Key Frame Animation

gistfile1.m

-(IBAction)buttonPress:(id)sender
{
    NSString *keyPath = @"anchorPoint.x";
    CAKeyframeAnimation *kfa = [CAKeyframeAnimation animationWithKeyPath:keyPath];
    [kfa setValues:[NSArray arrayWithObjects:
                    [NSNumber numberWithFloat:-.05],
                    [NSNumber numberWithFloat:.1],
                    [NSNumber numberWithFloat:-.1],
                    [NSNumber numberWithFloat:.1],
                    [NSNumber numberWithFloat:-.05],
                    nil]];
    [kfa setAdditive:YES];
    [kfa setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
    [kfa setDuration:.35];
    [button.layer addAnimation:kfa forKey:nil];
 
}