iOS - Do an action every second

Question

I want to make an action when every second is passed, for example I got a label and I want it every second to do this :

theLabel.text = @"Hey";

So, how I'll do it? I think I'll need to use the NSTimer right?

Thanks in Advance

Very nice exmaples: http://stackoverflow.com/questions/1449035/how-do-i-use-nstimer — Vinay Jain, Dec 02 '13 at 16:13
@rmaddy I just saw that question after I posted this question! — AFB, Dec 02 '13 at 16:15

score 4 · Answer 1 · answered Dec 02 '13 at 16:11

4

Just use a NSTimer:

NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(doSomething:) userInfo:nil repeats: YES];

And to stop it:

[timer invalidate];

Find the documentation here:

NSTimer Doc

answered Dec 02 '13 at 16:11

Antonio MG

20,382
3
43
62

5

Wouldn't it be better to simply flag the question as one of a thousand duplicates? – rmaddy Dec 02 '13 at 16:13

score 2 · Answer 2 · answered Dec 02 '13 at 16:15

2

A "plan B" solution:

[self performSelector:@selector(foo) withObject:nil afterDelay:{some time interval}];

-(void)foo
{
    //do something..
    [self performSelector:@selector(foo) withObject:nil afterDelay:{some time interval}];
}

answered Dec 02 '13 at 16:15

Mert Buran

2,989
2
22
34

score 1 · Answer 3 · answered Dec 02 '13 at 16:16

Yes @kevin you are right NSTimer is the best

just initialize your timer on did load

NSTimer *timerCounter = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(doMyWork) userInfo:nil repeats: YES]; //make repeats YES

and do the below

-(void)doMyWork
{
   theLabel.text = @"Hey";
   // Or what ever you want to do
}

iOS - Do an action every second

3 Answers3