How to start an NSTimer when i click on a button?

Question

How can i start an NSTimer when a user clicks a button?

EDIT:i had the code working and everything, but i put the code to hide the button above the NSTimer code, and when i placed it below the NSTimer code it worked!

Answer 1

Schedule it in the IBAction of the button. Check NSTimer Class Reference to know how to use timers.

Answer 2

Hi,

The line of code to start a timer is (read the docs here) :

[NSTimer scheduledTimerWithTimeInterval:1.0
                                 target:self
                               selector:@selector(timerFired:)
                               userInfo:nil
                                repeats:nil];

This will call the method timerFired: after 1 second i.e.

- (void)timerFired:(NSTimer *)timer {
  NSLog(@"timer : %@ has gone off", timer);
}

To get this to trigger from a button, you need this method in your .h file :

- (IBAction)buttonPressed:(id)sender;

and in your .m file, detect the button press like this :

- (IBAction)buttonPressed:(id)sender {
  NSLog(@"Button's been pressed!");
}

Then, in interface builder connect the button's 'Toiuch Up Inside' action to this method.