how to show countdown on uilabel in iphone?

Question

i have a uilabel and a uislider on a view. i want to set label\'s time using slider.range of slider is 00:00:00 to 03:00:00. means 3 hours.and intervel on slider is 0.5 minutes.

Answer 1

This code is wrong.

timer = [NSTimer scheduledTimerWithInterval: 1.0 target:self selector:@selector(updateCountdown) userInfo:nil repeats: YES];

It should be.

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