitviewcontroller instead if that's relevant.

your timer gets thrown away right after creating it. need retain somewhere.

define property

@property (strong) nstimer *mytimer;

and assign timer this:

self.mytimer = [nstimer scheduledtimer scheduledtimerwithtimeinterval:0.01 target:self selector:@selector(updateelapsedtime:) userinfo:nil repeats:yes];