Question

How would I use NSTimer to make an action happen every second?

regards Nikita.

Answer 1

Use it this way,

-(void)fireTimer{
   [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selected(timeOut:) userInfo:nil repeats:YES];
}

Now, this will call your timeOut: selector every 1 sec and then in the timeOut:

-(void)timeOut:(NSTimer*)timer{
   static int count = 0;
   count++;
   if(count == 60){
     [timer invalidate]; 
     timer = nil;
   }
}

There are many apis. I hope you would like to check https://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSTimer_Class/Reference/NSTimer.html.