How to use NSTimer class

A simple example code showing how to use NSTimer class to schedule works.
NSTimer is very useful to do something repeatedly for some period of time.

// Method for timer to callback.

    - (void) handleTimer: (NSTimer *) timer

    {

      // Your work here (periodic work)

    }

// Create a NSTimer object to call above callback method.
//

    NSTimer *timer; 

    timer = [NSTimer scheduledTimerWithTimeInterval: 0.03f target: self selector: @selector(handleTimer:)

  userInfo: nil repeats: YES];

// Dismiss timer when you are done with it.

//

   [tmier invalidate];