ios - Managing Timers Passed as Variables -

i trying perform thought simple task. have handful of repeating timers need started , stopped.

i created methods starting , stopping timers, , attempt pass timers methods parameters.

the problem timers never seem stopped. ideas why might not working properly? thank you!

top of file:

#import "viewcontroller.h"  nstimer *launchtimer; nstimer *transactiontimer;   

starting method:

-(void) startingmethod {      nsstring *urlstring = @"http://google.com";      [[asynchrequestservice sharedinstance]      performasynchronousurlrequest:urlstring completion:^(bool success,      nsstring *responsebody, nsstring *responsestatus) {          if (success) {                    [self stopresponsetimer:launchtimer];         }          else {             [self startresponsetimer:launchtimer              method:@selector(startingmethod)              interval:10];         }     }]; } 

method start timer:

-(void)startresponsetimer:(nstimer *) timer method:(sel) method  interval:(int) interval {  [timer invalidate]; timer = nil; timer = [nstimer scheduledtimerwithtimeinterval:interval target:self  selector:method userinfo:nil repeats:yes]; } 

method stop timer:

-(void)stopresponsetimer:(nstimer *) timer {  nslog(@"stop timer");  [timer invalidate]; timer = nil; } 

make startresponsetimer , `stopresponsetimer' take pointer object pointer intead.

-(void)startresponsetimer:(nstimer **) timer method:(sel) method  interval:(int) interval {  [*timer invalidate]; *timer = nil; *timer = [nstimer scheduledtimerwithtimeinterval:interval target:self  selector:method userinfo:nil repeats:yes]; }  -(void)stopresponsetimer:(nstimer **) timer {  nslog(@"stop timer");  [*timer invalidate]; *timer = nil; } 

then invoke

[self startresponsetimer:&launchtimer]; [self stopresponsetimer:&launchtimer]; 

this should make sure retain right nstimer object. note:it idea check pointer pointer object null in public method