NSTimer not firing the selector

ios nstimer
inforeqd picture inforeqd · Mar 29, 2012 · Viewed 28k times · Source

In ios5.0 with ARC, in my rootviewcontroller I call a method in a security manager object that is held by the app delegate. In that method I setup the timer as below

NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:5.0 target:self 
                                       selector:@selector(updateModel:) userInfo:str repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];

However, this never fires the selector ie. updateModel: never gets called. What may be wrong? Is there another more efficient way I can do this without using NStimer?

Answer

tmanthey picture tmanthey · Aug 7, 2013

Could also be a threading problem:

if

[NSThread isMainThread]

is false then start the timer like this:

dispatch_async(dispatch_get_main_queue(), ^{
        timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(tick:) userInfo:nil repeats:YES];
    })

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