YYImage

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {

CGFloat viewHeight = scrollView.height + scrollView.contentInset.top;

for (YYWebImageExampleCell *cell
in [self.tableView
visibleCells]) {

CGFloat y = cell.centerY - scrollView.contentOffset.y;

CGFloat p = y - viewHeight /
2;

CGFloat scale =
cos(p / viewHeight * 0.8) *
0.95;

if (kiOS8Later) {

[UIView
animateWithDuration:0.15
delay:0
options:UIViewAnimationOptionCurveEaseInOut |
UIViewAnimationOptionAllowUserInteraction |
UIViewAnimationOptionBeginFromCurrentState animations:^{

cell.webImageView.transform =
CGAffineTransformMakeScale(scale, scale);

} completion:NULL];

} else {

cell.webImageView.transform =
CGAffineTransformMakeScale(scale, scale);

}

}

}