-(void)startTimer {
frameTimer = [NSTimer scheduledTimerWithTimeInterval:TIMER_INTERVAL
target:self
selector:@selector(handleTimer:)
userInfo:nil
repeats:YES];
}
-(void)stopTimer {
if (frameTimer != nil) {
[frameTimer invalidate];
frameTimer = nil; //note
}
}
- (void)handleTimer: (NSTimer *) timer
{
whichFrame ++;
[self setNeedsDisplay];
}

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