DotMac

NSTimer (set timer)

				NSTimer* aTimer = [NSTimer scheduledTimerWithTimeInterval:0.5

									 target:self 

								   selector:@selector(myTimerMethod)

								   userInfo:self

									repeats:YES];

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-(void)myTimerMethod

{

	//code here

}

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to stop timer,

 [aTimer invalidate];