- (void)scaleToSmall
{
    NSLog(@"scaletoSmall");
    POPBasicAnimation *scaleAnimation = [POPBasicAnimation animationWithPropertyNamed:kPOPLayerScaleXY];
    scaleAnimation.toValue = [NSValue valueWithCGSize:CGSizeMake(0.95f, 0.95f)];
    [self.layer pop_addAnimation:scaleAnimation forKey:@"layerScaleSmallAnimation"];
}

- (void)scaleAnimation
{
    NSLog(@"scaleAnimation");
    POPSpringAnimation *scaleAnimation = [POPSpringAnimation animationWithPropertyNamed:kPOPLayerScaleXY];
    scaleAnimation.velocity = [NSValue valueWithCGSize:CGSizeMake(6.f, 6.f)];
    scaleAnimation.toValue = [NSValue valueWithCGSize:CGSizeMake(1.f, 1.f)];
    scaleAnimation.springBounciness = 22.0f;
    [self.layer pop_addAnimation:scaleAnimation forKey:@"layerScaleSpringAnimation"];
}

- (void)scaleToDefault
{
    NSLog(@"scaletoDefault");
    POPBasicAnimation *scaleAnimation = [POPBasicAnimation animationWithPropertyNamed:kPOPLayerScaleXY];
    scaleAnimation.toValue = [NSValue valueWithCGSize:CGSizeMake(1.f, 1.f)];
    [self.layer pop_addAnimation:scaleAnimation forKey:@"layerScaleDefaultAnimation"];
}
 

- (UIEdgeInsets)titleEdgeInsets
{
    //top, left, bottom, right
    return UIEdgeInsetsMake(4.f,
                            28.f,
                            4.f,
                            28.f);
}

控制元件的內建大小 --- 由控制元件本身的內容所決定的

- (CGSize)intrinsicContentSize
{
    CGSize s = [super intrinsicContentSize];

    return CGSizeMake(s.width + self.titleEdgeInsets.left + self.titleEdgeInsets.right,
                      s.height + self.titleEdgeInsets.top + self.titleEdgeInsets.bottom);
    
}