NSTimer - NSSlider

Question

I have a NSTimer and a NSSlider in my app. How do I make, that the time interval of the timer would respond instantly to the slider value?

For now it responds just at the beginning. Once the timer is already fired, it doesn't respond any more...

[NSTimer scheduledTimerWithTimeInterval:[slider doubleValue]
                                 target:self
                               selector:@selector(updateTextFieldWithRandomNumber)
                               userInfo:nil
                                repeats:YES];

score 1 · Answer 1 · answered Sep 21 '11 at 09:19

1

You cannot change the time interval of a timer once you have created it. You have to invalidate the old timer and create a new one with the new time interval.

answered Sep 21 '11 at 09:19

Ole Begemann

135,006
31
278
256

score 0 · Accepted Answer · answered Sep 21 '11 at 09:20

0

What about putting a KVO observation on the slider's doubleValue property and invalidating the timer and recreating it when the notification happens?

answered Sep 21 '11 at 09:20

JeremyP

84,577
15
123
161

Thaks! Sounds interesting! How should I make that? I have read the developer library about that, but I don't really have an idea, how to do that. I am quite new at programing with Obj C. – Damijan Sep 21 '11 at 09:29
@Damijan: http://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/KeyValueObserving/Articles/KVOBasics.html#//apple_ref/doc/uid/20002252-178352 – JeremyP Sep 23 '11 at 10:51

NSTimer - NSSlider

2 Answers2