Cocoa - Action every second

Question

How can I set action to update some information every 1 second?

I am creating chat (using social network API) and I have to check for new messages.

Answer 1

Declare an instance of NSTimer in your .h file like this

NSTimer *timer;

then schedule it:

timer = [NSTimer scheduledTimerWithTimeInterval:1 
                                         target:self   
                                       selector:@selector(checkForNewMessages) 
                                       userInfo:nil 
                                        repeats:YES];

When you don't need the timer anymore do this:

[timer invalidate];
 timer = nil;