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- (IBAction)change:(id)sender {

    

    [self.button1 setImage:[UIImage imageNamed:(i%2==0?@"2":@"1")] forState:UIControlStateNormal];

    

    

    self.image1.layer.contents = (id)[UIImage imageNamed:(i%2==0?@"2":@"1")].CGImage;

    CAKeyframeAnimation *k = [CAKeyframeAnimation animationWithKeyPath:@"transform.scale"];

    k.values = @[@(0.1),@(1.0),@(1.5)];

    k.keyTimes = @[@(0.0),@(0.5),@(0.8),@(1.0)];

    k.calculationMode = kCAAnimationLinear;

    i++;

    [self.button1.layer addAnimation:k forKey:@"SHOW"];

    [self.image1.layer addAnimation:k forKey:@"SHOW"];

}