How to make a counter?

Add an integer ivar to your controller and in the button event listener increment it.

Start with the View-based App template:

// XDevViewController.h
@interface XDevViewController : UIViewController {
 int currentCount;
}
- (IBAction)incrementCount;
@end
// XDevViewController.m
#import "XDevViewController.h"
@implementation XDevViewController
- (IBAction)incrementCount {
 currentCount++;
 NSLog(@"currentCount=%d", currentCount);
}
@end

Open XdevViewController.xib, add a UIButton object to the view, and connect the (Touch Up Inside) event of the button to the incrementCount action of File's Owner.

This is pretty basic stuff, X. In fact I just peeked at my ChicagoScope and saw Trakesh rolling his eyes, since he already posted enough for a beginner to code from. So I really, really want you to get a good book, such as +Beginning iPhone 3 Development: Exploring the iPhone SDK+ by LaMarch and Mark. Ok?

- Ray

If Ray's example is not good enough, the code sample I used for my iPhone SDK presentation (a bit dated especially w.r.t IB), should walk you through the steps (my sample was precisely an incrementing counter). http://sptci.com/products/articles/iPhoneSDK.pdf

What is it that you are trying to do? How is a counter related to a NSTimer? Google for lots of good examples on the usage of timers.

We don't need to know your idea, but what it is that you want to do (in this specific case as relates to your question). My previous question about why you need a NSTimer still stands, since you have not really explained what you are trying to do. A counter is very different from a timer, and your original question was related to a counter.

use of nstimer doesn't make any sense. why don't you go with simple example provided by ray.

Usman