The goal of this project is to create a parallax effect on a UIImageView on a UITableViewCell when the table scrolls.
This code has been created originally to provide a parallax effect on meets's discover tab.
Download the app and test it for free! Feedback is welcome!
On your UITableViewCell
- Put the
parallaxImageViewinside aUIViewwithclipsToBounds = YES;with some offest. - Add this function to calculate the image offset when the
UITableViewscrolls.
- (void)cellOnTableView:(UITableView *)tableView didScrollOnView:(UIView *)view
{
CGRect rectInSuperview = [tableView convertRect:self.frame toView:view];
float distanceFromCenter = CGRectGetHeight(view.frame)/2 - CGRectGetMinY(rectInSuperview);
float difference = CGRectGetHeight(self.parallaxImage.frame) - CGRectGetHeight(self.frame);
float move = (distanceFromCenter / CGRectGetHeight(view.frame)) * difference;
CGRect imageRect = self.parallaxImage.frame;
imageRect.origin.y = -(difference/2)+move;
self.parallaxImage.frame = imageRect;
}On your UITableViewDelegate add this function.
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
// Get visible cells on table view.
NSArray *visibleCells = [self.tableView visibleCells];
for (JBParallaxCell *cell in visibleCells) {
[cell cellOnTableView:self.tableView didScrollOnView:self.view];
}
}And that is all, you can use the demo project to see how everithig works together.
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